From c93202258fc01ac847cea2ac3cfcbff764fac517 Mon Sep 17 00:00:00 2001
From: starlord <chxiehust@gmail.com>
Date: Fri, 27 Sep 2019 18:57:46 +0800
Subject: [PATCH] format unittest code

Former-commit-id: f5979db268dc71e79ef556617fb8992dda04a422
---
 cpp/CMakeLists.txt                            |   2 +-
 cpp/build-support/lint_exclusions.txt         |   6 +-
 cpp/build.sh                                  |  31 +-
 cpp/src/db/meta/MetaFactory.cpp               |   5 +-
 cpp/unittest/CMakeLists.txt                   |   2 +
 cpp/unittest/db/db_tests.cpp                  | 331 +++++++++---------
 cpp/unittest/db/engine_test.cpp               |  71 ++--
 cpp/unittest/db/mem_test.cpp                  | 152 ++++----
 cpp/unittest/db/meta_tests.cpp                | 174 ++++-----
 cpp/unittest/db/misc_test.cpp                 |  52 +--
 cpp/unittest/db/mysql_db_test.cpp             | 130 +++----
 cpp/unittest/db/mysql_meta_test.cpp           | 180 +++++-----
 cpp/unittest/db/search_test.cpp               | 182 +++++-----
 cpp/unittest/db/utils.cpp                     | 132 ++++---
 cpp/unittest/db/utils.h                       |  33 +-
 cpp/unittest/main.cpp                         |   6 +-
 cpp/unittest/metrics/metricbase_test.cpp      |  16 +-
 cpp/unittest/metrics/metrics_test.cpp         | 104 +++---
 cpp/unittest/metrics/prometheus_test.cpp      |  21 +-
 cpp/unittest/metrics/utils.cpp                |  34 +-
 cpp/unittest/metrics/utils.h                  |  15 +-
 cpp/unittest/scheduler/algorithm_test.cpp     |   9 +-
 cpp/unittest/scheduler/event_test.cpp         |   6 +-
 cpp/unittest/scheduler/node_test.cpp          |  34 +-
 cpp/unittest/scheduler/normal_test.cpp        |  23 +-
 .../scheduler/resource_factory_test.cpp       |  17 +-
 cpp/unittest/scheduler/resource_mgr_test.cpp  |  15 +-
 cpp/unittest/scheduler/resource_test.cpp      |  27 +-
 cpp/unittest/scheduler/schedinst_test.cpp     |  12 +-
 cpp/unittest/scheduler/scheduler_test.cpp     |  55 ++-
 cpp/unittest/scheduler/task_test.cpp          |   9 +-
 cpp/unittest/scheduler/tasktable_test.cpp     | 181 +++++-----
 cpp/unittest/server/cache_test.cpp            | 116 +++---
 cpp/unittest/server/config_test.cpp           |  50 +--
 cpp/unittest/server/rpc_test.cpp              | 108 +++---
 cpp/unittest/server/util_test.cpp             | 240 +++++++------
 cpp/unittest/wrapper/utils.cpp                |  27 +-
 cpp/unittest/wrapper/utils.h                  |   2 -
 cpp/unittest/wrapper/wrapper_test.cpp         |   2 +-
 cpp/version.h.macro                           |  17 +
 40 files changed, 1353 insertions(+), 1276 deletions(-)

diff --git a/cpp/CMakeLists.txt b/cpp/CMakeLists.txt
index cc807d43ed..d2092eb018 100644
--- a/cpp/CMakeLists.txt
+++ b/cpp/CMakeLists.txt
@@ -189,7 +189,7 @@ add_custom_target(lint
                   --exclude_globs
                   ${LINT_EXCLUSIONS_FILE}
                   --source_dir
-                  ${CMAKE_CURRENT_SOURCE_DIR}/src
+                  ${CMAKE_CURRENT_SOURCE_DIR}
                   ${MILVUS_LINT_QUIET})
 
 #
diff --git a/cpp/build-support/lint_exclusions.txt b/cpp/build-support/lint_exclusions.txt
index 27bd780f42..593ab6b1cf 100644
--- a/cpp/build-support/lint_exclusions.txt
+++ b/cpp/build-support/lint_exclusions.txt
@@ -3,6 +3,10 @@
 *cmake_build*
 *src/thirdparty*
 *src/core/thirdparty*
+*thirdparty*
 *src/grpc*
 *easylogging++*
-*SqliteMetaImpl.cpp
\ No newline at end of file
+*SqliteMetaImpl.cpp
+*src/core*
+*src/wrapper*
+*unittest/wrapper*
\ No newline at end of file
diff --git a/cpp/build.sh b/cpp/build.sh
index 4087db4592..974110c08f 100755
--- a/cpp/build.sh
+++ b/cpp/build.sh
@@ -99,21 +99,26 @@ if [[ ${RUN_CPPLINT} == "ON" ]]; then
     # cpplint check
     make lint
     if [ $? -ne 0 ]; then
-        echo "ERROR! cpplint check not pass"
-        exit 1
-    fi
-    # clang-format check
-    make check-clang-format
-    if [ $? -ne 0 ]; then
-        echo "ERROR! clang-format check failed"
-        exit 1
-    fi
-    # clang-tidy check
-    make check-clang-tidy
-    if [ $? -ne 0 ]; then
-        echo "ERROR! clang-tidy check failed"
+        echo "ERROR! cpplint check failed"
         exit 1
     fi
+    echo "cpplint check pass!"
+
+#    # clang-format check
+#    make check-clang-format
+#    if [ $? -ne 0 ]; then
+#        echo "ERROR! clang-format check failed"
+#        exit 1
+#    fi
+#    echo "clang-format check pass!"
+#
+#    # clang-tidy check
+#    make check-clang-tidy
+#    if [ $? -ne 0 ]; then
+#        echo "ERROR! clang-tidy check failed"
+#        exit 1
+#    fi
+#    echo "clang-tidy check pass!"
 else
     # compile and build
     make -j 4 || exit 1
diff --git a/cpp/src/db/meta/MetaFactory.cpp b/cpp/src/db/meta/MetaFactory.cpp
index dd0b2ae7ea..6a305a4280 100644
--- a/cpp/src/db/meta/MetaFactory.cpp
+++ b/cpp/src/db/meta/MetaFactory.cpp
@@ -40,9 +40,8 @@ MetaFactory::BuildOption(const std::string &path) {
     if (p == "") {
         srand(time(nullptr));
         std::stringstream ss;
-        uint32_t rd = 0;
-        rand_r(&rd);
-        ss << "/tmp/" << rd;
+        uint32_t seed = 1;
+        ss << "/tmp/" << rand_r(&seed);
         p = ss.str();
     }
 
diff --git a/cpp/unittest/CMakeLists.txt b/cpp/unittest/CMakeLists.txt
index 0df8bfd791..0f454ccc43 100644
--- a/cpp/unittest/CMakeLists.txt
+++ b/cpp/unittest/CMakeLists.txt
@@ -118,6 +118,8 @@ set(unittest_libs
         cublas
         )
 
+include_directories(${CMAKE_CURRENT_SOURCE_DIR})
+message(STATUS "CMAKE_CURRENT_SOURCE_DIR=${CMAKE_CURRENT_SOURCE_DIR}")
 foreach(dir ${CORE_INCLUDE_DIRS})
     include_directories(${dir})
 endforeach()
diff --git a/cpp/unittest/db/db_tests.cpp b/cpp/unittest/db/db_tests.cpp
index f2f8121538..365fc3ab2d 100644
--- a/cpp/unittest/db/db_tests.cpp
+++ b/cpp/unittest/db/db_tests.cpp
@@ -15,7 +15,7 @@
 // specific language governing permissions and limitations
 // under the License.
 
-#include "utils.h"
+#include "db/utils.h"
 #include "db/DB.h"
 #include "db/DBImpl.h"
 #include "db/meta/MetaConsts.h"
@@ -28,139 +28,142 @@
 #include <thread>
 #include <random>
 
-using namespace zilliz::milvus;
-
 namespace {
 
-    static const char* TABLE_NAME = "test_group";
-    static constexpr int64_t TABLE_DIM = 256;
-    static constexpr int64_t VECTOR_COUNT = 25000;
-    static constexpr int64_t INSERT_LOOP = 1000;
-    static constexpr int64_t SECONDS_EACH_HOUR = 3600;
-    static constexpr int64_t DAY_SECONDS = 24 * 60 * 60;
+namespace ms = zilliz::milvus;
 
-    engine::meta::TableSchema BuildTableSchema() {
-        engine::meta::TableSchema table_info;
-        table_info.dimension_ = TABLE_DIM;
-        table_info.table_id_ = TABLE_NAME;
-        return table_info;
-    }
-
-    void BuildVectors(int64_t n, std::vector<float>& vectors) {
-        vectors.clear();
-        vectors.resize(n*TABLE_DIM);
-        float* data = vectors.data();
-        for(int i = 0; i < n; i++) {
-            for(int j = 0; j < TABLE_DIM; j++) data[TABLE_DIM * i + j] = drand48();
-            data[TABLE_DIM * i] += i / 2000.;
-        }
-    }
-
-    std::string CurrentTmDate(int64_t offset_day = 0) {
-        time_t tt;
-        time( &tt );
-        tt = tt + 8*SECONDS_EACH_HOUR;
-        tt = tt + 24*SECONDS_EACH_HOUR*offset_day;
-        tm* t= gmtime( &tt );
-
-        std::string str = std::to_string(t->tm_year + 1900) + "-" + std::to_string(t->tm_mon + 1)
-                          + "-" + std::to_string(t->tm_mday);
-
-        return str;
-    }
-
-    void
-    ConvertTimeRangeToDBDates(const std::string &start_value,
-                              const std::string &end_value,
-                              std::vector<engine::meta::DateT > &dates) {
-        dates.clear();
-
-        time_t tt_start, tt_end;
-        tm tm_start, tm_end;
-        if (!zilliz::milvus::server::CommonUtil::TimeStrToTime(start_value, tt_start, tm_start)) {
-            return;
-        }
-
-        if (!zilliz::milvus::server::CommonUtil::TimeStrToTime(end_value, tt_end, tm_end)) {
-            return;
-        }
-
-        long days = (tt_end > tt_start) ? (tt_end - tt_start) / DAY_SECONDS : (tt_start - tt_end) /
-                                                                              DAY_SECONDS;
-        if (days == 0) {
-            return;
-        }
-
-        for (long i = 0; i < days; i++) {
-            time_t tt_day = tt_start + DAY_SECONDS * i;
-            tm tm_day;
-            zilliz::milvus::server::CommonUtil::ConvertTime(tt_day, tm_day);
-
-            long date = tm_day.tm_year * 10000 + tm_day.tm_mon * 100 +
-                        tm_day.tm_mday;//according to db logic
-            dates.push_back(date);
-        }
-    }
+static const char *TABLE_NAME = "test_group";
+static constexpr int64_t TABLE_DIM = 256;
+static constexpr int64_t VECTOR_COUNT = 25000;
+static constexpr int64_t INSERT_LOOP = 1000;
+static constexpr int64_t SECONDS_EACH_HOUR = 3600;
+static constexpr int64_t DAY_SECONDS = 24 * 60 * 60;
 
+ms::engine::meta::TableSchema
+BuildTableSchema() {
+    ms::engine::meta::TableSchema table_info;
+    table_info.dimension_ = TABLE_DIM;
+    table_info.table_id_ = TABLE_NAME;
+    return table_info;
 }
 
+void
+BuildVectors(int64_t n, std::vector<float> &vectors) {
+    vectors.clear();
+    vectors.resize(n * TABLE_DIM);
+    float *data = vectors.data();
+    for (int i = 0; i < n; i++) {
+        for (int j = 0; j < TABLE_DIM; j++) data[TABLE_DIM * i + j] = drand48();
+        data[TABLE_DIM * i] += i / 2000.;
+    }
+}
+
+std::string
+CurrentTmDate(int64_t offset_day = 0) {
+    time_t tt;
+    time(&tt);
+    tt = tt + 8 * SECONDS_EACH_HOUR;
+    tt = tt + 24 * SECONDS_EACH_HOUR * offset_day;
+    tm t;
+    gmtime_r(&tt, &t);
+
+    std::string str = std::to_string(t.tm_year + 1900) + "-" + std::to_string(t.tm_mon + 1)
+        + "-" + std::to_string(t.tm_mday);
+
+    return str;
+}
+
+void
+ConvertTimeRangeToDBDates(const std::string &start_value,
+                          const std::string &end_value,
+                          std::vector<ms::engine::meta::DateT> &dates) {
+    dates.clear();
+
+    time_t tt_start, tt_end;
+    tm tm_start, tm_end;
+    if (!zilliz::milvus::server::CommonUtil::TimeStrToTime(start_value, tt_start, tm_start)) {
+        return;
+    }
+
+    if (!zilliz::milvus::server::CommonUtil::TimeStrToTime(end_value, tt_end, tm_end)) {
+        return;
+    }
+
+    int64_t days = (tt_end > tt_start) ? (tt_end - tt_start) / DAY_SECONDS : (tt_start - tt_end) /
+        DAY_SECONDS;
+    if (days == 0) {
+        return;
+    }
+
+    for (int64_t i = 0; i < days; i++) {
+        time_t tt_day = tt_start + DAY_SECONDS * i;
+        tm tm_day;
+        zilliz::milvus::server::CommonUtil::ConvertTime(tt_day, tm_day);
+
+        int64_t date = tm_day.tm_year * 10000 + tm_day.tm_mon * 100 +
+            tm_day.tm_mday;//according to db logic
+        dates.push_back(date);
+    }
+}
+
+} // namespace
+
 TEST_F(DBTest, CONFIG_TEST) {
     {
-        ASSERT_ANY_THROW(engine::ArchiveConf conf("wrong"));
+        ASSERT_ANY_THROW(ms::engine::ArchiveConf conf("wrong"));
         /* EXPECT_DEATH(engine::ArchiveConf conf("wrong"), ""); */
     }
     {
-        engine::ArchiveConf conf("delete");
+        ms::engine::ArchiveConf conf("delete");
         ASSERT_EQ(conf.GetType(), "delete");
         auto criterias = conf.GetCriterias();
-        ASSERT_TRUE(criterias.size() == 0);
+        ASSERT_EQ(criterias.size(), 0);
     }
     {
-        engine::ArchiveConf conf("swap");
+        ms::engine::ArchiveConf conf("swap");
         ASSERT_EQ(conf.GetType(), "swap");
         auto criterias = conf.GetCriterias();
-        ASSERT_TRUE(criterias.size() == 0);
+        ASSERT_EQ(criterias.size(), 0);
     }
     {
-        ASSERT_ANY_THROW(engine::ArchiveConf conf1("swap", "disk:"));
-        ASSERT_ANY_THROW(engine::ArchiveConf conf2("swap", "disk:a"));
-        engine::ArchiveConf conf("swap", "disk:1024");
+        ASSERT_ANY_THROW(ms::engine::ArchiveConf conf1("swap", "disk:"));
+        ASSERT_ANY_THROW(ms::engine::ArchiveConf conf2("swap", "disk:a"));
+        ms::engine::ArchiveConf conf("swap", "disk:1024");
         auto criterias = conf.GetCriterias();
-        ASSERT_TRUE(criterias.size() == 1);
-        ASSERT_TRUE(criterias["disk"] == 1024);
+        ASSERT_EQ(criterias.size(), 1);
+        ASSERT_EQ(criterias["disk"], 1024);
     }
     {
-        ASSERT_ANY_THROW(engine::ArchiveConf conf1("swap", "days:"));
-        ASSERT_ANY_THROW(engine::ArchiveConf conf2("swap", "days:a"));
-        engine::ArchiveConf conf("swap", "days:100");
+        ASSERT_ANY_THROW(ms::engine::ArchiveConf conf1("swap", "days:"));
+        ASSERT_ANY_THROW(ms::engine::ArchiveConf conf2("swap", "days:a"));
+        ms::engine::ArchiveConf conf("swap", "days:100");
         auto criterias = conf.GetCriterias();
-        ASSERT_TRUE(criterias.size() == 1);
-        ASSERT_TRUE(criterias["days"] == 100);
+        ASSERT_EQ(criterias.size(), 1);
+        ASSERT_EQ(criterias["days"], 100);
     }
     {
-        ASSERT_ANY_THROW(engine::ArchiveConf conf1("swap", "days:"));
-        ASSERT_ANY_THROW(engine::ArchiveConf conf2("swap", "days:a"));
-        engine::ArchiveConf conf("swap", "days:100;disk:200");
+        ASSERT_ANY_THROW(ms::engine::ArchiveConf conf1("swap", "days:"));
+        ASSERT_ANY_THROW(ms::engine::ArchiveConf conf2("swap", "days:a"));
+        ms::engine::ArchiveConf conf("swap", "days:100;disk:200");
         auto criterias = conf.GetCriterias();
-        ASSERT_TRUE(criterias.size() == 2);
-        ASSERT_TRUE(criterias["days"] == 100);
-        ASSERT_TRUE(criterias["disk"] == 200);
+        ASSERT_EQ(criterias.size(), 2);
+        ASSERT_EQ(criterias["days"], 100);
+        ASSERT_EQ(criterias["disk"], 200);
     }
 }
 
-
 TEST_F(DBTest, DB_TEST) {
-    engine::meta::TableSchema table_info = BuildTableSchema();
+    ms::engine::meta::TableSchema table_info = BuildTableSchema();
     auto stat = db_->CreateTable(table_info);
 
-    engine::meta::TableSchema table_info_get;
+    ms::engine::meta::TableSchema table_info_get;
     table_info_get.table_id_ = TABLE_NAME;
     stat = db_->DescribeTable(table_info_get);
     ASSERT_TRUE(stat.ok());
     ASSERT_EQ(table_info_get.dimension_, TABLE_DIM);
 
-    engine::IDNumbers vector_ids;
-    engine::IDNumbers target_ids;
+    ms::engine::IDNumbers vector_ids;
+    ms::engine::IDNumbers target_ids;
 
     int64_t nb = 50;
     std::vector<float> xb;
@@ -171,7 +174,7 @@ TEST_F(DBTest, DB_TEST) {
     BuildVectors(qb, qxb);
 
     std::thread search([&]() {
-        engine::QueryResults results;
+        ms::engine::QueryResults results;
         int k = 10;
         std::this_thread::sleep_for(std::chrono::seconds(2));
 
@@ -180,18 +183,18 @@ TEST_F(DBTest, DB_TEST) {
         uint64_t count = 0;
         uint64_t prev_count = 0;
 
-        for (auto j=0; j<10; ++j) {
+        for (auto j = 0; j < 10; ++j) {
             ss.str("");
             db_->Size(count);
             prev_count = count;
 
             START_TIMER;
             stat = db_->Query(TABLE_NAME, k, qb, 10, qxb.data(), results);
-            ss << "Search " << j << " With Size " << count/engine::meta::M << " M";
+            ss << "Search " << j << " With Size " << count / ms::engine::meta::M << " M";
             STOP_TIMER(ss.str());
 
             ASSERT_TRUE(stat.ok());
-            for (auto k=0; k<qb; ++k) {
+            for (auto k = 0; k < qb; ++k) {
                 ASSERT_EQ(results[k][0].first, target_ids[k]);
                 ss.str("");
                 ss << "Result [" << k << "]:";
@@ -207,8 +210,8 @@ TEST_F(DBTest, DB_TEST) {
 
     int loop = INSERT_LOOP;
 
-    for (auto i=0; i<loop; ++i) {
-        if (i==40) {
+    for (auto i = 0; i < loop; ++i) {
+        if (i == 40) {
             db_->InsertVectors(TABLE_NAME, qb, qxb.data(), target_ids);
             ASSERT_EQ(target_ids.size(), qb);
         } else {
@@ -222,14 +225,14 @@ TEST_F(DBTest, DB_TEST) {
     uint64_t count;
     stat = db_->GetTableRowCount(TABLE_NAME, count);
     ASSERT_TRUE(stat.ok());
-    ASSERT_TRUE(count > 0);
-};
+    ASSERT_GT(count, 0);
+}
 
 TEST_F(DBTest, SEARCH_TEST) {
-    engine::meta::TableSchema table_info = BuildTableSchema();
+    ms::engine::meta::TableSchema table_info = BuildTableSchema();
     auto stat = db_->CreateTable(table_info);
 
-    engine::meta::TableSchema table_info_get;
+    ms::engine::meta::TableSchema table_info_get;
     table_info_get.table_id_ = TABLE_NAME;
     stat = db_->DescribeTable(table_info_get);
     ASSERT_TRUE(stat.ok());
@@ -239,63 +242,63 @@ TEST_F(DBTest, SEARCH_TEST) {
     size_t nb = VECTOR_COUNT;
     size_t nq = 10;
     size_t k = 5;
-    std::vector<float> xb(nb*TABLE_DIM);
-    std::vector<float> xq(nq*TABLE_DIM);
-    std::vector<long> ids(nb);
+    std::vector<float> xb(nb * TABLE_DIM);
+    std::vector<float> xq(nq * TABLE_DIM);
+    std::vector<int64_t> ids(nb);
 
     std::random_device rd;
     std::mt19937 gen(rd());
     std::uniform_real_distribution<> dis_xt(-1.0, 1.0);
-    for (size_t i = 0; i < nb*TABLE_DIM; i++) {
+    for (size_t i = 0; i < nb * TABLE_DIM; i++) {
         xb[i] = dis_xt(gen);
-        if (i < nb){
+        if (i < nb) {
             ids[i] = i;
         }
     }
-    for (size_t i = 0; i < nq*TABLE_DIM; i++) {
+    for (size_t i = 0; i < nq * TABLE_DIM; i++) {
         xq[i] = dis_xt(gen);
     }
 
     // result data
     //std::vector<long> nns_gt(k*nq);
-    std::vector<long> nns(k*nq);  // nns = nearst neg search
+    std::vector<int64_t> nns(k * nq);  // nns = nearst neg search
     //std::vector<float> dis_gt(k*nq);
-    std::vector<float> dis(k*nq);
+    std::vector<float> dis(k * nq);
 
     // insert data
     const int batch_size = 100;
     for (int j = 0; j < nb / batch_size; ++j) {
-        stat = db_->InsertVectors(TABLE_NAME, batch_size, xb.data()+batch_size*j*TABLE_DIM, ids);
-        if (j == 200){ sleep(1);}
+        stat = db_->InsertVectors(TABLE_NAME, batch_size, xb.data() + batch_size * j * TABLE_DIM, ids);
+        if (j == 200) { sleep(1); }
         ASSERT_TRUE(stat.ok());
     }
 
-    engine::TableIndex index;
-    index.engine_type_ = (int)engine::EngineType::FAISS_IDMAP;
+    ms::engine::TableIndex index;
+    index.engine_type_ = (int) ms::engine::EngineType::FAISS_IDMAP;
     db_->CreateIndex(TABLE_NAME, index); // wait until build index finish
 
     {
-        engine::QueryResults results;
+        ms::engine::QueryResults results;
         stat = db_->Query(TABLE_NAME, k, nq, 10, xq.data(), results);
         ASSERT_TRUE(stat.ok());
     }
 
     {//search by specify index file
-        engine::meta::DatesT dates;
+        ms::engine::meta::DatesT dates;
         std::vector<std::string> file_ids = {"1", "2", "3", "4", "5", "6"};
-        engine::QueryResults results;
+        ms::engine::QueryResults results;
         stat = db_->Query(TABLE_NAME, file_ids, k, nq, 10, xq.data(), dates, results);
         ASSERT_TRUE(stat.ok());
     }
 
     // TODO(linxj): add groundTruth assert
-};
+}
 
 TEST_F(DBTest, PRELOADTABLE_TEST) {
-    engine::meta::TableSchema table_info = BuildTableSchema();
+    ms::engine::meta::TableSchema table_info = BuildTableSchema();
     auto stat = db_->CreateTable(table_info);
 
-    engine::meta::TableSchema table_info_get;
+    ms::engine::meta::TableSchema table_info_get;
     table_info_get.table_id_ = TABLE_NAME;
     stat = db_->DescribeTable(table_info_get);
     ASSERT_TRUE(stat.ok());
@@ -306,28 +309,27 @@ TEST_F(DBTest, PRELOADTABLE_TEST) {
     BuildVectors(nb, xb);
 
     int loop = 5;
-    for (auto i=0; i<loop; ++i) {
-        engine::IDNumbers vector_ids;
+    for (auto i = 0; i < loop; ++i) {
+        ms::engine::IDNumbers vector_ids;
         db_->InsertVectors(TABLE_NAME, nb, xb.data(), vector_ids);
         ASSERT_EQ(vector_ids.size(), nb);
     }
 
-    engine::TableIndex index;
-    index.engine_type_ = (int)engine::EngineType::FAISS_IDMAP;
+    ms::engine::TableIndex index;
+    index.engine_type_ = (int) ms::engine::EngineType::FAISS_IDMAP;
     db_->CreateIndex(TABLE_NAME, index); // wait until build index finish
 
-    int64_t prev_cache_usage = cache::CpuCacheMgr::GetInstance()->CacheUsage();
+    int64_t prev_cache_usage = ms::cache::CpuCacheMgr::GetInstance()->CacheUsage();
     stat = db_->PreloadTable(TABLE_NAME);
     ASSERT_TRUE(stat.ok());
-    int64_t cur_cache_usage = cache::CpuCacheMgr::GetInstance()->CacheUsage();
+    int64_t cur_cache_usage = ms::cache::CpuCacheMgr::GetInstance()->CacheUsage();
     ASSERT_TRUE(prev_cache_usage < cur_cache_usage);
-
 }
 
 TEST_F(DBTest, SHUTDOWN_TEST) {
     db_->Stop();
 
-    engine::meta::TableSchema table_info = BuildTableSchema();
+    ms::engine::meta::TableSchema table_info = BuildTableSchema();
     auto stat = db_->CreateTable(table_info);
     ASSERT_FALSE(stat.ok());
 
@@ -338,7 +340,7 @@ TEST_F(DBTest, SHUTDOWN_TEST) {
     stat = db_->HasTable(table_info.table_id_, has_table);
     ASSERT_FALSE(stat.ok());
 
-    engine::IDNumbers ids;
+    ms::engine::IDNumbers ids;
     stat = db_->InsertVectors(table_info.table_id_, 0, nullptr, ids);
     ASSERT_FALSE(stat.ok());
 
@@ -349,15 +351,15 @@ TEST_F(DBTest, SHUTDOWN_TEST) {
     stat = db_->GetTableRowCount(table_info.table_id_, row_count);
     ASSERT_FALSE(stat.ok());
 
-    engine::TableIndex index;
+    ms::engine::TableIndex index;
     stat = db_->CreateIndex(table_info.table_id_, index);
     ASSERT_FALSE(stat.ok());
 
     stat = db_->DescribeIndex(table_info.table_id_, index);
     ASSERT_FALSE(stat.ok());
 
-    engine::meta::DatesT dates;
-    engine::QueryResults results;
+    ms::engine::meta::DatesT dates;
+    ms::engine::QueryResults results;
     stat = db_->Query(table_info.table_id_, 1, 1, 1, nullptr, dates, results);
     ASSERT_FALSE(stat.ok());
     std::vector<std::string> file_ids;
@@ -369,24 +371,24 @@ TEST_F(DBTest, SHUTDOWN_TEST) {
 }
 
 TEST_F(DBTest, INDEX_TEST) {
-    engine::meta::TableSchema table_info = BuildTableSchema();
+    ms::engine::meta::TableSchema table_info = BuildTableSchema();
     auto stat = db_->CreateTable(table_info);
 
     int64_t nb = VECTOR_COUNT;
     std::vector<float> xb;
     BuildVectors(nb, xb);
 
-    engine::IDNumbers vector_ids;
+    ms::engine::IDNumbers vector_ids;
     db_->InsertVectors(TABLE_NAME, nb, xb.data(), vector_ids);
     ASSERT_EQ(vector_ids.size(), nb);
 
-    engine::TableIndex index;
-    index.engine_type_ = (int)engine::EngineType::FAISS_IVFSQ8;
-    index.metric_type_ = (int)engine::MetricType::IP;
+    ms::engine::TableIndex index;
+    index.engine_type_ = (int) ms::engine::EngineType::FAISS_IVFSQ8;
+    index.metric_type_ = (int) ms::engine::MetricType::IP;
     stat = db_->CreateIndex(table_info.table_id_, index);
     ASSERT_TRUE(stat.ok());
 
-    engine::TableIndex index_out;
+    ms::engine::TableIndex index_out;
     stat = db_->DescribeIndex(table_info.table_id_, index_out);
     ASSERT_TRUE(stat.ok());
     ASSERT_EQ(index.engine_type_, index_out.engine_type_);
@@ -398,23 +400,22 @@ TEST_F(DBTest, INDEX_TEST) {
 }
 
 TEST_F(DBTest2, ARHIVE_DISK_CHECK) {
-
-    engine::meta::TableSchema table_info = BuildTableSchema();
+    ms::engine::meta::TableSchema table_info = BuildTableSchema();
     auto stat = db_->CreateTable(table_info);
 
-    std::vector<engine::meta::TableSchema> table_schema_array;
+    std::vector<ms::engine::meta::TableSchema> table_schema_array;
     stat = db_->AllTables(table_schema_array);
     ASSERT_TRUE(stat.ok());
     bool bfound = false;
-    for(auto& schema : table_schema_array) {
-        if(schema.table_id_ == TABLE_NAME) {
+    for (auto &schema : table_schema_array) {
+        if (schema.table_id_ == TABLE_NAME) {
             bfound = true;
             break;
         }
     }
     ASSERT_TRUE(bfound);
 
-    engine::meta::TableSchema table_info_get;
+    ms::engine::meta::TableSchema table_info_get;
     table_info_get.table_id_ = TABLE_NAME;
     stat = db_->DescribeTable(table_info_get);
     ASSERT_TRUE(stat.ok());
@@ -428,8 +429,8 @@ TEST_F(DBTest2, ARHIVE_DISK_CHECK) {
     BuildVectors(nb, xb);
 
     int loop = INSERT_LOOP;
-    for (auto i=0; i<loop; ++i) {
-        engine::IDNumbers vector_ids;
+    for (auto i = 0; i < loop; ++i) {
+        ms::engine::IDNumbers vector_ids;
         db_->InsertVectors(TABLE_NAME, nb, xb.data(), vector_ids);
         std::this_thread::sleep_for(std::chrono::microseconds(1));
     }
@@ -438,14 +439,14 @@ TEST_F(DBTest2, ARHIVE_DISK_CHECK) {
 
     db_->Size(size);
     LOG(DEBUG) << "size=" << size;
-    ASSERT_LE(size, 1 * engine::meta::G);
-};
+    ASSERT_LE(size, 1 * ms::engine::meta::G);
+}
 
 TEST_F(DBTest2, DELETE_TEST) {
-    engine::meta::TableSchema table_info = BuildTableSchema();
+    ms::engine::meta::TableSchema table_info = BuildTableSchema();
     auto stat = db_->CreateTable(table_info);
 
-    engine::meta::TableSchema table_info_get;
+    ms::engine::meta::TableSchema table_info_get;
     table_info_get.table_id_ = TABLE_NAME;
     stat = db_->DescribeTable(table_info_get);
     ASSERT_TRUE(stat.ok());
@@ -461,25 +462,25 @@ TEST_F(DBTest2, DELETE_TEST) {
     std::vector<float> xb;
     BuildVectors(nb, xb);
 
-    engine::IDNumbers vector_ids;
+    ms::engine::IDNumbers vector_ids;
     stat = db_->InsertVectors(TABLE_NAME, nb, xb.data(), vector_ids);
-    engine::TableIndex index;
+    ms::engine::TableIndex index;
     stat = db_->CreateIndex(TABLE_NAME, index);
 
-    std::vector<engine::meta::DateT> dates;
+    std::vector<ms::engine::meta::DateT> dates;
     stat = db_->DeleteTable(TABLE_NAME, dates);
     std::this_thread::sleep_for(std::chrono::seconds(2));
     ASSERT_TRUE(stat.ok());
 
     db_->HasTable(TABLE_NAME, has_table);
     ASSERT_FALSE(has_table);
-};
+}
 
 TEST_F(DBTest2, DELETE_BY_RANGE_TEST) {
-    engine::meta::TableSchema table_info = BuildTableSchema();
+    ms::engine::meta::TableSchema table_info = BuildTableSchema();
     auto stat = db_->CreateTable(table_info);
 
-    engine::meta::TableSchema table_info_get;
+    ms::engine::meta::TableSchema table_info_get;
     table_info_get.table_id_ = TABLE_NAME;
     stat = db_->DescribeTable(table_info_get);
     ASSERT_TRUE(stat.ok());
@@ -496,15 +497,15 @@ TEST_F(DBTest2, DELETE_BY_RANGE_TEST) {
     std::vector<float> xb;
     BuildVectors(nb, xb);
 
-    engine::IDNumbers vector_ids;
+    ms::engine::IDNumbers vector_ids;
     stat = db_->InsertVectors(TABLE_NAME, nb, xb.data(), vector_ids);
-    engine::TableIndex index;
+    ms::engine::TableIndex index;
     stat = db_->CreateIndex(TABLE_NAME, index);
 
     db_->Size(size);
     ASSERT_NE(size, 0UL);
 
-    std::vector<engine::meta::DateT> dates;
+    std::vector<ms::engine::meta::DateT> dates;
     std::string start_value = CurrentTmDate();
     std::string end_value = CurrentTmDate(1);
     ConvertTimeRangeToDBDates(start_value, end_value, dates);
@@ -515,4 +516,4 @@ TEST_F(DBTest2, DELETE_BY_RANGE_TEST) {
     uint64_t row_count = 0;
     db_->GetTableRowCount(TABLE_NAME, row_count);
     ASSERT_EQ(row_count, 0UL);
-}
\ No newline at end of file
+}
diff --git a/cpp/unittest/db/engine_test.cpp b/cpp/unittest/db/engine_test.cpp
index f55d8d9e27..517b2fd506 100644
--- a/cpp/unittest/db/engine_test.cpp
+++ b/cpp/unittest/db/engine_test.cpp
@@ -21,67 +21,66 @@
 
 #include "db/engine/EngineFactory.h"
 #include "db/engine/ExecutionEngineImpl.h"
-#include "utils.h"
+#include "db/utils.h"
 
-using namespace zilliz::milvus;
+namespace {
+
+namespace ms = zilliz::milvus;
+
+}
 
 TEST_F(EngineTest, FACTORY_TEST) {
     {
-        auto engine_ptr = engine::EngineFactory::Build(
+        auto engine_ptr = ms::engine::EngineFactory::Build(
                 512,
                 "/tmp/milvus_index_1",
-                engine::EngineType::INVALID,
-                engine::MetricType::IP,
-                1024
-        );
+                ms::engine::EngineType::INVALID,
+                ms::engine::MetricType::IP,
+                1024);
 
         ASSERT_TRUE(engine_ptr == nullptr);
     }
 
     {
-        auto engine_ptr = engine::EngineFactory::Build(
+        auto engine_ptr = ms::engine::EngineFactory::Build(
                 512,
                 "/tmp/milvus_index_1",
-                engine::EngineType::FAISS_IDMAP,
-                engine::MetricType::IP,
-                1024
-        );
+                ms::engine::EngineType::FAISS_IDMAP,
+                ms::engine::MetricType::IP,
+                1024);
 
         ASSERT_TRUE(engine_ptr != nullptr);
     }
 
     {
-        auto engine_ptr = engine::EngineFactory::Build(
+        auto engine_ptr = ms::engine::EngineFactory::Build(
                 512,
                 "/tmp/milvus_index_1",
-                engine::EngineType::FAISS_IVFFLAT,
-                engine::MetricType::IP,
-                1024
-        );
+                ms::engine::EngineType::FAISS_IVFFLAT,
+                ms::engine::MetricType::IP,
+                1024);
 
         ASSERT_TRUE(engine_ptr != nullptr);
     }
 
     {
-        auto engine_ptr = engine::EngineFactory::Build(
+        auto engine_ptr = ms::engine::EngineFactory::Build(
                 512,
                 "/tmp/milvus_index_1",
-                engine::EngineType::FAISS_IVFSQ8,
-                engine::MetricType::IP,
-                1024
-        );
+                ms::engine::EngineType::FAISS_IVFSQ8,
+                ms::engine::MetricType::IP,
+                1024);
 
         ASSERT_TRUE(engine_ptr != nullptr);
     }
 
     {
-        auto engine_ptr = engine::EngineFactory::Build(
+        auto engine_ptr = ms::engine::EngineFactory::Build(
                 512,
                 "/tmp/milvus_index_1",
-                engine::EngineType::NSG_MIX,
-                engine::MetricType::IP,
-                1024
-        );
+                ms::engine::EngineType::NSG_MIX,
+                ms::engine::MetricType::IP,
+                1024);
 
         ASSERT_TRUE(engine_ptr != nullptr);
     }
@@ -90,27 +89,26 @@ TEST_F(EngineTest, FACTORY_TEST) {
 TEST_F(EngineTest, ENGINE_IMPL_TEST) {
     uint16_t dimension = 64;
     std::string file_path = "/tmp/milvus_index_1";
-    auto engine_ptr = engine::EngineFactory::Build(
+    auto engine_ptr = ms::engine::EngineFactory::Build(
             dimension,
             file_path,
-            engine::EngineType::FAISS_IVFFLAT,
-            engine::MetricType::IP,
-            1024
-    );
+            ms::engine::EngineType::FAISS_IVFFLAT,
+            ms::engine::MetricType::IP,
+            1024);
 
     std::vector<float> data;
-    std::vector<long> ids;
+    std::vector<int64_t> ids;
     const int row_count = 10000;
     data.reserve(row_count*dimension);
     ids.reserve(row_count);
-    for(long i = 0; i < row_count; i++) {
+    for (int64_t i = 0; i < row_count; i++) {
         ids.push_back(i);
-        for(uint16_t k = 0; k < dimension; k++) {
+        for (uint16_t k = 0; k < dimension; k++) {
             data.push_back(i*dimension + k);
         }
     }
 
-    auto status = engine_ptr->AddWithIds((long)ids.size(), data.data(), ids.data());
+    auto status = engine_ptr->AddWithIds((int64_t)ids.size(), data.data(), ids.data());
     ASSERT_TRUE(status.ok());
 
     ASSERT_EQ(engine_ptr->Dimension(), dimension);
@@ -127,5 +125,4 @@ TEST_F(EngineTest, ENGINE_IMPL_TEST) {
 //
 //    auto engine_build = new_engine->BuildIndex("/tmp/milvus_index_2", engine::EngineType::FAISS_IVFSQ8);
 //    //ASSERT_TRUE(status.ok());
-
 }
diff --git a/cpp/unittest/db/mem_test.cpp b/cpp/unittest/db/mem_test.cpp
index b85718a865..93500acce7 100644
--- a/cpp/unittest/db/mem_test.cpp
+++ b/cpp/unittest/db/mem_test.cpp
@@ -25,7 +25,7 @@
 #include "db/engine/EngineFactory.h"
 #include "db/meta/MetaConsts.h"
 #include "metrics/Metrics.h"
-#include "utils.h"
+#include "db/utils.h"
 
 #include <boost/filesystem.hpp>
 #include <thread>
@@ -35,30 +35,32 @@
 #include <random>
 #include <chrono>
 
-using namespace zilliz::milvus;
-
 namespace {
 
-static std::string TABLE_NAME = "test_group";
+namespace ms = zilliz::milvus;
+
 static constexpr int64_t TABLE_DIM = 256;
 
-std::string GenTableName() {
+std::string
+GetTableName() {
     auto now = std::chrono::system_clock::now();
     auto micros = std::chrono::duration_cast<std::chrono::microseconds>(
-            now.time_since_epoch()).count();
-    TABLE_NAME = std::to_string(micros);
-    return TABLE_NAME;
+        now.time_since_epoch()).count();
+    static std::string table_name = std::to_string(micros);
+    return table_name;
 }
 
-engine::meta::TableSchema BuildTableSchema() {
-    engine::meta::TableSchema table_info;
+ms::engine::meta::TableSchema
+BuildTableSchema() {
+    ms::engine::meta::TableSchema table_info;
     table_info.dimension_ = TABLE_DIM;
-    table_info.table_id_ = GenTableName();
-    table_info.engine_type_ = (int) engine::EngineType::FAISS_IDMAP;
+    table_info.table_id_ = GetTableName();
+    table_info.engine_type_ = (int) ms::engine::EngineType::FAISS_IDMAP;
     return table_info;
 }
 
-void BuildVectors(int64_t n, std::vector<float> &vectors) {
+void
+BuildVectors(int64_t n, std::vector<float> &vectors) {
     vectors.clear();
     vectors.resize(n * TABLE_DIM);
     float *data = vectors.data();
@@ -67,15 +69,15 @@ void BuildVectors(int64_t n, std::vector<float> &vectors) {
             data[TABLE_DIM * i + j] = drand48();
     }
 }
-}
+} // namespace
 
 TEST_F(MemManagerTest, VECTOR_SOURCE_TEST) {
-    engine::meta::TableSchema table_schema = BuildTableSchema();
+    ms::engine::meta::TableSchema table_schema = BuildTableSchema();
     auto status = impl_->CreateTable(table_schema);
     ASSERT_TRUE(status.ok());
 
-    engine::meta::TableFileSchema table_file_schema;
-    table_file_schema.table_id_ = TABLE_NAME;
+    ms::engine::meta::TableFileSchema table_file_schema;
+    table_file_schema.table_id_ = GetTableName();
     status = impl_->CreateTableFile(table_file_schema);
     ASSERT_TRUE(status.ok());
 
@@ -83,17 +85,17 @@ TEST_F(MemManagerTest, VECTOR_SOURCE_TEST) {
     std::vector<float> vectors;
     BuildVectors(n, vectors);
 
-    engine::VectorSource source(n, vectors.data());
+    ms::engine::VectorSource source(n, vectors.data());
 
     size_t num_vectors_added;
-    engine::ExecutionEnginePtr execution_engine_ =
-            engine::EngineFactory::Build(table_file_schema.dimension_,
-                    table_file_schema.location_,
-                    (engine::EngineType) table_file_schema.engine_type_,
-                    (engine::MetricType)table_file_schema.metric_type_,
-                    table_schema.nlist_);
+    ms::engine::ExecutionEnginePtr execution_engine_ =
+        ms::engine::EngineFactory::Build(table_file_schema.dimension_,
+                                         table_file_schema.location_,
+                                         (ms::engine::EngineType) table_file_schema.engine_type_,
+                                         (ms::engine::MetricType) table_file_schema.metric_type_,
+                                         table_schema.nlist_);
 
-    engine::IDNumbers vector_ids;
+    ms::engine::IDNumbers vector_ids;
     status = source.Add(execution_engine_, table_file_schema, 50, num_vectors_added, vector_ids);
     ASSERT_TRUE(status.ok());
     vector_ids = source.GetVectorIds();
@@ -113,19 +115,19 @@ TEST_F(MemManagerTest, VECTOR_SOURCE_TEST) {
 TEST_F(MemManagerTest, MEM_TABLE_FILE_TEST) {
     auto options = GetOptions();
 
-    engine::meta::TableSchema table_schema = BuildTableSchema();
+    ms::engine::meta::TableSchema table_schema = BuildTableSchema();
     auto status = impl_->CreateTable(table_schema);
     ASSERT_TRUE(status.ok());
 
-    engine::MemTableFile mem_table_file(TABLE_NAME, impl_, options);
+    ms::engine::MemTableFile mem_table_file(GetTableName(), impl_, options);
 
     int64_t n_100 = 100;
     std::vector<float> vectors_100;
     BuildVectors(n_100, vectors_100);
 
-    engine::VectorSourcePtr source = std::make_shared<engine::VectorSource>(n_100, vectors_100.data());
+    ms::engine::VectorSourcePtr source = std::make_shared<ms::engine::VectorSource>(n_100, vectors_100.data());
 
-    engine::IDNumbers vector_ids;
+    ms::engine::IDNumbers vector_ids;
     status = mem_table_file.Add(source, vector_ids);
     ASSERT_TRUE(status.ok());
 
@@ -137,11 +139,11 @@ TEST_F(MemManagerTest, MEM_TABLE_FILE_TEST) {
     size_t singleVectorMem = sizeof(float) * TABLE_DIM;
     ASSERT_EQ(mem_table_file.GetCurrentMem(), n_100 * singleVectorMem);
 
-    int64_t n_max = engine::MAX_TABLE_FILE_MEM / singleVectorMem;
+    int64_t n_max = ms::engine::MAX_TABLE_FILE_MEM / singleVectorMem;
     std::vector<float> vectors_128M;
     BuildVectors(n_max, vectors_128M);
 
-    engine::VectorSourcePtr source_128M = std::make_shared<engine::VectorSource>(n_max, vectors_128M.data());
+    ms::engine::VectorSourcePtr source_128M = std::make_shared<ms::engine::VectorSource>(n_max, vectors_128M.data());
     vector_ids.clear();
     status = mem_table_file.Add(source_128M, vector_ids);
 
@@ -154,7 +156,7 @@ TEST_F(MemManagerTest, MEM_TABLE_FILE_TEST) {
 TEST_F(MemManagerTest, MEM_TABLE_TEST) {
     auto options = GetOptions();
 
-    engine::meta::TableSchema table_schema = BuildTableSchema();
+    ms::engine::meta::TableSchema table_schema = BuildTableSchema();
     auto status = impl_->CreateTable(table_schema);
     ASSERT_TRUE(status.ok());
 
@@ -162,27 +164,27 @@ TEST_F(MemManagerTest, MEM_TABLE_TEST) {
     std::vector<float> vectors_100;
     BuildVectors(n_100, vectors_100);
 
-    engine::VectorSourcePtr source_100 = std::make_shared<engine::VectorSource>(n_100, vectors_100.data());
+    ms::engine::VectorSourcePtr source_100 = std::make_shared<ms::engine::VectorSource>(n_100, vectors_100.data());
 
-    engine::MemTable mem_table(TABLE_NAME, impl_, options);
+    ms::engine::MemTable mem_table(GetTableName(), impl_, options);
 
-    engine::IDNumbers vector_ids;
+    ms::engine::IDNumbers vector_ids;
     status = mem_table.Add(source_100, vector_ids);
     ASSERT_TRUE(status.ok());
     vector_ids = source_100->GetVectorIds();
     ASSERT_EQ(vector_ids.size(), 100);
 
-    engine::MemTableFilePtr mem_table_file;
+    ms::engine::MemTableFilePtr mem_table_file;
     mem_table.GetCurrentMemTableFile(mem_table_file);
     size_t singleVectorMem = sizeof(float) * TABLE_DIM;
     ASSERT_EQ(mem_table_file->GetCurrentMem(), n_100 * singleVectorMem);
 
-    int64_t n_max = engine::MAX_TABLE_FILE_MEM / singleVectorMem;
+    int64_t n_max = ms::engine::MAX_TABLE_FILE_MEM / singleVectorMem;
     std::vector<float> vectors_128M;
     BuildVectors(n_max, vectors_128M);
 
     vector_ids.clear();
-    engine::VectorSourcePtr source_128M = std::make_shared<engine::VectorSource>(n_max, vectors_128M.data());
+    ms::engine::VectorSourcePtr source_128M = std::make_shared<ms::engine::VectorSource>(n_max, vectors_128M.data());
     status = mem_table.Add(source_128M, vector_ids);
     ASSERT_TRUE(status.ok());
 
@@ -198,7 +200,7 @@ TEST_F(MemManagerTest, MEM_TABLE_TEST) {
     std::vector<float> vectors_1G;
     BuildVectors(n_1G, vectors_1G);
 
-    engine::VectorSourcePtr source_1G = std::make_shared<engine::VectorSource>(n_1G, vectors_1G.data());
+    ms::engine::VectorSourcePtr source_1G = std::make_shared<ms::engine::VectorSource>(n_1G, vectors_1G.data());
 
     vector_ids.clear();
     status = mem_table.Add(source_1G, vector_ids);
@@ -207,7 +209,7 @@ TEST_F(MemManagerTest, MEM_TABLE_TEST) {
     vector_ids = source_1G->GetVectorIds();
     ASSERT_EQ(vector_ids.size(), n_1G);
 
-    int expectedTableFileCount = 2 + std::ceil((n_1G - n_100) * singleVectorMem / engine::MAX_TABLE_FILE_MEM);
+    int expectedTableFileCount = 2 + std::ceil((n_1G - n_100) * singleVectorMem / ms::engine::MAX_TABLE_FILE_MEM);
     ASSERT_EQ(mem_table.GetTableFileCount(), expectedTableFileCount);
 
     status = mem_table.Serialize();
@@ -215,11 +217,11 @@ TEST_F(MemManagerTest, MEM_TABLE_TEST) {
 }
 
 TEST_F(MemManagerTest2, SERIAL_INSERT_SEARCH_TEST) {
-    engine::meta::TableSchema table_info = BuildTableSchema();
+    ms::engine::meta::TableSchema table_info = BuildTableSchema();
     auto stat = db_->CreateTable(table_info);
 
-    engine::meta::TableSchema table_info_get;
-    table_info_get.table_id_ = TABLE_NAME;
+    ms::engine::meta::TableSchema table_info_get;
+    table_info_get.table_id_ = GetTableName();
     stat = db_->DescribeTable(table_info_get);
     ASSERT_TRUE(stat.ok());
     ASSERT_EQ(table_info_get.dimension_, TABLE_DIM);
@@ -228,12 +230,12 @@ TEST_F(MemManagerTest2, SERIAL_INSERT_SEARCH_TEST) {
     std::vector<float> xb;
     BuildVectors(nb, xb);
 
-    engine::IDNumbers vector_ids;
-    for(int64_t i = 0; i < nb; i++) {
+    ms::engine::IDNumbers vector_ids;
+    for (int64_t i = 0; i < nb; i++) {
         vector_ids.push_back(i);
     }
 
-    stat = db_->InsertVectors(TABLE_NAME, nb, xb.data(), vector_ids);
+    stat = db_->InsertVectors(GetTableName(), nb, xb.data(), vector_ids);
     ASSERT_TRUE(stat.ok());
 
     std::this_thread::sleep_for(std::chrono::seconds(3));//ensure raw data write to disk
@@ -256,19 +258,19 @@ TEST_F(MemManagerTest2, SERIAL_INSERT_SEARCH_TEST) {
     int topk = 10, nprobe = 10;
     for (auto &pair : search_vectors) {
         auto &search = pair.second;
-        engine::QueryResults results;
-        stat = db_->Query(TABLE_NAME, topk, 1, nprobe, search.data(), results);
+        ms::engine::QueryResults results;
+        stat = db_->Query(GetTableName(), topk, 1, nprobe, search.data(), results);
         ASSERT_EQ(results[0][0].first, pair.first);
         ASSERT_LT(results[0][0].second, 1e-4);
     }
 }
 
 TEST_F(MemManagerTest2, INSERT_TEST) {
-    engine::meta::TableSchema table_info = BuildTableSchema();
+    ms::engine::meta::TableSchema table_info = BuildTableSchema();
     auto stat = db_->CreateTable(table_info);
 
-    engine::meta::TableSchema table_info_get;
-    table_info_get.table_id_ = TABLE_NAME;
+    ms::engine::meta::TableSchema table_info_get;
+    table_info_get.table_id_ = GetTableName();
     stat = db_->DescribeTable(table_info_get);
     ASSERT_TRUE(stat.ok());
     ASSERT_EQ(table_info_get.dimension_, TABLE_DIM);
@@ -280,8 +282,8 @@ TEST_F(MemManagerTest2, INSERT_TEST) {
         int64_t nb = 40960;
         std::vector<float> xb;
         BuildVectors(nb, xb);
-        engine::IDNumbers vector_ids;
-        stat = db_->InsertVectors(TABLE_NAME, nb, xb.data(), vector_ids);
+        ms::engine::IDNumbers vector_ids;
+        stat = db_->InsertVectors(GetTableName(), nb, xb.data(), vector_ids);
         ASSERT_TRUE(stat.ok());
     }
     auto end_time = METRICS_NOW_TIME;
@@ -290,17 +292,17 @@ TEST_F(MemManagerTest2, INSERT_TEST) {
 }
 
 TEST_F(MemManagerTest2, CONCURRENT_INSERT_SEARCH_TEST) {
-    engine::meta::TableSchema table_info = BuildTableSchema();
+    ms::engine::meta::TableSchema table_info = BuildTableSchema();
     auto stat = db_->CreateTable(table_info);
 
-    engine::meta::TableSchema table_info_get;
-    table_info_get.table_id_ = TABLE_NAME;
+    ms::engine::meta::TableSchema table_info_get;
+    table_info_get.table_id_ = GetTableName();
     stat = db_->DescribeTable(table_info_get);
     ASSERT_TRUE(stat.ok());
     ASSERT_EQ(table_info_get.dimension_, TABLE_DIM);
 
-    engine::IDNumbers vector_ids;
-    engine::IDNumbers target_ids;
+    ms::engine::IDNumbers vector_ids;
+    ms::engine::IDNumbers target_ids;
 
     int64_t nb = 40960;
     std::vector<float> xb;
@@ -311,7 +313,7 @@ TEST_F(MemManagerTest2, CONCURRENT_INSERT_SEARCH_TEST) {
     BuildVectors(qb, qxb);
 
     std::thread search([&]() {
-        engine::QueryResults results;
+        ms::engine::QueryResults results;
         int k = 10;
         std::this_thread::sleep_for(std::chrono::seconds(2));
 
@@ -326,8 +328,8 @@ TEST_F(MemManagerTest2, CONCURRENT_INSERT_SEARCH_TEST) {
             prev_count = count;
 
             START_TIMER;
-            stat = db_->Query(TABLE_NAME, k, qb, 10, qxb.data(), results);
-            ss << "Search " << j << " With Size " << count / engine::meta::M << " M";
+            stat = db_->Query(GetTableName(), k, qb, 10, qxb.data(), results);
+            ss << "Search " << j << " With Size " << count / ms::engine::meta::M << " M";
             STOP_TIMER(ss.str());
 
             ASSERT_TRUE(stat.ok());
@@ -349,29 +351,28 @@ TEST_F(MemManagerTest2, CONCURRENT_INSERT_SEARCH_TEST) {
 
     for (auto i = 0; i < loop; ++i) {
         if (i == 0) {
-            db_->InsertVectors(TABLE_NAME, qb, qxb.data(), target_ids);
+            db_->InsertVectors(GetTableName(), qb, qxb.data(), target_ids);
             ASSERT_EQ(target_ids.size(), qb);
         } else {
-            db_->InsertVectors(TABLE_NAME, nb, xb.data(), vector_ids);
+            db_->InsertVectors(GetTableName(), nb, xb.data(), vector_ids);
         }
         std::this_thread::sleep_for(std::chrono::microseconds(1));
     }
 
     search.join();
-};
+}
 
 TEST_F(MemManagerTest2, VECTOR_IDS_TEST) {
-    engine::meta::TableSchema table_info = BuildTableSchema();
+    ms::engine::meta::TableSchema table_info = BuildTableSchema();
     auto stat = db_->CreateTable(table_info);
 
-    engine::meta::TableSchema table_info_get;
-    table_info_get.table_id_ = TABLE_NAME;
+    ms::engine::meta::TableSchema table_info_get;
+    table_info_get.table_id_ = GetTableName();
     stat = db_->DescribeTable(table_info_get);
     ASSERT_TRUE(stat.ok());
     ASSERT_EQ(table_info_get.dimension_, TABLE_DIM);
 
-    engine::IDNumbers vector_ids;
-
+    ms::engine::IDNumbers vector_ids;
 
     int64_t nb = 100000;
     std::vector<float> xb;
@@ -382,7 +383,7 @@ TEST_F(MemManagerTest2, VECTOR_IDS_TEST) {
         vector_ids[i] = i;
     }
 
-    stat = db_->InsertVectors(TABLE_NAME, nb, xb.data(), vector_ids);
+    stat = db_->InsertVectors(GetTableName(), nb, xb.data(), vector_ids);
     ASSERT_EQ(vector_ids[0], 0);
     ASSERT_TRUE(stat.ok());
 
@@ -394,7 +395,7 @@ TEST_F(MemManagerTest2, VECTOR_IDS_TEST) {
     for (auto i = 0; i < nb; i++) {
         vector_ids[i] = i + nb;
     }
-    stat = db_->InsertVectors(TABLE_NAME, nb, xb.data(), vector_ids);
+    stat = db_->InsertVectors(GetTableName(), nb, xb.data(), vector_ids);
     ASSERT_EQ(vector_ids[0], nb);
     ASSERT_TRUE(stat.ok());
 
@@ -406,15 +407,15 @@ TEST_F(MemManagerTest2, VECTOR_IDS_TEST) {
     for (auto i = 0; i < nb; i++) {
         vector_ids[i] = i + nb / 2;
     }
-    stat = db_->InsertVectors(TABLE_NAME, nb, xb.data(), vector_ids);
-    ASSERT_EQ(vector_ids[0], nb/2);
+    stat = db_->InsertVectors(GetTableName(), nb, xb.data(), vector_ids);
+    ASSERT_EQ(vector_ids[0], nb / 2);
     ASSERT_TRUE(stat.ok());
 
     nb = 65536; //128M
     xb.clear();
     BuildVectors(nb, xb);
     vector_ids.clear();
-    stat = db_->InsertVectors(TABLE_NAME, nb, xb.data(), vector_ids);
+    stat = db_->InsertVectors(GetTableName(), nb, xb.data(), vector_ids);
     ASSERT_TRUE(stat.ok());
 
     nb = 100;
@@ -425,8 +426,9 @@ TEST_F(MemManagerTest2, VECTOR_IDS_TEST) {
     for (auto i = 0; i < nb; i++) {
         vector_ids[i] = i + nb;
     }
-    stat = db_->InsertVectors(TABLE_NAME, nb, xb.data(), vector_ids);
+    stat = db_->InsertVectors(GetTableName(), nb, xb.data(), vector_ids);
     for (auto i = 0; i < nb; i++) {
         ASSERT_EQ(vector_ids[i], i + nb);
     }
 }
+
diff --git a/cpp/unittest/db/meta_tests.cpp b/cpp/unittest/db/meta_tests.cpp
index 23897408bc..39217ea298 100644
--- a/cpp/unittest/db/meta_tests.cpp
+++ b/cpp/unittest/db/meta_tests.cpp
@@ -15,7 +15,7 @@
 // specific language governing permissions and limitations
 // under the License.
 
-#include "utils.h"
+#include "db/utils.h"
 #include "db/meta/SqliteMetaImpl.h"
 #include "db/Utils.h"
 #include "db/meta/MetaConsts.h"
@@ -25,13 +25,16 @@
 #include <stdlib.h>
 #include <time.h>
 
-using namespace zilliz::milvus;
-using namespace zilliz::milvus::engine;
+namespace {
+
+namespace ms = zilliz::milvus;
+
+} // namespace
 
 TEST_F(MetaTest, TABLE_TEST) {
     auto table_id = "meta_test_table";
 
-    meta::TableSchema table;
+    ms::engine::meta::TableSchema table;
     table.table_id_ = table_id;
     auto status = impl_->CreateTable(table);
     ASSERT_TRUE(status.ok());
@@ -49,7 +52,7 @@ TEST_F(MetaTest, TABLE_TEST) {
 
     table.table_id_ = table_id;
     status = impl_->CreateTable(table);
-    ASSERT_EQ(status.code(), DB_ALREADY_EXIST);
+    ASSERT_EQ(status.code(), ms::DB_ALREADY_EXIST);
 
     table.table_id_ = "";
     status = impl_->CreateTable(table);
@@ -59,16 +62,16 @@ TEST_F(MetaTest, TABLE_TEST) {
 TEST_F(MetaTest, TABLE_FILE_TEST) {
     auto table_id = "meta_test_table";
 
-    meta::TableSchema table;
+    ms::engine::meta::TableSchema table;
     table.table_id_ = table_id;
     table.dimension_ = 256;
     auto status = impl_->CreateTable(table);
 
-    meta::TableFileSchema table_file;
+    ms::engine::meta::TableFileSchema table_file;
     table_file.table_id_ = table.table_id_;
     status = impl_->CreateTableFile(table_file);
     ASSERT_TRUE(status.ok());
-    ASSERT_EQ(table_file.file_type_, meta::TableFileSchema::NEW);
+    ASSERT_EQ(table_file.file_type_, ms::engine::meta::TableFileSchema::NEW);
 
     uint64_t cnt = 0;
     status = impl_->Count(table_id, cnt);
@@ -77,30 +80,30 @@ TEST_F(MetaTest, TABLE_FILE_TEST) {
 
     auto file_id = table_file.file_id_;
 
-    auto new_file_type = meta::TableFileSchema::INDEX;
+    auto new_file_type = ms::engine::meta::TableFileSchema::INDEX;
     table_file.file_type_ = new_file_type;
 
     status = impl_->UpdateTableFile(table_file);
     ASSERT_TRUE(status.ok());
     ASSERT_EQ(table_file.file_type_, new_file_type);
 
-    meta::DatesT dates;
-    dates.push_back(utils::GetDate());
+    ms::engine::meta::DatesT dates;
+    dates.push_back(ms::engine::utils::GetDate());
     status = impl_->DropPartitionsByDates(table_file.table_id_, dates);
     ASSERT_TRUE(status.ok());
 
     dates.clear();
-    for (auto i=2; i < 10; ++i) {
-        dates.push_back(utils::GetDateWithDelta(-1*i));
+    for (auto i = 2; i < 10; ++i) {
+        dates.push_back(ms::engine::utils::GetDateWithDelta(-1 * i));
     }
     status = impl_->DropPartitionsByDates(table_file.table_id_, dates);
     ASSERT_TRUE(status.ok());
 
-    table_file.date_ = utils::GetDateWithDelta(-2);
+    table_file.date_ = ms::engine::utils::GetDateWithDelta(-2);
     status = impl_->UpdateTableFile(table_file);
     ASSERT_TRUE(status.ok());
-    ASSERT_EQ(table_file.date_, utils::GetDateWithDelta(-2));
-    ASSERT_FALSE(table_file.file_type_ == meta::TableFileSchema::TO_DELETE);
+    ASSERT_EQ(table_file.date_, ms::engine::utils::GetDateWithDelta(-2));
+    ASSERT_FALSE(table_file.file_type_ == ms::engine::meta::TableFileSchema::TO_DELETE);
 
     dates.clear();
     dates.push_back(table_file.date_);
@@ -108,7 +111,7 @@ TEST_F(MetaTest, TABLE_FILE_TEST) {
     ASSERT_TRUE(status.ok());
 
     std::vector<size_t> ids = {table_file.id_};
-    meta::TableFilesSchema files;
+    ms::engine::meta::TableFilesSchema files;
     status = impl_->GetTableFiles(table_file.table_id_, ids, files);
     ASSERT_TRUE(status.ok());
     ASSERT_EQ(files.size(), 0UL);
@@ -116,33 +119,34 @@ TEST_F(MetaTest, TABLE_FILE_TEST) {
 
 TEST_F(MetaTest, ARCHIVE_TEST_DAYS) {
     srand(time(0));
-    DBMetaOptions options;
+    ms::engine::DBMetaOptions options;
     options.path_ = "/tmp/milvus_test";
-    int days_num = rand() % 100;
+    unsigned int seed = 1;
+    int days_num = rand_r(&seed) % 100;
     std::stringstream ss;
     ss << "days:" << days_num;
-    options.archive_conf_ = ArchiveConf("delete", ss.str());
+    options.archive_conf_ = ms::engine::ArchiveConf("delete", ss.str());
 
-    meta::SqliteMetaImpl impl(options);
+    ms::engine::meta::SqliteMetaImpl impl(options);
     auto table_id = "meta_test_table";
 
-    meta::TableSchema table;
+    ms::engine::meta::TableSchema table;
     table.table_id_ = table_id;
     auto status = impl.CreateTable(table);
 
-    meta::TableFilesSchema files;
-    meta::TableFileSchema table_file;
+    ms::engine::meta::TableFilesSchema files;
+    ms::engine::meta::TableFileSchema table_file;
     table_file.table_id_ = table.table_id_;
 
     auto cnt = 100;
-    long ts = utils::GetMicroSecTimeStamp();
+    int64_t ts = ms::engine::utils::GetMicroSecTimeStamp();
     std::vector<int> days;
     std::vector<size_t> ids;
-    for (auto i=0; i<cnt; ++i) {
+    for (auto i = 0; i < cnt; ++i) {
         status = impl.CreateTableFile(table_file);
-        table_file.file_type_ = meta::TableFileSchema::NEW;
-        int day = rand() % (days_num*2);
-        table_file.created_on_ = ts - day*meta::D_SEC*meta::US_PS - 10000;
+        table_file.file_type_ = ms::engine::meta::TableFileSchema::NEW;
+        int day = rand_r(&seed) % (days_num * 2);
+        table_file.created_on_ = ts - day * ms::engine::meta::D_SEC * ms::engine::meta::US_PS - 10000;
         status = impl.UpdateTableFile(table_file);
         files.push_back(table_file);
         days.push_back(day);
@@ -152,13 +156,13 @@ TEST_F(MetaTest, ARCHIVE_TEST_DAYS) {
     impl.Archive();
     int i = 0;
 
-    meta::TableFilesSchema files_get;
+    ms::engine::meta::TableFilesSchema files_get;
     status = impl.GetTableFiles(table_file.table_id_, ids, files_get);
     ASSERT_TRUE(status.ok());
 
-    for(auto& file : files_get) {
+    for (auto &file : files_get) {
         if (days[i] < days_num) {
-            ASSERT_EQ(file.file_type_, meta::TableFileSchema::NEW);
+            ASSERT_EQ(file.file_type_, ms::engine::meta::TableFileSchema::NEW);
         }
         i++;
     }
@@ -167,28 +171,28 @@ TEST_F(MetaTest, ARCHIVE_TEST_DAYS) {
 }
 
 TEST_F(MetaTest, ARCHIVE_TEST_DISK) {
-    DBMetaOptions options;
+    ms::engine::DBMetaOptions options;
     options.path_ = "/tmp/milvus_test";
-    options.archive_conf_ = ArchiveConf("delete", "disk:11");
+    options.archive_conf_ = ms::engine::ArchiveConf("delete", "disk:11");
 
-    meta::SqliteMetaImpl impl(options);
+    ms::engine::meta::SqliteMetaImpl impl(options);
     auto table_id = "meta_test_group";
 
-    meta::TableSchema table;
+    ms::engine::meta::TableSchema table;
     table.table_id_ = table_id;
     auto status = impl.CreateTable(table);
 
-    meta::TableFilesSchema files;
-    meta::TableFileSchema table_file;
+    ms::engine::meta::TableFilesSchema files;
+    ms::engine::meta::TableFileSchema table_file;
     table_file.table_id_ = table.table_id_;
 
     auto cnt = 10;
     auto each_size = 2UL;
     std::vector<size_t> ids;
-    for (auto i=0; i<cnt; ++i) {
+    for (auto i = 0; i < cnt; ++i) {
         status = impl.CreateTableFile(table_file);
-        table_file.file_type_ = meta::TableFileSchema::NEW;
-        table_file.file_size_ = each_size * meta::G;
+        table_file.file_type_ = ms::engine::meta::TableFileSchema::NEW;
+        table_file.file_size_ = each_size * ms::engine::meta::G;
         status = impl.UpdateTableFile(table_file);
         files.push_back(table_file);
         ids.push_back(table_file.id_);
@@ -197,13 +201,13 @@ TEST_F(MetaTest, ARCHIVE_TEST_DISK) {
     impl.Archive();
     int i = 0;
 
-    meta::TableFilesSchema files_get;
+    ms::engine::meta::TableFilesSchema files_get;
     status = impl.GetTableFiles(table_file.table_id_, ids, files_get);
     ASSERT_TRUE(status.ok());
 
-    for(auto& file : files_get) {
+    for (auto &file : files_get) {
         if (i >= 5) {
-            ASSERT_EQ(file.file_type_, meta::TableFileSchema::NEW);
+            ASSERT_EQ(file.file_type_, ms::engine::meta::TableFileSchema::NEW);
         }
         ++i;
     }
@@ -214,7 +218,7 @@ TEST_F(MetaTest, ARCHIVE_TEST_DISK) {
 TEST_F(MetaTest, TABLE_FILES_TEST) {
     auto table_id = "meta_test_group";
 
-    meta::TableSchema table;
+    ms::engine::meta::TableSchema table;
     table.table_id_ = table_id;
     auto status = impl_->CreateTable(table);
 
@@ -226,51 +230,51 @@ TEST_F(MetaTest, TABLE_FILES_TEST) {
     uint64_t to_index_files_cnt = 6;
     uint64_t index_files_cnt = 7;
 
-    meta::TableFileSchema table_file;
+    ms::engine::meta::TableFileSchema table_file;
     table_file.table_id_ = table.table_id_;
 
-    for (auto i=0; i<new_merge_files_cnt; ++i) {
+    for (auto i = 0; i < new_merge_files_cnt; ++i) {
         status = impl_->CreateTableFile(table_file);
-        table_file.file_type_ = meta::TableFileSchema::NEW_MERGE;
+        table_file.file_type_ = ms::engine::meta::TableFileSchema::NEW_MERGE;
         status = impl_->UpdateTableFile(table_file);
     }
 
-    for (auto i=0; i<new_index_files_cnt; ++i) {
+    for (auto i = 0; i < new_index_files_cnt; ++i) {
         status = impl_->CreateTableFile(table_file);
-        table_file.file_type_ = meta::TableFileSchema::NEW_INDEX;
+        table_file.file_type_ = ms::engine::meta::TableFileSchema::NEW_INDEX;
         status = impl_->UpdateTableFile(table_file);
     }
 
-    for (auto i=0; i<backup_files_cnt; ++i) {
+    for (auto i = 0; i < backup_files_cnt; ++i) {
         status = impl_->CreateTableFile(table_file);
-        table_file.file_type_ = meta::TableFileSchema::BACKUP;
+        table_file.file_type_ = ms::engine::meta::TableFileSchema::BACKUP;
         table_file.row_count_ = 1;
         status = impl_->UpdateTableFile(table_file);
     }
 
-    for (auto i=0; i<new_files_cnt; ++i) {
+    for (auto i = 0; i < new_files_cnt; ++i) {
         status = impl_->CreateTableFile(table_file);
-        table_file.file_type_ = meta::TableFileSchema::NEW;
+        table_file.file_type_ = ms::engine::meta::TableFileSchema::NEW;
         status = impl_->UpdateTableFile(table_file);
     }
 
-    for (auto i=0; i<raw_files_cnt; ++i) {
+    for (auto i = 0; i < raw_files_cnt; ++i) {
         status = impl_->CreateTableFile(table_file);
-        table_file.file_type_ = meta::TableFileSchema::RAW;
+        table_file.file_type_ = ms::engine::meta::TableFileSchema::RAW;
         table_file.row_count_ = 1;
         status = impl_->UpdateTableFile(table_file);
     }
 
-    for (auto i=0; i<to_index_files_cnt; ++i) {
+    for (auto i = 0; i < to_index_files_cnt; ++i) {
         status = impl_->CreateTableFile(table_file);
-        table_file.file_type_ = meta::TableFileSchema::TO_INDEX;
+        table_file.file_type_ = ms::engine::meta::TableFileSchema::TO_INDEX;
         table_file.row_count_ = 1;
         status = impl_->UpdateTableFile(table_file);
     }
 
-    for (auto i=0; i<index_files_cnt; ++i) {
+    for (auto i = 0; i < index_files_cnt; ++i) {
         status = impl_->CreateTableFile(table_file);
-        table_file.file_type_ = meta::TableFileSchema::INDEX;
+        table_file.file_type_ = ms::engine::meta::TableFileSchema::INDEX;
         table_file.row_count_ = 1;
         status = impl_->UpdateTableFile(table_file);
     }
@@ -278,36 +282,36 @@ TEST_F(MetaTest, TABLE_FILES_TEST) {
     uint64_t total_row_count = 0;
     status = impl_->Count(table_id, total_row_count);
     ASSERT_TRUE(status.ok());
-    ASSERT_EQ(total_row_count, raw_files_cnt+to_index_files_cnt+index_files_cnt);
+    ASSERT_EQ(total_row_count, raw_files_cnt + to_index_files_cnt + index_files_cnt);
 
-    meta::TableFilesSchema files;
+    ms::engine::meta::TableFilesSchema files;
     status = impl_->FilesToIndex(files);
     ASSERT_EQ(files.size(), to_index_files_cnt);
 
-    meta::DatePartionedTableFilesSchema dated_files;
+    ms::engine::meta::DatePartionedTableFilesSchema dated_files;
     status = impl_->FilesToMerge(table.table_id_, dated_files);
     ASSERT_EQ(dated_files[table_file.date_].size(), raw_files_cnt);
 
     status = impl_->FilesToIndex(files);
     ASSERT_EQ(files.size(), to_index_files_cnt);
 
-    meta::DatesT dates = {table_file.date_};
+    ms::engine::meta::DatesT dates = {table_file.date_};
     std::vector<size_t> ids;
     status = impl_->FilesToSearch(table_id, ids, dates, dated_files);
     ASSERT_EQ(dated_files[table_file.date_].size(),
-            to_index_files_cnt+raw_files_cnt+index_files_cnt);
+              to_index_files_cnt + raw_files_cnt + index_files_cnt);
 
-    status = impl_->FilesToSearch(table_id, ids, meta::DatesT(), dated_files);
+    status = impl_->FilesToSearch(table_id, ids, ms::engine::meta::DatesT(), dated_files);
     ASSERT_EQ(dated_files[table_file.date_].size(),
-              to_index_files_cnt+raw_files_cnt+index_files_cnt);
+              to_index_files_cnt + raw_files_cnt + index_files_cnt);
 
-    status = impl_->FilesToSearch(table_id, ids, meta::DatesT(), dated_files);
+    status = impl_->FilesToSearch(table_id, ids, ms::engine::meta::DatesT(), dated_files);
     ASSERT_EQ(dated_files[table_file.date_].size(),
-              to_index_files_cnt+raw_files_cnt+index_files_cnt);
+              to_index_files_cnt + raw_files_cnt + index_files_cnt);
 
     ids.push_back(size_t(9999999999));
     status = impl_->FilesToSearch(table_id, ids, dates, dated_files);
-    ASSERT_EQ(dated_files[table_file.date_].size(),0);
+    ASSERT_EQ(dated_files[table_file.date_].size(), 0);
 
     std::vector<int> file_types;
     std::vector<std::string> file_ids;
@@ -316,26 +320,26 @@ TEST_F(MetaTest, TABLE_FILES_TEST) {
     ASSERT_FALSE(status.ok());
 
     file_types = {
-            meta::TableFileSchema::NEW,
-            meta::TableFileSchema::NEW_MERGE,
-            meta::TableFileSchema::NEW_INDEX,
-            meta::TableFileSchema::TO_INDEX,
-            meta::TableFileSchema::INDEX,
-            meta::TableFileSchema::RAW,
-            meta::TableFileSchema::BACKUP,
+        ms::engine::meta::TableFileSchema::NEW,
+        ms::engine::meta::TableFileSchema::NEW_MERGE,
+        ms::engine::meta::TableFileSchema::NEW_INDEX,
+        ms::engine::meta::TableFileSchema::TO_INDEX,
+        ms::engine::meta::TableFileSchema::INDEX,
+        ms::engine::meta::TableFileSchema::RAW,
+        ms::engine::meta::TableFileSchema::BACKUP,
     };
     status = impl_->FilesByType(table.table_id_, file_types, file_ids);
     ASSERT_TRUE(status.ok());
     uint64_t total_cnt = new_index_files_cnt + new_merge_files_cnt +
-                         backup_files_cnt + new_files_cnt + raw_files_cnt +
-                         to_index_files_cnt + index_files_cnt;
+        backup_files_cnt + new_files_cnt + raw_files_cnt +
+        to_index_files_cnt + index_files_cnt;
     ASSERT_EQ(file_ids.size(), total_cnt);
 
     status = impl_->DeleteTableFiles(table_id);
     ASSERT_TRUE(status.ok());
 
     status = impl_->CreateTableFile(table_file);
-    table_file.file_type_ = meta::TableFileSchema::NEW;
+    table_file.file_type_ = ms::engine::meta::TableFileSchema::NEW;
     status = impl_->UpdateTableFile(table_file);
     status = impl_->CleanUp();
     ASSERT_TRUE(status.ok());
@@ -350,11 +354,11 @@ TEST_F(MetaTest, TABLE_FILES_TEST) {
 TEST_F(MetaTest, INDEX_TEST) {
     auto table_id = "index_test";
 
-    meta::TableSchema table;
+    ms::engine::meta::TableSchema table;
     table.table_id_ = table_id;
     auto status = impl_->CreateTable(table);
 
-    TableIndex index;
+    ms::engine::TableIndex index;
     index.metric_type_ = 2;
     index.nlist_ = 1234;
     index.engine_type_ = 3;
@@ -365,12 +369,12 @@ TEST_F(MetaTest, INDEX_TEST) {
     status = impl_->UpdateTableFlag(table_id, flag);
     ASSERT_TRUE(status.ok());
 
-    engine::meta::TableSchema table_info;
+    ms::engine::meta::TableSchema table_info;
     table_info.table_id_ = table_id;
     status = impl_->DescribeTable(table_info);
     ASSERT_EQ(table_info.flag_, flag);
 
-    TableIndex index_out;
+    ms::engine::TableIndex index_out;
     status = impl_->DescribeTableIndex(table_id, index_out);
     ASSERT_EQ(index_out.metric_type_, index.metric_type_);
     ASSERT_EQ(index_out.nlist_, index.nlist_);
@@ -385,4 +389,4 @@ TEST_F(MetaTest, INDEX_TEST) {
 
     status = impl_->UpdateTableFilesToIndex(table_id);
     ASSERT_TRUE(status.ok());
-}
\ No newline at end of file
+}
diff --git a/cpp/unittest/db/misc_test.cpp b/cpp/unittest/db/misc_test.cpp
index 762e9944ee..d6b024930f 100644
--- a/cpp/unittest/db/misc_test.cpp
+++ b/cpp/unittest/db/misc_test.cpp
@@ -27,43 +27,47 @@
 #include <boost/filesystem.hpp>
 #include <vector>
 
-using namespace zilliz::milvus;
+namespace {
+
+namespace ms = zilliz::milvus;
+
+} // namespace
 
 TEST(DBMiscTest, EXCEPTION_TEST) {
-    Exception ex1(100, "error");
+    ms::Exception ex1(100, "error");
     std::string what = ex1.what();
     ASSERT_EQ(what, "error");
     ASSERT_EQ(ex1.code(), 100);
 
-    InvalidArgumentException ex2;
-    ASSERT_EQ(ex2.code(), SERVER_INVALID_ARGUMENT);
+    ms::InvalidArgumentException ex2;
+    ASSERT_EQ(ex2.code(), ms::SERVER_INVALID_ARGUMENT);
 }
 
 TEST(DBMiscTest, OPTIONS_TEST) {
     try {
-        engine::ArchiveConf archive("$$##");
-    } catch (std::exception& ex) {
+        ms::engine::ArchiveConf archive("$$##");
+    } catch (std::exception &ex) {
         ASSERT_TRUE(true);
     }
 
     {
-        engine::ArchiveConf archive("delete", "no");
+        ms::engine::ArchiveConf archive("delete", "no");
         ASSERT_TRUE(archive.GetCriterias().empty());
     }
 
     {
-        engine::ArchiveConf archive("delete", "1:2");
+        ms::engine::ArchiveConf archive("delete", "1:2");
         ASSERT_TRUE(archive.GetCriterias().empty());
     }
 
     {
-        engine::ArchiveConf archive("delete", "1:2:3");
+        ms::engine::ArchiveConf archive("delete", "1:2:3");
         ASSERT_TRUE(archive.GetCriterias().empty());
     }
 
     {
-        engine::ArchiveConf archive("delete");
-        engine::ArchiveConf::CriteriaT criterial = {
+        ms::engine::ArchiveConf archive("delete");
+        ms::engine::ArchiveConf::CriteriaT criterial = {
             {"disk", 1024},
             {"days", 100}
         };
@@ -76,29 +80,29 @@ TEST(DBMiscTest, OPTIONS_TEST) {
 }
 
 TEST(DBMiscTest, META_TEST) {
-    engine::DBMetaOptions options;
+    ms::engine::DBMetaOptions options;
     options.path_ = "/tmp/milvus_test";
-    engine::meta::SqliteMetaImpl impl(options);
+    ms::engine::meta::SqliteMetaImpl impl(options);
 
     time_t tt;
-    time( &tt );
+    time(&tt);
     int delta = 10;
-    engine::meta::DateT dt = engine::utils::GetDate(tt, delta);
+    ms::engine::meta::DateT dt = ms::engine::utils::GetDate(tt, delta);
     ASSERT_GT(dt, 0);
 }
 
 TEST(DBMiscTest, UTILS_TEST) {
-    engine::DBMetaOptions options;
+    ms::engine::DBMetaOptions options;
     options.path_ = "/tmp/milvus_test/main";
     options.slave_paths_.push_back("/tmp/milvus_test/slave_1");
     options.slave_paths_.push_back("/tmp/milvus_test/slave_2");
 
     const std::string TABLE_NAME = "test_tbl";
-    auto status =  engine::utils::CreateTablePath(options, TABLE_NAME);
+    auto status = ms::engine::utils::CreateTablePath(options, TABLE_NAME);
     ASSERT_TRUE(status.ok());
     ASSERT_TRUE(boost::filesystem::exists(options.path_));
-    for(auto& path : options.slave_paths_) {
-       ASSERT_TRUE(boost::filesystem::exists(path));
+    for (auto &path : options.slave_paths_) {
+        ASSERT_TRUE(boost::filesystem::exists(path));
     }
 
 //    options.slave_paths.push_back("/");
@@ -109,18 +113,18 @@ TEST(DBMiscTest, UTILS_TEST) {
 //    status =  engine::utils::CreateTablePath(options, TABLE_NAME);
 //    ASSERT_FALSE(status.ok());
 
-    engine::meta::TableFileSchema file;
+    ms::engine::meta::TableFileSchema file;
     file.id_ = 50;
     file.table_id_ = TABLE_NAME;
     file.file_type_ = 3;
     file.date_ = 155000;
-    status = engine::utils::GetTableFilePath(options, file);
+    status = ms::engine::utils::GetTableFilePath(options, file);
     ASSERT_FALSE(status.ok());
     ASSERT_TRUE(file.location_.empty());
 
-    status = engine::utils::DeleteTablePath(options, TABLE_NAME);
+    status = ms::engine::utils::DeleteTablePath(options, TABLE_NAME);
     ASSERT_TRUE(status.ok());
 
-    status = engine::utils::DeleteTableFilePath(options, file);
+    status = ms::engine::utils::DeleteTableFilePath(options, file);
     ASSERT_TRUE(status.ok());
-}
\ No newline at end of file
+}
diff --git a/cpp/unittest/db/mysql_db_test.cpp b/cpp/unittest/db/mysql_db_test.cpp
index 53ce51ca45..2a7456785e 100644
--- a/cpp/unittest/db/mysql_db_test.cpp
+++ b/cpp/unittest/db/mysql_db_test.cpp
@@ -15,7 +15,7 @@
 // specific language governing permissions and limitations
 // under the License.
 
-#include "utils.h"
+#include "db/utils.h"
 #include "db/DB.h"
 #include "db/DBImpl.h"
 #include "db/meta/MetaConsts.h"
@@ -26,48 +26,49 @@
 #include <thread>
 #include <random>
 
-using namespace zilliz::milvus;
-
 namespace {
 
-    static const char* TABLE_NAME = "test_group";
-    static constexpr int64_t TABLE_DIM = 256;
-    static constexpr int64_t VECTOR_COUNT = 25000;
-    static constexpr int64_t INSERT_LOOP = 1000;
+namespace ms = zilliz::milvus;
 
-    engine::meta::TableSchema BuildTableSchema() {
-        engine::meta::TableSchema table_info;
-        table_info.dimension_ = TABLE_DIM;
-        table_info.table_id_ = TABLE_NAME;
-        table_info.engine_type_ = (int)engine::EngineType::FAISS_IDMAP;
-        return table_info;
-    }
-
-    void BuildVectors(int64_t n, std::vector<float>& vectors) {
-        vectors.clear();
-        vectors.resize(n*TABLE_DIM);
-        float* data = vectors.data();
-        for(int i = 0; i < n; i++) {
-            for(int j = 0; j < TABLE_DIM; j++) data[TABLE_DIM * i + j] = drand48();
-            data[TABLE_DIM * i] += i / 2000.;
-        }
-    }
+static const char *TABLE_NAME = "test_group";
+static constexpr int64_t TABLE_DIM = 256;
+static constexpr int64_t VECTOR_COUNT = 25000;
+static constexpr int64_t INSERT_LOOP = 1000;
 
+ms::engine::meta::TableSchema
+BuildTableSchema() {
+    ms::engine::meta::TableSchema table_info;
+    table_info.dimension_ = TABLE_DIM;
+    table_info.table_id_ = TABLE_NAME;
+    table_info.engine_type_ = (int) ms::engine::EngineType::FAISS_IDMAP;
+    return table_info;
 }
 
+void
+BuildVectors(int64_t n, std::vector<float> &vectors) {
+    vectors.clear();
+    vectors.resize(n * TABLE_DIM);
+    float *data = vectors.data();
+    for (int i = 0; i < n; i++) {
+        for (int j = 0; j < TABLE_DIM; j++) data[TABLE_DIM * i + j] = drand48();
+        data[TABLE_DIM * i] += i / 2000.;
+    }
+}
+
+} // namespace
 
 TEST_F(MySqlDBTest, DB_TEST) {
-    engine::meta::TableSchema table_info = BuildTableSchema();
+    ms::engine::meta::TableSchema table_info = BuildTableSchema();
     auto stat = db_->CreateTable(table_info);
 
-    engine::meta::TableSchema table_info_get;
+    ms::engine::meta::TableSchema table_info_get;
     table_info_get.table_id_ = TABLE_NAME;
     stat = db_->DescribeTable(table_info_get);
     ASSERT_TRUE(stat.ok());
     ASSERT_EQ(table_info_get.dimension_, TABLE_DIM);
 
-    engine::IDNumbers vector_ids;
-    engine::IDNumbers target_ids;
+    ms::engine::IDNumbers vector_ids;
+    ms::engine::IDNumbers target_ids;
 
     int64_t nb = 50;
     std::vector<float> xb;
@@ -81,7 +82,7 @@ TEST_F(MySqlDBTest, DB_TEST) {
     ASSERT_EQ(target_ids.size(), qb);
 
     std::thread search([&]() {
-        engine::QueryResults results;
+        ms::engine::QueryResults results;
         int k = 10;
         std::this_thread::sleep_for(std::chrono::seconds(5));
 
@@ -90,22 +91,22 @@ TEST_F(MySqlDBTest, DB_TEST) {
         uint64_t count = 0;
         uint64_t prev_count = 0;
 
-        for (auto j=0; j<10; ++j) {
+        for (auto j = 0; j < 10; ++j) {
             ss.str("");
             db_->Size(count);
             prev_count = count;
 
             START_TIMER;
             stat = db_->Query(TABLE_NAME, k, qb, 10, qxb.data(), results);
-            ss << "Search " << j << " With Size " << count/engine::meta::M << " M";
+            ss << "Search " << j << " With Size " << count / ms::engine::meta::M << " M";
             STOP_TIMER(ss.str());
 
             ASSERT_TRUE(stat.ok());
-            for (auto k=0; k<qb; ++k) {
+            for (auto k = 0; k < qb; ++k) {
 //                std::cout << results[k][0].first << " " << target_ids[k] << std::endl;
 //                ASSERT_EQ(results[k][0].first, target_ids[k]);
                 bool exists = false;
-                for (auto& result : results[k]) {
+                for (auto &result : results[k]) {
                     if (result.first == target_ids[k]) {
                         exists = true;
                     }
@@ -127,7 +128,7 @@ TEST_F(MySqlDBTest, DB_TEST) {
 
     int loop = INSERT_LOOP;
 
-    for (auto i=0; i<loop; ++i) {
+    for (auto i = 0; i < loop; ++i) {
 //        if (i==10) {
 //            db_->InsertVectors(TABLE_NAME, qb, qxb.data(), target_ids);
 //            ASSERT_EQ(target_ids.size(), qb);
@@ -139,13 +140,13 @@ TEST_F(MySqlDBTest, DB_TEST) {
     }
 
     search.join();
-};
+}
 
 TEST_F(MySqlDBTest, SEARCH_TEST) {
-    engine::meta::TableSchema table_info = BuildTableSchema();
+    ms::engine::meta::TableSchema table_info = BuildTableSchema();
     auto stat = db_->CreateTable(table_info);
 
-    engine::meta::TableSchema table_info_get;
+    ms::engine::meta::TableSchema table_info_get;
     table_info_get.table_id_ = TABLE_NAME;
     stat = db_->DescribeTable(table_info_get);
     ASSERT_TRUE(stat.ok());
@@ -155,68 +156,68 @@ TEST_F(MySqlDBTest, SEARCH_TEST) {
     size_t nb = VECTOR_COUNT;
     size_t nq = 10;
     size_t k = 5;
-    std::vector<float> xb(nb*TABLE_DIM);
-    std::vector<float> xq(nq*TABLE_DIM);
-    std::vector<long> ids(nb);
+    std::vector<float> xb(nb * TABLE_DIM);
+    std::vector<float> xq(nq * TABLE_DIM);
+    std::vector<int64_t> ids(nb);
 
     std::random_device rd;
     std::mt19937 gen(rd());
     std::uniform_real_distribution<> dis_xt(-1.0, 1.0);
-    for (size_t i = 0; i < nb*TABLE_DIM; i++) {
+    for (size_t i = 0; i < nb * TABLE_DIM; i++) {
         xb[i] = dis_xt(gen);
-        if (i < nb){
+        if (i < nb) {
             ids[i] = i;
         }
     }
-    for (size_t i = 0; i < nq*TABLE_DIM; i++) {
+    for (size_t i = 0; i < nq * TABLE_DIM; i++) {
         xq[i] = dis_xt(gen);
     }
 
     // result data
     //std::vector<long> nns_gt(k*nq);
-    std::vector<long> nns(k*nq);  // nns = nearst neg search
+    std::vector<int64_t> nns(k * nq);  // nns = nearst neg search
     //std::vector<float> dis_gt(k*nq);
-    std::vector<float> dis(k*nq);
+    std::vector<float> dis(k * nq);
 
     // insert data
     const int batch_size = 100;
     for (int j = 0; j < nb / batch_size; ++j) {
-        stat = db_->InsertVectors(TABLE_NAME, batch_size, xb.data()+batch_size*j*TABLE_DIM, ids);
-        if (j == 200){ sleep(1);}
+        stat = db_->InsertVectors(TABLE_NAME, batch_size, xb.data() + batch_size * j * TABLE_DIM, ids);
+        if (j == 200) { sleep(1); }
         ASSERT_TRUE(stat.ok());
     }
 
     sleep(2); // wait until build index finish
 
-    engine::QueryResults results;
+    ms::engine::QueryResults results;
     stat = db_->Query(TABLE_NAME, k, nq, 10, xq.data(), results);
     ASSERT_TRUE(stat.ok());
-};
+}
 
 TEST_F(MySqlDBTest, ARHIVE_DISK_CHECK) {
-    engine::meta::TableSchema table_info = BuildTableSchema();
+    ms::engine::meta::TableSchema table_info = BuildTableSchema();
     auto stat = db_->CreateTable(table_info);
 
-    std::vector<engine::meta::TableSchema> table_schema_array;
+    std::vector<ms::engine::meta::TableSchema> table_schema_array;
     stat = db_->AllTables(table_schema_array);
     ASSERT_TRUE(stat.ok());
     bool bfound = false;
-    for(auto& schema : table_schema_array) {
-        if(schema.table_id_ == TABLE_NAME) {
+    for (auto &schema : table_schema_array) {
+        if (schema.table_id_ == TABLE_NAME) {
             bfound = true;
             break;
         }
     }
     ASSERT_TRUE(bfound);
 
-    engine::meta::TableSchema table_info_get;
+    ms::engine::meta::TableSchema table_info_get;
     table_info_get.table_id_ = TABLE_NAME;
     stat = db_->DescribeTable(table_info_get);
     ASSERT_TRUE(stat.ok());
     ASSERT_EQ(table_info_get.dimension_, TABLE_DIM);
 
-    engine::IDNumbers vector_ids;
-    engine::IDNumbers target_ids;
+    ms::engine::IDNumbers vector_ids;
+    ms::engine::IDNumbers target_ids;
 
     uint64_t size;
     db_->Size(size);
@@ -226,7 +227,7 @@ TEST_F(MySqlDBTest, ARHIVE_DISK_CHECK) {
     BuildVectors(nb, xb);
 
     int loop = INSERT_LOOP;
-    for (auto i=0; i<loop; ++i) {
+    for (auto i = 0; i < loop; ++i) {
         db_->InsertVectors(TABLE_NAME, nb, xb.data(), vector_ids);
         std::this_thread::sleep_for(std::chrono::microseconds(1));
     }
@@ -235,15 +236,15 @@ TEST_F(MySqlDBTest, ARHIVE_DISK_CHECK) {
 
     db_->Size(size);
     LOG(DEBUG) << "size=" << size;
-    ASSERT_LE(size, 1 * engine::meta::G);
-};
+    ASSERT_LE(size, 1 * ms::engine::meta::G);
+}
 
 TEST_F(MySqlDBTest, DELETE_TEST) {
-    engine::meta::TableSchema table_info = BuildTableSchema();
+    ms::engine::meta::TableSchema table_info = BuildTableSchema();
     auto stat = db_->CreateTable(table_info);
 //    std::cout << stat.ToString() << std::endl;
 
-    engine::meta::TableSchema table_info_get;
+    ms::engine::meta::TableSchema table_info_get;
     table_info_get.table_id_ = TABLE_NAME;
     stat = db_->DescribeTable(table_info_get);
     ASSERT_TRUE(stat.ok());
@@ -252,7 +253,7 @@ TEST_F(MySqlDBTest, DELETE_TEST) {
     db_->HasTable(TABLE_NAME, has_table);
     ASSERT_TRUE(has_table);
 
-    engine::IDNumbers vector_ids;
+    ms::engine::IDNumbers vector_ids;
 
     uint64_t size;
     db_->Size(size);
@@ -262,7 +263,7 @@ TEST_F(MySqlDBTest, DELETE_TEST) {
     BuildVectors(nb, xb);
 
     int loop = 20;
-    for (auto i=0; i<loop; ++i) {
+    for (auto i = 0; i < loop; ++i) {
         db_->InsertVectors(TABLE_NAME, nb, xb.data(), vector_ids);
         std::this_thread::sleep_for(std::chrono::microseconds(1));
     }
@@ -276,4 +277,5 @@ TEST_F(MySqlDBTest, DELETE_TEST) {
 //
 //    db_->HasTable(TABLE_NAME, has_table);
 //    ASSERT_FALSE(has_table);
-};
+}
+
diff --git a/cpp/unittest/db/mysql_meta_test.cpp b/cpp/unittest/db/mysql_meta_test.cpp
index 46b030235e..5605b9eb14 100644
--- a/cpp/unittest/db/mysql_meta_test.cpp
+++ b/cpp/unittest/db/mysql_meta_test.cpp
@@ -15,7 +15,7 @@
 // specific language governing permissions and limitations
 // under the License.
 
-#include "utils.h"
+#include "db/utils.h"
 #include "db/meta/MySQLMetaImpl.h"
 #include "db/Utils.h"
 #include "db/meta/MetaConsts.h"
@@ -27,13 +27,17 @@
 #include <gtest/gtest.h>
 #include <mysql++/mysql++.h>
 
-using namespace zilliz::milvus;
-using namespace zilliz::milvus::engine;
+namespace {
+
+namespace ms = zilliz::milvus;
+
+}
+
 
 TEST_F(MySqlMetaTest, TABLE_TEST) {
     auto table_id = "meta_test_table";
 
-    meta::TableSchema table;
+    ms::engine::meta::TableSchema table;
     table.table_id_ = table_id;
     auto status = impl_->CreateTable(table);
     ASSERT_TRUE(status.ok());
@@ -51,7 +55,7 @@ TEST_F(MySqlMetaTest, TABLE_TEST) {
 
     table.table_id_ = table_id;
     status = impl_->CreateTable(table);
-    ASSERT_EQ(status.code(), DB_ALREADY_EXIST);
+    ASSERT_EQ(status.code(), ms::DB_ALREADY_EXIST);
 
     table.table_id_ = "";
     status = impl_->CreateTable(table);
@@ -64,20 +68,19 @@ TEST_F(MySqlMetaTest, TABLE_TEST) {
 TEST_F(MySqlMetaTest, TABLE_FILE_TEST) {
     auto table_id = "meta_test_table";
 
-    meta::TableSchema table;
+    ms::engine::meta::TableSchema table;
     table.table_id_ = table_id;
     table.dimension_ = 256;
     auto status = impl_->CreateTable(table);
 
-
-    meta::TableFileSchema table_file;
+    ms::engine::meta::TableFileSchema table_file;
     table_file.table_id_ = table.table_id_;
     status = impl_->CreateTableFile(table_file);
     ASSERT_TRUE(status.ok());
-    ASSERT_EQ(table_file.file_type_, meta::TableFileSchema::NEW);
+    ASSERT_EQ(table_file.file_type_, ms::engine::meta::TableFileSchema::NEW);
 
-    meta::DatesT dates;
-    dates.push_back(utils::GetDate());
+    ms::engine::meta::DatesT dates;
+    dates.push_back(ms::engine::utils::GetDate());
     status = impl_->DropPartitionsByDates(table_file.table_id_, dates);
     ASSERT_TRUE(status.ok());
 
@@ -88,7 +91,7 @@ TEST_F(MySqlMetaTest, TABLE_FILE_TEST) {
 
     auto file_id = table_file.file_id_;
 
-    auto new_file_type = meta::TableFileSchema::INDEX;
+    auto new_file_type = ms::engine::meta::TableFileSchema::INDEX;
     table_file.file_type_ = new_file_type;
 
     status = impl_->UpdateTableFile(table_file);
@@ -96,17 +99,17 @@ TEST_F(MySqlMetaTest, TABLE_FILE_TEST) {
     ASSERT_EQ(table_file.file_type_, new_file_type);
 
     dates.clear();
-    for (auto i=2; i < 10; ++i) {
-        dates.push_back(utils::GetDateWithDelta(-1*i));
+    for (auto i = 2; i < 10; ++i) {
+        dates.push_back(ms::engine::utils::GetDateWithDelta(-1 * i));
     }
     status = impl_->DropPartitionsByDates(table_file.table_id_, dates);
     ASSERT_TRUE(status.ok());
 
-    table_file.date_ = utils::GetDateWithDelta(-2);
+    table_file.date_ = ms::engine::utils::GetDateWithDelta(-2);
     status = impl_->UpdateTableFile(table_file);
     ASSERT_TRUE(status.ok());
-    ASSERT_EQ(table_file.date_, utils::GetDateWithDelta(-2));
-    ASSERT_FALSE(table_file.file_type_ == meta::TableFileSchema::TO_DELETE);
+    ASSERT_EQ(table_file.date_, ms::engine::utils::GetDateWithDelta(-2));
+    ASSERT_FALSE(table_file.file_type_ == ms::engine::meta::TableFileSchema::TO_DELETE);
 
     dates.clear();
     dates.push_back(table_file.date_);
@@ -114,41 +117,42 @@ TEST_F(MySqlMetaTest, TABLE_FILE_TEST) {
     ASSERT_TRUE(status.ok());
 
     std::vector<size_t> ids = {table_file.id_};
-    meta::TableFilesSchema files;
+    ms::engine::meta::TableFilesSchema files;
     status = impl_->GetTableFiles(table_file.table_id_, ids, files);
     ASSERT_EQ(files.size(), 0UL);
 }
 
 TEST_F(MySqlMetaTest, ARCHIVE_TEST_DAYS) {
     srand(time(0));
-    DBMetaOptions options = GetOptions().meta_;
+    ms::engine::DBMetaOptions options = GetOptions().meta_;
 
-    int days_num = rand() % 100;
+    unsigned int seed = 1;
+    int days_num = rand_r(&seed) % 100;
     std::stringstream ss;
     ss << "days:" << days_num;
-    options.archive_conf_ = ArchiveConf("delete", ss.str());
-    int mode = DBOptions::MODE::SINGLE;
-    meta::MySQLMetaImpl impl(options, mode);
+    options.archive_conf_ = ms::engine::ArchiveConf("delete", ss.str());
+    int mode = ms::engine::DBOptions::MODE::SINGLE;
+    ms::engine::meta::MySQLMetaImpl impl(options, mode);
 
     auto table_id = "meta_test_table";
 
-    meta::TableSchema table;
+    ms::engine::meta::TableSchema table;
     table.table_id_ = table_id;
     auto status = impl.CreateTable(table);
 
-    meta::TableFilesSchema files;
-    meta::TableFileSchema table_file;
+    ms::engine::meta::TableFilesSchema files;
+    ms::engine::meta::TableFileSchema table_file;
     table_file.table_id_ = table.table_id_;
 
     auto cnt = 100;
-    long ts = utils::GetMicroSecTimeStamp();
+    int64_t ts = ms::engine::utils::GetMicroSecTimeStamp();
     std::vector<int> days;
     std::vector<size_t> ids;
-    for (auto i=0; i<cnt; ++i) {
+    for (auto i = 0; i < cnt; ++i) {
         status = impl.CreateTableFile(table_file);
-        table_file.file_type_ = meta::TableFileSchema::NEW;
-        int day = rand() % (days_num*2);
-        table_file.created_on_ = ts - day*meta::D_SEC*meta::US_PS - 10000;
+        table_file.file_type_ = ms::engine::meta::TableFileSchema::NEW;
+        int day = rand_r(&seed) % (days_num * 2);
+        table_file.created_on_ = ts - day * ms::engine::meta::D_SEC * ms::engine::meta::US_PS - 10000;
         status = impl.UpdateTableFile(table_file);
         files.push_back(table_file);
         days.push_back(day);
@@ -158,19 +162,19 @@ TEST_F(MySqlMetaTest, ARCHIVE_TEST_DAYS) {
     impl.Archive();
     int i = 0;
 
-    meta::TableFilesSchema files_get;
+    ms::engine::meta::TableFilesSchema files_get;
     status = impl.GetTableFiles(table_file.table_id_, ids, files_get);
     ASSERT_TRUE(status.ok());
 
-    for(auto& file : files_get) {
+    for (auto &file : files_get) {
         if (days[i] < days_num) {
-            ASSERT_EQ(file.file_type_, meta::TableFileSchema::NEW);
+            ASSERT_EQ(file.file_type_, ms::engine::meta::TableFileSchema::NEW);
         }
         i++;
     }
 
     std::vector<int> file_types = {
-        (int) meta::TableFileSchema::NEW,
+        (int) ms::engine::meta::TableFileSchema::NEW,
     };
     std::vector<std::string> file_ids;
     status = impl.FilesByType(table_id, file_types, file_ids);
@@ -184,32 +188,32 @@ TEST_F(MySqlMetaTest, ARCHIVE_TEST_DAYS) {
 }
 
 TEST_F(MySqlMetaTest, ARCHIVE_TEST_DISK) {
-    DBMetaOptions options = GetOptions().meta_;
+    ms::engine::DBMetaOptions options = GetOptions().meta_;
 
-    options.archive_conf_ = ArchiveConf("delete", "disk:11");
-    int mode = DBOptions::MODE::SINGLE;
-    auto impl = meta::MySQLMetaImpl(options, mode);
+    options.archive_conf_ = ms::engine::ArchiveConf("delete", "disk:11");
+    int mode = ms::engine::DBOptions::MODE::SINGLE;
+    auto impl = ms::engine::meta::MySQLMetaImpl(options, mode);
     auto table_id = "meta_test_group";
 
-    meta::TableSchema table;
+    ms::engine::meta::TableSchema table;
     table.table_id_ = table_id;
     auto status = impl.CreateTable(table);
 
-    meta::TableSchema table_schema;
+    ms::engine::meta::TableSchema table_schema;
     table_schema.table_id_ = "";
     status = impl.CreateTable(table_schema);
 
-    meta::TableFilesSchema files;
-    meta::TableFileSchema table_file;
+    ms::engine::meta::TableFilesSchema files;
+    ms::engine::meta::TableFileSchema table_file;
     table_file.table_id_ = table.table_id_;
 
     auto cnt = 10;
     auto each_size = 2UL;
     std::vector<size_t> ids;
-    for (auto i=0; i<cnt; ++i) {
+    for (auto i = 0; i < cnt; ++i) {
         status = impl.CreateTableFile(table_file);
-        table_file.file_type_ = meta::TableFileSchema::NEW;
-        table_file.file_size_ = each_size * meta::G;
+        table_file.file_type_ = ms::engine::meta::TableFileSchema::NEW;
+        table_file.file_size_ = each_size * ms::engine::meta::G;
         status = impl.UpdateTableFile(table_file);
         files.push_back(table_file);
         ids.push_back(table_file.id_);
@@ -218,13 +222,13 @@ TEST_F(MySqlMetaTest, ARCHIVE_TEST_DISK) {
     impl.Archive();
     int i = 0;
 
-    meta::TableFilesSchema files_get;
+    ms::engine::meta::TableFilesSchema files_get;
     status = impl.GetTableFiles(table_file.table_id_, ids, files_get);
     ASSERT_TRUE(status.ok());
 
-    for(auto& file : files_get) {
+    for (auto &file : files_get) {
         if (i >= 5) {
-            ASSERT_EQ(file.file_type_, meta::TableFileSchema::NEW);
+            ASSERT_EQ(file.file_type_, ms::engine::meta::TableFileSchema::NEW);
         }
         ++i;
     }
@@ -236,7 +240,7 @@ TEST_F(MySqlMetaTest, ARCHIVE_TEST_DISK) {
 TEST_F(MySqlMetaTest, TABLE_FILES_TEST) {
     auto table_id = "meta_test_group";
 
-    meta::TableSchema table;
+    ms::engine::meta::TableSchema table;
     table.table_id_ = table_id;
     auto status = impl_->CreateTable(table);
 
@@ -248,51 +252,51 @@ TEST_F(MySqlMetaTest, TABLE_FILES_TEST) {
     uint64_t to_index_files_cnt = 6;
     uint64_t index_files_cnt = 7;
 
-    meta::TableFileSchema table_file;
+    ms::engine::meta::TableFileSchema table_file;
     table_file.table_id_ = table.table_id_;
 
-    for (auto i=0; i<new_merge_files_cnt; ++i) {
+    for (auto i = 0; i < new_merge_files_cnt; ++i) {
         status = impl_->CreateTableFile(table_file);
-        table_file.file_type_ = meta::TableFileSchema::NEW_MERGE;
+        table_file.file_type_ = ms::engine::meta::TableFileSchema::NEW_MERGE;
         status = impl_->UpdateTableFile(table_file);
     }
 
-    for (auto i=0; i<new_index_files_cnt; ++i) {
+    for (auto i = 0; i < new_index_files_cnt; ++i) {
         status = impl_->CreateTableFile(table_file);
-        table_file.file_type_ = meta::TableFileSchema::NEW_INDEX;
+        table_file.file_type_ = ms::engine::meta::TableFileSchema::NEW_INDEX;
         status = impl_->UpdateTableFile(table_file);
     }
 
-    for (auto i=0; i<backup_files_cnt; ++i) {
+    for (auto i = 0; i < backup_files_cnt; ++i) {
         status = impl_->CreateTableFile(table_file);
-        table_file.file_type_ = meta::TableFileSchema::BACKUP;
+        table_file.file_type_ = ms::engine::meta::TableFileSchema::BACKUP;
         table_file.row_count_ = 1;
         status = impl_->UpdateTableFile(table_file);
     }
 
-    for (auto i=0; i<new_files_cnt; ++i) {
+    for (auto i = 0; i < new_files_cnt; ++i) {
         status = impl_->CreateTableFile(table_file);
-        table_file.file_type_ = meta::TableFileSchema::NEW;
+        table_file.file_type_ = ms::engine::meta::TableFileSchema::NEW;
         status = impl_->UpdateTableFile(table_file);
     }
 
-    for (auto i=0; i<raw_files_cnt; ++i) {
+    for (auto i = 0; i < raw_files_cnt; ++i) {
         status = impl_->CreateTableFile(table_file);
-        table_file.file_type_ = meta::TableFileSchema::RAW;
+        table_file.file_type_ = ms::engine::meta::TableFileSchema::RAW;
         table_file.row_count_ = 1;
         status = impl_->UpdateTableFile(table_file);
     }
 
-    for (auto i=0; i<to_index_files_cnt; ++i) {
+    for (auto i = 0; i < to_index_files_cnt; ++i) {
         status = impl_->CreateTableFile(table_file);
-        table_file.file_type_ = meta::TableFileSchema::TO_INDEX;
+        table_file.file_type_ = ms::engine::meta::TableFileSchema::TO_INDEX;
         table_file.row_count_ = 1;
         status = impl_->UpdateTableFile(table_file);
     }
 
-    for (auto i=0; i<index_files_cnt; ++i) {
+    for (auto i = 0; i < index_files_cnt; ++i) {
         status = impl_->CreateTableFile(table_file);
-        table_file.file_type_ = meta::TableFileSchema::INDEX;
+        table_file.file_type_ = ms::engine::meta::TableFileSchema::INDEX;
         table_file.row_count_ = 1;
         status = impl_->UpdateTableFile(table_file);
     }
@@ -300,36 +304,36 @@ TEST_F(MySqlMetaTest, TABLE_FILES_TEST) {
     uint64_t total_row_count = 0;
     status = impl_->Count(table_id, total_row_count);
     ASSERT_TRUE(status.ok());
-    ASSERT_EQ(total_row_count, raw_files_cnt+to_index_files_cnt+index_files_cnt);
+    ASSERT_EQ(total_row_count, raw_files_cnt + to_index_files_cnt + index_files_cnt);
 
-    meta::TableFilesSchema files;
+    ms::engine::meta::TableFilesSchema files;
     status = impl_->FilesToIndex(files);
     ASSERT_EQ(files.size(), to_index_files_cnt);
 
-    meta::DatePartionedTableFilesSchema dated_files;
+    ms::engine::meta::DatePartionedTableFilesSchema dated_files;
     status = impl_->FilesToMerge(table.table_id_, dated_files);
     ASSERT_EQ(dated_files[table_file.date_].size(), raw_files_cnt);
 
     status = impl_->FilesToIndex(files);
     ASSERT_EQ(files.size(), to_index_files_cnt);
 
-    meta::DatesT dates = {table_file.date_};
+    ms::engine::meta::DatesT dates = {table_file.date_};
     std::vector<size_t> ids;
     status = impl_->FilesToSearch(table_id, ids, dates, dated_files);
     ASSERT_EQ(dated_files[table_file.date_].size(),
-              to_index_files_cnt+raw_files_cnt+index_files_cnt);
+              to_index_files_cnt + raw_files_cnt + index_files_cnt);
 
-    status = impl_->FilesToSearch(table_id, ids, meta::DatesT(), dated_files);
+    status = impl_->FilesToSearch(table_id, ids, ms::engine::meta::DatesT(), dated_files);
     ASSERT_EQ(dated_files[table_file.date_].size(),
-              to_index_files_cnt+raw_files_cnt+index_files_cnt);
+              to_index_files_cnt + raw_files_cnt + index_files_cnt);
 
-    status = impl_->FilesToSearch(table_id, ids, meta::DatesT(), dated_files);
+    status = impl_->FilesToSearch(table_id, ids, ms::engine::meta::DatesT(), dated_files);
     ASSERT_EQ(dated_files[table_file.date_].size(),
-              to_index_files_cnt+raw_files_cnt+index_files_cnt);
+              to_index_files_cnt + raw_files_cnt + index_files_cnt);
 
     ids.push_back(size_t(9999999999));
     status = impl_->FilesToSearch(table_id, ids, dates, dated_files);
-    ASSERT_EQ(dated_files[table_file.date_].size(),0);
+    ASSERT_EQ(dated_files[table_file.date_].size(), 0);
 
     std::vector<int> file_types;
     std::vector<std::string> file_ids;
@@ -338,19 +342,19 @@ TEST_F(MySqlMetaTest, TABLE_FILES_TEST) {
     ASSERT_FALSE(status.ok());
 
     file_types = {
-            meta::TableFileSchema::NEW,
-            meta::TableFileSchema::NEW_MERGE,
-            meta::TableFileSchema::NEW_INDEX,
-            meta::TableFileSchema::TO_INDEX,
-            meta::TableFileSchema::INDEX,
-            meta::TableFileSchema::RAW,
-            meta::TableFileSchema::BACKUP,
+        ms::engine::meta::TableFileSchema::NEW,
+        ms::engine::meta::TableFileSchema::NEW_MERGE,
+        ms::engine::meta::TableFileSchema::NEW_INDEX,
+        ms::engine::meta::TableFileSchema::TO_INDEX,
+        ms::engine::meta::TableFileSchema::INDEX,
+        ms::engine::meta::TableFileSchema::RAW,
+        ms::engine::meta::TableFileSchema::BACKUP,
     };
     status = impl_->FilesByType(table.table_id_, file_types, file_ids);
     ASSERT_TRUE(status.ok());
     uint64_t total_cnt = new_index_files_cnt + new_merge_files_cnt +
-            backup_files_cnt + new_files_cnt + raw_files_cnt +
-            to_index_files_cnt + index_files_cnt;
+        backup_files_cnt + new_files_cnt + raw_files_cnt +
+        to_index_files_cnt + index_files_cnt;
     ASSERT_EQ(file_ids.size(), total_cnt);
 
     status = impl_->DeleteTableFiles(table_id);
@@ -366,11 +370,11 @@ TEST_F(MySqlMetaTest, TABLE_FILES_TEST) {
 TEST_F(MySqlMetaTest, INDEX_TEST) {
     auto table_id = "index_test";
 
-    meta::TableSchema table;
+    ms::engine::meta::TableSchema table;
     table.table_id_ = table_id;
     auto status = impl_->CreateTable(table);
 
-    TableIndex index;
+    ms::engine::TableIndex index;
     index.metric_type_ = 2;
     index.nlist_ = 1234;
     index.engine_type_ = 3;
@@ -381,12 +385,12 @@ TEST_F(MySqlMetaTest, INDEX_TEST) {
     status = impl_->UpdateTableFlag(table_id, flag);
     ASSERT_TRUE(status.ok());
 
-    engine::meta::TableSchema table_info;
+    ms::engine::meta::TableSchema table_info;
     table_info.table_id_ = table_id;
     status = impl_->DescribeTable(table_info);
     ASSERT_EQ(table_info.flag_, flag);
 
-    TableIndex index_out;
+    ms::engine::TableIndex index_out;
     status = impl_->DescribeTableIndex(table_id, index_out);
     ASSERT_EQ(index_out.metric_type_, index.metric_type_);
     ASSERT_EQ(index_out.nlist_, index.nlist_);
diff --git a/cpp/unittest/db/search_test.cpp b/cpp/unittest/db/search_test.cpp
index 33917ea1b7..d0d55a11c6 100644
--- a/cpp/unittest/db/search_test.cpp
+++ b/cpp/unittest/db/search_test.cpp
@@ -22,53 +22,55 @@
 #include "scheduler/task/SearchTask.h"
 #include "utils/TimeRecorder.h"
 
-using namespace zilliz::milvus;
-
 namespace {
 
+namespace ms = zilliz::milvus;
+
 static constexpr uint64_t NQ = 15;
 static constexpr uint64_t TOP_K = 64;
 
-void BuildResult(uint64_t nq,
-                 uint64_t topk,
-                 bool ascending,
-                 std::vector<long> &output_ids,
-                 std::vector<float> &output_distence) {
+void
+BuildResult(uint64_t nq,
+            uint64_t topk,
+            bool ascending,
+            std::vector<int64_t> &output_ids,
+            std::vector<float> &output_distence) {
     output_ids.clear();
-    output_ids.resize(nq*topk);
+    output_ids.resize(nq * topk);
     output_distence.clear();
-    output_distence.resize(nq*topk);
+    output_distence.resize(nq * topk);
 
-    for(uint64_t i = 0; i < nq; i++) {
-        for(uint64_t j = 0; j < topk; j++) {
-            output_ids[i * topk + j] = (long)(drand48()*100000);
+    for (uint64_t i = 0; i < nq; i++) {
+        for (uint64_t j = 0; j < topk; j++) {
+            output_ids[i * topk + j] = (int64_t) (drand48() * 100000);
             output_distence[i * topk + j] = ascending ? (j + drand48()) : ((topk - j) + drand48());
         }
     }
 }
 
-void CheckResult(const scheduler::Id2DistanceMap& src_1,
-        const scheduler::Id2DistanceMap& src_2,
-        const scheduler::Id2DistanceMap& target,
-        bool ascending) {
-    for(uint64_t i = 0; i < target.size() - 1; i++) {
-        if(ascending) {
+void
+CheckResult(const ms::scheduler::Id2DistanceMap &src_1,
+            const ms::scheduler::Id2DistanceMap &src_2,
+            const ms::scheduler::Id2DistanceMap &target,
+            bool ascending) {
+    for (uint64_t i = 0; i < target.size() - 1; i++) {
+        if (ascending) {
             ASSERT_LE(target[i].second, target[i + 1].second);
         } else {
             ASSERT_GE(target[i].second, target[i + 1].second);
         }
     }
 
-    using ID2DistMap = std::map<long, float>;
+    using ID2DistMap = std::map<int64_t, float>;
     ID2DistMap src_map_1, src_map_2;
-    for(const auto& pair : src_1) {
+    for (const auto &pair : src_1) {
         src_map_1.insert(pair);
     }
-    for(const auto& pair : src_2) {
+    for (const auto &pair : src_2) {
         src_map_2.insert(pair);
     }
 
-    for(const auto& pair : target) {
+    for (const auto &pair : target) {
         ASSERT_TRUE(src_map_1.find(pair.first) != src_map_1.end() || src_map_2.find(pair.first) != src_map_2.end());
 
         float dist = src_map_1.find(pair.first) != src_map_1.end() ? src_map_1[pair.first] : src_map_2[pair.first];
@@ -76,40 +78,42 @@ void CheckResult(const scheduler::Id2DistanceMap& src_1,
     }
 }
 
-void CheckCluster(const std::vector<long>& target_ids,
-        const std::vector<float>& target_distence,
-        const scheduler::ResultSet& src_result,
-        int64_t nq,
-        int64_t topk) {
+void
+CheckCluster(const std::vector<int64_t> &target_ids,
+             const std::vector<float> &target_distence,
+             const ms::scheduler::ResultSet &src_result,
+             int64_t nq,
+             int64_t topk) {
     ASSERT_EQ(src_result.size(), nq);
-    for(int64_t i = 0; i < nq; i++) {
-        auto& res = src_result[i];
+    for (int64_t i = 0; i < nq; i++) {
+        auto &res = src_result[i];
         ASSERT_EQ(res.size(), topk);
 
-        if(res.empty()) {
+        if (res.empty()) {
             continue;
         }
 
-        ASSERT_EQ(res[0].first, target_ids[i*topk]);
-        ASSERT_EQ(res[topk - 1].first, target_ids[i*topk + topk - 1]);
+        ASSERT_EQ(res[0].first, target_ids[i * topk]);
+        ASSERT_EQ(res[topk - 1].first, target_ids[i * topk + topk - 1]);
     }
 }
 
-void CheckTopkResult(const scheduler::ResultSet& src_result,
-                     bool ascending,
-                     int64_t nq,
-                     int64_t topk) {
+void
+CheckTopkResult(const ms::scheduler::ResultSet &src_result,
+                bool ascending,
+                int64_t nq,
+                int64_t topk) {
     ASSERT_EQ(src_result.size(), nq);
-    for(int64_t i = 0; i < nq; i++) {
-        auto& res = src_result[i];
+    for (int64_t i = 0; i < nq; i++) {
+        auto &res = src_result[i];
         ASSERT_EQ(res.size(), topk);
 
-        if(res.empty()) {
+        if (res.empty()) {
             continue;
         }
 
-        for(int64_t k = 0; k < topk - 1; k++) {
-            if(ascending) {
+        for (int64_t k = 0; k < topk - 1; k++) {
+            if (ascending) {
                 ASSERT_LE(res[k].second, res[k + 1].second);
             } else {
                 ASSERT_GE(res[k].second, res[k + 1].second);
@@ -118,87 +122,87 @@ void CheckTopkResult(const scheduler::ResultSet& src_result,
     }
 }
 
-}
+} // namespace
 
 TEST(DBSearchTest, TOPK_TEST) {
     bool ascending = true;
-    std::vector<long> target_ids;
+    std::vector<int64_t> target_ids;
     std::vector<float> target_distence;
-    scheduler::ResultSet src_result;
-    auto status = scheduler::XSearchTask::ClusterResult(target_ids, target_distence, NQ, TOP_K, src_result);
+    ms::scheduler::ResultSet src_result;
+    auto status = ms::scheduler::XSearchTask::ClusterResult(target_ids, target_distence, NQ, TOP_K, src_result);
     ASSERT_FALSE(status.ok());
     ASSERT_TRUE(src_result.empty());
 
     BuildResult(NQ, TOP_K, ascending, target_ids, target_distence);
-    status = scheduler::XSearchTask::ClusterResult(target_ids, target_distence, NQ, TOP_K, src_result);
+    status = ms::scheduler::XSearchTask::ClusterResult(target_ids, target_distence, NQ, TOP_K, src_result);
     ASSERT_TRUE(status.ok());
     ASSERT_EQ(src_result.size(), NQ);
 
-    scheduler::ResultSet target_result;
-    status = scheduler::XSearchTask::TopkResult(target_result, TOP_K, ascending, target_result);
+    ms::scheduler::ResultSet target_result;
+    status = ms::scheduler::XSearchTask::TopkResult(target_result, TOP_K, ascending, target_result);
     ASSERT_TRUE(status.ok());
 
-    status = scheduler::XSearchTask::TopkResult(target_result, TOP_K, ascending, src_result);
+    status = ms::scheduler::XSearchTask::TopkResult(target_result, TOP_K, ascending, src_result);
     ASSERT_FALSE(status.ok());
 
-    status = scheduler::XSearchTask::TopkResult(src_result, TOP_K, ascending, target_result);
+    status = ms::scheduler::XSearchTask::TopkResult(src_result, TOP_K, ascending, target_result);
     ASSERT_TRUE(status.ok());
     ASSERT_TRUE(src_result.empty());
     ASSERT_EQ(target_result.size(), NQ);
 
-    std::vector<long> src_ids;
+    std::vector<int64_t> src_ids;
     std::vector<float> src_distence;
     uint64_t wrong_topk = TOP_K - 10;
     BuildResult(NQ, wrong_topk, ascending, src_ids, src_distence);
 
-    status = scheduler::XSearchTask::ClusterResult(src_ids, src_distence, NQ, wrong_topk, src_result);
+    status = ms::scheduler::XSearchTask::ClusterResult(src_ids, src_distence, NQ, wrong_topk, src_result);
     ASSERT_TRUE(status.ok());
 
-    status = scheduler::XSearchTask::TopkResult(src_result, TOP_K, ascending, target_result);
+    status = ms::scheduler::XSearchTask::TopkResult(src_result, TOP_K, ascending, target_result);
     ASSERT_TRUE(status.ok());
-    for(uint64_t i = 0; i < NQ; i++) {
+    for (uint64_t i = 0; i < NQ; i++) {
         ASSERT_EQ(target_result[i].size(), TOP_K);
     }
 
     wrong_topk = TOP_K + 10;
     BuildResult(NQ, wrong_topk, ascending, src_ids, src_distence);
 
-    status = scheduler::XSearchTask::TopkResult(src_result, TOP_K, ascending, target_result);
+    status = ms::scheduler::XSearchTask::TopkResult(src_result, TOP_K, ascending, target_result);
     ASSERT_TRUE(status.ok());
-    for(uint64_t i = 0; i < NQ; i++) {
+    for (uint64_t i = 0; i < NQ; i++) {
         ASSERT_EQ(target_result[i].size(), TOP_K);
     }
 }
 
 TEST(DBSearchTest, MERGE_TEST) {
     bool ascending = true;
-    std::vector<long> target_ids;
+    std::vector<int64_t> target_ids;
     std::vector<float> target_distence;
-    std::vector<long> src_ids;
+    std::vector<int64_t> src_ids;
     std::vector<float> src_distence;
-    scheduler::ResultSet src_result, target_result;
+    ms::scheduler::ResultSet src_result, target_result;
 
     uint64_t src_count = 5, target_count = 8;
     BuildResult(1, src_count, ascending, src_ids, src_distence);
     BuildResult(1, target_count, ascending, target_ids, target_distence);
-    auto status = scheduler::XSearchTask::ClusterResult(src_ids, src_distence, 1, src_count, src_result);
+    auto status = ms::scheduler::XSearchTask::ClusterResult(src_ids, src_distence, 1, src_count, src_result);
     ASSERT_TRUE(status.ok());
-    status = scheduler::XSearchTask::ClusterResult(target_ids, target_distence, 1, target_count, target_result);
+    status = ms::scheduler::XSearchTask::ClusterResult(target_ids, target_distence, 1, target_count, target_result);
     ASSERT_TRUE(status.ok());
 
     {
-        scheduler::Id2DistanceMap src = src_result[0];
-        scheduler::Id2DistanceMap target = target_result[0];
-        status = scheduler::XSearchTask::MergeResult(src, target, 10, ascending);
+        ms::scheduler::Id2DistanceMap src = src_result[0];
+        ms::scheduler::Id2DistanceMap target = target_result[0];
+        status = ms::scheduler::XSearchTask::MergeResult(src, target, 10, ascending);
         ASSERT_TRUE(status.ok());
         ASSERT_EQ(target.size(), 10);
         CheckResult(src_result[0], target_result[0], target, ascending);
     }
 
     {
-        scheduler::Id2DistanceMap src = src_result[0];
-        scheduler::Id2DistanceMap target;
-        status = scheduler::XSearchTask::MergeResult(src, target, 10, ascending);
+        ms::scheduler::Id2DistanceMap src = src_result[0];
+        ms::scheduler::Id2DistanceMap target;
+        status = ms::scheduler::XSearchTask::MergeResult(src, target, 10, ascending);
         ASSERT_TRUE(status.ok());
         ASSERT_EQ(target.size(), src_count);
         ASSERT_TRUE(src.empty());
@@ -206,18 +210,18 @@ TEST(DBSearchTest, MERGE_TEST) {
     }
 
     {
-        scheduler::Id2DistanceMap src = src_result[0];
-        scheduler::Id2DistanceMap target = target_result[0];
-        status = scheduler::XSearchTask::MergeResult(src, target, 30, ascending);
+        ms::scheduler::Id2DistanceMap src = src_result[0];
+        ms::scheduler::Id2DistanceMap target = target_result[0];
+        status = ms::scheduler::XSearchTask::MergeResult(src, target, 30, ascending);
         ASSERT_TRUE(status.ok());
         ASSERT_EQ(target.size(), src_count + target_count);
         CheckResult(src_result[0], target_result[0], target, ascending);
     }
 
     {
-        scheduler::Id2DistanceMap target = src_result[0];
-        scheduler::Id2DistanceMap src = target_result[0];
-        status = scheduler::XSearchTask::MergeResult(src, target, 30, ascending);
+        ms::scheduler::Id2DistanceMap target = src_result[0];
+        ms::scheduler::Id2DistanceMap src = target_result[0];
+        status = ms::scheduler::XSearchTask::MergeResult(src, target, 30, ascending);
         ASSERT_TRUE(status.ok());
         ASSERT_EQ(target.size(), src_count + target_count);
         CheckResult(src_result[0], target_result[0], target, ascending);
@@ -226,17 +230,17 @@ TEST(DBSearchTest, MERGE_TEST) {
 
 TEST(DBSearchTest, PARALLEL_CLUSTER_TEST) {
     bool ascending = true;
-    std::vector<long> target_ids;
+    std::vector<int64_t> target_ids;
     std::vector<float> target_distence;
-    scheduler::ResultSet src_result;
+    ms::scheduler::ResultSet src_result;
 
     auto DoCluster = [&](int64_t nq, int64_t topk) {
-        TimeRecorder rc("DoCluster");
+        ms::TimeRecorder rc("DoCluster");
         src_result.clear();
         BuildResult(nq, topk, ascending, target_ids, target_distence);
         rc.RecordSection("build id/dietance map");
 
-        auto status = scheduler::XSearchTask::ClusterResult(target_ids, target_distence, nq, topk, src_result);
+        auto status = ms::scheduler::XSearchTask::ClusterResult(target_ids, target_distence, nq, topk, src_result);
         ASSERT_TRUE(status.ok());
         ASSERT_EQ(src_result.size(), nq);
 
@@ -257,29 +261,33 @@ TEST(DBSearchTest, PARALLEL_CLUSTER_TEST) {
 }
 
 TEST(DBSearchTest, PARALLEL_TOPK_TEST) {
-    std::vector<long> target_ids;
+    std::vector<int64_t> target_ids;
     std::vector<float> target_distence;
-    scheduler::ResultSet src_result;
+    ms::scheduler::ResultSet src_result;
 
-    std::vector<long> insufficient_ids;
+    std::vector<int64_t> insufficient_ids;
     std::vector<float> insufficient_distence;
-    scheduler::ResultSet insufficient_result;
+    ms::scheduler::ResultSet insufficient_result;
 
-    auto DoTopk = [&](int64_t nq, int64_t topk,int64_t insufficient_topk, bool ascending) {
+    auto DoTopk = [&](int64_t nq, int64_t topk, int64_t insufficient_topk, bool ascending) {
         src_result.clear();
         insufficient_result.clear();
 
-        TimeRecorder rc("DoCluster");
+        ms::TimeRecorder rc("DoCluster");
 
         BuildResult(nq, topk, ascending, target_ids, target_distence);
-        auto status = scheduler::XSearchTask::ClusterResult(target_ids, target_distence, nq, topk, src_result);
+        auto status = ms::scheduler::XSearchTask::ClusterResult(target_ids, target_distence, nq, topk, src_result);
         rc.RecordSection("cluster result");
 
         BuildResult(nq, insufficient_topk, ascending, insufficient_ids, insufficient_distence);
-        status = scheduler::XSearchTask::ClusterResult(target_ids, target_distence, nq, insufficient_topk, insufficient_result);
+        status = ms::scheduler::XSearchTask::ClusterResult(target_ids,
+                                                           target_distence,
+                                                           nq,
+                                                           insufficient_topk,
+                                                           insufficient_result);
         rc.RecordSection("cluster result");
 
-        scheduler::XSearchTask::TopkResult(insufficient_result, topk, ascending, src_result);
+        ms::scheduler::XSearchTask::TopkResult(insufficient_result, topk, ascending, src_result);
         ASSERT_TRUE(status.ok());
         rc.RecordSection("topk");
 
@@ -292,4 +300,4 @@ TEST(DBSearchTest, PARALLEL_TOPK_TEST) {
 //    DoTopk(9987, 12, 10, false);
 //    DoTopk(77777, 1000, 1, false);
 //    DoTopk(5432, 8899, 8899, true);
-}
\ No newline at end of file
+}
diff --git a/cpp/unittest/db/utils.cpp b/cpp/unittest/db/utils.cpp
index 08e3c8f090..2ad7c4f743 100644
--- a/cpp/unittest/db/utils.cpp
+++ b/cpp/unittest/db/utils.cpp
@@ -18,9 +18,11 @@
 
 #include <iostream>
 #include <thread>
+#include <memory>
+#include <string>
 #include <boost/filesystem.hpp>
 
-#include "utils.h"
+#include "db/utils.h"
 #include "cache/GpuCacheMgr.h"
 #include "cache/CpuCacheMgr.h"
 #include "db/DBFactory.h"
@@ -29,83 +31,98 @@
 
 INITIALIZE_EASYLOGGINGPP
 
-using namespace zilliz::milvus;
+namespace {
 
-static std::string uri;
+namespace ms = zilliz::milvus;
 
 class DBTestEnvironment : public ::testing::Environment {
-public:
+ public:
+    explicit DBTestEnvironment(const std::string& uri)
+        : uri_(uri) {
+    }
 
-//    explicit DBTestEnvironment(std::string uri) : uri_(uri) {}
-
-    static std::string getURI() {
-        return uri;
+    std::string getURI() const {
+        return uri_;
     }
 
     void SetUp() override {
         getURI();
     }
 
+ private:
+    std::string uri_;
 };
 
+DBTestEnvironment* test_env = nullptr;
+
+} // namespace
+
+
+
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////
-void BaseTest::InitLog() {
+void
+BaseTest::InitLog() {
     el::Configurations defaultConf;
     defaultConf.setToDefault();
     defaultConf.set(el::Level::Debug,
-            el::ConfigurationType::Format, "[%thread-%datetime-%level]: %msg (%fbase:%line)");
+                    el::ConfigurationType::Format, "[%thread-%datetime-%level]: %msg (%fbase:%line)");
     el::Loggers::reconfigureLogger("default", defaultConf);
 }
 
-void BaseTest::SetUp() {
+void
+BaseTest::SetUp() {
     InitLog();
 
-    zilliz::knowhere::FaissGpuResourceMgr::GetInstance().InitDevice(0, 1024*1024*200, 1024*1024*300, 2);
+    zilliz::knowhere::FaissGpuResourceMgr::GetInstance().InitDevice(0, 1024 * 1024 * 200, 1024 * 1024 * 300, 2);
 }
 
-void BaseTest::TearDown() {
+void
+BaseTest::TearDown() {
     zilliz::milvus::cache::CpuCacheMgr::GetInstance()->ClearCache();
     zilliz::milvus::cache::GpuCacheMgr::GetInstance(0)->ClearCache();
     zilliz::knowhere::FaissGpuResourceMgr::GetInstance().Free();
 }
 
-engine::DBOptions BaseTest::GetOptions() {
-    auto options = engine::DBFactory::BuildOption();
+ms::engine::DBOptions
+BaseTest::GetOptions() {
+    auto options = ms::engine::DBFactory::BuildOption();
     options.meta_.path_ = "/tmp/milvus_test";
     options.meta_.backend_uri_ = "sqlite://:@:/";
     return options;
 }
 
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////
-void DBTest::SetUp() {
+void
+DBTest::SetUp() {
     BaseTest::SetUp();
 
-    auto res_mgr = scheduler::ResMgrInst::GetInstance();
+    auto res_mgr = ms::scheduler::ResMgrInst::GetInstance();
     res_mgr->Clear();
-    res_mgr->Add(scheduler::ResourceFactory::Create("disk", "DISK", 0, true, false));
-    res_mgr->Add(scheduler::ResourceFactory::Create("cpu", "CPU", 0, true, false));
-    res_mgr->Add(scheduler::ResourceFactory::Create("gtx1660", "GPU", 0, true, true));
+    res_mgr->Add(ms::scheduler::ResourceFactory::Create("disk", "DISK", 0, true, false));
+    res_mgr->Add(ms::scheduler::ResourceFactory::Create("cpu", "CPU", 0, true, false));
+    res_mgr->Add(ms::scheduler::ResourceFactory::Create("gtx1660", "GPU", 0, true, true));
 
-    auto default_conn = scheduler::Connection("IO", 500.0);
-    auto PCIE = scheduler::Connection("IO", 11000.0);
+    auto default_conn = ms::scheduler::Connection("IO", 500.0);
+    auto PCIE = ms::scheduler::Connection("IO", 11000.0);
     res_mgr->Connect("disk", "cpu", default_conn);
     res_mgr->Connect("cpu", "gtx1660", PCIE);
     res_mgr->Start();
-    scheduler::SchedInst::GetInstance()->Start();
+    ms::scheduler::SchedInst::GetInstance()->Start();
 
-    scheduler::JobMgrInst::GetInstance()->Start();
+    ms::scheduler::JobMgrInst::GetInstance()->Start();
 
     auto options = GetOptions();
-    db_ = engine::DBFactory::Build(options);
+    db_ = ms::engine::DBFactory::Build(options);
 }
 
-void DBTest::TearDown() {
+void
+DBTest::TearDown() {
     db_->Stop();
     db_->DropAll();
 
-    scheduler::JobMgrInst::GetInstance()->Stop();
-    scheduler::SchedInst::GetInstance()->Stop();
-    scheduler::ResMgrInst::GetInstance()->Stop();
+    ms::scheduler::JobMgrInst::GetInstance()->Stop();
+    ms::scheduler::SchedInst::GetInstance()->Stop();
+    ms::scheduler::ResMgrInst::GetInstance()->Stop();
 
     BaseTest::TearDown();
 
@@ -114,23 +131,26 @@ void DBTest::TearDown() {
 }
 
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////
-engine::DBOptions DBTest2::GetOptions() {
-    auto options = engine::DBFactory::BuildOption();
+ms::engine::DBOptions
+DBTest2::GetOptions() {
+    auto options = ms::engine::DBFactory::BuildOption();
     options.meta_.path_ = "/tmp/milvus_test";
-    options.meta_.archive_conf_ = engine::ArchiveConf("delete", "disk:1");
+    options.meta_.archive_conf_ = ms::engine::ArchiveConf("delete", "disk:1");
     options.meta_.backend_uri_ = "sqlite://:@:/";
     return options;
 }
 
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////
-void MetaTest::SetUp() {
+void
+MetaTest::SetUp() {
     BaseTest::SetUp();
 
     auto options = GetOptions();
-    impl_ = std::make_shared<engine::meta::SqliteMetaImpl>(options.meta_);
+    impl_ = std::make_shared<ms::engine::meta::SqliteMetaImpl>(options.meta_);
 }
 
-void MetaTest::TearDown() {
+void
+MetaTest::TearDown() {
     impl_->DropAll();
 
     BaseTest::TearDown();
@@ -140,27 +160,26 @@ void MetaTest::TearDown() {
 }
 
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////
-engine::DBOptions MySqlDBTest::GetOptions() {
-    auto options = engine::DBFactory::BuildOption();
+ms::engine::DBOptions
+MySqlDBTest::GetOptions() {
+    auto options = ms::engine::DBFactory::BuildOption();
     options.meta_.path_ = "/tmp/milvus_test";
-    options.meta_.backend_uri_ = DBTestEnvironment::getURI();
-
-    if(options.meta_.backend_uri_.empty()) {
-        options.meta_.backend_uri_ = "mysql://root:Fantast1c@192.168.1.194:3306/";
-    }
+    options.meta_.backend_uri_ = test_env->getURI();
 
     return options;
 }
 
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////
-void MySqlMetaTest::SetUp() {
+void
+MySqlMetaTest::SetUp() {
     BaseTest::SetUp();
 
     auto options = GetOptions();
-    impl_ = std::make_shared<engine::meta::MySQLMetaImpl>(options.meta_, options.mode_);
+    impl_ = std::make_shared<ms::engine::meta::MySQLMetaImpl>(options.meta_, options.mode_);
 }
 
-void MySqlMetaTest::TearDown() {
+void
+MySqlMetaTest::TearDown() {
     impl_->DropAll();
 
     BaseTest::TearDown();
@@ -169,29 +188,26 @@ void MySqlMetaTest::TearDown() {
     boost::filesystem::remove_all(options.meta_.path_);
 }
 
-engine::DBOptions MySqlMetaTest::GetOptions() {
-    auto options = engine::DBFactory::BuildOption();
+ms::engine::DBOptions
+MySqlMetaTest::GetOptions() {
+    auto options = ms::engine::DBFactory::BuildOption();
     options.meta_.path_ = "/tmp/milvus_test";
-    options.meta_.backend_uri_ = DBTestEnvironment::getURI();
-
-    if(options.meta_.backend_uri_.empty()) {
-        options.meta_.backend_uri_ = "mysql://root:Fantast1c@192.168.1.194:3306/";
-    }
+    options.meta_.backend_uri_ = test_env->getURI();
 
     return options;
 }
 
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////
-int main(int argc, char **argv) {
+int
+main(int argc, char **argv) {
     ::testing::InitGoogleTest(&argc, argv);
+
+    std::string uri;
     if (argc > 1) {
         uri = argv[1];
     }
 
-//    if(uri.empty()) {
-//        uri = "mysql://root:Fantast1c@192.168.1.194:3306/";
-//    }
-//    std::cout << uri << std::endl;
-    ::testing::AddGlobalTestEnvironment(new DBTestEnvironment);
+    test_env = new DBTestEnvironment(uri);
+    ::testing::AddGlobalTestEnvironment(test_env);
     return RUN_ALL_TESTS();
 }
diff --git a/cpp/unittest/db/utils.h b/cpp/unittest/db/utils.h
index 7a1320ef6b..dee9dcf843 100644
--- a/cpp/unittest/db/utils.h
+++ b/cpp/unittest/db/utils.h
@@ -20,7 +20,7 @@
 
 #include <gtest/gtest.h>
 #include <chrono>
-//#include <src/db/MySQLMetaImpl.h>
+#include <memory>
 
 #include "db/DB.h"
 #include "db/meta/SqliteMetaImpl.h"
@@ -28,7 +28,6 @@
 #include "scheduler/SchedInst.h"
 #include "scheduler/ResourceFactory.h"
 
-
 #define TIMING
 
 #ifdef TIMING
@@ -36,8 +35,7 @@
 #define START_TIMER  start = std::chrono::high_resolution_clock::now();
 #define STOP_TIMER(name)  LOG(DEBUG) << "RUNTIME of " << name << ": " << \
     std::chrono::duration_cast<std::chrono::milliseconds>( \
-            std::chrono::high_resolution_clock::now()-start \
-    ).count() << " ms ";
+            std::chrono::high_resolution_clock::now()-start).count() << " ms ";
 #else
 #define INIT_TIMER
 #define START_TIMER
@@ -45,11 +43,11 @@
 #endif
 
 class BaseTest : public ::testing::Test {
-protected:
+ protected:
     void InitLog();
 
-    virtual void SetUp() override;
-    virtual void TearDown() override;
+    void SetUp() override;
+    void TearDown() override;
     virtual zilliz::milvus::engine::DBOptions GetOptions();
 };
 
@@ -58,14 +56,14 @@ class DBTest : public BaseTest {
  protected:
     zilliz::milvus::engine::DBPtr db_;
 
-    virtual void SetUp() override;
-    virtual void TearDown() override;
+    void SetUp() override;
+    void TearDown() override;
 };
 
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 class DBTest2 : public DBTest {
  protected:
-    virtual zilliz::milvus::engine::DBOptions GetOptions() override;
+    zilliz::milvus::engine::DBOptions GetOptions() override;
 };
 
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////
@@ -77,14 +75,14 @@ class MetaTest : public BaseTest {
  protected:
     std::shared_ptr<zilliz::milvus::engine::meta::SqliteMetaImpl> impl_;
 
-    virtual void SetUp() override;
-    virtual void TearDown() override;
+    void SetUp() override;
+    void TearDown() override;
 };
 
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 class MySqlDBTest : public DBTest {
-protected:
-    zilliz::milvus::engine::DBOptions GetOptions();
+ protected:
+    zilliz::milvus::engine::DBOptions GetOptions() override;
 };
 
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////
@@ -92,12 +90,11 @@ class MySqlMetaTest : public BaseTest {
  protected:
     std::shared_ptr<zilliz::milvus::engine::meta::MySQLMetaImpl> impl_;
 
-    virtual void SetUp() override;
-    virtual void TearDown() override;
-    zilliz::milvus::engine::DBOptions GetOptions();
+    void SetUp() override;
+    void TearDown() override;
+    zilliz::milvus::engine::DBOptions GetOptions() override;
 };
 
-
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 class MemManagerTest : public MetaTest {
 };
diff --git a/cpp/unittest/main.cpp b/cpp/unittest/main.cpp
index 7a28bbf45f..d17cf9da58 100644
--- a/cpp/unittest/main.cpp
+++ b/cpp/unittest/main.cpp
@@ -19,13 +19,11 @@
 #include <gmock/gmock.h>
 
 #include "utils/easylogging++.h"
-#include "utils/CommonUtil.h"
 
 INITIALIZE_EASYLOGGINGPP
 
-using namespace zilliz::milvus;
-
-int main(int argc, char **argv) {
+int
+main(int argc, char **argv) {
     ::testing::InitGoogleTest(&argc, argv);
     return RUN_ALL_TESTS();
 }
diff --git a/cpp/unittest/metrics/metricbase_test.cpp b/cpp/unittest/metrics/metricbase_test.cpp
index 31766403be..7f77312480 100644
--- a/cpp/unittest/metrics/metricbase_test.cpp
+++ b/cpp/unittest/metrics/metricbase_test.cpp
@@ -21,12 +21,16 @@
 #include <gtest/gtest.h>
 #include <iostream>
 
-using namespace zilliz::milvus;
+namespace {
 
-TEST(MetricbaseTest, METRICBASE_TEST){
-    server::MetricsBase instance = server::MetricsBase::GetInstance();
+namespace ms = zilliz::milvus;
+
+} // namespace
+
+TEST(MetricbaseTest, METRICBASE_TEST) {
+    ms::server::MetricsBase instance = ms::server::MetricsBase::GetInstance();
     instance.Init();
-    server::SystemInfo::GetInstance().Init();
+    ms::server::SystemInfo::GetInstance().Init();
     instance.AddVectorsSuccessTotalIncrement();
     instance.AddVectorsFailTotalIncrement();
     instance.AddVectorsDurationHistogramOberve(1.0);
@@ -60,10 +64,10 @@ TEST(MetricbaseTest, METRICBASE_TEST){
     instance.QueryResponsePerSecondGaugeSet(1.0);
     instance.GPUPercentGaugeSet();
     instance.GPUMemoryUsageGaugeSet();
-    instance.AddVectorsPerSecondGaugeSet(1,1,1);
+    instance.AddVectorsPerSecondGaugeSet(1, 1, 1);
     instance.QueryIndexTypePerSecondSet("IVF", 1.0);
     instance.ConnectionGaugeIncrement();
     instance.ConnectionGaugeDecrement();
     instance.KeepingAliveCounterIncrement();
     instance.OctetsSet();
-}
\ No newline at end of file
+}
diff --git a/cpp/unittest/metrics/metrics_test.cpp b/cpp/unittest/metrics/metrics_test.cpp
index 14c1ead3f3..ec950fedcc 100644
--- a/cpp/unittest/metrics/metrics_test.cpp
+++ b/cpp/unittest/metrics/metrics_test.cpp
@@ -15,75 +15,73 @@
 // specific language governing permissions and limitations
 // under the License.
 
-#include <chrono>
 #include <chrono>
 #include <map>
 #include <memory>
 #include <string>
 #include <thread>
 #include <gtest/gtest.h>
-//#include "prometheus/registry.h"
-//#include "prometheus/exposer.h"
-#include <cache/CpuCacheMgr.h>
-#include <src/server/Config.h>
 
+#include "cache/CpuCacheMgr.h"
+#include "server/Config.h"
 #include "metrics/Metrics.h"
-#include "utils.h"
+#include "metrics/utils.h"
 #include "db/DB.h"
 #include "db/meta/SqliteMetaImpl.h"
 
+namespace {
 
-using namespace zilliz::milvus;
+namespace ms = zilliz::milvus;
 
+} // namespace
 
 TEST_F(MetricTest, METRIC_TEST) {
-    server::Config::GetInstance().SetMetricConfigCollector("zabbix");
-    server::Metrics::GetInstance();
-    server::Config::GetInstance().SetMetricConfigCollector("prometheus");
-    server::Metrics::GetInstance();
+    ms::server::Config::GetInstance().SetMetricConfigCollector("zabbix");
+    ms::server::Metrics::GetInstance();
+    ms::server::Config::GetInstance().SetMetricConfigCollector("prometheus");
+    ms::server::Metrics::GetInstance();
 
-    server::SystemInfo::GetInstance().Init();
+    ms::server::SystemInfo::GetInstance().Init();
 //    server::Metrics::GetInstance().Init();
 //    server::Metrics::GetInstance().exposer_ptr()->RegisterCollectable(server::Metrics::GetInstance().registry_ptr());
-    server::Metrics::GetInstance().Init();
+    ms::server::Metrics::GetInstance().Init();
 
 //    server::PrometheusMetrics::GetInstance().exposer_ptr()->RegisterCollectable(server::PrometheusMetrics::GetInstance().registry_ptr());
-    zilliz::milvus::cache::CpuCacheMgr::GetInstance()->SetCapacity(1UL*1024*1024*1024);
-    std::cout<<zilliz::milvus::cache::CpuCacheMgr::GetInstance()->CacheCapacity()<<std::endl;
+    zilliz::milvus::cache::CpuCacheMgr::GetInstance()->SetCapacity(1UL * 1024 * 1024 * 1024);
+    std::cout << zilliz::milvus::cache::CpuCacheMgr::GetInstance()->CacheCapacity() << std::endl;
 
-    static const char* group_name = "test_group";
+    static const char *group_name = "test_group";
     static const int group_dim = 256;
 
-    engine::meta::TableSchema group_info;
+    ms::engine::meta::TableSchema group_info;
     group_info.dimension_ = group_dim;
     group_info.table_id_ = group_name;
     auto stat = db_->CreateTable(group_info);
 
-    engine::meta::TableSchema group_info_get;
+    ms::engine::meta::TableSchema group_info_get;
     group_info_get.table_id_ = group_name;
     stat = db_->DescribeTable(group_info_get);
 
-
-    engine::IDNumbers vector_ids;
-    engine::IDNumbers target_ids;
+    ms::engine::IDNumbers vector_ids;
+    ms::engine::IDNumbers target_ids;
 
     int d = 256;
     int nb = 50;
     float *xb = new float[d * nb];
-    for(int i = 0; i < nb; i++) {
-        for(int j = 0; j < d; j++) xb[d * i + j] = drand48();
+    for (int i = 0; i < nb; i++) {
+        for (int j = 0; j < d; j++) xb[d * i + j] = drand48();
         xb[d * i] += i / 2000.;
     }
 
     int qb = 5;
     float *qxb = new float[d * qb];
-    for(int i = 0; i < qb; i++) {
-        for(int j = 0; j < d; j++) qxb[d * i + j] = drand48();
+    for (int i = 0; i < qb; i++) {
+        for (int j = 0; j < d; j++) qxb[d * i + j] = drand48();
         qxb[d * i] += i / 2000.;
     }
 
     std::thread search([&]() {
-        engine::QueryResults results;
+        ms::engine::QueryResults results;
         int k = 10;
         std::this_thread::sleep_for(std::chrono::seconds(2));
 
@@ -92,23 +90,23 @@ TEST_F(MetricTest, METRIC_TEST) {
         uint64_t count = 0;
         uint64_t prev_count = 0;
 
-        for (auto j=0; j<10; ++j) {
+        for (auto j = 0; j < 10; ++j) {
             ss.str("");
             db_->Size(count);
             prev_count = count;
 
             START_TIMER;
 //            stat = db_->Query(group_name, k, qb, qxb, results);
-            ss << "Search " << j << " With Size " << (float)(count*group_dim*sizeof(float))/(1024*1024) << " M";
+            ss << "Search " << j << " With Size " << (float) (count * group_dim * sizeof(float)) / (1024 * 1024)
+               << " M";
 
-            for (auto k=0; k<qb; ++k) {
+            for (auto k = 0; k < qb; ++k) {
 //                ASSERT_EQ(results[k][0].first, target_ids[k]);
                 ss.str("");
                 ss << "Result [" << k << "]:";
 //                for (auto result : results[k]) {
 //                    ss << result.first << " ";
 //                }
-
             }
             ASSERT_TRUE(count >= prev_count);
             std::this_thread::sleep_for(std::chrono::seconds(1));
@@ -117,8 +115,8 @@ TEST_F(MetricTest, METRIC_TEST) {
 
     int loop = 10000;
 
-    for (auto i=0; i<loop; ++i) {
-        if (i==40) {
+    for (auto i = 0; i < loop; ++i) {
+        if (i == 40) {
             db_->InsertVectors(group_name, qb, qxb, target_ids);
             ASSERT_EQ(target_ids.size(), qb);
         } else {
@@ -129,37 +127,37 @@ TEST_F(MetricTest, METRIC_TEST) {
 
     search.join();
 
-    delete [] xb;
-    delete [] qxb;
-};
+    delete[] xb;
+    delete[] qxb;
+}
 
-TEST_F(MetricTest, COLLECTOR_METRICS_TEST){
-    auto status = Status::OK();
-    server::CollectInsertMetrics insert_metrics0(0, status);
-    status = Status(DB_ERROR, "error");
-    server::CollectInsertMetrics insert_metrics1(0, status);
+TEST_F(MetricTest, COLLECTOR_METRICS_TEST) {
+    auto status = ms::Status::OK();
+    ms::server::CollectInsertMetrics insert_metrics0(0, status);
+    status = ms::Status(ms::DB_ERROR, "error");
+    ms::server::CollectInsertMetrics insert_metrics1(0, status);
 
-    server::CollectQueryMetrics query_metrics(10);
+    ms::server::CollectQueryMetrics query_metrics(10);
 
-    server::CollectMergeFilesMetrics merge_metrics();
+    ms::server::CollectMergeFilesMetrics merge_metrics();
 
-    server::CollectBuildIndexMetrics build_index_metrics();
+    ms::server::CollectBuildIndexMetrics build_index_metrics();
 
-    server::CollectExecutionEngineMetrics execution_metrics(10);
+    ms::server::CollectExecutionEngineMetrics execution_metrics(10);
 
-    server::CollectSerializeMetrics serialize_metrics(10);
+    ms::server::CollectSerializeMetrics serialize_metrics(10);
 
-    server::CollectAddMetrics add_metrics(10, 128);
+    ms::server::CollectAddMetrics add_metrics(10, 128);
 
-    server::CollectDurationMetrics duration_metrics_raw(engine::meta::TableFileSchema::RAW);
-    server::CollectDurationMetrics duration_metrics_index(engine::meta::TableFileSchema::TO_INDEX);
-    server::CollectDurationMetrics duration_metrics_delete(engine::meta::TableFileSchema::TO_DELETE);
+    ms::server::CollectDurationMetrics duration_metrics_raw(ms::engine::meta::TableFileSchema::RAW);
+    ms::server::CollectDurationMetrics duration_metrics_index(ms::engine::meta::TableFileSchema::TO_INDEX);
+    ms::server::CollectDurationMetrics duration_metrics_delete(ms::engine::meta::TableFileSchema::TO_DELETE);
 
-    server::CollectSearchTaskMetrics search_metrics_raw(engine::meta::TableFileSchema::RAW);
-    server::CollectSearchTaskMetrics search_metrics_index(engine::meta::TableFileSchema::TO_INDEX);
-    server::CollectSearchTaskMetrics search_metrics_delete(engine::meta::TableFileSchema::TO_DELETE);
+    ms::server::CollectSearchTaskMetrics search_metrics_raw(ms::engine::meta::TableFileSchema::RAW);
+    ms::server::CollectSearchTaskMetrics search_metrics_index(ms::engine::meta::TableFileSchema::TO_INDEX);
+    ms::server::CollectSearchTaskMetrics search_metrics_delete(ms::engine::meta::TableFileSchema::TO_DELETE);
 
-    server::MetricCollector metric_collector();
+    ms::server::MetricCollector metric_collector();
 }
 
 
diff --git a/cpp/unittest/metrics/prometheus_test.cpp b/cpp/unittest/metrics/prometheus_test.cpp
index a634a6ff9c..4847e61627 100644
--- a/cpp/unittest/metrics/prometheus_test.cpp
+++ b/cpp/unittest/metrics/prometheus_test.cpp
@@ -22,15 +22,19 @@
 #include <gtest/gtest.h>
 #include <iostream>
 
-using namespace zilliz::milvus;
+namespace {
 
-TEST(PrometheusTest, PROMETHEUS_TEST){
-    server::Config::GetInstance().SetMetricConfigEnableMonitor("on");
+namespace ms = zilliz::milvus;
 
-    server::PrometheusMetrics instance = server::PrometheusMetrics::GetInstance();
+} // namespace
+
+TEST(PrometheusTest, PROMETHEUS_TEST) {
+    ms::server::Config::GetInstance().SetMetricConfigEnableMonitor("on");
+
+    ms::server::PrometheusMetrics instance = ms::server::PrometheusMetrics::GetInstance();
     instance.Init();
     instance.SetStartup(true);
-    server::SystemInfo::GetInstance().Init();
+    ms::server::SystemInfo::GetInstance().Init();
     instance.AddVectorsSuccessTotalIncrement();
     instance.AddVectorsFailTotalIncrement();
     instance.AddVectorsDurationHistogramOberve(1.0);
@@ -64,7 +68,7 @@ TEST(PrometheusTest, PROMETHEUS_TEST){
     instance.QueryResponsePerSecondGaugeSet(1.0);
     instance.GPUPercentGaugeSet();
     instance.GPUMemoryUsageGaugeSet();
-    instance.AddVectorsPerSecondGaugeSet(1,1,1);
+    instance.AddVectorsPerSecondGaugeSet(1, 1, 1);
     instance.QueryIndexTypePerSecondSet("IVF", 1.0);
     instance.QueryIndexTypePerSecondSet("IDMap", 1.0);
     instance.ConnectionGaugeIncrement();
@@ -76,10 +80,9 @@ TEST(PrometheusTest, PROMETHEUS_TEST){
     instance.GPUTemperature();
     instance.CPUTemperature();
 
-    server::Config::GetInstance().SetMetricConfigEnableMonitor("off");
+    ms::server::Config::GetInstance().SetMetricConfigEnableMonitor("off");
     instance.Init();
     instance.CPUCoreUsagePercentSet();
     instance.GPUTemperature();
     instance.CPUTemperature();
-
-}
\ No newline at end of file
+}
diff --git a/cpp/unittest/metrics/utils.cpp b/cpp/unittest/metrics/utils.cpp
index 8d59a1e9c2..8275222766 100644
--- a/cpp/unittest/metrics/utils.cpp
+++ b/cpp/unittest/metrics/utils.cpp
@@ -18,32 +18,38 @@
 
 #include <iostream>
 #include <thread>
+#include <string>
 #include <boost/filesystem.hpp>
 
-#include "utils.h"
+#include "metrics/utils.h"
 #include "db/DBFactory.h"
 
 INITIALIZE_EASYLOGGINGPP
 
-using namespace zilliz::milvus;
+namespace {
 
-static std::string uri;
+namespace ms = zilliz::milvus;
 
 class DBTestEnvironment : public ::testing::Environment {
-public:
+ public:
+    explicit DBTestEnvironment(const std::string& uri) : uri_(uri) {}
 
-//    explicit DBTestEnvironment(std::string uri) : uri_(uri) {}
-
-    static std::string getURI() {
-        return uri;
+    std::string getURI() const {
+        return uri_;
     }
 
     void SetUp() override {
         getURI();
     }
 
+ private:
+    std::string uri_;
 };
 
+DBTestEnvironment* test_env = nullptr;
+
+} // namespace
+
 void MetricTest::InitLog() {
     el::Configurations defaultConf;
     defaultConf.setToDefault();
@@ -52,8 +58,8 @@ void MetricTest::InitLog() {
     el::Loggers::reconfigureLogger("default", defaultConf);
 }
 
-engine::DBOptions MetricTest::GetOptions() {
-    auto options = engine::DBFactory::BuildOption();
+ms::engine::DBOptions MetricTest::GetOptions() {
+    auto options = ms::engine::DBFactory::BuildOption();
     options.meta_.path_ = "/tmp/milvus_test";
     options.meta_.backend_uri_ = "sqlite://:@:/";
     return options;
@@ -62,7 +68,7 @@ engine::DBOptions MetricTest::GetOptions() {
 void MetricTest::SetUp() {
     InitLog();
     auto options = GetOptions();
-    db_ = engine::DBFactory::Build(options);
+    db_ = ms::engine::DBFactory::Build(options);
 }
 
 void MetricTest::TearDown() {
@@ -72,10 +78,12 @@ void MetricTest::TearDown() {
 
 int main(int argc, char **argv) {
     ::testing::InitGoogleTest(&argc, argv);
+
+    std::string uri;
     if (argc > 1) {
         uri = argv[1];
     }
-//    std::cout << uri << std::endl;
-    ::testing::AddGlobalTestEnvironment(new DBTestEnvironment);
+    test_env = new DBTestEnvironment(uri);
+    ::testing::AddGlobalTestEnvironment(test_env);
     return RUN_ALL_TESTS();
 }
diff --git a/cpp/unittest/metrics/utils.h b/cpp/unittest/metrics/utils.h
index 37c21c82f9..3daeeb8fa6 100644
--- a/cpp/unittest/metrics/utils.h
+++ b/cpp/unittest/metrics/utils.h
@@ -26,7 +26,6 @@
 #include "db/meta/SqliteMetaImpl.h"
 #include "db/meta/MySQLMetaImpl.h"
 
-
 #define TIMING
 
 #ifdef TIMING
@@ -34,15 +33,15 @@
 #define START_TIMER  start = std::chrono::high_resolution_clock::now();
 #define STOP_TIMER(name)  LOG(DEBUG) << "RUNTIME of " << name << ": " << \
     std::chrono::duration_cast<std::chrono::milliseconds>( \
-            std::chrono::high_resolution_clock::now()-start \
-    ).count() << " ms ";
+            std::chrono::high_resolution_clock::now()-start).count() << " ms ";
 #else
 #define INIT_TIMER
 #define START_TIMER
 #define STOP_TIMER(name)
 #endif
 
-void ASSERT_STATS(zilliz::milvus::Status& stat);
+void
+ASSERT_STATS(zilliz::milvus::Status &stat);
 
 //class TestEnv : public ::testing::Environment {
 //public:
@@ -66,11 +65,11 @@ void ASSERT_STATS(zilliz::milvus::Status& stat);
 //        ::testing::AddGlobalTestEnvironment(new TestEnv);
 
 class MetricTest : public ::testing::Test {
-protected:
+ protected:
     zilliz::milvus::engine::DBPtr db_;
 
     void InitLog();
-    virtual void SetUp() override;
-    virtual void TearDown() override;
+    void SetUp() override;
+    void TearDown() override;
     virtual zilliz::milvus::engine::DBOptions GetOptions();
-};
\ No newline at end of file
+};
diff --git a/cpp/unittest/scheduler/algorithm_test.cpp b/cpp/unittest/scheduler/algorithm_test.cpp
index fe619c4981..56574a7463 100644
--- a/cpp/unittest/scheduler/algorithm_test.cpp
+++ b/cpp/unittest/scheduler/algorithm_test.cpp
@@ -101,11 +101,8 @@ TEST_F(AlgorithmTest, SHORTESTPATH_TEST) {
         std::cout << sp[sp.size() - 1] << std::endl;
         sp.pop_back();
     }
-
-
 }
 
-
-}
-}
-}
\ No newline at end of file
+} // namespace scheduler
+} // namespace milvus
+} // namespace zilliz
diff --git a/cpp/unittest/scheduler/event_test.cpp b/cpp/unittest/scheduler/event_test.cpp
index 34d4c2ce23..73fffc8f6e 100644
--- a/cpp/unittest/scheduler/event_test.cpp
+++ b/cpp/unittest/scheduler/event_test.cpp
@@ -60,7 +60,7 @@ TEST(EventTest, TASKTABLE_UPDATED_EVENT) {
     std::cout << *EventPtr(event);
 }
 
-}
-}
-}
+} // namespace scheduler
+} // namespace milvus
+} // namespace zilliz
 
diff --git a/cpp/unittest/scheduler/node_test.cpp b/cpp/unittest/scheduler/node_test.cpp
index b87611d3ca..3323453f0b 100644
--- a/cpp/unittest/scheduler/node_test.cpp
+++ b/cpp/unittest/scheduler/node_test.cpp
@@ -19,37 +19,40 @@
 #include "scheduler/resource/Node.h"
 #include <gtest/gtest.h>
 
+namespace {
 
-using namespace zilliz::milvus::scheduler;
+namespace ms = zilliz::milvus::scheduler;
+
+} // namespace
 
 class NodeTest : public ::testing::Test {
-protected:
+ protected:
     void
     SetUp() override {
-        node1_ = std::make_shared<Node>();
-        node2_ = std::make_shared<Node>();
-        node3_ = std::make_shared<Node>();
-        isolated_node1_ = std::make_shared<Node>();
-        isolated_node2_ = std::make_shared<Node>();
+        node1_ = std::make_shared<ms::Node>();
+        node2_ = std::make_shared<ms::Node>();
+        node3_ = std::make_shared<ms::Node>();
+        isolated_node1_ = std::make_shared<ms::Node>();
+        isolated_node2_ = std::make_shared<ms::Node>();
 
-        auto pcie = Connection("PCIe", 11.0);
+        auto pcie = ms::Connection("PCIe", 11.0);
 
         node1_->AddNeighbour(node2_, pcie);
         node1_->AddNeighbour(node3_, pcie);
         node2_->AddNeighbour(node1_, pcie);
     }
 
-    NodePtr node1_;
-    NodePtr node2_;
-    NodePtr node3_;
-    NodePtr isolated_node1_;
-    NodePtr isolated_node2_;
+    ms::NodePtr node1_;
+    ms::NodePtr node2_;
+    ms::NodePtr node3_;
+    ms::NodePtr isolated_node1_;
+    ms::NodePtr isolated_node2_;
 };
 
 TEST_F(NodeTest, ADD_NEIGHBOUR) {
     ASSERT_EQ(isolated_node1_->GetNeighbours().size(), 0);
     ASSERT_EQ(isolated_node2_->GetNeighbours().size(), 0);
-    auto pcie = Connection("PCIe", 11.0);
+    auto pcie = ms::Connection("PCIe", 11.0);
     isolated_node1_->AddNeighbour(isolated_node2_, pcie);
     ASSERT_EQ(isolated_node1_->GetNeighbours().size(), 1);
     ASSERT_EQ(isolated_node2_->GetNeighbours().size(), 0);
@@ -58,7 +61,7 @@ TEST_F(NodeTest, ADD_NEIGHBOUR) {
 TEST_F(NodeTest, REPEAT_ADD_NEIGHBOUR) {
     ASSERT_EQ(isolated_node1_->GetNeighbours().size(), 0);
     ASSERT_EQ(isolated_node2_->GetNeighbours().size(), 0);
-    auto pcie = Connection("PCIe", 11.0);
+    auto pcie = ms::Connection("PCIe", 11.0);
     isolated_node1_->AddNeighbour(isolated_node2_, pcie);
     isolated_node1_->AddNeighbour(isolated_node2_, pcie);
     ASSERT_EQ(isolated_node1_->GetNeighbours().size(), 1);
@@ -97,3 +100,4 @@ TEST_F(NodeTest, DUMP) {
     std::cout << node2_->Dump();
     ASSERT_FALSE(node2_->Dump().empty());
 }
+
diff --git a/cpp/unittest/scheduler/normal_test.cpp b/cpp/unittest/scheduler/normal_test.cpp
index 535fa96731..e24b43c6f8 100644
--- a/cpp/unittest/scheduler/normal_test.cpp
+++ b/cpp/unittest/scheduler/normal_test.cpp
@@ -25,35 +25,37 @@
 #include "utils/Log.h"
 #include <gtest/gtest.h>
 
+namespace {
 
-using namespace zilliz::milvus::scheduler;
+namespace ms = zilliz::milvus::scheduler;
 
+} // namespace
 
 TEST(NormalTest, INST_TEST) {
     // ResourceMgr only compose resources, provide unified event
-    auto res_mgr = ResMgrInst::GetInstance();
+    auto res_mgr = ms::ResMgrInst::GetInstance();
 
-    res_mgr->Add(ResourceFactory::Create("disk", "DISK", 0, true, false));
-    res_mgr->Add(ResourceFactory::Create("cpu", "CPU", 0, true, true));
+    res_mgr->Add(ms::ResourceFactory::Create("disk", "DISK", 0, true, false));
+    res_mgr->Add(ms::ResourceFactory::Create("cpu", "CPU", 0, true, true));
 
-    auto IO = Connection("IO", 500.0);
+    auto IO = ms::Connection("IO", 500.0);
     res_mgr->Connect("disk", "cpu", IO);
 
-    auto scheduler = SchedInst::GetInstance();
+    auto scheduler = ms::SchedInst::GetInstance();
 
     res_mgr->Start();
     scheduler->Start();
 
     const uint64_t NUM_TASK = 1000;
-    std::vector<std::shared_ptr<TestTask>> tasks;
-    TableFileSchemaPtr dummy = nullptr;
+    std::vector<std::shared_ptr<ms::TestTask>> tasks;
+    ms::TableFileSchemaPtr dummy = nullptr;
 
     auto disks = res_mgr->GetDiskResources();
     ASSERT_FALSE(disks.empty());
     if (auto observe = disks[0].lock()) {
         for (uint64_t i = 0; i < NUM_TASK; ++i) {
-            auto task = std::make_shared<TestTask>(dummy);
-            task->label() = std::make_shared<DefaultLabel>();
+            auto task = std::make_shared<ms::TestTask>(dummy);
+            task->label() = std::make_shared<ms::DefaultLabel>();
             tasks.push_back(task);
             observe->task_table().Put(task);
         }
@@ -67,5 +69,4 @@ TEST(NormalTest, INST_TEST) {
 
     scheduler->Stop();
     res_mgr->Stop();
-
 }
diff --git a/cpp/unittest/scheduler/resource_factory_test.cpp b/cpp/unittest/scheduler/resource_factory_test.cpp
index e2a84257eb..679edc6e3f 100644
--- a/cpp/unittest/scheduler/resource_factory_test.cpp
+++ b/cpp/unittest/scheduler/resource_factory_test.cpp
@@ -19,15 +19,18 @@
 #include "scheduler/ResourceFactory.h"
 #include <gtest/gtest.h>
 
+namespace {
 
-using namespace zilliz::milvus::scheduler;
+namespace ms = zilliz::milvus::scheduler;
+
+} // namespace
 
 TEST(ResourceFactoryTest, CREATE) {
-    auto disk = ResourceFactory::Create("ssd", "DISK", 0);
-    auto cpu = ResourceFactory::Create("cpu", "CPU", 0);
-    auto gpu = ResourceFactory::Create("gpu", "GPU", 0);
+    auto disk = ms::ResourceFactory::Create("ssd", "DISK", 0);
+    auto cpu = ms::ResourceFactory::Create("cpu", "CPU", 0);
+    auto gpu = ms::ResourceFactory::Create("gpu", "GPU", 0);
 
-    ASSERT_TRUE(std::dynamic_pointer_cast<DiskResource>(disk));
-    ASSERT_TRUE(std::dynamic_pointer_cast<CpuResource>(cpu));
-    ASSERT_TRUE(std::dynamic_pointer_cast<GpuResource>(gpu));
+    ASSERT_TRUE(std::dynamic_pointer_cast<ms::DiskResource>(disk));
+    ASSERT_TRUE(std::dynamic_pointer_cast<ms::CpuResource>(cpu));
+    ASSERT_TRUE(std::dynamic_pointer_cast<ms::GpuResource>(gpu));
 }
diff --git a/cpp/unittest/scheduler/resource_mgr_test.cpp b/cpp/unittest/scheduler/resource_mgr_test.cpp
index c2be785a00..bf8ade9f64 100644
--- a/cpp/unittest/scheduler/resource_mgr_test.cpp
+++ b/cpp/unittest/scheduler/resource_mgr_test.cpp
@@ -24,15 +24,13 @@
 #include "scheduler/ResourceMgr.h"
 #include <gtest/gtest.h>
 
-
 namespace zilliz {
 namespace milvus {
 namespace scheduler {
 
-
 /************ ResourceMgrBaseTest ************/
 class ResourceMgrBaseTest : public testing::Test {
-protected:
+ protected:
     void
     SetUp() override {
         empty_mgr_ = std::make_shared<ResourceMgr>();
@@ -77,7 +75,6 @@ TEST_F(ResourceMgrBaseTest, CONNECT) {
     ASSERT_TRUE(empty_mgr_->Connect("resource1", "resource2", io));
 }
 
-
 TEST_F(ResourceMgrBaseTest, INVALID_CONNECT) {
     auto resource1 = std::make_shared<TestResource>("resource1", 0, true, true);
     auto resource2 = std::make_shared<TestResource>("resource2", 2, true, true);
@@ -87,7 +84,6 @@ TEST_F(ResourceMgrBaseTest, INVALID_CONNECT) {
     ASSERT_FALSE(empty_mgr_->Connect("xx", "yy", io));
 }
 
-
 TEST_F(ResourceMgrBaseTest, CLEAR) {
     ASSERT_EQ(mgr1_->GetNumOfResource(), 3);
     mgr1_->Clear();
@@ -163,7 +159,7 @@ TEST_F(ResourceMgrBaseTest, DUMP_TASKTABLES) {
 /************ ResourceMgrAdvanceTest ************/
 
 class ResourceMgrAdvanceTest : public testing::Test {
-    protected:
+ protected:
     void
     SetUp() override {
         mgr1_ = std::make_shared<ResourceMgr>();
@@ -193,7 +189,6 @@ TEST_F(ResourceMgrAdvanceTest, REGISTER_SUBSCRIBER) {
     ASSERT_TRUE(flag);
 }
 
-
-}
-}
-}
+} // namespace scheduler
+} // namespace milvus
+} // namespace zilliz
diff --git a/cpp/unittest/scheduler/resource_test.cpp b/cpp/unittest/scheduler/resource_test.cpp
index b335a601db..b6c522b8b5 100644
--- a/cpp/unittest/scheduler/resource_test.cpp
+++ b/cpp/unittest/scheduler/resource_test.cpp
@@ -26,20 +26,19 @@
 #include "scheduler/ResourceFactory.h"
 #include <gtest/gtest.h>
 
-
 namespace zilliz {
 namespace milvus {
 namespace scheduler {
 
 /************ ResourceBaseTest ************/
 class ResourceBaseTest : public testing::Test {
-protected:
+ protected:
     void
     SetUp() override {
-        only_loader_  = std::make_shared<DiskResource>(name1, id1, true, false);
-        only_executor_  = std::make_shared<CpuResource>(name2, id2, false, true);
-        both_enable_  = std::make_shared<GpuResource>(name3, id3, true, true);
-        both_disable_  = std::make_shared<TestResource>(name4, id4, false, false);
+        only_loader_ = std::make_shared<DiskResource>(name1, id1, true, false);
+        only_executor_ = std::make_shared<CpuResource>(name2, id2, false, true);
+        both_enable_ = std::make_shared<GpuResource>(name3, id3, true, true);
+        both_disable_ = std::make_shared<TestResource>(name4, id4, false, false);
     }
 
     const std::string name1 = "only_loader_";
@@ -104,7 +103,7 @@ TEST_F(ResourceBaseTest, DUMP) {
 /************ ResourceAdvanceTest ************/
 
 class ResourceAdvanceTest : public testing::Test {
-protected:
+ protected:
     void
     SetUp() override {
         disk_resource_ = ResourceFactory::Create("ssd", "DISK", 0);
@@ -156,13 +155,17 @@ protected:
     void
     WaitLoader(uint64_t count) {
         std::unique_lock<std::mutex> lock(load_mutex_);
-        cv_.wait(lock, [&] { return load_count_ == count; });
+        cv_.wait(lock, [&] {
+            return load_count_ == count;
+        });
     }
 
     void
     WaitExecutor(uint64_t count) {
         std::unique_lock<std::mutex> lock(exec_mutex_);
-        cv_.wait(lock, [&] { return exec_count_ == count; });
+        cv_.wait(lock, [&] {
+            return exec_count_ == count;
+        });
     }
 
     ResourcePtr disk_resource_;
@@ -277,6 +280,6 @@ TEST_F(ResourceAdvanceTest, TEST_RESOURCE_TEST) {
     }
 }
 
-}
-}
-}
+} // namespace scheduler
+} // namespace milvus
+} // namespace zilliz
diff --git a/cpp/unittest/scheduler/schedinst_test.cpp b/cpp/unittest/scheduler/schedinst_test.cpp
index cf1003f5ce..4f3364c8fb 100644
--- a/cpp/unittest/scheduler/schedinst_test.cpp
+++ b/cpp/unittest/scheduler/schedinst_test.cpp
@@ -25,10 +25,8 @@ namespace zilliz {
 namespace milvus {
 namespace scheduler {
 
-
 class SchedInstTest : public testing::Test {
-
-protected:
+ protected:
     void
     SetUp() override {
         boost::filesystem::create_directory(TMP_DIR);
@@ -83,6 +81,8 @@ TEST_F(SchedInstTest, SIMPLE_GPU) {
     StartSchedulerService();
 }
 
-}
-}
-}
+} // namespace scheduler
+} // namespace milvus
+} // namespace zilliz
+
+
diff --git a/cpp/unittest/scheduler/scheduler_test.cpp b/cpp/unittest/scheduler/scheduler_test.cpp
index 8fc65f7d3b..4acfda315a 100644
--- a/cpp/unittest/scheduler/scheduler_test.cpp
+++ b/cpp/unittest/scheduler/scheduler_test.cpp
@@ -28,19 +28,18 @@
 #include "utils/Error.h"
 #include "wrapper/VecIndex.h"
 
-
 namespace zilliz {
 namespace milvus {
 namespace scheduler {
 
 class MockVecIndex : public engine::VecIndex {
-public:
-    virtual Status BuildAll(const long &nb,
-                               const float *xb,
-                               const long *ids,
-                               const engine::Config &cfg,
-                               const long &nt = 0,
-                               const float *xt = nullptr) {
+ public:
+    virtual Status BuildAll(const int64_t &nb,
+                            const float *xb,
+                            const int64_t *ids,
+                            const engine::Config &cfg,
+                            const int64_t &nt = 0,
+                            const float *xt = nullptr) {
     }
 
     engine::VecIndexPtr Clone() override {
@@ -55,27 +54,23 @@ public:
         return engine::IndexType::INVALID;
     }
 
-    virtual Status Add(const long &nb,
-                          const float *xb,
-                          const long *ids,
-                          const engine::Config &cfg = engine::Config()) {
-
+    virtual Status Add(const int64_t &nb,
+                       const float *xb,
+                       const int64_t *ids,
+                       const engine::Config &cfg = engine::Config()) {
     }
 
-    virtual Status Search(const long &nq,
-                             const float *xq,
-                             float *dist,
-                             long *ids,
-                             const engine::Config &cfg = engine::Config()) {
-
+    virtual Status Search(const int64_t &nq,
+                          const float *xq,
+                          float *dist,
+                          int64_t *ids,
+                          const engine::Config &cfg = engine::Config()) {
     }
 
     engine::VecIndexPtr CopyToGpu(const int64_t &device_id, const engine::Config &cfg) override {
-
     }
 
     engine::VecIndexPtr CopyToCpu(const engine::Config &cfg) override {
-
     }
 
     virtual int64_t Dimension() {
@@ -92,20 +87,18 @@ public:
     }
 
     virtual Status Load(const zilliz::knowhere::BinarySet &index_binary) {
-
     }
 
-public:
+ public:
     int64_t dimension_ = 512;
     int64_t ntotal_ = 0;
 };
 
-
 class SchedulerTest : public testing::Test {
-protected:
+ protected:
     void
     SetUp() override {
-        constexpr int64_t cache_cap = 1024*1024*1024;
+        constexpr int64_t cache_cap = 1024 * 1024 * 1024;
         cache::GpuCacheMgr::GetInstance(0)->SetCapacity(cache_cap);
         cache::GpuCacheMgr::GetInstance(1)->SetCapacity(cache_cap);
 
@@ -170,7 +163,6 @@ TEST_F(SchedulerTest, ON_LOAD_COMPLETED) {
 
     sleep(3);
     ASSERT_EQ(res_mgr_->GetResource(ResourceType::GPU, 1)->task_table().Size(), NUM);
-
 }
 
 TEST_F(SchedulerTest, PUSH_TASK_TO_NEIGHBOUR_RANDOMLY_TEST) {
@@ -193,7 +185,7 @@ TEST_F(SchedulerTest, PUSH_TASK_TO_NEIGHBOUR_RANDOMLY_TEST) {
 }
 
 class SchedulerTest2 : public testing::Test {
-protected:
+ protected:
     void
     SetUp() override {
         ResourcePtr disk = ResourceFactory::Create("disk", "DISK", 0, true, false);
@@ -243,7 +235,6 @@ protected:
     std::shared_ptr<Scheduler> scheduler_;
 };
 
-
 TEST_F(SchedulerTest2, SPECIFIED_RESOURCE_TEST) {
     const uint64_t NUM = 10;
     std::vector<std::shared_ptr<TestTask>> tasks;
@@ -260,6 +251,6 @@ TEST_F(SchedulerTest2, SPECIFIED_RESOURCE_TEST) {
 //    ASSERT_EQ(res_mgr_->GetResource(ResourceType::GPU, 1)->task_table().Size(), NUM);
 }
 
-}
-}
-}
+} // namespace scheduler
+} // namespace milvus
+} // namespace zilliz
diff --git a/cpp/unittest/scheduler/task_test.cpp b/cpp/unittest/scheduler/task_test.cpp
index 17d1e28cd6..d4bb0318da 100644
--- a/cpp/unittest/scheduler/task_test.cpp
+++ b/cpp/unittest/scheduler/task_test.cpp
@@ -19,17 +19,16 @@
 #include "scheduler/task/SearchTask.h"
 #include <gtest/gtest.h>
 
-
 namespace zilliz {
 namespace milvus {
 namespace scheduler {
 
-
 TEST(TaskTest, INVALID_INDEX) {
     auto search_task = std::make_shared<XSearchTask>(nullptr);
     search_task->Load(LoadType::TEST, 10);
 }
 
-}
-}
-}
+} // namespace scheduler
+} // namespace milvus
+} // namespace zilliz
+
diff --git a/cpp/unittest/scheduler/tasktable_test.cpp b/cpp/unittest/scheduler/tasktable_test.cpp
index 5c64a72351..0cb7018023 100644
--- a/cpp/unittest/scheduler/tasktable_test.cpp
+++ b/cpp/unittest/scheduler/tasktable_test.cpp
@@ -20,51 +20,53 @@
 #include "scheduler/task/TestTask.h"
 #include <gtest/gtest.h>
 
+namespace {
 
-using namespace zilliz::milvus::scheduler;
+namespace ms = zilliz::milvus::scheduler;
 
+} // namespace
 
 /************ TaskTableBaseTest ************/
 
 class TaskTableItemTest : public ::testing::Test {
-protected:
+ protected:
     void
     SetUp() override {
-        std::vector<TaskTableItemState> states{
-            TaskTableItemState::INVALID,
-            TaskTableItemState::START,
-            TaskTableItemState::LOADING,
-            TaskTableItemState::LOADED,
-            TaskTableItemState::EXECUTING,
-            TaskTableItemState::EXECUTED,
-            TaskTableItemState::MOVING,
-            TaskTableItemState::MOVED};
+        std::vector<ms::TaskTableItemState> states{
+            ms::TaskTableItemState::INVALID,
+            ms::TaskTableItemState::START,
+            ms::TaskTableItemState::LOADING,
+            ms::TaskTableItemState::LOADED,
+            ms::TaskTableItemState::EXECUTING,
+            ms::TaskTableItemState::EXECUTED,
+            ms::TaskTableItemState::MOVING,
+            ms::TaskTableItemState::MOVED};
         for (auto &state : states) {
-            auto item = std::make_shared<TaskTableItem>();
+            auto item = std::make_shared<ms::TaskTableItem>();
             item->state = state;
             items_.emplace_back(item);
         }
     }
 
-    TaskTableItem default_;
-    std::vector<TaskTableItemPtr> items_;
+    ms::TaskTableItem default_;
+    std::vector<ms::TaskTableItemPtr> items_;
 };
 
 TEST_F(TaskTableItemTest, CONSTRUCT) {
     ASSERT_EQ(default_.id, 0);
     ASSERT_EQ(default_.task, nullptr);
-    ASSERT_EQ(default_.state, TaskTableItemState::INVALID);
+    ASSERT_EQ(default_.state, ms::TaskTableItemState::INVALID);
 }
 
 TEST_F(TaskTableItemTest, DESTRUCT) {
-    auto p_item = new TaskTableItem();
+    auto p_item = new ms::TaskTableItem();
     delete p_item;
 }
 
 TEST_F(TaskTableItemTest, IS_FINISH) {
     for (auto &item : items_) {
-        if (item->state == TaskTableItemState::EXECUTED
-            || item->state == TaskTableItemState::MOVED) {
+        if (item->state == ms::TaskTableItemState::EXECUTED
+            || item->state == ms::TaskTableItemState::MOVED) {
             ASSERT_TRUE(item->IsFinish());
         } else {
             ASSERT_FALSE(item->IsFinish());
@@ -82,9 +84,9 @@ TEST_F(TaskTableItemTest, LOAD) {
     for (auto &item : items_) {
         auto before_state = item->state;
         auto ret = item->Load();
-        if (before_state == TaskTableItemState::START) {
+        if (before_state == ms::TaskTableItemState::START) {
             ASSERT_TRUE(ret);
-            ASSERT_EQ(item->state, TaskTableItemState::LOADING);
+            ASSERT_EQ(item->state, ms::TaskTableItemState::LOADING);
         } else {
             ASSERT_FALSE(ret);
             ASSERT_EQ(item->state, before_state);
@@ -96,9 +98,9 @@ TEST_F(TaskTableItemTest, LOADED) {
     for (auto &item : items_) {
         auto before_state = item->state;
         auto ret = item->Loaded();
-        if (before_state == TaskTableItemState::LOADING) {
+        if (before_state == ms::TaskTableItemState::LOADING) {
             ASSERT_TRUE(ret);
-            ASSERT_EQ(item->state, TaskTableItemState::LOADED);
+            ASSERT_EQ(item->state, ms::TaskTableItemState::LOADED);
         } else {
             ASSERT_FALSE(ret);
             ASSERT_EQ(item->state, before_state);
@@ -110,9 +112,9 @@ TEST_F(TaskTableItemTest, EXECUTE) {
     for (auto &item : items_) {
         auto before_state = item->state;
         auto ret = item->Execute();
-        if (before_state == TaskTableItemState::LOADED) {
+        if (before_state == ms::TaskTableItemState::LOADED) {
             ASSERT_TRUE(ret);
-            ASSERT_EQ(item->state, TaskTableItemState::EXECUTING);
+            ASSERT_EQ(item->state, ms::TaskTableItemState::EXECUTING);
         } else {
             ASSERT_FALSE(ret);
             ASSERT_EQ(item->state, before_state);
@@ -120,14 +122,13 @@ TEST_F(TaskTableItemTest, EXECUTE) {
     }
 }
 
-
 TEST_F(TaskTableItemTest, EXECUTED) {
     for (auto &item : items_) {
         auto before_state = item->state;
         auto ret = item->Executed();
-        if (before_state == TaskTableItemState::EXECUTING) {
+        if (before_state == ms::TaskTableItemState::EXECUTING) {
             ASSERT_TRUE(ret);
-            ASSERT_EQ(item->state, TaskTableItemState::EXECUTED);
+            ASSERT_EQ(item->state, ms::TaskTableItemState::EXECUTED);
         } else {
             ASSERT_FALSE(ret);
             ASSERT_EQ(item->state, before_state);
@@ -139,9 +140,9 @@ TEST_F(TaskTableItemTest, MOVE) {
     for (auto &item : items_) {
         auto before_state = item->state;
         auto ret = item->Move();
-        if (before_state == TaskTableItemState::LOADED) {
+        if (before_state == ms::TaskTableItemState::LOADED) {
             ASSERT_TRUE(ret);
-            ASSERT_EQ(item->state, TaskTableItemState::MOVING);
+            ASSERT_EQ(item->state, ms::TaskTableItemState::MOVING);
         } else {
             ASSERT_FALSE(ret);
             ASSERT_EQ(item->state, before_state);
@@ -153,9 +154,9 @@ TEST_F(TaskTableItemTest, MOVED) {
     for (auto &item : items_) {
         auto before_state = item->state;
         auto ret = item->Moved();
-        if (before_state == TaskTableItemState::MOVING) {
+        if (before_state == ms::TaskTableItemState::MOVING) {
             ASSERT_TRUE(ret);
-            ASSERT_EQ(item->state, TaskTableItemState::MOVED);
+            ASSERT_EQ(item->state, ms::TaskTableItemState::MOVED);
         } else {
             ASSERT_FALSE(ret);
             ASSERT_EQ(item->state, before_state);
@@ -166,19 +167,19 @@ TEST_F(TaskTableItemTest, MOVED) {
 /************ TaskTableBaseTest ************/
 
 class TaskTableBaseTest : public ::testing::Test {
-protected:
+ protected:
     void
     SetUp() override {
-        TableFileSchemaPtr dummy = nullptr;
+        ms::TableFileSchemaPtr dummy = nullptr;
         invalid_task_ = nullptr;
-        task1_ = std::make_shared<TestTask>(dummy);
-        task2_ = std::make_shared<TestTask>(dummy);
+        task1_ = std::make_shared<ms::TestTask>(dummy);
+        task2_ = std::make_shared<ms::TestTask>(dummy);
     }
 
-    TaskPtr invalid_task_;
-    TaskPtr task1_;
-    TaskPtr task2_;
-    TaskTable empty_table_;
+    ms::TaskPtr invalid_task_;
+    ms::TaskPtr task1_;
+    ms::TaskPtr task2_;
+    ms::TaskTable empty_table_;
 };
 
 TEST_F(TaskTableBaseTest, SUBSCRIBER) {
@@ -191,7 +192,6 @@ TEST_F(TaskTableBaseTest, SUBSCRIBER) {
     ASSERT_TRUE(flag);
 }
 
-
 TEST_F(TaskTableBaseTest, PUT_TASK) {
     empty_table_.Put(task1_);
     ASSERT_EQ(empty_table_.Get(0)->task, task1_);
@@ -203,14 +203,14 @@ TEST_F(TaskTableBaseTest, PUT_INVALID_TEST) {
 }
 
 TEST_F(TaskTableBaseTest, PUT_BATCH) {
-    std::vector<TaskPtr> tasks{task1_, task2_};
+    std::vector<ms::TaskPtr> tasks{task1_, task2_};
     empty_table_.Put(tasks);
     ASSERT_EQ(empty_table_.Get(0)->task, task1_);
     ASSERT_EQ(empty_table_.Get(1)->task, task2_);
 }
 
 TEST_F(TaskTableBaseTest, PUT_EMPTY_BATCH) {
-    std::vector<TaskPtr> tasks{};
+    std::vector<ms::TaskPtr> tasks{};
     empty_table_.Put(tasks);
 }
 
@@ -236,8 +236,8 @@ TEST_F(TaskTableBaseTest, PICK_TO_LOAD) {
     for (size_t i = 0; i < NUM_TASKS; ++i) {
         empty_table_.Put(task1_);
     }
-    empty_table_[0]->state = TaskTableItemState::MOVED;
-    empty_table_[1]->state = TaskTableItemState::EXECUTED;
+    empty_table_[0]->state = ms::TaskTableItemState::MOVED;
+    empty_table_[1]->state = ms::TaskTableItemState::EXECUTED;
 
     auto indexes = empty_table_.PickToLoad(1);
     ASSERT_EQ(indexes.size(), 1);
@@ -249,8 +249,8 @@ TEST_F(TaskTableBaseTest, PICK_TO_LOAD_LIMIT) {
     for (size_t i = 0; i < NUM_TASKS; ++i) {
         empty_table_.Put(task1_);
     }
-    empty_table_[0]->state = TaskTableItemState::MOVED;
-    empty_table_[1]->state = TaskTableItemState::EXECUTED;
+    empty_table_[0]->state = ms::TaskTableItemState::MOVED;
+    empty_table_[1]->state = ms::TaskTableItemState::EXECUTED;
 
     auto indexes = empty_table_.PickToLoad(3);
     ASSERT_EQ(indexes.size(), 3);
@@ -264,8 +264,8 @@ TEST_F(TaskTableBaseTest, PICK_TO_LOAD_CACHE) {
     for (size_t i = 0; i < NUM_TASKS; ++i) {
         empty_table_.Put(task1_);
     }
-    empty_table_[0]->state = TaskTableItemState::MOVED;
-    empty_table_[1]->state = TaskTableItemState::EXECUTED;
+    empty_table_[0]->state = ms::TaskTableItemState::MOVED;
+    empty_table_[1]->state = ms::TaskTableItemState::EXECUTED;
 
     // first pick, non-cache
     auto indexes = empty_table_.PickToLoad(1);
@@ -274,7 +274,7 @@ TEST_F(TaskTableBaseTest, PICK_TO_LOAD_CACHE) {
 
     // second pick, iterate from 2
     // invalid state change
-    empty_table_[1]->state = TaskTableItemState::START;
+    empty_table_[1]->state = ms::TaskTableItemState::START;
     indexes = empty_table_.PickToLoad(1);
     ASSERT_EQ(indexes.size(), 1);
     ASSERT_EQ(indexes[0], 2);
@@ -285,9 +285,9 @@ TEST_F(TaskTableBaseTest, PICK_TO_EXECUTE) {
     for (size_t i = 0; i < NUM_TASKS; ++i) {
         empty_table_.Put(task1_);
     }
-    empty_table_[0]->state = TaskTableItemState::MOVED;
-    empty_table_[1]->state = TaskTableItemState::EXECUTED;
-    empty_table_[2]->state = TaskTableItemState::LOADED;
+    empty_table_[0]->state = ms::TaskTableItemState::MOVED;
+    empty_table_[1]->state = ms::TaskTableItemState::EXECUTED;
+    empty_table_[2]->state = ms::TaskTableItemState::LOADED;
 
     auto indexes = empty_table_.PickToExecute(1);
     ASSERT_EQ(indexes.size(), 1);
@@ -299,10 +299,10 @@ TEST_F(TaskTableBaseTest, PICK_TO_EXECUTE_LIMIT) {
     for (size_t i = 0; i < NUM_TASKS; ++i) {
         empty_table_.Put(task1_);
     }
-    empty_table_[0]->state = TaskTableItemState::MOVED;
-    empty_table_[1]->state = TaskTableItemState::EXECUTED;
-    empty_table_[2]->state = TaskTableItemState::LOADED;
-    empty_table_[3]->state = TaskTableItemState::LOADED;
+    empty_table_[0]->state = ms::TaskTableItemState::MOVED;
+    empty_table_[1]->state = ms::TaskTableItemState::EXECUTED;
+    empty_table_[2]->state = ms::TaskTableItemState::LOADED;
+    empty_table_[3]->state = ms::TaskTableItemState::LOADED;
 
     auto indexes = empty_table_.PickToExecute(3);
     ASSERT_EQ(indexes.size(), 2);
@@ -315,9 +315,9 @@ TEST_F(TaskTableBaseTest, PICK_TO_EXECUTE_CACHE) {
     for (size_t i = 0; i < NUM_TASKS; ++i) {
         empty_table_.Put(task1_);
     }
-    empty_table_[0]->state = TaskTableItemState::MOVED;
-    empty_table_[1]->state = TaskTableItemState::EXECUTED;
-    empty_table_[2]->state = TaskTableItemState::LOADED;
+    empty_table_[0]->state = ms::TaskTableItemState::MOVED;
+    empty_table_[1]->state = ms::TaskTableItemState::EXECUTED;
+    empty_table_[2]->state = ms::TaskTableItemState::LOADED;
 
     // first pick, non-cache
     auto indexes = empty_table_.PickToExecute(1);
@@ -326,40 +326,39 @@ TEST_F(TaskTableBaseTest, PICK_TO_EXECUTE_CACHE) {
 
     // second pick, iterate from 2
     // invalid state change
-    empty_table_[1]->state = TaskTableItemState::START;
+    empty_table_[1]->state = ms::TaskTableItemState::START;
     indexes = empty_table_.PickToExecute(1);
     ASSERT_EQ(indexes.size(), 1);
     ASSERT_EQ(indexes[0], 2);
 }
 
-
 /************ TaskTableAdvanceTest ************/
 
 class TaskTableAdvanceTest : public ::testing::Test {
-protected:
+ protected:
     void
     SetUp() override {
-        TableFileSchemaPtr dummy = nullptr;
+        ms::TableFileSchemaPtr dummy = nullptr;
         for (uint64_t i = 0; i < 8; ++i) {
-            auto task = std::make_shared<TestTask>(dummy);
+            auto task = std::make_shared<ms::TestTask>(dummy);
             table1_.Put(task);
         }
 
-        table1_.Get(0)->state = TaskTableItemState::INVALID;
-        table1_.Get(1)->state = TaskTableItemState::START;
-        table1_.Get(2)->state = TaskTableItemState::LOADING;
-        table1_.Get(3)->state = TaskTableItemState::LOADED;
-        table1_.Get(4)->state = TaskTableItemState::EXECUTING;
-        table1_.Get(5)->state = TaskTableItemState::EXECUTED;
-        table1_.Get(6)->state = TaskTableItemState::MOVING;
-        table1_.Get(7)->state = TaskTableItemState::MOVED;
+        table1_.Get(0)->state = ms::TaskTableItemState::INVALID;
+        table1_.Get(1)->state = ms::TaskTableItemState::START;
+        table1_.Get(2)->state = ms::TaskTableItemState::LOADING;
+        table1_.Get(3)->state = ms::TaskTableItemState::LOADED;
+        table1_.Get(4)->state = ms::TaskTableItemState::EXECUTING;
+        table1_.Get(5)->state = ms::TaskTableItemState::EXECUTED;
+        table1_.Get(6)->state = ms::TaskTableItemState::MOVING;
+        table1_.Get(7)->state = ms::TaskTableItemState::MOVED;
     }
 
-    TaskTable table1_;
+    ms::TaskTable table1_;
 };
 
 TEST_F(TaskTableAdvanceTest, LOAD) {
-    std::vector<TaskTableItemState> before_state;
+    std::vector<ms::TaskTableItemState> before_state;
     for (auto &task : table1_) {
         before_state.push_back(task->state);
     }
@@ -369,8 +368,8 @@ TEST_F(TaskTableAdvanceTest, LOAD) {
     }
 
     for (size_t i = 0; i < table1_.Size(); ++i) {
-        if (before_state[i] == TaskTableItemState::START) {
-            ASSERT_EQ(table1_.Get(i)->state, TaskTableItemState::LOADING);
+        if (before_state[i] == ms::TaskTableItemState::START) {
+            ASSERT_EQ(table1_.Get(i)->state, ms::TaskTableItemState::LOADING);
         } else {
             ASSERT_EQ(table1_.Get(i)->state, before_state[i]);
         }
@@ -378,7 +377,7 @@ TEST_F(TaskTableAdvanceTest, LOAD) {
 }
 
 TEST_F(TaskTableAdvanceTest, LOADED) {
-    std::vector<TaskTableItemState> before_state;
+    std::vector<ms::TaskTableItemState> before_state;
     for (auto &task : table1_) {
         before_state.push_back(task->state);
     }
@@ -388,8 +387,8 @@ TEST_F(TaskTableAdvanceTest, LOADED) {
     }
 
     for (size_t i = 0; i < table1_.Size(); ++i) {
-        if (before_state[i] == TaskTableItemState::LOADING) {
-            ASSERT_EQ(table1_.Get(i)->state, TaskTableItemState::LOADED);
+        if (before_state[i] == ms::TaskTableItemState::LOADING) {
+            ASSERT_EQ(table1_.Get(i)->state, ms::TaskTableItemState::LOADED);
         } else {
             ASSERT_EQ(table1_.Get(i)->state, before_state[i]);
         }
@@ -397,7 +396,7 @@ TEST_F(TaskTableAdvanceTest, LOADED) {
 }
 
 TEST_F(TaskTableAdvanceTest, EXECUTE) {
-    std::vector<TaskTableItemState> before_state;
+    std::vector<ms::TaskTableItemState> before_state;
     for (auto &task : table1_) {
         before_state.push_back(task->state);
     }
@@ -407,8 +406,8 @@ TEST_F(TaskTableAdvanceTest, EXECUTE) {
     }
 
     for (size_t i = 0; i < table1_.Size(); ++i) {
-        if (before_state[i] == TaskTableItemState::LOADED) {
-            ASSERT_EQ(table1_.Get(i)->state, TaskTableItemState::EXECUTING);
+        if (before_state[i] == ms::TaskTableItemState::LOADED) {
+            ASSERT_EQ(table1_.Get(i)->state, ms::TaskTableItemState::EXECUTING);
         } else {
             ASSERT_EQ(table1_.Get(i)->state, before_state[i]);
         }
@@ -416,7 +415,7 @@ TEST_F(TaskTableAdvanceTest, EXECUTE) {
 }
 
 TEST_F(TaskTableAdvanceTest, EXECUTED) {
-    std::vector<TaskTableItemState> before_state;
+    std::vector<ms::TaskTableItemState> before_state;
     for (auto &task : table1_) {
         before_state.push_back(task->state);
     }
@@ -426,8 +425,8 @@ TEST_F(TaskTableAdvanceTest, EXECUTED) {
     }
 
     for (size_t i = 0; i < table1_.Size(); ++i) {
-        if (before_state[i] == TaskTableItemState::EXECUTING) {
-            ASSERT_EQ(table1_.Get(i)->state, TaskTableItemState::EXECUTED);
+        if (before_state[i] == ms::TaskTableItemState::EXECUTING) {
+            ASSERT_EQ(table1_.Get(i)->state, ms::TaskTableItemState::EXECUTED);
         } else {
             ASSERT_EQ(table1_.Get(i)->state, before_state[i]);
         }
@@ -435,7 +434,7 @@ TEST_F(TaskTableAdvanceTest, EXECUTED) {
 }
 
 TEST_F(TaskTableAdvanceTest, MOVE) {
-    std::vector<TaskTableItemState> before_state;
+    std::vector<ms::TaskTableItemState> before_state;
     for (auto &task : table1_) {
         before_state.push_back(task->state);
     }
@@ -445,8 +444,8 @@ TEST_F(TaskTableAdvanceTest, MOVE) {
     }
 
     for (size_t i = 0; i < table1_.Size(); ++i) {
-        if (before_state[i] == TaskTableItemState::LOADED) {
-            ASSERT_EQ(table1_.Get(i)->state, TaskTableItemState::MOVING);
+        if (before_state[i] == ms::TaskTableItemState::LOADED) {
+            ASSERT_EQ(table1_.Get(i)->state, ms::TaskTableItemState::MOVING);
         } else {
             ASSERT_EQ(table1_.Get(i)->state, before_state[i]);
         }
@@ -454,7 +453,7 @@ TEST_F(TaskTableAdvanceTest, MOVE) {
 }
 
 TEST_F(TaskTableAdvanceTest, MOVED) {
-    std::vector<TaskTableItemState> before_state;
+    std::vector<ms::TaskTableItemState> before_state;
     for (auto &task : table1_) {
         before_state.push_back(task->state);
     }
@@ -464,8 +463,8 @@ TEST_F(TaskTableAdvanceTest, MOVED) {
     }
 
     for (size_t i = 0; i < table1_.Size(); ++i) {
-        if (before_state[i] == TaskTableItemState::MOVING) {
-            ASSERT_EQ(table1_.Get(i)->state, TaskTableItemState::MOVED);
+        if (before_state[i] == ms::TaskTableItemState::MOVING) {
+            ASSERT_EQ(table1_.Get(i)->state, ms::TaskTableItemState::MOVED);
         } else {
             ASSERT_EQ(table1_.Get(i)->state, before_state[i]);
         }
diff --git a/cpp/unittest/server/cache_test.cpp b/cpp/unittest/server/cache_test.cpp
index 290caf4a97..056d60185a 100644
--- a/cpp/unittest/server/cache_test.cpp
+++ b/cpp/unittest/server/cache_test.cpp
@@ -21,41 +21,40 @@
 #include "utils/Error.h"
 #include "wrapper/VecIndex.h"
 
-using namespace zilliz::milvus;
-
 namespace {
 
-class InvalidCacheMgr : public cache::CacheMgr<cache::DataObjPtr> {
-public:
+namespace ms = zilliz::milvus;
+
+class InvalidCacheMgr : public ms::cache::CacheMgr<ms::cache::DataObjPtr> {
+ public:
     InvalidCacheMgr() {
     }
 };
 
-class LessItemCacheMgr : public cache::CacheMgr<cache::DataObjPtr> {
-public:
+class LessItemCacheMgr : public ms::cache::CacheMgr<ms::cache::DataObjPtr> {
+ public:
     LessItemCacheMgr() {
-        cache_ = std::make_shared<cache::Cache<cache::DataObjPtr>>(1UL << 12, 10);
+        cache_ = std::make_shared<ms::cache::Cache<ms::cache::DataObjPtr>>(1UL << 12, 10);
     }
 };
 
-class MockVecIndex : public engine::VecIndex {
-public:
+class MockVecIndex : public ms::engine::VecIndex {
+ public:
     MockVecIndex(int64_t dim, int64_t total)
         : dimension_(dim),
-          ntotal_(total){
-
+          ntotal_(total) {
     }
 
-    virtual Status BuildAll(const long &nb,
-                               const float *xb,
-                               const long *ids,
-                               const engine::Config &cfg,
-                               const long &nt = 0,
-                               const float *xt = nullptr) {
-        return Status();
+    virtual ms::Status BuildAll(const int64_t &nb,
+                                const float *xb,
+                                const int64_t *ids,
+                                const ms::engine::Config &cfg,
+                                const int64_t &nt = 0,
+                                const float *xt = nullptr) {
+        return ms::Status();
     }
 
-    engine::VecIndexPtr Clone() override {
+    ms::engine::VecIndexPtr Clone() override {
         return zilliz::milvus::engine::VecIndexPtr();
     }
 
@@ -63,31 +62,31 @@ public:
         return 0;
     }
 
-    engine::IndexType GetType() override {
-        return engine::IndexType::INVALID;
+    ms::engine::IndexType GetType() override {
+        return ms::engine::IndexType::INVALID;
     }
 
-    virtual Status Add(const long &nb,
-                          const float *xb,
-                          const long *ids,
-                          const engine::Config &cfg = engine::Config()) {
-        return Status();
+    virtual ms::Status Add(const int64_t &nb,
+                           const float *xb,
+                           const int64_t *ids,
+                           const ms::engine::Config &cfg = ms::engine::Config()) {
+        return ms::Status();
     }
 
-    virtual Status Search(const long &nq,
-                             const float *xq,
-                             float *dist,
-                             long *ids,
-                             const engine::Config &cfg = engine::Config()) {
-        return Status();
+    virtual ms::Status Search(const int64_t &nq,
+                              const float *xq,
+                              float *dist,
+                              int64_t *ids,
+                              const ms::engine::Config &cfg = ms::engine::Config()) {
+        return ms::Status();
     }
 
-    engine::VecIndexPtr CopyToGpu(const int64_t &device_id,
-                                  const engine::Config &cfg) override {
+    ms::engine::VecIndexPtr CopyToGpu(const int64_t &device_id,
+                                      const ms::engine::Config &cfg) override {
         return nullptr;
     }
 
-    engine::VecIndexPtr CopyToCpu(const engine::Config &cfg) override {
+    ms::engine::VecIndexPtr CopyToCpu(const ms::engine::Config &cfg) override {
         return nullptr;
     }
 
@@ -104,19 +103,19 @@ public:
         return binset;
     }
 
-    virtual Status Load(const zilliz::knowhere::BinarySet &index_binary) {
-        return Status();
+    virtual ms::Status Load(const zilliz::knowhere::BinarySet &index_binary) {
+        return ms::Status();
     }
 
-public:
+ public:
     int64_t dimension_ = 256;
     int64_t ntotal_ = 0;
 };
 
-}
+} // namespace
 
 TEST(CacheTest, DUMMY_TEST) {
-    engine::Config cfg;
+    ms::engine::Config cfg;
     MockVecIndex mock_index(256, 1000);
     mock_index.Dimension();
     mock_index.Count();
@@ -134,9 +133,9 @@ TEST(CacheTest, DUMMY_TEST) {
 }
 
 TEST(CacheTest, CPU_CACHE_TEST) {
-    auto cpu_mgr = cache::CpuCacheMgr::GetInstance();
+    auto cpu_mgr = ms::cache::CpuCacheMgr::GetInstance();
 
-    const int64_t gbyte = 1024*1024*1024;
+    const int64_t gbyte = 1024 * 1024 * 1024;
     int64_t g_num = 16;
     int64_t cap = g_num * gbyte;
     cpu_mgr->SetCapacity(cap);
@@ -145,8 +144,8 @@ TEST(CacheTest, CPU_CACHE_TEST) {
     uint64_t item_count = 20;
     for (uint64_t i = 0; i < item_count; i++) {
         //each vector is 1k byte, total size less than 1G
-        engine::VecIndexPtr mock_index = std::make_shared<MockVecIndex>(256, 1000000);
-        cache::DataObjPtr data_obj = std::make_shared<cache::DataObj>(mock_index);
+        ms::engine::VecIndexPtr mock_index = std::make_shared<MockVecIndex>(256, 1000000);
+        ms::cache::DataObjPtr data_obj = std::make_shared<ms::cache::DataObj>(mock_index);
         cpu_mgr->InsertItem("index_" + std::to_string(i), data_obj);
     }
     ASSERT_LT(cpu_mgr->ItemCount(), g_num);
@@ -169,8 +168,8 @@ TEST(CacheTest, CPU_CACHE_TEST) {
         cpu_mgr->SetCapacity(g_num * gbyte);
 
         //each vector is 1k byte, total size less than 6G
-        engine::VecIndexPtr mock_index = std::make_shared<MockVecIndex>(256, 6000000);
-        cache::DataObjPtr data_obj = std::make_shared<cache::DataObj>(mock_index);
+        ms::engine::VecIndexPtr mock_index = std::make_shared<MockVecIndex>(256, 6000000);
+        ms::cache::DataObjPtr data_obj = std::make_shared<ms::cache::DataObj>(mock_index);
         cpu_mgr->InsertItem("index_6g", data_obj);
         ASSERT_TRUE(cpu_mgr->ItemExists("index_6g"));
     }
@@ -179,12 +178,12 @@ TEST(CacheTest, CPU_CACHE_TEST) {
 }
 
 TEST(CacheTest, GPU_CACHE_TEST) {
-    auto gpu_mgr = cache::GpuCacheMgr::GetInstance(0);
+    auto gpu_mgr = ms::cache::GpuCacheMgr::GetInstance(0);
 
-    for(int i = 0; i < 20; i++) {
+    for (int i = 0; i < 20; i++) {
         //each vector is 1k byte
-        engine::VecIndexPtr mock_index = std::make_shared<MockVecIndex>(256, 1000);
-        cache::DataObjPtr data_obj = std::make_shared<cache::DataObj>(mock_index);
+        ms::engine::VecIndexPtr mock_index = std::make_shared<MockVecIndex>(256, 1000);
+        ms::cache::DataObjPtr data_obj = std::make_shared<ms::cache::DataObj>(mock_index);
         gpu_mgr->InsertItem("index_" + std::to_string(i), data_obj);
     }
 
@@ -196,15 +195,14 @@ TEST(CacheTest, GPU_CACHE_TEST) {
     for (auto i = 0; i < 3; i++) {
         // TODO: use gpu index to mock
         //each vector is 1k byte, total size less than 2G
-        engine::VecIndexPtr mock_index = std::make_shared<MockVecIndex>(256, 2000000);
-        cache::DataObjPtr data_obj = std::make_shared<cache::DataObj>(mock_index);
-        std::cout << data_obj->size() <<std::endl;
+        ms::engine::VecIndexPtr mock_index = std::make_shared<MockVecIndex>(256, 2000000);
+        ms::cache::DataObjPtr data_obj = std::make_shared<ms::cache::DataObj>(mock_index);
+        std::cout << data_obj->size() << std::endl;
         gpu_mgr->InsertItem("index_" + std::to_string(i), data_obj);
     }
 
     gpu_mgr->ClearCache();
     ASSERT_EQ(gpu_mgr->ItemCount(), 0);
-
 }
 
 TEST(CacheTest, INVALID_TEST) {
@@ -214,7 +212,7 @@ TEST(CacheTest, INVALID_TEST) {
         ASSERT_FALSE(mgr.ItemExists("test"));
         ASSERT_EQ(mgr.GetItem("test"), nullptr);
 
-        mgr.InsertItem("test", cache::DataObjPtr());
+        mgr.InsertItem("test", ms::cache::DataObjPtr());
         mgr.InsertItem("test", nullptr);
         mgr.EraseItem("test");
         mgr.PrintInfo();
@@ -226,12 +224,12 @@ TEST(CacheTest, INVALID_TEST) {
 
     {
         LessItemCacheMgr mgr;
-        for(int i = 0; i < 20; i++) {
+        for (int i = 0; i < 20; i++) {
             //each vector is 1k byte
-            engine::VecIndexPtr mock_index = std::make_shared<MockVecIndex>(256, 2);
-            cache::DataObjPtr data_obj = std::make_shared<cache::DataObj>(mock_index);
+            ms::engine::VecIndexPtr mock_index = std::make_shared<MockVecIndex>(256, 2);
+            ms::cache::DataObjPtr data_obj = std::make_shared<ms::cache::DataObj>(mock_index);
             mgr.InsertItem("index_" + std::to_string(i), data_obj);
         }
         ASSERT_EQ(mgr.GetItem("index_0"), nullptr);
     }
-}
\ No newline at end of file
+}
diff --git a/cpp/unittest/server/config_test.cpp b/cpp/unittest/server/config_test.cpp
index b27d1e60c8..0c613d8954 100644
--- a/cpp/unittest/server/config_test.cpp
+++ b/cpp/unittest/server/config_test.cpp
@@ -23,39 +23,39 @@
 #include "utils/ValidationUtil.h"
 #include "server/Config.h"
 
-using namespace zilliz::milvus;
-
 namespace {
 
-static const char* CONFIG_FILE_PATH = "./milvus/conf/server_config.yaml";
-static const char* LOG_FILE_PATH = "./milvus/conf/log_config.conf";
+namespace ms = zilliz::milvus;
+
+static const char *CONFIG_FILE_PATH = "./milvus/conf/server_config.yaml";
+static const char *LOG_FILE_PATH = "./milvus/conf/log_config.conf";
 
 static constexpr uint64_t KB = 1024;
-static constexpr uint64_t MB = KB*1024;
-static constexpr uint64_t GB = MB*1024;
+static constexpr uint64_t MB = KB * 1024;
+static constexpr uint64_t GB = MB * 1024;
 
-}
+} // namespace
 
 TEST(ConfigTest, CONFIG_TEST) {
-    server::ConfigMgr* config_mgr = server::ConfigMgr::GetInstance();
+    ms::server::ConfigMgr *config_mgr = ms::server::ConfigMgr::GetInstance();
 
-    ErrorCode err = config_mgr->LoadConfigFile("");
-    ASSERT_EQ(err, SERVER_UNEXPECTED_ERROR);
+    ms::ErrorCode err = config_mgr->LoadConfigFile("");
+    ASSERT_EQ(err, ms::SERVER_UNEXPECTED_ERROR);
 
     err = config_mgr->LoadConfigFile(LOG_FILE_PATH);
-    ASSERT_EQ(err, SERVER_UNEXPECTED_ERROR);
+    ASSERT_EQ(err, ms::SERVER_UNEXPECTED_ERROR);
 
     err = config_mgr->LoadConfigFile(CONFIG_FILE_PATH);
-    ASSERT_EQ(err, SERVER_SUCCESS);
+    ASSERT_EQ(err, ms::SERVER_SUCCESS);
 
     config_mgr->Print();
 
-    server::ConfigNode& root_config = config_mgr->GetRootNode();
-    server::ConfigNode& server_config = root_config.GetChild("server_config");
-    server::ConfigNode& db_config = root_config.GetChild("db_config");
-    server::ConfigNode& metric_config = root_config.GetChild("metric_config");
-    server::ConfigNode& cache_config = root_config.GetChild("cache_config");
-    server::ConfigNode invalid_config = root_config.GetChild("invalid_config");
+    ms::server::ConfigNode &root_config = config_mgr->GetRootNode();
+    ms::server::ConfigNode &server_config = root_config.GetChild("server_config");
+    ms::server::ConfigNode &db_config = root_config.GetChild("db_config");
+    ms::server::ConfigNode &metric_config = root_config.GetChild("metric_config");
+    ms::server::ConfigNode &cache_config = root_config.GetChild("cache_config");
+    ms::server::ConfigNode invalid_config = root_config.GetChild("invalid_config");
     auto valus = invalid_config.GetSequence("not_exist");
     float ff = invalid_config.GetFloatValue("not_exist", 3.0);
     ASSERT_EQ(ff, 3.0);
@@ -63,16 +63,16 @@ TEST(ConfigTest, CONFIG_TEST) {
     std::string address = server_config.GetValue("address");
     ASSERT_TRUE(!address.empty());
     int64_t port = server_config.GetInt64Value("port");
-    ASSERT_TRUE(port != 0);
+    ASSERT_NE(port, 0);
 
     server_config.SetValue("test", "2.5");
     double test = server_config.GetDoubleValue("test");
     ASSERT_EQ(test, 2.5);
 
-    server::ConfigNode fake;
+    ms::server::ConfigNode fake;
     server_config.AddChild("fake", fake);
     fake = server_config.GetChild("fake");
-    server::ConfigNodeArr arr;
+    ms::server::ConfigNodeArr arr;
     server_config.GetChildren(arr);
     ASSERT_EQ(arr.size(), 1UL);
 
@@ -89,7 +89,7 @@ TEST(ConfigTest, CONFIG_TEST) {
     auto seq = server_config.GetSequence("seq");
     ASSERT_EQ(seq.size(), 2UL);
 
-    server::ConfigNode combine;
+    ms::server::ConfigNode combine;
     combine.Combine(server_config);
 
     combine.PrintAll();
@@ -102,8 +102,8 @@ TEST(ConfigTest, CONFIG_TEST) {
 }
 
 TEST(ConfigTest, SERVER_CONFIG_TEST) {
-    server::Config& config = server::Config::GetInstance();
-    Status s = config.LoadConfigFile(CONFIG_FILE_PATH);
+    ms::server::Config &config = ms::server::Config::GetInstance();
+    ms::Status s = config.LoadConfigFile(CONFIG_FILE_PATH);
     ASSERT_TRUE(s.ok());
 
     s = config.ValidateConfig();
@@ -113,4 +113,4 @@ TEST(ConfigTest, SERVER_CONFIG_TEST) {
 
     s = config.ResetDefaultConfig();
     ASSERT_TRUE(s.ok());
-}
\ No newline at end of file
+}
diff --git a/cpp/unittest/server/rpc_test.cpp b/cpp/unittest/server/rpc_test.cpp
index 0eaadf6146..3a36e3ee50 100644
--- a/cpp/unittest/server/rpc_test.cpp
+++ b/cpp/unittest/server/rpc_test.cpp
@@ -23,7 +23,7 @@
 #include "server/grpc_impl/GrpcRequestHandler.h"
 #include "server/grpc_impl/GrpcRequestScheduler.h"
 #include "server/grpc_impl/GrpcRequestTask.h"
-#include "version.h"
+#include "../version.h"
 
 #include "grpc/gen-milvus/milvus.grpc.pb.h"
 #include "grpc/gen-status/status.pb.h"
@@ -34,10 +34,10 @@
 #include "scheduler/ResourceFactory.h"
 #include "utils/CommonUtil.h"
 
-using namespace zilliz::milvus;
-
 namespace {
 
+namespace ms = zilliz::milvus;
+
 static const char *TABLE_NAME = "test_grpc";
 static constexpr int64_t TABLE_DIM = 256;
 static constexpr int64_t INDEX_FILE_SIZE = 1024;
@@ -49,30 +49,29 @@ class RpcHandlerTest : public testing::Test {
  protected:
     void
     SetUp() override {
-
-        auto res_mgr = scheduler::ResMgrInst::GetInstance();
+        auto res_mgr = ms::scheduler::ResMgrInst::GetInstance();
         res_mgr->Clear();
-        res_mgr->Add(scheduler::ResourceFactory::Create("disk", "DISK", 0, true, false));
-        res_mgr->Add(scheduler::ResourceFactory::Create("cpu", "CPU", 0, true, true));
-        res_mgr->Add(scheduler::ResourceFactory::Create("gtx1660", "GPU", 0, true, true));
+        res_mgr->Add(ms::scheduler::ResourceFactory::Create("disk", "DISK", 0, true, false));
+        res_mgr->Add(ms::scheduler::ResourceFactory::Create("cpu", "CPU", 0, true, true));
+        res_mgr->Add(ms::scheduler::ResourceFactory::Create("gtx1660", "GPU", 0, true, true));
 
-        auto default_conn = scheduler::Connection("IO", 500.0);
-        auto PCIE = scheduler::Connection("IO", 11000.0);
+        auto default_conn = ms::scheduler::Connection("IO", 500.0);
+        auto PCIE = ms::scheduler::Connection("IO", 11000.0);
         res_mgr->Connect("disk", "cpu", default_conn);
         res_mgr->Connect("cpu", "gtx1660", PCIE);
         res_mgr->Start();
-        scheduler::SchedInst::GetInstance()->Start();
-        scheduler::JobMgrInst::GetInstance()->Start();
+        ms::scheduler::SchedInst::GetInstance()->Start();
+        ms::scheduler::JobMgrInst::GetInstance()->Start();
 
-        engine::DBOptions opt;
+        ms::engine::DBOptions opt;
 
-        server::Config::GetInstance().SetDBConfigBackendUrl("sqlite://:@:/");
-        server::Config::GetInstance().SetDBConfigPrimaryPath("/tmp/milvus_test");
-        server::Config::GetInstance().SetDBConfigSecondaryPath("");
-        server::Config::GetInstance().SetDBConfigArchiveDiskThreshold("");
-        server::Config::GetInstance().SetDBConfigArchiveDaysThreshold("");
-        server::Config::GetInstance().SetCacheConfigCacheInsertData("");
-        server::Config::GetInstance().SetEngineConfigOmpThreadNum("");
+        ms::server::Config::GetInstance().SetDBConfigBackendUrl("sqlite://:@:/");
+        ms::server::Config::GetInstance().SetDBConfigPrimaryPath("/tmp/milvus_test");
+        ms::server::Config::GetInstance().SetDBConfigSecondaryPath("");
+        ms::server::Config::GetInstance().SetDBConfigArchiveDiskThreshold("");
+        ms::server::Config::GetInstance().SetDBConfigArchiveDaysThreshold("");
+        ms::server::Config::GetInstance().SetCacheConfigCacheInsertData("");
+        ms::server::Config::GetInstance().SetEngineConfigOmpThreadNum("");
 
 //        serverConfig.SetValue(server::CONFIG_CLUSTER_MODE, "cluster");
 //        DBWrapper::GetInstance().GetInstance().StartService();
@@ -82,11 +81,11 @@ class RpcHandlerTest : public testing::Test {
 //        DBWrapper::GetInstance().GetInstance().StartService();
 //        DBWrapper::GetInstance().GetInstance().StopService();
 
-        server::Config::GetInstance().SetResourceConfigMode("single");
-        server::DBWrapper::GetInstance().StartService();
+        ms::server::Config::GetInstance().SetResourceConfigMode("single");
+        ms::server::DBWrapper::GetInstance().StartService();
 
         //initialize handler, create table
-        handler = std::make_shared<server::grpc::GrpcRequestHandler>();
+        handler = std::make_shared<ms::server::grpc::GrpcRequestHandler>();
         ::grpc::ServerContext context;
         ::milvus::grpc::TableSchema request;
         ::milvus::grpc::Status status;
@@ -99,18 +98,20 @@ class RpcHandlerTest : public testing::Test {
 
     void
     TearDown() override {
-        server::DBWrapper::GetInstance().StopService();
-        scheduler::JobMgrInst::GetInstance()->Stop();
-        scheduler::ResMgrInst::GetInstance()->Stop();
-        scheduler::SchedInst::GetInstance()->Stop();
+        ms::server::DBWrapper::GetInstance().StopService();
+        ms::scheduler::JobMgrInst::GetInstance()->Stop();
+        ms::scheduler::ResMgrInst::GetInstance()->Stop();
+        ms::scheduler::SchedInst::GetInstance()->Stop();
         boost::filesystem::remove_all("/tmp/milvus_test");
     }
+
  protected:
-    std::shared_ptr<server::grpc::GrpcRequestHandler> handler;
+    std::shared_ptr<ms::server::grpc::GrpcRequestHandler> handler;
 };
 
-void BuildVectors(int64_t from, int64_t to,
-                  std::vector<std::vector<float >> &vector_record_array) {
+void
+BuildVectors(int64_t from, int64_t to,
+             std::vector<std::vector<float >> &vector_record_array) {
     if (to <= from) {
         return;
     }
@@ -127,20 +128,22 @@ void BuildVectors(int64_t from, int64_t to,
     }
 }
 
-std::string CurrentTmDate(int64_t offset_day = 0) {
+std::string
+CurrentTmDate(int64_t offset_day = 0) {
     time_t tt;
     time(&tt);
     tt = tt + 8 * SECONDS_EACH_HOUR;
     tt = tt + 24 * SECONDS_EACH_HOUR * offset_day;
-    tm *t = gmtime(&tt);
+    tm t;
+    gmtime_r(&tt, &t);
 
-    std::string str = std::to_string(t->tm_year + 1900) + "-" + std::to_string(t->tm_mon + 1)
-        + "-" + std::to_string(t->tm_mday);
+    std::string str = std::to_string(t.tm_year + 1900) + "-" + std::to_string(t.tm_mon + 1)
+        + "-" + std::to_string(t.tm_mday);
 
     return str;
 }
 
-}
+} // namespace
 
 TEST_F(RpcHandlerTest, HAS_TABLE_TEST) {
     ::grpc::ServerContext context;
@@ -311,7 +314,6 @@ TEST_F(RpcHandlerTest, TABLES_TEST) {
     ::grpc::Status status = handler->DescribeTable(&context, &table_name, &table_schema);
     ASSERT_EQ(status.error_code(), ::grpc::Status::OK.error_code());
 
-
     ::milvus::grpc::InsertParam request;
     std::vector<std::vector<float>> record_array;
     BuildVectors(0, VECTOR_COUNT, record_array);
@@ -419,31 +421,29 @@ TEST_F(RpcHandlerTest, DELETE_BY_RANGE_TEST) {
     grpc_status = handler->DeleteByRange(&context, &request, &status);
     request.mutable_range()->set_end_value(CurrentTmDate(-2));
     grpc_status = handler->DeleteByRange(&context, &request, &status);
-
 }
 
 //////////////////////////////////////////////////////////////////////
 namespace {
-class DummyTask : public server::grpc::GrpcBaseTask {
-public:
-    Status
+class DummyTask : public ms::server::grpc::GrpcBaseTask {
+ public:
+    ms::Status
     OnExecute() override {
-        return Status::OK();
+        return ms::Status::OK();
     }
 
-    static server::grpc::BaseTaskPtr
+    static ms::server::grpc::BaseTaskPtr
     Create(std::string &dummy) {
-        return std::shared_ptr<server::grpc::GrpcBaseTask>(new DummyTask(dummy));
+        return std::shared_ptr<ms::server::grpc::GrpcBaseTask>(new DummyTask(dummy));
     }
 
-public:
+ public:
     explicit DummyTask(std::string &dummy) : GrpcBaseTask(dummy) {
-
     }
 };
 
 class RpcSchedulerTest : public testing::Test {
-protected:
+ protected:
     void
     SetUp() override {
         std::string dummy = "dql";
@@ -453,22 +453,22 @@ protected:
     std::shared_ptr<DummyTask> task_ptr;
 };
 
-}
+} // namespace
 
-TEST_F(RpcSchedulerTest, BASE_TASK_TEST){
+TEST_F(RpcSchedulerTest, BASE_TASK_TEST) {
     auto status = task_ptr->Execute();
     ASSERT_TRUE(status.ok());
 
-    server::grpc::GrpcRequestScheduler::GetInstance().Start();
+    ms::server::grpc::GrpcRequestScheduler::GetInstance().Start();
     ::milvus::grpc::Status grpc_status;
     std::string dummy = "dql";
-    server::grpc::BaseTaskPtr base_task_ptr = DummyTask::Create(dummy);
-    server::grpc::GrpcRequestScheduler::GetInstance().ExecTask(base_task_ptr, &grpc_status);
+    ms::server::grpc::BaseTaskPtr base_task_ptr = DummyTask::Create(dummy);
+    ms::server::grpc::GrpcRequestScheduler::GetInstance().ExecTask(base_task_ptr, &grpc_status);
 
-    server::grpc::GrpcRequestScheduler::GetInstance().ExecuteTask(task_ptr);
+    ms::server::grpc::GrpcRequestScheduler::GetInstance().ExecuteTask(task_ptr);
     task_ptr = nullptr;
-    server::grpc::GrpcRequestScheduler::GetInstance().ExecuteTask(task_ptr);
+    ms::server::grpc::GrpcRequestScheduler::GetInstance().ExecuteTask(task_ptr);
 
-    server::grpc::GrpcRequestScheduler::GetInstance().Stop();
+    ms::server::grpc::GrpcRequestScheduler::GetInstance().Stop();
 }
 
diff --git a/cpp/unittest/server/util_test.cpp b/cpp/unittest/server/util_test.cpp
index 1757a7ddfe..89095193fb 100644
--- a/cpp/unittest/server/util_test.cpp
+++ b/cpp/unittest/server/util_test.cpp
@@ -31,75 +31,76 @@
 #include <boost/filesystem.hpp>
 #include <gtest/gtest.h>
 
-using namespace zilliz::milvus;
-
 namespace {
 
-static const char* LOG_FILE_PATH = "./milvus/conf/log_config.conf";
+namespace ms = zilliz::milvus;
 
-void CopyStatus(Status& st1, Status& st2) {
+static const char *LOG_FILE_PATH = "./milvus/conf/log_config.conf";
+
+void
+CopyStatus(ms::Status &st1, ms::Status &st2) {
     st1 = st2;
 }
 
-}
+} // namespace
 
 TEST(UtilTest, EXCEPTION_TEST) {
     std::string err_msg = "failed";
-    server::ServerException ex(SERVER_UNEXPECTED_ERROR, err_msg);
-    ASSERT_EQ(ex.error_code(), SERVER_UNEXPECTED_ERROR);
+    ms::server::ServerException ex(ms::SERVER_UNEXPECTED_ERROR, err_msg);
+    ASSERT_EQ(ex.error_code(), ms::SERVER_UNEXPECTED_ERROR);
     std::string msg = ex.what();
     ASSERT_EQ(msg, err_msg);
 }
 
 TEST(UtilTest, SIGNAL_TEST) {
-    server::SignalUtil::PrintStacktrace();
+    ms::server::SignalUtil::PrintStacktrace();
 }
 
 TEST(UtilTest, COMMON_TEST) {
-    unsigned long total_mem = 0, free_mem = 0;
-    server::CommonUtil::GetSystemMemInfo(total_mem, free_mem);
+    uint64_t total_mem = 0, free_mem = 0;
+    ms::server::CommonUtil::GetSystemMemInfo(total_mem, free_mem);
     ASSERT_GT(total_mem, 0);
     ASSERT_GT(free_mem, 0);
 
-    unsigned int thread_cnt = 0;
-    server::CommonUtil::GetSystemAvailableThreads(thread_cnt);
+    uint32_t thread_cnt = 0;
+    ms::server::CommonUtil::GetSystemAvailableThreads(thread_cnt);
     ASSERT_GT(thread_cnt, 0);
 
     std::string path1 = "/tmp/milvus_test/";
     std::string path2 = path1 + "common_test_12345/";
     std::string path3 = path2 + "abcdef";
-    Status status = server::CommonUtil::CreateDirectory(path3);
+    ms::Status status = ms::server::CommonUtil::CreateDirectory(path3);
     ASSERT_TRUE(status.ok());
     //test again
-    status = server::CommonUtil::CreateDirectory(path3);
+    status = ms::server::CommonUtil::CreateDirectory(path3);
     ASSERT_TRUE(status.ok());
 
-    ASSERT_TRUE(server::CommonUtil::IsDirectoryExist(path3));
+    ASSERT_TRUE(ms::server::CommonUtil::IsDirectoryExist(path3));
 
-    status = server::CommonUtil::DeleteDirectory(path1);
+    status = ms::server::CommonUtil::DeleteDirectory(path1);
     ASSERT_TRUE(status.ok());
     //test again
-    status = server::CommonUtil::DeleteDirectory(path1);
+    status = ms::server::CommonUtil::DeleteDirectory(path1);
     ASSERT_TRUE(status.ok());
 
-    ASSERT_FALSE(server::CommonUtil::IsDirectoryExist(path1));
-    ASSERT_FALSE(server::CommonUtil::IsFileExist(path1));
+    ASSERT_FALSE(ms::server::CommonUtil::IsDirectoryExist(path1));
+    ASSERT_FALSE(ms::server::CommonUtil::IsFileExist(path1));
 
-    std::string exe_path = server::CommonUtil::GetExePath();
+    std::string exe_path = ms::server::CommonUtil::GetExePath();
     ASSERT_FALSE(exe_path.empty());
 
     time_t tt;
-    time( &tt );
+    time(&tt);
     tm time_struct;
     memset(&time_struct, 0, sizeof(tm));
-    server::CommonUtil::ConvertTime(tt, time_struct);
+    ms::server::CommonUtil::ConvertTime(tt, time_struct);
     ASSERT_GT(time_struct.tm_year, 0);
     ASSERT_GT(time_struct.tm_mon, 0);
     ASSERT_GT(time_struct.tm_mday, 0);
-    server::CommonUtil::ConvertTime(time_struct, tt);
+    ms::server::CommonUtil::ConvertTime(time_struct, tt);
     ASSERT_GT(tt, 0);
 
-    bool res = server::CommonUtil::TimeStrToTime("2019-03-23", tt, time_struct);
+    bool res = ms::server::CommonUtil::TimeStrToTime("2019-03-23", tt, time_struct);
     ASSERT_EQ(time_struct.tm_year, 119);
     ASSERT_EQ(time_struct.tm_mon, 2);
     ASSERT_EQ(time_struct.tm_mday, 23);
@@ -109,45 +110,43 @@ TEST(UtilTest, COMMON_TEST) {
 
 TEST(UtilTest, STRINGFUNCTIONS_TEST) {
     std::string str = " test zilliz";
-    server::StringHelpFunctions::TrimStringBlank(str);
+    ms::server::StringHelpFunctions::TrimStringBlank(str);
     ASSERT_EQ(str, "test zilliz");
 
     str = "\"test zilliz\"";
-    server::StringHelpFunctions::TrimStringQuote(str, "\"");
+    ms::server::StringHelpFunctions::TrimStringQuote(str, "\"");
     ASSERT_EQ(str, "test zilliz");
 
     str = "a,b,c";
     std::vector<std::string> result;
-    auto status = server::StringHelpFunctions::SplitStringByDelimeter(str , ",", result);
+    auto status = ms::server::StringHelpFunctions::SplitStringByDelimeter(str, ",", result);
     ASSERT_TRUE(status.ok());
     ASSERT_EQ(result.size(), 3UL);
 
     result.clear();
-    status = server::StringHelpFunctions::SplitStringByQuote(str , ",", "\"", result);
+    status = ms::server::StringHelpFunctions::SplitStringByQuote(str, ",", "\"", result);
     ASSERT_TRUE(status.ok());
     ASSERT_EQ(result.size(), 3UL);
 
     result.clear();
-    status = server::StringHelpFunctions::SplitStringByQuote(str , ",", "", result);
+    status = ms::server::StringHelpFunctions::SplitStringByQuote(str, ",", "", result);
     ASSERT_TRUE(status.ok());
     ASSERT_EQ(result.size(), 3UL);
 
     str = "55,\"aa,gg,yy\",b";
     result.clear();
-    status = server::StringHelpFunctions::SplitStringByQuote(str , ",", "\"", result);
+    status = ms::server::StringHelpFunctions::SplitStringByQuote(str, ",", "\"", result);
     ASSERT_TRUE(status.ok());
     ASSERT_EQ(result.size(), 3UL);
-
-
 }
 
 TEST(UtilTest, BLOCKINGQUEUE_TEST) {
-    server::BlockingQueue<std::string> bq;
+    ms::server::BlockingQueue<std::string> bq;
 
     static const size_t count = 10;
     bq.SetCapacity(count);
 
-    for(size_t i = 1; i <= count; i++) {
+    for (size_t i = 1; i <= count; i++) {
         std::string id = "No." + std::to_string(i);
         bq.Put(id);
     }
@@ -161,7 +160,7 @@ TEST(UtilTest, BLOCKINGQUEUE_TEST) {
     str = bq.Back();
     ASSERT_EQ(str, "No." + std::to_string(count));
 
-    for(size_t i = 1; i <= count; i++) {
+    for (size_t i = 1; i <= count; i++) {
         std::string id = "No." + std::to_string(i);
         str = bq.Take();
         ASSERT_EQ(id, str);
@@ -171,54 +170,54 @@ TEST(UtilTest, BLOCKINGQUEUE_TEST) {
 }
 
 TEST(UtilTest, LOG_TEST) {
-    auto status = server::InitLog(LOG_FILE_PATH);
+    auto status = ms::server::InitLog(LOG_FILE_PATH);
     ASSERT_TRUE(status.ok());
 
     EXPECT_FALSE(el::Loggers::hasFlag(el::LoggingFlag::NewLineForContainer));
     EXPECT_FALSE(el::Loggers::hasFlag(el::LoggingFlag::LogDetailedCrashReason));
 
-    std::string fname = server::CommonUtil::GetFileName(LOG_FILE_PATH);
+    std::string fname = ms::server::CommonUtil::GetFileName(LOG_FILE_PATH);
     ASSERT_EQ(fname, "log_config.conf");
 }
 
 TEST(UtilTest, TIMERECORDER_TEST) {
-    for(int64_t log_level = 0; log_level <= 6; log_level++) {
-        if(log_level == 5) {
+    for (int64_t log_level = 0; log_level <= 6; log_level++) {
+        if (log_level == 5) {
             continue; //skip fatal
         }
-        TimeRecorder rc("time", log_level);
+        ms::TimeRecorder rc("time", log_level);
         rc.RecordSection("end");
     }
 }
 
 TEST(UtilTest, STATUS_TEST) {
-    auto status = Status::OK();
+    auto status = ms::Status::OK();
     std::string str = status.ToString();
     ASSERT_FALSE(str.empty());
 
-    status = Status(DB_ERROR, "mistake");
-    ASSERT_EQ(status.code(), DB_ERROR);
+    status = ms::Status(ms::DB_ERROR, "mistake");
+    ASSERT_EQ(status.code(), ms::DB_ERROR);
     str = status.ToString();
     ASSERT_FALSE(str.empty());
 
-    status = Status(DB_NOT_FOUND, "mistake");
-    ASSERT_EQ(status.code(), DB_NOT_FOUND);
+    status = ms::Status(ms::DB_NOT_FOUND, "mistake");
+    ASSERT_EQ(status.code(), ms::DB_NOT_FOUND);
     str = status.ToString();
     ASSERT_FALSE(str.empty());
 
-    status = Status(DB_ALREADY_EXIST, "mistake");
-    ASSERT_EQ(status.code(), DB_ALREADY_EXIST);
+    status = ms::Status(ms::DB_ALREADY_EXIST, "mistake");
+    ASSERT_EQ(status.code(), ms::DB_ALREADY_EXIST);
     str = status.ToString();
     ASSERT_FALSE(str.empty());
 
-    status = Status(DB_META_TRANSACTION_FAILED, "mistake");
-    ASSERT_EQ(status.code(), DB_META_TRANSACTION_FAILED);
+    status = ms::Status(ms::DB_META_TRANSACTION_FAILED, "mistake");
+    ASSERT_EQ(status.code(), ms::DB_META_TRANSACTION_FAILED);
     str = status.ToString();
     ASSERT_FALSE(str.empty());
 
-    auto status_copy = Status::OK();
+    auto status_copy = ms::Status::OK();
     CopyStatus(status_copy, status);
-    ASSERT_EQ(status.code(), DB_META_TRANSACTION_FAILED);
+    ASSERT_EQ(status.code(), ms::DB_META_TRANSACTION_FAILED);
 
     auto status_ref(status);
     ASSERT_EQ(status_ref.code(), status.code());
@@ -231,123 +230,140 @@ TEST(UtilTest, STATUS_TEST) {
 
 TEST(ValidationUtilTest, VALIDATE_TABLENAME_TEST) {
     std::string table_name = "Normal123_";
-    auto status = server::ValidationUtil::ValidateTableName(table_name);
+    auto status = ms::server::ValidationUtil::ValidateTableName(table_name);
     ASSERT_TRUE(status.ok());
 
     table_name = "12sds";
-    status = server::ValidationUtil::ValidateTableName(table_name);
-    ASSERT_EQ(status.code(), SERVER_INVALID_TABLE_NAME);
+    status = ms::server::ValidationUtil::ValidateTableName(table_name);
+    ASSERT_EQ(status.code(), ms::SERVER_INVALID_TABLE_NAME);
 
     table_name = "";
-    status = server::ValidationUtil::ValidateTableName(table_name);
-    ASSERT_EQ(status.code(), SERVER_INVALID_TABLE_NAME);
+    status = ms::server::ValidationUtil::ValidateTableName(table_name);
+    ASSERT_EQ(status.code(), ms::SERVER_INVALID_TABLE_NAME);
 
     table_name = "_asdasd";
-    status = server::ValidationUtil::ValidateTableName(table_name);
-    ASSERT_EQ(status.code(), SERVER_SUCCESS);
+    status = ms::server::ValidationUtil::ValidateTableName(table_name);
+    ASSERT_EQ(status.code(), ms::SERVER_SUCCESS);
 
     table_name = "!@#!@";
-    status = server::ValidationUtil::ValidateTableName(table_name);
-    ASSERT_EQ(status.code(), SERVER_INVALID_TABLE_NAME);
+    status = ms::server::ValidationUtil::ValidateTableName(table_name);
+    ASSERT_EQ(status.code(), ms::SERVER_INVALID_TABLE_NAME);
 
     table_name = "_!@#!@";
-    status = server::ValidationUtil::ValidateTableName(table_name);
-    ASSERT_EQ(status.code(), SERVER_INVALID_TABLE_NAME);
+    status = ms::server::ValidationUtil::ValidateTableName(table_name);
+    ASSERT_EQ(status.code(), ms::SERVER_INVALID_TABLE_NAME);
 
     table_name = "中文";
-    status = server::ValidationUtil::ValidateTableName(table_name);
-    ASSERT_EQ(status.code(), SERVER_INVALID_TABLE_NAME);
+    status = ms::server::ValidationUtil::ValidateTableName(table_name);
+    ASSERT_EQ(status.code(), ms::SERVER_INVALID_TABLE_NAME);
 
     table_name = std::string(10000, 'a');
-    status = server::ValidationUtil::ValidateTableName(table_name);
-    ASSERT_EQ(status.code(), SERVER_INVALID_TABLE_NAME);
+    status = ms::server::ValidationUtil::ValidateTableName(table_name);
+    ASSERT_EQ(status.code(), ms::SERVER_INVALID_TABLE_NAME);
 }
 
 TEST(ValidationUtilTest, VALIDATE_DIMENSION_TEST) {
-    ASSERT_EQ(server::ValidationUtil::ValidateTableDimension(-1).code(), SERVER_INVALID_VECTOR_DIMENSION);
-    ASSERT_EQ(server::ValidationUtil::ValidateTableDimension(0).code(), SERVER_INVALID_VECTOR_DIMENSION);
-    ASSERT_EQ(server::ValidationUtil::ValidateTableDimension(16385).code(), SERVER_INVALID_VECTOR_DIMENSION);
-    ASSERT_EQ(server::ValidationUtil::ValidateTableDimension(16384).code(), SERVER_SUCCESS);
-    ASSERT_EQ(server::ValidationUtil::ValidateTableDimension(1).code(), SERVER_SUCCESS);
+    ASSERT_EQ(ms::server::ValidationUtil::ValidateTableDimension(-1).code(), ms::SERVER_INVALID_VECTOR_DIMENSION);
+    ASSERT_EQ(ms::server::ValidationUtil::ValidateTableDimension(0).code(), ms::SERVER_INVALID_VECTOR_DIMENSION);
+    ASSERT_EQ(ms::server::ValidationUtil::ValidateTableDimension(16385).code(), ms::SERVER_INVALID_VECTOR_DIMENSION);
+    ASSERT_EQ(ms::server::ValidationUtil::ValidateTableDimension(16384).code(), ms::SERVER_SUCCESS);
+    ASSERT_EQ(ms::server::ValidationUtil::ValidateTableDimension(1).code(), ms::SERVER_SUCCESS);
 }
 
 TEST(ValidationUtilTest, VALIDATE_INDEX_TEST) {
-    ASSERT_EQ(server::ValidationUtil::ValidateTableIndexType((int)engine::EngineType::INVALID).code(), SERVER_INVALID_INDEX_TYPE);
-    for(int i = 1; i <= (int)engine::EngineType::MAX_VALUE; i++) {
-        ASSERT_EQ(server::ValidationUtil::ValidateTableIndexType(i).code(), SERVER_SUCCESS);
+    ASSERT_EQ(ms::server::ValidationUtil::ValidateTableIndexType((int) ms::engine::EngineType::INVALID).code(),
+              ms::SERVER_INVALID_INDEX_TYPE);
+    for (int i = 1; i <= (int) ms::engine::EngineType::MAX_VALUE; i++) {
+        ASSERT_EQ(ms::server::ValidationUtil::ValidateTableIndexType(i).code(), ms::SERVER_SUCCESS);
     }
-    ASSERT_EQ(server::ValidationUtil::ValidateTableIndexType((int)engine::EngineType::MAX_VALUE + 1).code(), SERVER_INVALID_INDEX_TYPE);
+    ASSERT_EQ(ms::server::ValidationUtil::ValidateTableIndexType((int) ms::engine::EngineType::MAX_VALUE + 1).code(),
+              ms::SERVER_INVALID_INDEX_TYPE);
 
-    ASSERT_EQ(server::ValidationUtil::ValidateTableIndexNlist(0).code(), SERVER_INVALID_INDEX_NLIST);
-    ASSERT_EQ(server::ValidationUtil::ValidateTableIndexNlist(100).code(), SERVER_SUCCESS);
+    ASSERT_EQ(ms::server::ValidationUtil::ValidateTableIndexNlist(0).code(), ms::SERVER_INVALID_INDEX_NLIST);
+    ASSERT_EQ(ms::server::ValidationUtil::ValidateTableIndexNlist(100).code(), ms::SERVER_SUCCESS);
 
-    ASSERT_EQ(server::ValidationUtil::ValidateTableIndexFileSize(0).code(), SERVER_INVALID_INDEX_FILE_SIZE);
-    ASSERT_EQ(server::ValidationUtil::ValidateTableIndexFileSize(100).code(), SERVER_SUCCESS);
+    ASSERT_EQ(ms::server::ValidationUtil::ValidateTableIndexFileSize(0).code(), ms::SERVER_INVALID_INDEX_FILE_SIZE);
+    ASSERT_EQ(ms::server::ValidationUtil::ValidateTableIndexFileSize(100).code(), ms::SERVER_SUCCESS);
 
-    ASSERT_EQ(server::ValidationUtil::ValidateTableIndexMetricType(0).code(), SERVER_INVALID_INDEX_METRIC_TYPE);
-    ASSERT_EQ(server::ValidationUtil::ValidateTableIndexMetricType(1).code(), SERVER_SUCCESS);
-    ASSERT_EQ(server::ValidationUtil::ValidateTableIndexMetricType(2).code(), SERVER_SUCCESS);
+    ASSERT_EQ(ms::server::ValidationUtil::ValidateTableIndexMetricType(0).code(), ms::SERVER_INVALID_INDEX_METRIC_TYPE);
+    ASSERT_EQ(ms::server::ValidationUtil::ValidateTableIndexMetricType(1).code(), ms::SERVER_SUCCESS);
+    ASSERT_EQ(ms::server::ValidationUtil::ValidateTableIndexMetricType(2).code(), ms::SERVER_SUCCESS);
 }
 
 TEST(ValidationUtilTest, VALIDATE_TOPK_TEST) {
-    engine::meta::TableSchema schema;
-    ASSERT_EQ(server::ValidationUtil::ValidateSearchTopk(10, schema).code(), SERVER_SUCCESS);
-    ASSERT_NE(server::ValidationUtil::ValidateSearchTopk(65536, schema).code(), SERVER_SUCCESS);
-    ASSERT_NE(server::ValidationUtil::ValidateSearchTopk(0, schema).code(), SERVER_SUCCESS);
+    ms::engine::meta::TableSchema schema;
+    ASSERT_EQ(ms::server::ValidationUtil::ValidateSearchTopk(10, schema).code(), ms::SERVER_SUCCESS);
+    ASSERT_NE(ms::server::ValidationUtil::ValidateSearchTopk(65536, schema).code(), ms::SERVER_SUCCESS);
+    ASSERT_NE(ms::server::ValidationUtil::ValidateSearchTopk(0, schema).code(), ms::SERVER_SUCCESS);
 }
 
 TEST(ValidationUtilTest, VALIDATE_NPROBE_TEST) {
-    engine::meta::TableSchema schema;
+    ms::engine::meta::TableSchema schema;
     schema.nlist_ = 100;
-    ASSERT_EQ(server::ValidationUtil::ValidateSearchNprobe(10, schema).code(), SERVER_SUCCESS);
-    ASSERT_NE(server::ValidationUtil::ValidateSearchNprobe(0, schema).code(), SERVER_SUCCESS);
-    ASSERT_NE(server::ValidationUtil::ValidateSearchNprobe(101, schema).code(), SERVER_SUCCESS);
+    ASSERT_EQ(ms::server::ValidationUtil::ValidateSearchNprobe(10, schema).code(), ms::SERVER_SUCCESS);
+    ASSERT_NE(ms::server::ValidationUtil::ValidateSearchNprobe(0, schema).code(), ms::SERVER_SUCCESS);
+    ASSERT_NE(ms::server::ValidationUtil::ValidateSearchNprobe(101, schema).code(), ms::SERVER_SUCCESS);
 }
 
 TEST(ValidationUtilTest, VALIDATE_GPU_TEST) {
-    ASSERT_EQ(server::ValidationUtil::ValidateGpuIndex(0).code(), SERVER_SUCCESS);
-    ASSERT_NE(server::ValidationUtil::ValidateGpuIndex(100).code(), SERVER_SUCCESS);
+    ASSERT_EQ(ms::server::ValidationUtil::ValidateGpuIndex(0).code(), ms::SERVER_SUCCESS);
+    ASSERT_NE(ms::server::ValidationUtil::ValidateGpuIndex(100).code(), ms::SERVER_SUCCESS);
 
     size_t memory = 0;
-    ASSERT_EQ(server::ValidationUtil::GetGpuMemory(0, memory).code(), SERVER_SUCCESS);
-    ASSERT_NE(server::ValidationUtil::GetGpuMemory(100, memory).code(), SERVER_SUCCESS);
+    ASSERT_EQ(ms::server::ValidationUtil::GetGpuMemory(0, memory).code(), ms::SERVER_SUCCESS);
+    ASSERT_NE(ms::server::ValidationUtil::GetGpuMemory(100, memory).code(), ms::SERVER_SUCCESS);
 }
 
 TEST(ValidationUtilTest, VALIDATE_IPADDRESS_TEST) {
-    ASSERT_EQ(server::ValidationUtil::ValidateIpAddress("127.0.0.1").code(), SERVER_SUCCESS);
-    ASSERT_NE(server::ValidationUtil::ValidateIpAddress("not ip").code(), SERVER_SUCCESS);
+    ASSERT_EQ(ms::server::ValidationUtil::ValidateIpAddress("127.0.0.1").code(), ms::SERVER_SUCCESS);
+    ASSERT_NE(ms::server::ValidationUtil::ValidateIpAddress("not ip").code(), ms::SERVER_SUCCESS);
 }
 
 TEST(ValidationUtilTest, VALIDATE_NUMBER_TEST) {
-    ASSERT_EQ(server::ValidationUtil::ValidateStringIsNumber("1234").code(), SERVER_SUCCESS);
-    ASSERT_NE(server::ValidationUtil::ValidateStringIsNumber("not number").code(), SERVER_SUCCESS);
+    ASSERT_EQ(ms::server::ValidationUtil::ValidateStringIsNumber("1234").code(), ms::SERVER_SUCCESS);
+    ASSERT_NE(ms::server::ValidationUtil::ValidateStringIsNumber("not number").code(), ms::SERVER_SUCCESS);
 }
 
 TEST(ValidationUtilTest, VALIDATE_BOOL_TEST) {
     std::string str = "true";
-    ASSERT_EQ(server::ValidationUtil::ValidateStringIsBool(str).code(), SERVER_SUCCESS);
+    ASSERT_EQ(ms::server::ValidationUtil::ValidateStringIsBool(str).code(), ms::SERVER_SUCCESS);
     str = "not bool";
-    ASSERT_NE(server::ValidationUtil::ValidateStringIsBool(str).code(), SERVER_SUCCESS);
+    ASSERT_NE(ms::server::ValidationUtil::ValidateStringIsBool(str).code(), ms::SERVER_SUCCESS);
 }
 
 TEST(ValidationUtilTest, VALIDATE_DOUBLE_TEST) {
-    ASSERT_EQ(server::ValidationUtil::ValidateStringIsFloat("2.5").code(), SERVER_SUCCESS);
-    ASSERT_NE(server::ValidationUtil::ValidateStringIsFloat("not double").code(), SERVER_SUCCESS);
+    ASSERT_EQ(ms::server::ValidationUtil::ValidateStringIsFloat("2.5").code(), ms::SERVER_SUCCESS);
+    ASSERT_NE(ms::server::ValidationUtil::ValidateStringIsFloat("not double").code(), ms::SERVER_SUCCESS);
 }
 
 TEST(ValidationUtilTest, VALIDATE_DBURI_TEST) {
-    ASSERT_EQ(server::ValidationUtil::ValidateDbURI("sqlite://:@:/").code(), SERVER_SUCCESS);
-    ASSERT_NE(server::ValidationUtil::ValidateDbURI("xxx://:@:/").code(), SERVER_SUCCESS);
-    ASSERT_NE(server::ValidationUtil::ValidateDbURI("not uri").code(), SERVER_SUCCESS);
-    ASSERT_EQ(server::ValidationUtil::ValidateDbURI("mysql://root:123456@127.0.0.1:3303/milvus").code(), SERVER_SUCCESS);
-    ASSERT_NE(server::ValidationUtil::ValidateDbURI("mysql://root:123456@127.0.0.1:port/milvus").code(), SERVER_SUCCESS);
+    ASSERT_EQ(ms::server::ValidationUtil::ValidateDbURI("sqlite://:@:/").code(), ms::SERVER_SUCCESS);
+    ASSERT_NE(ms::server::ValidationUtil::ValidateDbURI("xxx://:@:/").code(), ms::SERVER_SUCCESS);
+    ASSERT_NE(ms::server::ValidationUtil::ValidateDbURI("not uri").code(), ms::SERVER_SUCCESS);
+    ASSERT_EQ(ms::server::ValidationUtil::ValidateDbURI("mysql://root:123456@127.0.0.1:3303/milvus").code(),
+              ms::SERVER_SUCCESS);
+    ASSERT_NE(ms::server::ValidationUtil::ValidateDbURI("mysql://root:123456@127.0.0.1:port/milvus").code(),
+              ms::SERVER_SUCCESS);
 }
 
-TEST(UtilTest, ROLLOUTHANDLER_TEST){
+TEST(UtilTest, ROLLOUTHANDLER_TEST) {
     std::string dir1 = "/tmp/milvus_test";
     std::string dir2 = "/tmp/milvus_test/log_test";
-    std::string filename[6] = {"log_global.log", "log_debug.log", "log_warning.log", "log_trace.log", "log_error.log", "log_fatal.log"};
-    el::Level list[6] = {el::Level::Global, el::Level::Debug, el::Level::Warning, el::Level::Trace, el::Level::Error, el::Level::Fatal};
+    std::string filename[6] = {
+        "log_global.log",
+        "log_debug.log",
+        "log_warning.log",
+        "log_trace.log",
+        "log_error.log",
+        "log_fatal.log"};
+
+    el::Level list[6] = {
+        el::Level::Global,
+        el::Level::Debug,
+        el::Level::Warning,
+        el::Level::Trace,
+        el::Level::Error,
+        el::Level::Fatal};
 
     mkdir(dir1.c_str(), S_IRWXU);
     mkdir(dir2.c_str(), S_IRWXU);
@@ -358,7 +374,7 @@ TEST(UtilTest, ROLLOUTHANDLER_TEST){
         file.open(tmp.c_str());
         file << "zilliz" << std::endl;
 
-        server::RolloutHandler(tmp.c_str(), 0, list[i]);
+        ms::server::RolloutHandler(tmp.c_str(), 0, list[i]);
 
         tmp.append(".1");
         std::ifstream file2;
@@ -369,4 +385,4 @@ TEST(UtilTest, ROLLOUTHANDLER_TEST){
         ASSERT_EQ(tmp2, "zilliz");
     }
     boost::filesystem::remove_all(dir2);
-}
\ No newline at end of file
+}
diff --git a/cpp/unittest/wrapper/utils.cpp b/cpp/unittest/wrapper/utils.cpp
index f404f000e9..f9fe8a50fc 100644
--- a/cpp/unittest/wrapper/utils.cpp
+++ b/cpp/unittest/wrapper/utils.cpp
@@ -20,10 +20,10 @@
 
 #include "utils.h"
 
-
-void DataGenBase::GenData(const int &dim, const int &nb, const int &nq,
-                          float *xb, float *xq, long *ids,
-                          const int &k, long *gt_ids, float *gt_dis) {
+void
+DataGenBase::GenData(const int &dim, const int &nb, const int &nq,
+                     float *xb, float *xq, long *ids,
+                     const int &k, long *gt_ids, float *gt_dis) {
     for (auto i = 0; i < nb; ++i) {
         for (auto j = 0; j < dim; ++j) {
             //p_data[i * d + j] = float(base + i);
@@ -42,15 +42,16 @@ void DataGenBase::GenData(const int &dim, const int &nb, const int &nq,
     index.search(nq, xq, k, gt_dis, gt_ids);
 }
 
-void DataGenBase::GenData(const int &dim,
-                          const int &nb,
-                          const int &nq,
-                          std::vector<float> &xb,
-                          std::vector<float> &xq,
-                          std::vector<long> &ids,
-                          const int &k,
-                          std::vector<long> &gt_ids,
-                          std::vector<float> &gt_dis) {
+void
+DataGenBase::GenData(const int &dim,
+                     const int &nb,
+                     const int &nq,
+                     std::vector<float> &xb,
+                     std::vector<float> &xq,
+                     std::vector<long> &ids,
+                     const int &k,
+                     std::vector<long> &gt_ids,
+                     std::vector<float> &gt_dis) {
     xb.resize(nb * dim);
     xq.resize(nq * dim);
     ids.resize(nb);
diff --git a/cpp/unittest/wrapper/utils.h b/cpp/unittest/wrapper/utils.h
index 7a73d84713..431aa30306 100644
--- a/cpp/unittest/wrapper/utils.h
+++ b/cpp/unittest/wrapper/utils.h
@@ -24,12 +24,10 @@
 #include <cstdio>
 #include <fstream>
 
-
 class DataGenBase;
 
 using DataGenPtr = std::shared_ptr<DataGenBase>;
 
-
 class DataGenBase {
  public:
     virtual void GenData(const int &dim, const int &nb, const int &nq, float *xb, float *xq, long *ids,
diff --git a/cpp/unittest/wrapper/wrapper_test.cpp b/cpp/unittest/wrapper/wrapper_test.cpp
index 4c50201fb3..19b84d315f 100644
--- a/cpp/unittest/wrapper/wrapper_test.cpp
+++ b/cpp/unittest/wrapper/wrapper_test.cpp
@@ -18,7 +18,7 @@
 #include "utils/easylogging++.h"
 #include "src/wrapper/VecIndex.h"
 #include "knowhere/index/vector_index/helpers/FaissGpuResourceMgr.h"
-#include "utils.h"
+#include "wrapper/utils.h"
 
 #include <gtest/gtest.h>
 
diff --git a/cpp/version.h.macro b/cpp/version.h.macro
index 2463407a0d..454d8a990a 100644
--- a/cpp/version.h.macro
+++ b/cpp/version.h.macro
@@ -1,3 +1,20 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
 #pragma once
 
 #define MILVUS_VERSION "@MILVUS_VERSION@"