diff --git a/cpp/src/scheduler/optimizer/HybridPass.cpp b/cpp/src/scheduler/optimizer/HybridPass.cpp
index 1b0ab7c4d0..f172a7beb9 100644
--- a/cpp/src/scheduler/optimizer/HybridPass.cpp
+++ b/cpp/src/scheduler/optimizer/HybridPass.cpp
@@ -15,7 +15,7 @@
 // specific language governing permissions and limitations
 // under the License.
 
-#include "HybridPass.h"
+#include "scheduler/optimizer/HybridPass.h"
 #include "scheduler/task/SearchTask.h"
 
 namespace milvus {
@@ -24,12 +24,12 @@ namespace scheduler {
 bool
 HybridPass::Run(const TaskPtr& task) {
     // TODO: Index::IVFSQ8Hybrid, if nq < threshold set cpu, else set gpu
-    if (task->Type() != TaskType::SearchTask) return false;
+    if (task->Type() != TaskType::SearchTask)
+        return false;
     auto search_task = std::static_pointer_cast<XSearchTask>(task);
     // if (search_task->file_->engine_type_ == engine::EngineType::FAISS_IVFSQ8Hybrid)
     return false;
 }
 
-}
-}
-
+}  // namespace scheduler
+}  // namespace milvus
diff --git a/cpp/src/scheduler/optimizer/HybridPass.h b/cpp/src/scheduler/optimizer/HybridPass.h
index e043bf8ad5..0d02a8bda9 100644
--- a/cpp/src/scheduler/optimizer/HybridPass.h
+++ b/cpp/src/scheduler/optimizer/HybridPass.h
@@ -16,16 +16,16 @@
 // under the License.
 #pragma once
 
-#include <string>
-#include <vector>
-#include <list>
-#include <queue>
-#include <deque>
-#include <unordered_map>
-#include <thread>
-#include <mutex>
 #include <condition_variable>
+#include <deque>
+#include <list>
 #include <memory>
+#include <mutex>
+#include <queue>
+#include <string>
+#include <thread>
+#include <unordered_map>
+#include <vector>
 
 #include "Pass.h"
 
@@ -43,6 +43,5 @@ class HybridPass : public Pass {
 
 using HybridPassPtr = std::shared_ptr<HybridPass>;
 
-}
-}
-
+}  // namespace scheduler
+}  // namespace milvus
diff --git a/cpp/src/scheduler/optimizer/Optimizer.cpp b/cpp/src/scheduler/optimizer/Optimizer.cpp
index 517cd85f79..c5fa311a27 100644
--- a/cpp/src/scheduler/optimizer/Optimizer.cpp
+++ b/cpp/src/scheduler/optimizer/Optimizer.cpp
@@ -15,7 +15,7 @@
 // specific language governing permissions and limitations
 // under the License.
 
-#include "Optimizer.h"
+#include "scheduler/optimizer/Optimizer.h"
 
 namespace milvus {
 namespace scheduler {
@@ -38,6 +38,5 @@ Optimizer::Run(const TaskPtr& task) {
     return false;
 }
 
-}
-}
-
+}  // namespace scheduler
+}  // namespace milvus
diff --git a/cpp/src/scheduler/optimizer/Optimizer.h b/cpp/src/scheduler/optimizer/Optimizer.h
index cbb13a8fc2..99282e66a6 100644
--- a/cpp/src/scheduler/optimizer/Optimizer.h
+++ b/cpp/src/scheduler/optimizer/Optimizer.h
@@ -16,16 +16,16 @@
 // under the License.
 #pragma once
 
-#include <string>
-#include <vector>
-#include <list>
-#include <queue>
-#include <deque>
-#include <unordered_map>
-#include <thread>
-#include <mutex>
 #include <condition_variable>
+#include <deque>
+#include <list>
 #include <memory>
+#include <mutex>
+#include <queue>
+#include <string>
+#include <thread>
+#include <unordered_map>
+#include <vector>
 
 #include "Pass.h"
 
@@ -40,12 +40,11 @@ class Optimizer {
     Init();
 
     bool
-    Run(const TaskPtr &task);
+    Run(const TaskPtr& task);
 
  private:
     std::vector<PassPtr> pass_list_;
 };
 
-}
-}
-
+}  // namespace scheduler
+}  // namespace milvus
diff --git a/cpp/src/scheduler/optimizer/Pass.h b/cpp/src/scheduler/optimizer/Pass.h
index 1c8def41a2..959c3ea5ee 100644
--- a/cpp/src/scheduler/optimizer/Pass.h
+++ b/cpp/src/scheduler/optimizer/Pass.h
@@ -16,16 +16,16 @@
 // under the License.
 #pragma once
 
-#include <string>
-#include <vector>
-#include <list>
-#include <queue>
-#include <deque>
-#include <unordered_map>
-#include <thread>
-#include <mutex>
 #include <condition_variable>
+#include <deque>
+#include <list>
 #include <memory>
+#include <mutex>
+#include <queue>
+#include <string>
+#include <thread>
+#include <unordered_map>
+#include <vector>
 
 #include "scheduler/task/Task.h"
 
@@ -35,12 +35,13 @@ namespace scheduler {
 class Pass {
  public:
     virtual void
-    Init() {}
+    Init() {
+    }
 
     virtual bool
     Run(const TaskPtr& task) = 0;
 };
 using PassPtr = std::shared_ptr<Pass>;
 
-}
-}
+}  // namespace scheduler
+}  // namespace milvus
diff --git a/cpp/src/server/Config.cpp b/cpp/src/server/Config.cpp
index 3a88c7f8ba..d383eb5edd 100644
--- a/cpp/src/server/Config.cpp
+++ b/cpp/src/server/Config.cpp
@@ -735,8 +735,7 @@ Config::GetDBConfigArchiveDaysThreshold(int32_t& value) {
 
 Status
 Config::GetDBConfigInsertBufferSize(int32_t& value) {
-    std::string str =
-        GetConfigStr(CONFIG_DB, CONFIG_DB_INSERT_BUFFER_SIZE, CONFIG_DB_INSERT_BUFFER_SIZE_DEFAULT);
+    std::string str = GetConfigStr(CONFIG_DB, CONFIG_DB_INSERT_BUFFER_SIZE, CONFIG_DB_INSERT_BUFFER_SIZE_DEFAULT);
     Status s = CheckDBConfigInsertBufferSize(str);
     if (!s.ok()) {
         return s;
@@ -748,8 +747,7 @@ Config::GetDBConfigInsertBufferSize(int32_t& value) {
 
 Status
 Config::GetDBConfigBuildIndexGPU(int32_t& value) {
-    std::string str =
-        GetConfigStr(CONFIG_DB, CONFIG_DB_BUILD_INDEX_GPU, CONFIG_DB_BUILD_INDEX_GPU_DEFAULT);
+    std::string str = GetConfigStr(CONFIG_DB, CONFIG_DB_BUILD_INDEX_GPU, CONFIG_DB_BUILD_INDEX_GPU_DEFAULT);
     Status s = CheckDBConfigBuildIndexGPU(str);
     if (!s.ok()) {
         return s;
@@ -767,8 +765,7 @@ Config::GetDBConfigPreloadTable(std::string& value) {
 
 Status
 Config::GetMetricConfigEnableMonitor(bool& value) {
-    std::string str =
-        GetConfigStr(CONFIG_METRIC, CONFIG_METRIC_ENABLE_MONITOR, CONFIG_METRIC_ENABLE_MONITOR_DEFAULT);
+    std::string str = GetConfigStr(CONFIG_METRIC, CONFIG_METRIC_ENABLE_MONITOR, CONFIG_METRIC_ENABLE_MONITOR_DEFAULT);
     Status s = CheckMetricConfigEnableMonitor(str);
     if (!s.ok()) {
         return s;
@@ -872,8 +869,7 @@ Config::GetEngineConfigUseBlasThreshold(int32_t& value) {
 
 Status
 Config::GetEngineConfigOmpThreadNum(int32_t& value) {
-    std::string str =
-        GetConfigStr(CONFIG_ENGINE, CONFIG_ENGINE_OMP_THREAD_NUM, CONFIG_ENGINE_OMP_THREAD_NUM_DEFAULT);
+    std::string str = GetConfigStr(CONFIG_ENGINE, CONFIG_ENGINE_OMP_THREAD_NUM, CONFIG_ENGINE_OMP_THREAD_NUM_DEFAULT);
     Status s = CheckEngineConfigOmpThreadNum(str);
     if (!s.ok()) {
         return s;
diff --git a/cpp/src/server/DBWrapper.cpp b/cpp/src/server/DBWrapper.cpp
index 99bf57b3e0..306863f8ae 100644
--- a/cpp/src/server/DBWrapper.cpp
+++ b/cpp/src/server/DBWrapper.cpp
@@ -25,6 +25,7 @@
 #include <faiss/utils.h>
 #include <omp.h>
 #include <string>
+#include <vector>
 
 namespace milvus {
 namespace server {
@@ -183,14 +184,14 @@ DBWrapper::StopService() {
 
 Status
 DBWrapper::PreloadTables(const std::string& preload_tables) {
-    if(preload_tables.empty()) {
-        //do nothing
-    } else if(preload_tables == "*") {
-        //load all tables
+    if (preload_tables.empty()) {
+        // do nothing
+    } else if (preload_tables == "*") {
+        // load all tables
         std::vector<engine::meta::TableSchema> table_schema_array;
         db_->AllTables(table_schema_array);
 
-        for(auto& schema : table_schema_array) {
+        for (auto& schema : table_schema_array) {
             auto status = db_->PreloadTable(schema.table_id_);
             if (!status.ok()) {
                 return status;
@@ -199,7 +200,7 @@ DBWrapper::PreloadTables(const std::string& preload_tables) {
     } else {
         std::vector<std::string> table_names;
         StringHelpFunctions::SplitStringByDelimeter(preload_tables, ",", table_names);
-        for(auto& name : table_names) {
+        for (auto& name : table_names) {
             auto status = db_->PreloadTable(name);
             if (!status.ok()) {
                 return status;
diff --git a/cpp/src/server/DBWrapper.h b/cpp/src/server/DBWrapper.h
index 3508efa63d..7016aa8805 100644
--- a/cpp/src/server/DBWrapper.h
+++ b/cpp/src/server/DBWrapper.h
@@ -21,6 +21,7 @@
 #include "utils/Status.h"
 
 #include <memory>
+#include <string>
 
 namespace milvus {
 namespace server {