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Refactor reduce strategy in query node 

Signed-off-by: xige-16 <xi.ge@zilliz.com>
pull/4973/head^2
xige-16 2020-12-31 14:49:27 +08:00 committed by yefu.chen
parent 4808b46246
commit 29b21b4bf2
6 changed files with 461 additions and 59 deletions
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4
internal/core/src/segcore/segment_c.cpp
View File

@ -181,15 +181,15 @@ FillTargetEntry(CSegmentBase c_segment, CPlan c_plan, CQueryResult c_result) {
CStatus
UpdateSegmentIndex(CSegmentBase c_segment, CLoadIndexInfo c_load_index_info) {
auto status = CStatus();
try {
auto segment = (milvus::segcore::SegmentBase*)c_segment;
auto load_index_info = (LoadIndexInfo*)c_load_index_info;
auto status = CStatus();
auto res = segment->LoadIndexing(*load_index_info);
status.error_code = Success;
status.error_msg = "";
return status;
} catch (std::exception& e) {
auto status = CStatus();
status.error_code = UnexpectedException;
status.error_msg = strdup(e.what());
return status;

461
internal/core/unittest/test_c_api.cpp
View File

@ -14,6 +14,7 @@
#include <random>
#include <gtest/gtest.h>
#include <chrono>
#include <google/protobuf/text_format.h>
#include "pb/service_msg.pb.h"
#include "segcore/reduce_c.h"
@ -23,9 +24,17 @@
#include <index/knowhere/knowhere/index/vector_index/VecIndexFactory.h>
#include <index/knowhere/knowhere/index/vector_index/IndexIVFPQ.h>
#include <common/LoadIndex.h>
#include <utils/Types.h>
#include <segcore/Collection.h>
#include "test_utils/DataGen.h"
namespace chrono = std::chrono;
using namespace milvus;
using namespace milvus::segcore;
using namespace milvus::proto;
using namespace milvus::knowhere;
TEST(CApiTest, CollectionTest) {
auto schema_tmp_conf = "";
auto collection = NewCollection(schema_tmp_conf);
@ -344,11 +353,11 @@ TEST(CApiTest, GetMemoryUsageInBytesTest) {
namespace {
auto
generate_data(int N) {
std::vector<float> raw_data;
std::vector<char> raw_data;
std::vector<uint64_t> timestamps;
std::vector<int64_t> uids;
std::default_random_engine er(42);
std::uniform_real_distribution<> distribution(0.0, 1.0);
std::normal_distribution<> distribution(0.0, 1.0);
std::default_random_engine ei(42);
for (int i = 0; i < N; ++i) {
uids.push_back(10 * N + i);
@ -358,12 +367,58 @@ generate_data(int N) {
for (auto& x : vec) {
x = distribution(er);
}
raw_data.insert(raw_data.end(), std::begin(vec), std::end(vec));
raw_data.insert(raw_data.end(), (const char*)std::begin(vec), (const char*)std::end(vec));
int age = ei() % 100;
raw_data.insert(raw_data.end(), (const char*)&age, ((const char*)&age) + sizeof(age));
}
return std::make_tuple(raw_data, timestamps, uids);
}
std::string
generate_collection_shema(std::string metric_type, std::string dim) {
schema::CollectionSchema collection_schema;
collection_schema.set_name("collection_test");
collection_schema.set_autoid(true);
auto vec_field_schema = collection_schema.add_fields();
vec_field_schema->set_name("fakevec");
vec_field_schema->set_fieldid(0);
vec_field_schema->set_data_type(schema::DataType::VECTOR_FLOAT);
auto metric_type_param = vec_field_schema->add_index_params();
metric_type_param->set_key("metric_type");
metric_type_param->set_value(metric_type);
auto dim_param = vec_field_schema->add_type_params();
dim_param->set_key("dim");
dim_param->set_value(dim);
auto other_field_schema = collection_schema.add_fields();
;
other_field_schema->set_name("counter");
other_field_schema->set_fieldid(1);
other_field_schema->set_data_type(schema::DataType::INT64);
std::string schema_string;
auto marshal = google::protobuf::TextFormat::PrintToString(collection_schema, &schema_string);
assert(marshal == true);
return schema_string;
}
VecIndexPtr
generate_index(
void* raw_data, milvus::knowhere::Config conf, int64_t dim, int64_t topK, int64_t N, std::string index_type) {
auto indexing = knowhere::VecIndexFactory::GetInstance().CreateVecIndex(index_type, knowhere::IndexMode::MODE_CPU);
auto database = milvus::knowhere::GenDataset(N, dim, raw_data);
indexing->Train(database, conf);
indexing->AddWithoutIds(database, conf);
EXPECT_EQ(indexing->Count(), N);
EXPECT_EQ(indexing->Dim(), dim);
EXPECT_EQ(indexing->Count(), N);
EXPECT_EQ(indexing->Dim(), dim);
return indexing;
}
} // namespace
// TEST(CApiTest, TestSearchPreference) {
@ -776,4 +831,404 @@ TEST(CApiTest, LoadIndex_Search) {
for (int i = 0; i < std::min(num_query * K, 100); ++i) {
std::cout << ids[i] << "->" << dis[i] << std::endl;
}
}
TEST(CApiTest, UpdateSegmentIndex_Without_Predicate) {
// insert data to segment
constexpr auto DIM = 16;
constexpr auto K = 5;
std::string schema_string = generate_collection_shema("L2", "16");
auto collection = NewCollection(schema_string.c_str());
auto schema = ((segcore::Collection*)collection)->get_schema();
auto segment = NewSegment(collection, 0);
auto N = 1000 * 1000;
auto dataset = DataGen(schema, N);
auto vec_col = dataset.get_col<float>(0);
auto query_ptr = vec_col.data() + 420000 * DIM;
PreInsert(segment, N);
auto ins_res = Insert(segment, 0, N, dataset.row_ids_.data(), dataset.timestamps_.data(), dataset.raw_.raw_data,
dataset.raw_.sizeof_per_row, dataset.raw_.count);
assert(ins_res.error_code == Success);
const char* dsl_string = R"(
{
"bool": {
"vector": {
"fakevec": {
"metric_type": "L2",
"params": {
"nprobe": 10
},
"query": "$0",
"topk": 5
}
}
}
})";
// create place_holder_group
int num_queries = 5;
auto raw_group = CreatePlaceholderGroupFromBlob(num_queries, 16, query_ptr);
auto blob = raw_group.SerializeAsString();
// search on segment's small index
void* plan = nullptr;
auto status = CreatePlan(collection, dsl_string, &plan);
assert(status.error_code == Success);
void* placeholderGroup = nullptr;
status = ParsePlaceholderGroup(plan, blob.data(), blob.length(), &placeholderGroup);
assert(status.error_code == Success);
std::vector<CPlaceholderGroup> placeholderGroups;
placeholderGroups.push_back(placeholderGroup);
Timestamp time = 10000000;
CQueryResult c_search_result_on_smallIndex;
auto res_before_load_index =
Search(segment, plan, placeholderGroups.data(), &time, 1, &c_search_result_on_smallIndex);
assert(res_before_load_index.error_code == Success);
// load index to segment
auto conf = milvus::knowhere::Config{{milvus::knowhere::meta::DIM, DIM},
{milvus::knowhere::meta::TOPK, K},
{milvus::knowhere::IndexParams::nlist, 100},
{milvus::knowhere::IndexParams::nprobe, 10},
{milvus::knowhere::IndexParams::m, 4},
{milvus::knowhere::IndexParams::nbits, 8},
{milvus::knowhere::Metric::TYPE, milvus::knowhere::Metric::L2},
{milvus::knowhere::meta::DEVICEID, 0}};
auto indexing = generate_index(vec_col.data(), conf, DIM, K, N, IndexEnum::INDEX_FAISS_IVFPQ);
// gen query dataset
auto query_dataset = milvus::knowhere::GenDataset(num_queries, DIM, query_ptr);
auto result_on_index = indexing->Query(query_dataset, conf, nullptr);
auto ids = result_on_index->Get<int64_t*>(milvus::knowhere::meta::IDS);
auto dis = result_on_index->Get<float*>(milvus::knowhere::meta::DISTANCE);
std::vector<int64_t> vec_ids(ids, ids + K * num_queries);
std::vector<float> vec_dis;
for (int j = 0; j < K * num_queries; ++j) {
vec_dis.push_back(dis[j] * -1);
}
auto search_result_on_raw_index = (QueryResult*)c_search_result_on_smallIndex;
search_result_on_raw_index->internal_seg_offsets_ = vec_ids;
search_result_on_raw_index->result_distances_ = vec_dis;
auto binary_set = indexing->Serialize(conf);
void* c_load_index_info = nullptr;
status = NewLoadIndexInfo(&c_load_index_info);
assert(status.error_code == Success);
std::string index_type_key = "index_type";
std::string index_type_value = "IVF_PQ";
std::string index_mode_key = "index_mode";
std::string index_mode_value = "cpu";
std::string metric_type_key = "metric_type";
std::string metric_type_value = "L2";
AppendIndexParam(c_load_index_info, index_type_key.c_str(), index_type_value.c_str());
AppendIndexParam(c_load_index_info, index_mode_key.c_str(), index_mode_value.c_str());
AppendIndexParam(c_load_index_info, metric_type_key.c_str(), metric_type_value.c_str());
AppendFieldInfo(c_load_index_info, "fakevec", 0);
AppendIndex(c_load_index_info, (CBinarySet)&binary_set);
status = UpdateSegmentIndex(segment, c_load_index_info);
assert(status.error_code == Success);
CQueryResult c_search_result_on_bigIndex;
auto res_after_load_index = Search(segment, plan, placeholderGroups.data(), &time, 1, &c_search_result_on_bigIndex);
assert(res_after_load_index.error_code == Success);
auto search_result_on_raw_index_json = QueryResultToJson(*search_result_on_raw_index);
auto search_result_on_bigIndex_json = QueryResultToJson((*(QueryResult*)c_search_result_on_bigIndex));
std::cout << search_result_on_raw_index_json.dump(1) << std::endl;
std::cout << search_result_on_bigIndex_json.dump(1) << std::endl;
ASSERT_EQ(search_result_on_raw_index_json.dump(1), search_result_on_bigIndex_json.dump(1));
DeleteLoadIndexInfo(c_load_index_info);
DeletePlan(plan);
DeletePlaceholderGroup(placeholderGroup);
DeleteQueryResult(c_search_result_on_smallIndex);
DeleteQueryResult(c_search_result_on_bigIndex);
DeleteCollection(collection);
DeleteSegment(segment);
}
TEST(CApiTest, UpdateSegmentIndex_With_Predicate_Range) {
// insert data to segment
constexpr auto DIM = 16;
constexpr auto K = 5;
std::string schema_string = generate_collection_shema("L2", "16");
auto collection = NewCollection(schema_string.c_str());
auto schema = ((segcore::Collection*)collection)->get_schema();
auto segment = NewSegment(collection, 0);
auto N = 1000 * 1000;
auto dataset = DataGen(schema, N);
auto vec_col = dataset.get_col<float>(0);
auto query_ptr = vec_col.data() + 420000 * DIM;
PreInsert(segment, N);
auto ins_res = Insert(segment, 0, N, dataset.row_ids_.data(), dataset.timestamps_.data(), dataset.raw_.raw_data,
dataset.raw_.sizeof_per_row, dataset.raw_.count);
assert(ins_res.error_code == Success);
const char* dsl_string = R"({
"bool": {
"must": [
{
"range": {
"counter": {
"GE": 420000,
"LT": 420010
}
}
},
{
"vector": {
"fakevec": {
"metric_type": "L2",
"params": {
"nprobe": 10
},
"query": "$0",
"topk": 5
}
}
}
]
}
})";
// create place_holder_group
int num_queries = 10;
auto raw_group = CreatePlaceholderGroupFromBlob(num_queries, DIM, query_ptr);
auto blob = raw_group.SerializeAsString();
// search on segment's small index
void* plan = nullptr;
auto status = CreatePlan(collection, dsl_string, &plan);
assert(status.error_code == Success);
void* placeholderGroup = nullptr;
status = ParsePlaceholderGroup(plan, blob.data(), blob.length(), &placeholderGroup);
assert(status.error_code == Success);
std::vector<CPlaceholderGroup> placeholderGroups;
placeholderGroups.push_back(placeholderGroup);
Timestamp time = 10000000;
CQueryResult c_search_result_on_smallIndex;
auto res_before_load_index =
Search(segment, plan, placeholderGroups.data(), &time, 1, &c_search_result_on_smallIndex);
assert(res_before_load_index.error_code == Success);
// load index to segment
auto conf = milvus::knowhere::Config{{milvus::knowhere::meta::DIM, DIM},
{milvus::knowhere::meta::TOPK, K},
{milvus::knowhere::IndexParams::nlist, 100},
{milvus::knowhere::IndexParams::nprobe, 10},
{milvus::knowhere::IndexParams::m, 4},
{milvus::knowhere::IndexParams::nbits, 8},
{milvus::knowhere::Metric::TYPE, milvus::knowhere::Metric::L2},
{milvus::knowhere::meta::DEVICEID, 0}};
auto indexing = generate_index(vec_col.data(), conf, DIM, K, N, IndexEnum::INDEX_FAISS_IVFPQ);
// gen query dataset
auto query_dataset = milvus::knowhere::GenDataset(num_queries, DIM, query_ptr);
auto result_on_index = indexing->Query(query_dataset, conf, nullptr);
auto ids = result_on_index->Get<int64_t*>(milvus::knowhere::meta::IDS);
auto dis = result_on_index->Get<float*>(milvus::knowhere::meta::DISTANCE);
std::vector<int64_t> vec_ids(ids, ids + K * num_queries);
std::vector<float> vec_dis;
for (int j = 0; j < K * num_queries; ++j) {
vec_dis.push_back(dis[j] * -1);
}
auto search_result_on_raw_index = (QueryResult*)c_search_result_on_smallIndex;
search_result_on_raw_index->internal_seg_offsets_ = vec_ids;
search_result_on_raw_index->result_distances_ = vec_dis;
auto binary_set = indexing->Serialize(conf);
void* c_load_index_info = nullptr;
status = NewLoadIndexInfo(&c_load_index_info);
assert(status.error_code == Success);
std::string index_type_key = "index_type";
std::string index_type_value = "IVF_PQ";
std::string index_mode_key = "index_mode";
std::string index_mode_value = "cpu";
std::string metric_type_key = "metric_type";
std::string metric_type_value = "L2";
AppendIndexParam(c_load_index_info, index_type_key.c_str(), index_type_value.c_str());
AppendIndexParam(c_load_index_info, index_mode_key.c_str(), index_mode_value.c_str());
AppendIndexParam(c_load_index_info, metric_type_key.c_str(), metric_type_value.c_str());
AppendFieldInfo(c_load_index_info, "fakevec", 0);
AppendIndex(c_load_index_info, (CBinarySet)&binary_set);
status = UpdateSegmentIndex(segment, c_load_index_info);
assert(status.error_code == Success);
CQueryResult c_search_result_on_bigIndex;
auto res_after_load_index = Search(segment, plan, placeholderGroups.data(), &time, 1, &c_search_result_on_bigIndex);
assert(res_after_load_index.error_code == Success);
auto search_result_on_bigIndex = (*(QueryResult*)c_search_result_on_bigIndex);
for (int i = 0; i < num_queries; ++i) {
auto offset = i * K;
ASSERT_EQ(search_result_on_bigIndex.internal_seg_offsets_[offset], 420000 + i);
ASSERT_EQ(search_result_on_bigIndex.result_distances_[offset],
search_result_on_raw_index->result_distances_[offset]);
}
DeleteLoadIndexInfo(c_load_index_info);
DeletePlan(plan);
DeletePlaceholderGroup(placeholderGroup);
DeleteQueryResult(c_search_result_on_smallIndex);
DeleteQueryResult(c_search_result_on_bigIndex);
DeleteCollection(collection);
DeleteSegment(segment);
}
TEST(CApiTest, UpdateSegmentIndex_With_Predicate_Term) {
// insert data to segment
constexpr auto DIM = 16;
constexpr auto K = 5;
std::string schema_string = generate_collection_shema("L2", "16");
auto collection = NewCollection(schema_string.c_str());
auto schema = ((segcore::Collection*)collection)->get_schema();
auto segment = NewSegment(collection, 0);
auto N = 1000 * 1000;
auto dataset = DataGen(schema, N);
auto vec_col = dataset.get_col<float>(0);
auto query_ptr = vec_col.data() + 420000 * DIM;
PreInsert(segment, N);
auto ins_res = Insert(segment, 0, N, dataset.row_ids_.data(), dataset.timestamps_.data(), dataset.raw_.raw_data,
dataset.raw_.sizeof_per_row, dataset.raw_.count);
assert(ins_res.error_code == Success);
const char* dsl_string = R"({
"bool": {
"must": [
{
"term": {
"counter": {
"values": [420000, 420001, 420002, 420003, 420004]
}
}
},
{
"vector": {
"fakevec": {
"metric_type": "L2",
"params": {
"nprobe": 10
},
"query": "$0",
"topk": 5
}
}
}
]
}
})";
// create place_holder_group
int num_queries = 5;
auto raw_group = CreatePlaceholderGroupFromBlob(num_queries, DIM, query_ptr);
auto blob = raw_group.SerializeAsString();
// search on segment's small index
void* plan = nullptr;
auto status = CreatePlan(collection, dsl_string, &plan);
assert(status.error_code == Success);
void* placeholderGroup = nullptr;
status = ParsePlaceholderGroup(plan, blob.data(), blob.length(), &placeholderGroup);
assert(status.error_code == Success);
std::vector<CPlaceholderGroup> placeholderGroups;
placeholderGroups.push_back(placeholderGroup);
Timestamp time = 10000000;
CQueryResult c_search_result_on_smallIndex;
auto res_before_load_index =
Search(segment, plan, placeholderGroups.data(), &time, 1, &c_search_result_on_smallIndex);
assert(res_before_load_index.error_code == Success);
// load index to segment
auto conf = milvus::knowhere::Config{{milvus::knowhere::meta::DIM, DIM},
{milvus::knowhere::meta::TOPK, K},
{milvus::knowhere::IndexParams::nlist, 100},
{milvus::knowhere::IndexParams::nprobe, 10},
{milvus::knowhere::IndexParams::m, 4},
{milvus::knowhere::IndexParams::nbits, 8},
{milvus::knowhere::Metric::TYPE, milvus::knowhere::Metric::L2},
{milvus::knowhere::meta::DEVICEID, 0}};
auto indexing = generate_index(vec_col.data(), conf, DIM, K, N, IndexEnum::INDEX_FAISS_IVFPQ);
// gen query dataset
auto query_dataset = milvus::knowhere::GenDataset(num_queries, DIM, query_ptr);
auto result_on_index = indexing->Query(query_dataset, conf, nullptr);
auto ids = result_on_index->Get<int64_t*>(milvus::knowhere::meta::IDS);
auto dis = result_on_index->Get<float*>(milvus::knowhere::meta::DISTANCE);
std::vector<int64_t> vec_ids(ids, ids + K * num_queries);
std::vector<float> vec_dis;
for (int j = 0; j < K * num_queries; ++j) {
vec_dis.push_back(dis[j] * -1);
}
auto search_result_on_raw_index = (QueryResult*)c_search_result_on_smallIndex;
search_result_on_raw_index->internal_seg_offsets_ = vec_ids;
search_result_on_raw_index->result_distances_ = vec_dis;
auto binary_set = indexing->Serialize(conf);
void* c_load_index_info = nullptr;
status = NewLoadIndexInfo(&c_load_index_info);
assert(status.error_code == Success);
std::string index_type_key = "index_type";
std::string index_type_value = "IVF_PQ";
std::string index_mode_key = "index_mode";
std::string index_mode_value = "cpu";
std::string metric_type_key = "metric_type";
std::string metric_type_value = "L2";
AppendIndexParam(c_load_index_info, index_type_key.c_str(), index_type_value.c_str());
AppendIndexParam(c_load_index_info, index_mode_key.c_str(), index_mode_value.c_str());
AppendIndexParam(c_load_index_info, metric_type_key.c_str(), metric_type_value.c_str());
AppendFieldInfo(c_load_index_info, "fakevec", 0);
AppendIndex(c_load_index_info, (CBinarySet)&binary_set);
status = UpdateSegmentIndex(segment, c_load_index_info);
assert(status.error_code == Success);
CQueryResult c_search_result_on_bigIndex;
auto res_after_load_index = Search(segment, plan, placeholderGroups.data(), &time, 1, &c_search_result_on_bigIndex);
assert(res_after_load_index.error_code == Success);
auto search_result_on_bigIndex = (*(QueryResult*)c_search_result_on_bigIndex);
for (int i = 0; i < num_queries; ++i) {
auto offset = i * K;
ASSERT_EQ(search_result_on_bigIndex.internal_seg_offsets_[offset], 420000 + i);
ASSERT_EQ(search_result_on_bigIndex.result_distances_[offset],
search_result_on_raw_index->result_distances_[offset]);
}
DeleteLoadIndexInfo(c_load_index_info);
DeletePlan(plan);
DeletePlaceholderGroup(placeholderGroup);
DeleteQueryResult(c_search_result_on_smallIndex);
DeleteQueryResult(c_search_result_on_bigIndex);
DeleteCollection(collection);
DeleteSegment(segment);
}

12
internal/master/flush_scheduler.go
View File

@ -68,18 +68,6 @@ func (scheduler *FlushScheduler) describe() error {
return err
}
for fieldID, data := range mapData {
// check field indexable
segMeta, err := scheduler.metaTable.GetSegmentByID(singleSegmentID)
if err != nil {
return err
}
indexable, err := scheduler.metaTable.IsIndexable(segMeta.CollectionID, fieldID)
if err != nil {
return err
}
if !indexable {
continue
}
info := &IndexBuildInfo{
segmentID: singleSegmentID,
fieldID: fieldID,

22
internal/master/meta_table.go
View File

@ -5,8 +5,6 @@ import (
"strconv"
"sync"
"github.com/zilliztech/milvus-distributed/internal/proto/schemapb"
"github.com/zilliztech/milvus-distributed/internal/proto/commonpb"
"github.com/zilliztech/milvus-distributed/internal/util/typeutil"
@ -680,23 +678,3 @@ func (mt *metaTable) UpdateFieldIndexParams(collName string, fieldName string, i
return fmt.Errorf("can not find field with id %s", fieldName)
}
func (mt *metaTable) IsIndexable(collID UniqueID, fieldID UniqueID) (bool, error) {
mt.ddLock.RLock()
defer mt.ddLock.RUnlock()
if _, ok := mt.collID2Meta[collID]; !ok {
return false, fmt.Errorf("can not find collection with id %d", collID)
}
for _, v := range mt.collID2Meta[collID].Schema.Fields {
// field is vector type and index params is not empty
if v.FieldID == fieldID && (v.DataType == schemapb.DataType_VECTOR_BINARY || v.DataType == schemapb.DataType_VECTOR_FLOAT) &&
len(v.IndexParams) != 0 {
return true, nil
}
}
// fieldID is not in schema(eg: timestamp) or not indexable
return false, nil
}

4
internal/master/persistence_scheduler_test.go
View File

@ -5,8 +5,6 @@ import (
"testing"
"time"
"github.com/zilliztech/milvus-distributed/internal/proto/commonpb"
"github.com/zilliztech/milvus-distributed/internal/proto/etcdpb"
"github.com/zilliztech/milvus-distributed/internal/proto/schemapb"
@ -45,7 +43,7 @@ func TestPersistenceScheduler(t *testing.T) {
Name: "testcoll",
Fields: []*schemapb.FieldSchema{
{FieldID: 1},
{FieldID: 100, DataType: schemapb.DataType_VECTOR_FLOAT, IndexParams: []*commonpb.KeyValuePair{{Key: "k", Value: "v"}}},
{FieldID: 100},
},
},
})

17
internal/querynode/load_index_service_test.go
View File

@ -16,23 +16,6 @@ import (
"github.com/zilliztech/milvus-distributed/internal/querynode/client"
)
//func TestLoadIndexClient_LoadIndex(t *testing.T) {
// pulsarURL := Params.PulsarAddress
// loadIndexChannels := Params.LoadIndexChannelNames
// loadIndexClient := client.NewLoadIndexClient(context.Background(), pulsarURL, loadIndexChannels)
//
// loadIndexPath := "collection0-segment0-field0"
// loadIndexPaths := make([]string, 0)
// loadIndexPaths = append(loadIndexPaths, loadIndexPath)
//
// indexParams := make(map[string]string)
// indexParams["index_type"] = "IVF_PQ"
// indexParams["index_mode"] = "cpu"
//
// loadIndexClient.LoadIndex(loadIndexPaths, 0, 0, "field0", indexParams)
// loadIndexClient.Close()
//}
func TestLoadIndexService(t *testing.T) {
node := newQueryNode()
collectionID := rand.Int63n(1000000)