diff --git a/Makefile b/Makefile
index 45bfe9be86..0807d15e66 100644
--- a/Makefile
+++ b/Makefile
@@ -113,7 +113,6 @@ unittest: test-cpp test-go
 
 test-go: build-cpp-with-unittest
 	@echo "Running go unittests..."
-	@echo "disable go unittest for now, enable it later"
 	@(env bash $(PWD)/scripts/run_go_codecov.sh)
 # 	@(env bash $(PWD)/scripts/run_go_unittest.sh)
 
diff --git a/configs/advanced/proxy.yaml b/configs/advanced/proxy.yaml
index 23a5456c80..3c7400692f 100644
--- a/configs/advanced/proxy.yaml
+++ b/configs/advanced/proxy.yaml
@@ -29,3 +29,4 @@ proxy:
   maxNameLength: 255
   maxFieldNum: 64
   maxDimension: 32768
+  maxShardNum: 256
diff --git a/configs/advanced/root_coord.yaml b/configs/advanced/root_coord.yaml
index 889a813eca..da851abcdf 100644
--- a/configs/advanced/root_coord.yaml
+++ b/configs/advanced/root_coord.yaml
@@ -10,7 +10,7 @@
 # or implied. See the License for the specific language governing permissions and limitations under the License.
 
 rootcoord:
-  dmlChannelNum: 64
+  dmlChannelNum: 256
   maxPartitionNum: 4096
   minSegmentSizeToEnableIndex: 1024
   timeout: 3600 # time out, 5 seconds
diff --git a/internal/core/src/pb/etcd_meta.pb.cc b/internal/core/src/pb/etcd_meta.pb.cc
index 35ede240a6..a259ba0c3a 100644
--- a/internal/core/src/pb/etcd_meta.pb.cc
+++ b/internal/core/src/pb/etcd_meta.pb.cc
@@ -207,6 +207,7 @@ const ::PROTOBUF_NAMESPACE_ID::uint32 TableStruct_etcd_5fmeta_2eproto::offsets[]
   PROTOBUF_FIELD_OFFSET(::milvus::proto::etcd::CollectionInfo, virtual_channel_names_),
   PROTOBUF_FIELD_OFFSET(::milvus::proto::etcd::CollectionInfo, physical_channel_names_),
   PROTOBUF_FIELD_OFFSET(::milvus::proto::etcd::CollectionInfo, partition_created_timestamps_),
+  PROTOBUF_FIELD_OFFSET(::milvus::proto::etcd::CollectionInfo, shards_num_),
   ~0u,  // no _has_bits_
   PROTOBUF_FIELD_OFFSET(::milvus::proto::etcd::SegmentIndexInfo, _internal_metadata_),
   ~0u,  // no _extensions_
@@ -237,8 +238,8 @@ static const ::PROTOBUF_NAMESPACE_ID::internal::MigrationSchema schemas[] PROTOB
   { 17, -1, sizeof(::milvus::proto::etcd::IndexInfo)},
   { 25, -1, sizeof(::milvus::proto::etcd::FieldIndexInfo)},
   { 32, -1, sizeof(::milvus::proto::etcd::CollectionInfo)},
-  { 46, -1, sizeof(::milvus::proto::etcd::SegmentIndexInfo)},
-  { 58, -1, sizeof(::milvus::proto::etcd::CollectionMeta)},
+  { 47, -1, sizeof(::milvus::proto::etcd::SegmentIndexInfo)},
+  { 59, -1, sizeof(::milvus::proto::etcd::CollectionMeta)},
 };
 
 static ::PROTOBUF_NAMESPACE_ID::Message const * const file_default_instances[] = {
@@ -262,7 +263,7 @@ const char descriptor_table_protodef_etcd_5fmeta_2eproto[] PROTOBUF_SECTION_VARI
   "\022\n\nindex_name\030\001 \001(\t\022\017\n\007indexID\030\002 \001(\003\0227\n\014"
   "index_params\030\003 \003(\0132!.milvus.proto.common"
   ".KeyValuePair\"2\n\016FieldIndexInfo\022\017\n\007filed"
-  "ID\030\001 \001(\003\022\017\n\007indexID\030\002 \001(\003\"\265\002\n\016Collection"
+  "ID\030\001 \001(\003\022\017\n\007indexID\030\002 \001(\003\"\311\002\n\016Collection"
   "Info\022\n\n\002ID\030\001 \001(\003\0225\n\006schema\030\002 \001(\0132%.milvu"
   "s.proto.schema.CollectionSchema\022\023\n\013creat"
   "e_time\030\003 \001(\004\022\024\n\014partitionIDs\030\004 \003(\003\022\026\n\016pa"
@@ -270,17 +271,17 @@ const char descriptor_table_protodef_etcd_5fmeta_2eproto[] PROTOBUF_SECTION_VARI
   "\0132!.milvus.proto.etcd.FieldIndexInfo\022\035\n\025"
   "virtual_channel_names\030\007 \003(\t\022\036\n\026physical_"
   "channel_names\030\010 \003(\t\022$\n\034partition_created"
-  "_timestamps\030\t \003(\004\"\231\001\n\020SegmentIndexInfo\022\024"
-  "\n\014collectionID\030\001 \001(\003\022\023\n\013partitionID\030\002 \001("
-  "\003\022\021\n\tsegmentID\030\003 \001(\003\022\017\n\007fieldID\030\004 \001(\003\022\017\n"
-  "\007indexID\030\005 \001(\003\022\017\n\007buildID\030\006 \001(\003\022\024\n\014enabl"
-  "e_index\030\007 \001(\010\"\252\001\n\016CollectionMeta\022\n\n\002ID\030\001"
-  " \001(\003\0225\n\006schema\030\002 \001(\0132%.milvus.proto.sche"
-  "ma.CollectionSchema\022\023\n\013create_time\030\003 \001(\004"
-  "\022\022\n\nsegmentIDs\030\004 \003(\003\022\026\n\016partition_tags\030\005"
-  " \003(\t\022\024\n\014partitionIDs\030\006 \003(\003B3Z1github.com"
-  "/milvus-io/milvus/internal/proto/etcdpbb"
-  "\006proto3"
+  "_timestamps\030\t \003(\004\022\022\n\nshards_num\030\n \001(\005\"\231\001"
+  "\n\020SegmentIndexInfo\022\024\n\014collectionID\030\001 \001(\003"
+  "\022\023\n\013partitionID\030\002 \001(\003\022\021\n\tsegmentID\030\003 \001(\003"
+  "\022\017\n\007fieldID\030\004 \001(\003\022\017\n\007indexID\030\005 \001(\003\022\017\n\007bu"
+  "ildID\030\006 \001(\003\022\024\n\014enable_index\030\007 \001(\010\"\252\001\n\016Co"
+  "llectionMeta\022\n\n\002ID\030\001 \001(\003\0225\n\006schema\030\002 \001(\013"
+  "2%.milvus.proto.schema.CollectionSchema\022"
+  "\023\n\013create_time\030\003 \001(\004\022\022\n\nsegmentIDs\030\004 \003(\003"
+  "\022\026\n\016partition_tags\030\005 \003(\t\022\024\n\014partitionIDs"
+  "\030\006 \003(\003B3Z1github.com/milvus-io/milvus/in"
+  "ternal/proto/etcdpbb\006proto3"
   ;
 static const ::PROTOBUF_NAMESPACE_ID::internal::DescriptorTable*const descriptor_table_etcd_5fmeta_2eproto_deps[2] = {
   &::descriptor_table_common_2eproto,
@@ -298,7 +299,7 @@ static ::PROTOBUF_NAMESPACE_ID::internal::SCCInfoBase*const descriptor_table_etc
 static ::PROTOBUF_NAMESPACE_ID::internal::once_flag descriptor_table_etcd_5fmeta_2eproto_once;
 static bool descriptor_table_etcd_5fmeta_2eproto_initialized = false;
 const ::PROTOBUF_NAMESPACE_ID::internal::DescriptorTable descriptor_table_etcd_5fmeta_2eproto = {
-  &descriptor_table_etcd_5fmeta_2eproto_initialized, descriptor_table_protodef_etcd_5fmeta_2eproto, "etcd_meta.proto", 1127,
+  &descriptor_table_etcd_5fmeta_2eproto_initialized, descriptor_table_protodef_etcd_5fmeta_2eproto, "etcd_meta.proto", 1147,
   &descriptor_table_etcd_5fmeta_2eproto_once, descriptor_table_etcd_5fmeta_2eproto_sccs, descriptor_table_etcd_5fmeta_2eproto_deps, 7, 2,
   schemas, file_default_instances, TableStruct_etcd_5fmeta_2eproto::offsets,
   file_level_metadata_etcd_5fmeta_2eproto, 7, file_level_enum_descriptors_etcd_5fmeta_2eproto, file_level_service_descriptors_etcd_5fmeta_2eproto,
@@ -1816,16 +1817,16 @@ CollectionInfo::CollectionInfo(const CollectionInfo& from)
     schema_ = nullptr;
   }
   ::memcpy(&id_, &from.id_,
-    static_cast<size_t>(reinterpret_cast<char*>(&create_time_) -
-    reinterpret_cast<char*>(&id_)) + sizeof(create_time_));
+    static_cast<size_t>(reinterpret_cast<char*>(&shards_num_) -
+    reinterpret_cast<char*>(&id_)) + sizeof(shards_num_));
   // @@protoc_insertion_point(copy_constructor:milvus.proto.etcd.CollectionInfo)
 }
 
 void CollectionInfo::SharedCtor() {
   ::PROTOBUF_NAMESPACE_ID::internal::InitSCC(&scc_info_CollectionInfo_etcd_5fmeta_2eproto.base);
   ::memset(&schema_, 0, static_cast<size_t>(
-      reinterpret_cast<char*>(&create_time_) -
-      reinterpret_cast<char*>(&schema_)) + sizeof(create_time_));
+      reinterpret_cast<char*>(&shards_num_) -
+      reinterpret_cast<char*>(&schema_)) + sizeof(shards_num_));
 }
 
 CollectionInfo::~CollectionInfo() {
@@ -1863,8 +1864,8 @@ void CollectionInfo::Clear() {
   }
   schema_ = nullptr;
   ::memset(&id_, 0, static_cast<size_t>(
-      reinterpret_cast<char*>(&create_time_) -
-      reinterpret_cast<char*>(&id_)) + sizeof(create_time_));
+      reinterpret_cast<char*>(&shards_num_) -
+      reinterpret_cast<char*>(&id_)) + sizeof(shards_num_));
   _internal_metadata_.Clear();
 }
 
@@ -1965,6 +1966,13 @@ const char* CollectionInfo::_InternalParse(const char* ptr, ::PROTOBUF_NAMESPACE
           CHK_(ptr);
         } else goto handle_unusual;
         continue;
+      // int32 shards_num = 10;
+      case 10:
+        if (PROTOBUF_PREDICT_TRUE(static_cast<::PROTOBUF_NAMESPACE_ID::uint8>(tag) == 80)) {
+          shards_num_ = ::PROTOBUF_NAMESPACE_ID::internal::ReadVarint(&ptr);
+          CHK_(ptr);
+        } else goto handle_unusual;
+        continue;
       default: {
       handle_unusual:
         if ((tag & 7) == 4 || tag == 0) {
@@ -2123,6 +2131,19 @@ bool CollectionInfo::MergePartialFromCodedStream(
         break;
       }
 
+      // int32 shards_num = 10;
+      case 10: {
+        if (static_cast< ::PROTOBUF_NAMESPACE_ID::uint8>(tag) == (80 & 0xFF)) {
+
+          DO_((::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::ReadPrimitive<
+                   ::PROTOBUF_NAMESPACE_ID::int32, ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::TYPE_INT32>(
+                 input, &shards_num_)));
+        } else {
+          goto handle_unusual;
+        }
+        break;
+      }
+
       default: {
       handle_unusual:
         if (tag == 0) {
@@ -2227,6 +2248,11 @@ void CollectionInfo::SerializeWithCachedSizes(
       this->partition_created_timestamps(i), output);
   }
 
+  // int32 shards_num = 10;
+  if (this->shards_num() != 0) {
+    ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::WriteInt32(10, this->shards_num(), output);
+  }
+
   if (_internal_metadata_.have_unknown_fields()) {
     ::PROTOBUF_NAMESPACE_ID::internal::WireFormat::SerializeUnknownFields(
         _internal_metadata_.unknown_fields(), output);
@@ -2321,6 +2347,11 @@ void CollectionInfo::SerializeWithCachedSizes(
       WriteUInt64NoTagToArray(this->partition_created_timestamps_, target);
   }
 
+  // int32 shards_num = 10;
+  if (this->shards_num() != 0) {
+    target = ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::WriteInt32ToArray(10, this->shards_num(), target);
+  }
+
   if (_internal_metadata_.have_unknown_fields()) {
     target = ::PROTOBUF_NAMESPACE_ID::internal::WireFormat::SerializeUnknownFieldsToArray(
         _internal_metadata_.unknown_fields(), target);
@@ -2428,6 +2459,13 @@ size_t CollectionInfo::ByteSizeLong() const {
         this->create_time());
   }
 
+  // int32 shards_num = 10;
+  if (this->shards_num() != 0) {
+    total_size += 1 +
+      ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::Int32Size(
+        this->shards_num());
+  }
+
   int cached_size = ::PROTOBUF_NAMESPACE_ID::internal::ToCachedSize(total_size);
   SetCachedSize(cached_size);
   return total_size;
@@ -2470,6 +2508,9 @@ void CollectionInfo::MergeFrom(const CollectionInfo& from) {
   if (from.create_time() != 0) {
     set_create_time(from.create_time());
   }
+  if (from.shards_num() != 0) {
+    set_shards_num(from.shards_num());
+  }
 }
 
 void CollectionInfo::CopyFrom(const ::PROTOBUF_NAMESPACE_ID::Message& from) {
@@ -2502,6 +2543,7 @@ void CollectionInfo::InternalSwap(CollectionInfo* other) {
   swap(schema_, other->schema_);
   swap(id_, other->id_);
   swap(create_time_, other->create_time_);
+  swap(shards_num_, other->shards_num_);
 }
 
 ::PROTOBUF_NAMESPACE_ID::Metadata CollectionInfo::GetMetadata() const {
diff --git a/internal/core/src/pb/etcd_meta.pb.h b/internal/core/src/pb/etcd_meta.pb.h
index 2f54b162d3..b549d0b6ab 100644
--- a/internal/core/src/pb/etcd_meta.pb.h
+++ b/internal/core/src/pb/etcd_meta.pb.h
@@ -845,6 +845,7 @@ class CollectionInfo :
     kSchemaFieldNumber = 2,
     kIDFieldNumber = 1,
     kCreateTimeFieldNumber = 3,
+    kShardsNumFieldNumber = 10,
   };
   // repeated int64 partitionIDs = 4;
   int partitionids_size() const;
@@ -948,6 +949,11 @@ class CollectionInfo :
   ::PROTOBUF_NAMESPACE_ID::uint64 create_time() const;
   void set_create_time(::PROTOBUF_NAMESPACE_ID::uint64 value);
 
+  // int32 shards_num = 10;
+  void clear_shards_num();
+  ::PROTOBUF_NAMESPACE_ID::int32 shards_num() const;
+  void set_shards_num(::PROTOBUF_NAMESPACE_ID::int32 value);
+
   // @@protoc_insertion_point(class_scope:milvus.proto.etcd.CollectionInfo)
  private:
   class _Internal;
@@ -964,6 +970,7 @@ class CollectionInfo :
   ::milvus::proto::schema::CollectionSchema* schema_;
   ::PROTOBUF_NAMESPACE_ID::int64 id_;
   ::PROTOBUF_NAMESPACE_ID::uint64 create_time_;
+  ::PROTOBUF_NAMESPACE_ID::int32 shards_num_;
   mutable ::PROTOBUF_NAMESPACE_ID::internal::CachedSize _cached_size_;
   friend struct ::TableStruct_etcd_5fmeta_2eproto;
 };
@@ -2108,6 +2115,20 @@ CollectionInfo::mutable_partition_created_timestamps() {
   return &partition_created_timestamps_;
 }
 
+// int32 shards_num = 10;
+inline void CollectionInfo::clear_shards_num() {
+  shards_num_ = 0;
+}
+inline ::PROTOBUF_NAMESPACE_ID::int32 CollectionInfo::shards_num() const {
+  // @@protoc_insertion_point(field_get:milvus.proto.etcd.CollectionInfo.shards_num)
+  return shards_num_;
+}
+inline void CollectionInfo::set_shards_num(::PROTOBUF_NAMESPACE_ID::int32 value) {
+  
+  shards_num_ = value;
+  // @@protoc_insertion_point(field_set:milvus.proto.etcd.CollectionInfo.shards_num)
+}
+
 // -------------------------------------------------------------------
 
 // SegmentIndexInfo
diff --git a/internal/core/src/pb/milvus.pb.cc b/internal/core/src/pb/milvus.pb.cc
index c301786245..fdbedb0858 100644
--- a/internal/core/src/pb/milvus.pb.cc
+++ b/internal/core/src/pb/milvus.pb.cc
@@ -1339,6 +1339,7 @@ const ::PROTOBUF_NAMESPACE_ID::uint32 TableStruct_milvus_2eproto::offsets[] PROT
   PROTOBUF_FIELD_OFFSET(::milvus::proto::milvus::DescribeCollectionResponse, physical_channel_names_),
   PROTOBUF_FIELD_OFFSET(::milvus::proto::milvus::DescribeCollectionResponse, created_timestamp_),
   PROTOBUF_FIELD_OFFSET(::milvus::proto::milvus::DescribeCollectionResponse, created_utc_timestamp_),
+  PROTOBUF_FIELD_OFFSET(::milvus::proto::milvus::DescribeCollectionResponse, shards_num_),
   ~0u,  // no _has_bits_
   PROTOBUF_FIELD_OFFSET(::milvus::proto::milvus::LoadCollectionRequest, _internal_metadata_),
   ~0u,  // no _extensions_
@@ -1849,63 +1850,63 @@ static const ::PROTOBUF_NAMESPACE_ID::internal::MigrationSchema schemas[] PROTOB
   { 34, -1, sizeof(::milvus::proto::milvus::StringResponse)},
   { 41, -1, sizeof(::milvus::proto::milvus::DescribeCollectionRequest)},
   { 51, -1, sizeof(::milvus::proto::milvus::DescribeCollectionResponse)},
-  { 63, -1, sizeof(::milvus::proto::milvus::LoadCollectionRequest)},
-  { 71, -1, sizeof(::milvus::proto::milvus::ReleaseCollectionRequest)},
-  { 79, -1, sizeof(::milvus::proto::milvus::GetCollectionStatisticsRequest)},
-  { 87, -1, sizeof(::milvus::proto::milvus::GetCollectionStatisticsResponse)},
-  { 94, -1, sizeof(::milvus::proto::milvus::ShowCollectionsRequest)},
-  { 104, -1, sizeof(::milvus::proto::milvus::ShowCollectionsResponse)},
-  { 115, -1, sizeof(::milvus::proto::milvus::CreatePartitionRequest)},
-  { 124, -1, sizeof(::milvus::proto::milvus::DropPartitionRequest)},
-  { 133, -1, sizeof(::milvus::proto::milvus::HasPartitionRequest)},
-  { 142, -1, sizeof(::milvus::proto::milvus::LoadPartitionsRequest)},
-  { 151, -1, sizeof(::milvus::proto::milvus::ReleasePartitionsRequest)},
-  { 160, -1, sizeof(::milvus::proto::milvus::GetPartitionStatisticsRequest)},
-  { 169, -1, sizeof(::milvus::proto::milvus::GetPartitionStatisticsResponse)},
-  { 176, -1, sizeof(::milvus::proto::milvus::ShowPartitionsRequest)},
-  { 187, -1, sizeof(::milvus::proto::milvus::ShowPartitionsResponse)},
-  { 198, -1, sizeof(::milvus::proto::milvus::DescribeSegmentRequest)},
-  { 206, -1, sizeof(::milvus::proto::milvus::DescribeSegmentResponse)},
-  { 215, -1, sizeof(::milvus::proto::milvus::ShowSegmentsRequest)},
-  { 223, -1, sizeof(::milvus::proto::milvus::ShowSegmentsResponse)},
-  { 230, -1, sizeof(::milvus::proto::milvus::CreateIndexRequest)},
-  { 240, -1, sizeof(::milvus::proto::milvus::DescribeIndexRequest)},
-  { 250, -1, sizeof(::milvus::proto::milvus::IndexDescription)},
-  { 259, -1, sizeof(::milvus::proto::milvus::DescribeIndexResponse)},
-  { 266, -1, sizeof(::milvus::proto::milvus::GetIndexBuildProgressRequest)},
-  { 276, -1, sizeof(::milvus::proto::milvus::GetIndexBuildProgressResponse)},
-  { 284, -1, sizeof(::milvus::proto::milvus::GetIndexStateRequest)},
-  { 294, -1, sizeof(::milvus::proto::milvus::GetIndexStateResponse)},
-  { 302, -1, sizeof(::milvus::proto::milvus::DropIndexRequest)},
-  { 312, -1, sizeof(::milvus::proto::milvus::InsertRequest)},
-  { 324, -1, sizeof(::milvus::proto::milvus::MutationResult)},
-  { 338, -1, sizeof(::milvus::proto::milvus::DeleteRequest)},
-  { 348, -1, sizeof(::milvus::proto::milvus::PlaceholderValue)},
-  { 356, -1, sizeof(::milvus::proto::milvus::PlaceholderGroup)},
-  { 362, -1, sizeof(::milvus::proto::milvus::SearchRequest)},
-  { 378, -1, sizeof(::milvus::proto::milvus::Hits)},
-  { 386, -1, sizeof(::milvus::proto::milvus::SearchResults)},
-  { 393, -1, sizeof(::milvus::proto::milvus::FlushRequest)},
-  { 401, 408, sizeof(::milvus::proto::milvus::FlushResponse_CollSegIDsEntry_DoNotUse)},
-  { 410, -1, sizeof(::milvus::proto::milvus::FlushResponse)},
-  { 418, -1, sizeof(::milvus::proto::milvus::QueryRequest)},
-  { 431, -1, sizeof(::milvus::proto::milvus::QueryResults)},
-  { 438, -1, sizeof(::milvus::proto::milvus::VectorIDs)},
-  { 447, -1, sizeof(::milvus::proto::milvus::VectorsArray)},
-  { 455, -1, sizeof(::milvus::proto::milvus::CalcDistanceRequest)},
-  { 464, -1, sizeof(::milvus::proto::milvus::CalcDistanceResults)},
-  { 473, -1, sizeof(::milvus::proto::milvus::PersistentSegmentInfo)},
-  { 483, -1, sizeof(::milvus::proto::milvus::GetPersistentSegmentInfoRequest)},
-  { 491, -1, sizeof(::milvus::proto::milvus::GetPersistentSegmentInfoResponse)},
-  { 498, -1, sizeof(::milvus::proto::milvus::QuerySegmentInfo)},
-  { 510, -1, sizeof(::milvus::proto::milvus::GetQuerySegmentInfoRequest)},
-  { 518, -1, sizeof(::milvus::proto::milvus::GetQuerySegmentInfoResponse)},
-  { 525, -1, sizeof(::milvus::proto::milvus::DummyRequest)},
-  { 531, -1, sizeof(::milvus::proto::milvus::DummyResponse)},
-  { 537, -1, sizeof(::milvus::proto::milvus::RegisterLinkRequest)},
-  { 542, -1, sizeof(::milvus::proto::milvus::RegisterLinkResponse)},
-  { 549, -1, sizeof(::milvus::proto::milvus::GetMetricsRequest)},
-  { 556, -1, sizeof(::milvus::proto::milvus::GetMetricsResponse)},
+  { 64, -1, sizeof(::milvus::proto::milvus::LoadCollectionRequest)},
+  { 72, -1, sizeof(::milvus::proto::milvus::ReleaseCollectionRequest)},
+  { 80, -1, sizeof(::milvus::proto::milvus::GetCollectionStatisticsRequest)},
+  { 88, -1, sizeof(::milvus::proto::milvus::GetCollectionStatisticsResponse)},
+  { 95, -1, sizeof(::milvus::proto::milvus::ShowCollectionsRequest)},
+  { 105, -1, sizeof(::milvus::proto::milvus::ShowCollectionsResponse)},
+  { 116, -1, sizeof(::milvus::proto::milvus::CreatePartitionRequest)},
+  { 125, -1, sizeof(::milvus::proto::milvus::DropPartitionRequest)},
+  { 134, -1, sizeof(::milvus::proto::milvus::HasPartitionRequest)},
+  { 143, -1, sizeof(::milvus::proto::milvus::LoadPartitionsRequest)},
+  { 152, -1, sizeof(::milvus::proto::milvus::ReleasePartitionsRequest)},
+  { 161, -1, sizeof(::milvus::proto::milvus::GetPartitionStatisticsRequest)},
+  { 170, -1, sizeof(::milvus::proto::milvus::GetPartitionStatisticsResponse)},
+  { 177, -1, sizeof(::milvus::proto::milvus::ShowPartitionsRequest)},
+  { 188, -1, sizeof(::milvus::proto::milvus::ShowPartitionsResponse)},
+  { 199, -1, sizeof(::milvus::proto::milvus::DescribeSegmentRequest)},
+  { 207, -1, sizeof(::milvus::proto::milvus::DescribeSegmentResponse)},
+  { 216, -1, sizeof(::milvus::proto::milvus::ShowSegmentsRequest)},
+  { 224, -1, sizeof(::milvus::proto::milvus::ShowSegmentsResponse)},
+  { 231, -1, sizeof(::milvus::proto::milvus::CreateIndexRequest)},
+  { 241, -1, sizeof(::milvus::proto::milvus::DescribeIndexRequest)},
+  { 251, -1, sizeof(::milvus::proto::milvus::IndexDescription)},
+  { 260, -1, sizeof(::milvus::proto::milvus::DescribeIndexResponse)},
+  { 267, -1, sizeof(::milvus::proto::milvus::GetIndexBuildProgressRequest)},
+  { 277, -1, sizeof(::milvus::proto::milvus::GetIndexBuildProgressResponse)},
+  { 285, -1, sizeof(::milvus::proto::milvus::GetIndexStateRequest)},
+  { 295, -1, sizeof(::milvus::proto::milvus::GetIndexStateResponse)},
+  { 303, -1, sizeof(::milvus::proto::milvus::DropIndexRequest)},
+  { 313, -1, sizeof(::milvus::proto::milvus::InsertRequest)},
+  { 325, -1, sizeof(::milvus::proto::milvus::MutationResult)},
+  { 339, -1, sizeof(::milvus::proto::milvus::DeleteRequest)},
+  { 349, -1, sizeof(::milvus::proto::milvus::PlaceholderValue)},
+  { 357, -1, sizeof(::milvus::proto::milvus::PlaceholderGroup)},
+  { 363, -1, sizeof(::milvus::proto::milvus::SearchRequest)},
+  { 379, -1, sizeof(::milvus::proto::milvus::Hits)},
+  { 387, -1, sizeof(::milvus::proto::milvus::SearchResults)},
+  { 394, -1, sizeof(::milvus::proto::milvus::FlushRequest)},
+  { 402, 409, sizeof(::milvus::proto::milvus::FlushResponse_CollSegIDsEntry_DoNotUse)},
+  { 411, -1, sizeof(::milvus::proto::milvus::FlushResponse)},
+  { 419, -1, sizeof(::milvus::proto::milvus::QueryRequest)},
+  { 432, -1, sizeof(::milvus::proto::milvus::QueryResults)},
+  { 439, -1, sizeof(::milvus::proto::milvus::VectorIDs)},
+  { 448, -1, sizeof(::milvus::proto::milvus::VectorsArray)},
+  { 456, -1, sizeof(::milvus::proto::milvus::CalcDistanceRequest)},
+  { 465, -1, sizeof(::milvus::proto::milvus::CalcDistanceResults)},
+  { 474, -1, sizeof(::milvus::proto::milvus::PersistentSegmentInfo)},
+  { 484, -1, sizeof(::milvus::proto::milvus::GetPersistentSegmentInfoRequest)},
+  { 492, -1, sizeof(::milvus::proto::milvus::GetPersistentSegmentInfoResponse)},
+  { 499, -1, sizeof(::milvus::proto::milvus::QuerySegmentInfo)},
+  { 511, -1, sizeof(::milvus::proto::milvus::GetQuerySegmentInfoRequest)},
+  { 519, -1, sizeof(::milvus::proto::milvus::GetQuerySegmentInfoResponse)},
+  { 526, -1, sizeof(::milvus::proto::milvus::DummyRequest)},
+  { 532, -1, sizeof(::milvus::proto::milvus::DummyResponse)},
+  { 538, -1, sizeof(::milvus::proto::milvus::RegisterLinkRequest)},
+  { 543, -1, sizeof(::milvus::proto::milvus::RegisterLinkResponse)},
+  { 550, -1, sizeof(::milvus::proto::milvus::GetMetricsRequest)},
+  { 557, -1, sizeof(::milvus::proto::milvus::GetMetricsResponse)},
 };
 
 static ::PROTOBUF_NAMESPACE_ID::Message const * const file_default_instances[] = {
@@ -1995,296 +1996,297 @@ const char descriptor_table_protodef_milvus_2eproto[] PROTOBUF_SECTION_VARIABLE(
   "*\n\004base\030\001 \001(\0132\034.milvus.proto.common.MsgB"
   "ase\022\017\n\007db_name\030\002 \001(\t\022\027\n\017collection_name\030"
   "\003 \001(\t\022\024\n\014collectionID\030\004 \001(\003\022\022\n\ntime_stam"
-  "p\030\005 \001(\004\"\217\002\n\032DescribeCollectionResponse\022+"
+  "p\030\005 \001(\004\"\243\002\n\032DescribeCollectionResponse\022+"
   "\n\006status\030\001 \001(\0132\033.milvus.proto.common.Sta"
   "tus\0225\n\006schema\030\002 \001(\0132%.milvus.proto.schem"
   "a.CollectionSchema\022\024\n\014collectionID\030\003 \001(\003"
   "\022\035\n\025virtual_channel_names\030\004 \003(\t\022\036\n\026physi"
   "cal_channel_names\030\005 \003(\t\022\031\n\021created_times"
   "tamp\030\006 \001(\004\022\035\n\025created_utc_timestamp\030\007 \001("
-  "\004\"m\n\025LoadCollectionRequest\022*\n\004base\030\001 \001(\013"
-  "2\034.milvus.proto.common.MsgBase\022\017\n\007db_nam"
-  "e\030\002 \001(\t\022\027\n\017collection_name\030\003 \001(\t\"p\n\030Rele"
-  "aseCollectionRequest\022*\n\004base\030\001 \001(\0132\034.mil"
-  "vus.proto.common.MsgBase\022\017\n\007db_name\030\002 \001("
-  "\t\022\027\n\017collection_name\030\003 \001(\t\"v\n\036GetCollect"
-  "ionStatisticsRequest\022*\n\004base\030\001 \001(\0132\034.mil"
-  "vus.proto.common.MsgBase\022\017\n\007db_name\030\002 \001("
-  "\t\022\027\n\017collection_name\030\003 \001(\t\"\200\001\n\037GetCollec"
-  "tionStatisticsResponse\022+\n\006status\030\001 \001(\0132\033"
-  ".milvus.proto.common.Status\0220\n\005stats\030\002 \003"
-  "(\0132!.milvus.proto.common.KeyValuePair\"\260\001"
-  "\n\026ShowCollectionsRequest\022*\n\004base\030\001 \001(\0132\034"
-  ".milvus.proto.common.MsgBase\022\017\n\007db_name\030"
-  "\002 \001(\t\022\022\n\ntime_stamp\030\003 \001(\004\022+\n\004type\030\004 \001(\0162"
-  "\035.milvus.proto.milvus.ShowType\022\030\n\020collec"
-  "tion_names\030\005 \003(\t\"\322\001\n\027ShowCollectionsResp"
-  "onse\022+\n\006status\030\001 \001(\0132\033.milvus.proto.comm"
-  "on.Status\022\030\n\020collection_names\030\002 \003(\t\022\026\n\016c"
-  "ollection_ids\030\003 \003(\003\022\032\n\022created_timestamp"
-  "s\030\004 \003(\004\022\036\n\026created_utc_timestamps\030\005 \003(\004\022"
-  "\034\n\024inMemory_percentages\030\006 \003(\003\"\206\001\n\026Create"
-  "PartitionRequest\022*\n\004base\030\001 \001(\0132\034.milvus."
-  "proto.common.MsgBase\022\017\n\007db_name\030\002 \001(\t\022\027\n"
-  "\017collection_name\030\003 \001(\t\022\026\n\016partition_name"
-  "\030\004 \001(\t\"\204\001\n\024DropPartitionRequest\022*\n\004base\030"
-  "\001 \001(\0132\034.milvus.proto.common.MsgBase\022\017\n\007d"
-  "b_name\030\002 \001(\t\022\027\n\017collection_name\030\003 \001(\t\022\026\n"
-  "\016partition_name\030\004 \001(\t\"\203\001\n\023HasPartitionRe"
-  "quest\022*\n\004base\030\001 \001(\0132\034.milvus.proto.commo"
-  "n.MsgBase\022\017\n\007db_name\030\002 \001(\t\022\027\n\017collection"
-  "_name\030\003 \001(\t\022\026\n\016partition_name\030\004 \001(\t\"\206\001\n\025"
-  "LoadPartitionsRequest\022*\n\004base\030\001 \001(\0132\034.mi"
-  "lvus.proto.common.MsgBase\022\017\n\007db_name\030\002 \001"
-  "(\t\022\027\n\017collection_name\030\003 \001(\t\022\027\n\017partition"
-  "_names\030\004 \003(\t\"\211\001\n\030ReleasePartitionsReques"
+  "\004\022\022\n\nshards_num\030\010 \001(\005\"m\n\025LoadCollectionR"
+  "equest\022*\n\004base\030\001 \001(\0132\034.milvus.proto.comm"
+  "on.MsgBase\022\017\n\007db_name\030\002 \001(\t\022\027\n\017collectio"
+  "n_name\030\003 \001(\t\"p\n\030ReleaseCollectionRequest"
+  "\022*\n\004base\030\001 \001(\0132\034.milvus.proto.common.Msg"
+  "Base\022\017\n\007db_name\030\002 \001(\t\022\027\n\017collection_name"
+  "\030\003 \001(\t\"v\n\036GetCollectionStatisticsRequest"
+  "\022*\n\004base\030\001 \001(\0132\034.milvus.proto.common.Msg"
+  "Base\022\017\n\007db_name\030\002 \001(\t\022\027\n\017collection_name"
+  "\030\003 \001(\t\"\200\001\n\037GetCollectionStatisticsRespon"
+  "se\022+\n\006status\030\001 \001(\0132\033.milvus.proto.common"
+  ".Status\0220\n\005stats\030\002 \003(\0132!.milvus.proto.co"
+  "mmon.KeyValuePair\"\260\001\n\026ShowCollectionsReq"
+  "uest\022*\n\004base\030\001 \001(\0132\034.milvus.proto.common"
+  ".MsgBase\022\017\n\007db_name\030\002 \001(\t\022\022\n\ntime_stamp\030"
+  "\003 \001(\004\022+\n\004type\030\004 \001(\0162\035.milvus.proto.milvu"
+  "s.ShowType\022\030\n\020collection_names\030\005 \003(\t\"\322\001\n"
+  "\027ShowCollectionsResponse\022+\n\006status\030\001 \001(\013"
+  "2\033.milvus.proto.common.Status\022\030\n\020collect"
+  "ion_names\030\002 \003(\t\022\026\n\016collection_ids\030\003 \003(\003\022"
+  "\032\n\022created_timestamps\030\004 \003(\004\022\036\n\026created_u"
+  "tc_timestamps\030\005 \003(\004\022\034\n\024inMemory_percenta"
+  "ges\030\006 \003(\003\"\206\001\n\026CreatePartitionRequest\022*\n\004"
+  "base\030\001 \001(\0132\034.milvus.proto.common.MsgBase"
+  "\022\017\n\007db_name\030\002 \001(\t\022\027\n\017collection_name\030\003 \001"
+  "(\t\022\026\n\016partition_name\030\004 \001(\t\"\204\001\n\024DropParti"
+  "tionRequest\022*\n\004base\030\001 \001(\0132\034.milvus.proto"
+  ".common.MsgBase\022\017\n\007db_name\030\002 \001(\t\022\027\n\017coll"
+  "ection_name\030\003 \001(\t\022\026\n\016partition_name\030\004 \001("
+  "\t\"\203\001\n\023HasPartitionRequest\022*\n\004base\030\001 \001(\0132"
+  "\034.milvus.proto.common.MsgBase\022\017\n\007db_name"
+  "\030\002 \001(\t\022\027\n\017collection_name\030\003 \001(\t\022\026\n\016parti"
+  "tion_name\030\004 \001(\t\"\206\001\n\025LoadPartitionsReques"
   "t\022*\n\004base\030\001 \001(\0132\034.milvus.proto.common.Ms"
   "gBase\022\017\n\007db_name\030\002 \001(\t\022\027\n\017collection_nam"
-  "e\030\003 \001(\t\022\027\n\017partition_names\030\004 \003(\t\"\215\001\n\035Get"
-  "PartitionStatisticsRequest\022*\n\004base\030\001 \001(\013"
-  "2\034.milvus.proto.common.MsgBase\022\017\n\007db_nam"
-  "e\030\002 \001(\t\022\027\n\017collection_name\030\003 \001(\t\022\026\n\016part"
-  "ition_name\030\004 \001(\t\"\177\n\036GetPartitionStatisti"
-  "csResponse\022+\n\006status\030\001 \001(\0132\033.milvus.prot"
-  "o.common.Status\0220\n\005stats\030\002 \003(\0132!.milvus."
-  "proto.common.KeyValuePair\"\311\001\n\025ShowPartit"
-  "ionsRequest\022*\n\004base\030\001 \001(\0132\034.milvus.proto"
-  ".common.MsgBase\022\017\n\007db_name\030\002 \001(\t\022\027\n\017coll"
-  "ection_name\030\003 \001(\t\022\024\n\014collectionID\030\004 \001(\003\022"
-  "\027\n\017partition_names\030\005 \003(\t\022+\n\004type\030\006 \001(\0162\035"
-  ".milvus.proto.milvus.ShowType\"\316\001\n\026ShowPa"
-  "rtitionsResponse\022+\n\006status\030\001 \001(\0132\033.milvu"
-  "s.proto.common.Status\022\027\n\017partition_names"
-  "\030\002 \003(\t\022\024\n\014partitionIDs\030\003 \003(\003\022\032\n\022created_"
-  "timestamps\030\004 \003(\004\022\036\n\026created_utc_timestam"
-  "ps\030\005 \003(\004\022\034\n\024inMemory_percentages\030\006 \003(\003\"m"
-  "\n\026DescribeSegmentRequest\022*\n\004base\030\001 \001(\0132\034"
-  ".milvus.proto.common.MsgBase\022\024\n\014collecti"
-  "onID\030\002 \001(\003\022\021\n\tsegmentID\030\003 \001(\003\"~\n\027Describ"
-  "eSegmentResponse\022+\n\006status\030\001 \001(\0132\033.milvu"
-  "s.proto.common.Status\022\017\n\007indexID\030\002 \001(\003\022\017"
-  "\n\007buildID\030\003 \001(\003\022\024\n\014enable_index\030\004 \001(\010\"l\n"
-  "\023ShowSegmentsRequest\022*\n\004base\030\001 \001(\0132\034.mil"
-  "vus.proto.common.MsgBase\022\024\n\014collectionID"
-  "\030\002 \001(\003\022\023\n\013partitionID\030\003 \001(\003\"W\n\024ShowSegme"
-  "ntsResponse\022+\n\006status\030\001 \001(\0132\033.milvus.pro"
-  "to.common.Status\022\022\n\nsegmentIDs\030\002 \003(\003\"\267\001\n"
-  "\022CreateIndexRequest\022*\n\004base\030\001 \001(\0132\034.milv"
-  "us.proto.common.MsgBase\022\017\n\007db_name\030\002 \001(\t"
-  "\022\027\n\017collection_name\030\003 \001(\t\022\022\n\nfield_name\030"
-  "\004 \001(\t\0227\n\014extra_params\030\005 \003(\0132!.milvus.pro"
-  "to.common.KeyValuePair\"\224\001\n\024DescribeIndex"
-  "Request\022*\n\004base\030\001 \001(\0132\034.milvus.proto.com"
-  "mon.MsgBase\022\017\n\007db_name\030\002 \001(\t\022\027\n\017collecti"
-  "on_name\030\003 \001(\t\022\022\n\nfield_name\030\004 \001(\t\022\022\n\nind"
-  "ex_name\030\005 \001(\t\"~\n\020IndexDescription\022\022\n\nind"
-  "ex_name\030\001 \001(\t\022\017\n\007indexID\030\002 \001(\003\0221\n\006params"
-  "\030\003 \003(\0132!.milvus.proto.common.KeyValuePai"
-  "r\022\022\n\nfield_name\030\004 \001(\t\"\207\001\n\025DescribeIndexR"
-  "esponse\022+\n\006status\030\001 \001(\0132\033.milvus.proto.c"
-  "ommon.Status\022A\n\022index_descriptions\030\002 \003(\013"
-  "2%.milvus.proto.milvus.IndexDescription\""
-  "\234\001\n\034GetIndexBuildProgressRequest\022*\n\004base"
-  "\030\001 \001(\0132\034.milvus.proto.common.MsgBase\022\017\n\007"
-  "db_name\030\002 \001(\t\022\027\n\017collection_name\030\003 \001(\t\022\022"
-  "\n\nfield_name\030\004 \001(\t\022\022\n\nindex_name\030\005 \001(\t\"v"
-  "\n\035GetIndexBuildProgressResponse\022+\n\006statu"
-  "s\030\001 \001(\0132\033.milvus.proto.common.Status\022\024\n\014"
-  "indexed_rows\030\002 \001(\003\022\022\n\ntotal_rows\030\003 \001(\003\"\224"
-  "\001\n\024GetIndexStateRequest\022*\n\004base\030\001 \001(\0132\034."
-  "milvus.proto.common.MsgBase\022\017\n\007db_name\030\002"
-  " \001(\t\022\027\n\017collection_name\030\003 \001(\t\022\022\n\nfield_n"
-  "ame\030\004 \001(\t\022\022\n\nindex_name\030\005 \001(\t\"\211\001\n\025GetInd"
-  "exStateResponse\022+\n\006status\030\001 \001(\0132\033.milvus"
-  ".proto.common.Status\022.\n\005state\030\002 \001(\0162\037.mi"
-  "lvus.proto.common.IndexState\022\023\n\013fail_rea"
-  "son\030\003 \001(\t\"\220\001\n\020DropIndexRequest\022*\n\004base\030\001"
-  " \001(\0132\034.milvus.proto.common.MsgBase\022\017\n\007db"
-  "_name\030\002 \001(\t\022\027\n\017collection_name\030\003 \001(\t\022\022\n\n"
-  "field_name\030\004 \001(\t\022\022\n\nindex_name\030\005 \001(\t\"\327\001\n"
-  "\rInsertRequest\022*\n\004base\030\001 \001(\0132\034.milvus.pr"
-  "oto.common.MsgBase\022\017\n\007db_name\030\002 \001(\t\022\027\n\017c"
-  "ollection_name\030\003 \001(\t\022\026\n\016partition_name\030\004"
-  " \001(\t\0223\n\013fields_data\030\005 \003(\0132\036.milvus.proto"
-  ".schema.FieldData\022\021\n\thash_keys\030\006 \003(\r\022\020\n\010"
-  "num_rows\030\007 \001(\r\"\360\001\n\016MutationResult\022+\n\006sta"
-  "tus\030\001 \001(\0132\033.milvus.proto.common.Status\022%"
-  "\n\003IDs\030\002 \001(\0132\030.milvus.proto.schema.IDs\022\022\n"
-  "\nsucc_index\030\003 \003(\r\022\021\n\terr_index\030\004 \003(\r\022\024\n\014"
-  "acknowledged\030\005 \001(\010\022\022\n\ninsert_cnt\030\006 \001(\003\022\022"
-  "\n\ndelete_cnt\030\007 \001(\003\022\022\n\nupsert_cnt\030\010 \001(\003\022\021"
-  "\n\ttimestamp\030\t \001(\004\"\213\001\n\rDeleteRequest\022*\n\004b"
-  "ase\030\001 \001(\0132\034.milvus.proto.common.MsgBase\022"
-  "\017\n\007db_name\030\002 \001(\t\022\027\n\017collection_name\030\003 \001("
-  "\t\022\026\n\016partition_name\030\004 \001(\t\022\014\n\004expr\030\005 \001(\t\""
-  "c\n\020PlaceholderValue\022\013\n\003tag\030\001 \001(\t\0222\n\004type"
-  "\030\002 \001(\0162$.milvus.proto.milvus.Placeholder"
-  "Type\022\016\n\006values\030\003 \003(\014\"O\n\020PlaceholderGroup"
-  "\022;\n\014placeholders\030\001 \003(\0132%.milvus.proto.mi"
-  "lvus.PlaceholderValue\"\336\002\n\rSearchRequest\022"
+  "e\030\003 \001(\t\022\027\n\017partition_names\030\004 \003(\t\"\211\001\n\030Rel"
+  "easePartitionsRequest\022*\n\004base\030\001 \001(\0132\034.mi"
+  "lvus.proto.common.MsgBase\022\017\n\007db_name\030\002 \001"
+  "(\t\022\027\n\017collection_name\030\003 \001(\t\022\027\n\017partition"
+  "_names\030\004 \003(\t\"\215\001\n\035GetPartitionStatisticsR"
+  "equest\022*\n\004base\030\001 \001(\0132\034.milvus.proto.comm"
+  "on.MsgBase\022\017\n\007db_name\030\002 \001(\t\022\027\n\017collectio"
+  "n_name\030\003 \001(\t\022\026\n\016partition_name\030\004 \001(\t\"\177\n\036"
+  "GetPartitionStatisticsResponse\022+\n\006status"
+  "\030\001 \001(\0132\033.milvus.proto.common.Status\0220\n\005s"
+  "tats\030\002 \003(\0132!.milvus.proto.common.KeyValu"
+  "ePair\"\311\001\n\025ShowPartitionsRequest\022*\n\004base\030"
+  "\001 \001(\0132\034.milvus.proto.common.MsgBase\022\017\n\007d"
+  "b_name\030\002 \001(\t\022\027\n\017collection_name\030\003 \001(\t\022\024\n"
+  "\014collectionID\030\004 \001(\003\022\027\n\017partition_names\030\005"
+  " \003(\t\022+\n\004type\030\006 \001(\0162\035.milvus.proto.milvus"
+  ".ShowType\"\316\001\n\026ShowPartitionsResponse\022+\n\006"
+  "status\030\001 \001(\0132\033.milvus.proto.common.Statu"
+  "s\022\027\n\017partition_names\030\002 \003(\t\022\024\n\014partitionI"
+  "Ds\030\003 \003(\003\022\032\n\022created_timestamps\030\004 \003(\004\022\036\n\026"
+  "created_utc_timestamps\030\005 \003(\004\022\034\n\024inMemory"
+  "_percentages\030\006 \003(\003\"m\n\026DescribeSegmentReq"
+  "uest\022*\n\004base\030\001 \001(\0132\034.milvus.proto.common"
+  ".MsgBase\022\024\n\014collectionID\030\002 \001(\003\022\021\n\tsegmen"
+  "tID\030\003 \001(\003\"~\n\027DescribeSegmentResponse\022+\n\006"
+  "status\030\001 \001(\0132\033.milvus.proto.common.Statu"
+  "s\022\017\n\007indexID\030\002 \001(\003\022\017\n\007buildID\030\003 \001(\003\022\024\n\014e"
+  "nable_index\030\004 \001(\010\"l\n\023ShowSegmentsRequest"
+  "\022*\n\004base\030\001 \001(\0132\034.milvus.proto.common.Msg"
+  "Base\022\024\n\014collectionID\030\002 \001(\003\022\023\n\013partitionI"
+  "D\030\003 \001(\003\"W\n\024ShowSegmentsResponse\022+\n\006statu"
+  "s\030\001 \001(\0132\033.milvus.proto.common.Status\022\022\n\n"
+  "segmentIDs\030\002 \003(\003\"\267\001\n\022CreateIndexRequest\022"
   "*\n\004base\030\001 \001(\0132\034.milvus.proto.common.MsgB"
   "ase\022\017\n\007db_name\030\002 \001(\t\022\027\n\017collection_name\030"
-  "\003 \001(\t\022\027\n\017partition_names\030\004 \003(\t\022\013\n\003dsl\030\005 "
-  "\001(\t\022\031\n\021placeholder_group\030\006 \001(\014\022.\n\010dsl_ty"
-  "pe\030\007 \001(\0162\034.milvus.proto.common.DslType\022\025"
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-  " \003(\0132!.milvus.proto.common.KeyValuePair\022"
-  "\030\n\020travel_timestamp\030\n \001(\004\022\033\n\023guarantee_t"
-  "imestamp\030\013 \001(\004\"5\n\004Hits\022\013\n\003IDs\030\001 \003(\003\022\020\n\010r"
-  "ow_data\030\002 \003(\014\022\016\n\006scores\030\003 \003(\002\"t\n\rSearchR"
-  "esults\022+\n\006status\030\001 \001(\0132\033.milvus.proto.co"
-  "mmon.Status\0226\n\007results\030\002 \001(\0132%.milvus.pr"
-  "oto.schema.SearchResultData\"e\n\014FlushRequ"
+  "\003 \001(\t\022\022\n\nfield_name\030\004 \001(\t\0227\n\014extra_param"
+  "s\030\005 \003(\0132!.milvus.proto.common.KeyValuePa"
+  "ir\"\224\001\n\024DescribeIndexRequest\022*\n\004base\030\001 \001("
+  "\0132\034.milvus.proto.common.MsgBase\022\017\n\007db_na"
+  "me\030\002 \001(\t\022\027\n\017collection_name\030\003 \001(\t\022\022\n\nfie"
+  "ld_name\030\004 \001(\t\022\022\n\nindex_name\030\005 \001(\t\"~\n\020Ind"
+  "exDescription\022\022\n\nindex_name\030\001 \001(\t\022\017\n\007ind"
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+  "*\n\004base\030\001 \001(\0132\034.milvus.proto.common.MsgB"
+  "ase\022\017\n\007request\030\002 \001(\t\"k\n\022GetMetricsRespon"
+  "se\022+\n\006status\030\001 \001(\0132\033.milvus.proto.common"
+  ".Status\022\020\n\010response\030\002 \001(\t\022\026\n\016component_n"
+  "ame\030\003 \001(\t*!\n\010ShowType\022\007\n\003All\020\000\022\014\n\010InMemo"
+  "ry\020\001*>\n\017PlaceholderType\022\010\n\004None\020\000\022\020\n\014Bin"
+  "aryVector\020d\022\017\n\013FloatVector\020e2\326\030\n\rMilvusS"
+  "ervice\022_\n\020CreateCollection\022,.milvus.prot"
+  "o.milvus.CreateCollectionRequest\032\033.milvu"
+  "s.proto.common.Status\"\000\022[\n\016DropCollectio"
+  "n\022*.milvus.proto.milvus.DropCollectionRe"
+  "quest\032\033.milvus.proto.common.Status\"\000\022_\n\r"
+  "HasCollection\022).milvus.proto.milvus.HasC"
+  "ollectionRequest\032!.milvus.proto.milvus.B"
+  "oolResponse\"\000\022[\n\016LoadCollection\022*.milvus"
+  ".proto.milvus.LoadCollectionRequest\032\033.mi"
+  "lvus.proto.common.Status\"\000\022a\n\021ReleaseCol"
+  "lection\022-.milvus.proto.milvus.ReleaseCol"
+  "lectionRequest\032\033.milvus.proto.common.Sta"
+  "tus\"\000\022w\n\022DescribeCollection\022..milvus.pro"
+  "to.milvus.DescribeCollectionRequest\032/.mi"
+  "lvus.proto.milvus.DescribeCollectionResp"
+  "onse\"\000\022\206\001\n\027GetCollectionStatistics\0223.mil"
+  "vus.proto.milvus.GetCollectionStatistics"
+  "Request\0324.milvus.proto.milvus.GetCollect"
+  "ionStatisticsResponse\"\000\022n\n\017ShowCollectio"
+  "ns\022+.milvus.proto.milvus.ShowCollections"
+  "Request\032,.milvus.proto.milvus.ShowCollec"
+  "tionsResponse\"\000\022]\n\017CreatePartition\022+.mil"
+  "vus.proto.milvus.CreatePartitionRequest\032"
+  "\033.milvus.proto.common.Status\"\000\022Y\n\rDropPa"
+  "rtition\022).milvus.proto.milvus.DropPartit"
+  "ionRequest\032\033.milvus.proto.common.Status\""
+  "\000\022]\n\014HasPartition\022(.milvus.proto.milvus."
+  "HasPartitionRequest\032!.milvus.proto.milvu"
+  "s.BoolResponse\"\000\022[\n\016LoadPartitions\022*.mil"
+  "vus.proto.milvus.LoadPartitionsRequest\032\033"
+  ".milvus.proto.common.Status\"\000\022a\n\021Release"
+  "Partitions\022-.milvus.proto.milvus.Release"
+  "PartitionsRequest\032\033.milvus.proto.common."
+  "Status\"\000\022\203\001\n\026GetPartitionStatistics\0222.mi"
+  "lvus.proto.milvus.GetPartitionStatistics"
+  "Request\0323.milvus.proto.milvus.GetPartiti"
+  "onStatisticsResponse\"\000\022k\n\016ShowPartitions"
+  "\022*.milvus.proto.milvus.ShowPartitionsReq"
+  "uest\032+.milvus.proto.milvus.ShowPartition"
+  "sResponse\"\000\022U\n\013CreateIndex\022\'.milvus.prot"
+  "o.milvus.CreateIndexRequest\032\033.milvus.pro"
+  "to.common.Status\"\000\022h\n\rDescribeIndex\022).mi"
+  "lvus.proto.milvus.DescribeIndexRequest\032*"
+  ".milvus.proto.milvus.DescribeIndexRespon"
+  "se\"\000\022h\n\rGetIndexState\022).milvus.proto.mil"
+  "vus.GetIndexStateRequest\032*.milvus.proto."
+  "milvus.GetIndexStateResponse\"\000\022\200\001\n\025GetIn"
+  "dexBuildProgress\0221.milvus.proto.milvus.G"
+  "etIndexBuildProgressRequest\0322.milvus.pro"
+  "to.milvus.GetIndexBuildProgressResponse\""
+  "\000\022Q\n\tDropIndex\022%.milvus.proto.milvus.Dro"
+  "pIndexRequest\032\033.milvus.proto.common.Stat"
+  "us\"\000\022S\n\006Insert\022\".milvus.proto.milvus.Ins"
+  "ertRequest\032#.milvus.proto.milvus.Mutatio"
+  "nResult\"\000\022S\n\006Delete\022\".milvus.proto.milvu"
+  "s.DeleteRequest\032#.milvus.proto.milvus.Mu"
+  "tationResult\"\000\022R\n\006Search\022\".milvus.proto."
+  "milvus.SearchRequest\032\".milvus.proto.milv"
+  "us.SearchResults\"\000\022P\n\005Flush\022!.milvus.pro"
+  "to.milvus.FlushRequest\032\".milvus.proto.mi"
+  "lvus.FlushResponse\"\000\022O\n\005Query\022!.milvus.p"
+  "roto.milvus.QueryRequest\032!.milvus.proto."
+  "milvus.QueryResults\"\000\022d\n\014CalcDistance\022(."
+  "milvus.proto.milvus.CalcDistanceRequest\032"
+  "(.milvus.proto.milvus.CalcDistanceResult"
+  "s\"\000\022\211\001\n\030GetPersistentSegmentInfo\0224.milvu"
+  "s.proto.milvus.GetPersistentSegmentInfoR"
+  "equest\0325.milvus.proto.milvus.GetPersiste"
+  "ntSegmentInfoResponse\"\000\022z\n\023GetQuerySegme"
+  "ntInfo\022/.milvus.proto.milvus.GetQuerySeg"
+  "mentInfoRequest\0320.milvus.proto.milvus.Ge"
+  "tQuerySegmentInfoResponse\"\000\022P\n\005Dummy\022!.m"
+  "ilvus.proto.milvus.DummyRequest\032\".milvus"
+  ".proto.milvus.DummyResponse\"\000\022e\n\014Registe"
+  "rLink\022(.milvus.proto.milvus.RegisterLink"
+  "Request\032).milvus.proto.milvus.RegisterLi"
+  "nkResponse\"\000\022_\n\nGetMetrics\022&.milvus.prot"
+  "o.milvus.GetMetricsRequest\032\'.milvus.prot"
+  "o.milvus.GetMetricsResponse\"\0002u\n\014ProxySe"
+  "rvice\022e\n\014RegisterLink\022(.milvus.proto.mil"
+  "vus.RegisterLinkRequest\032).milvus.proto.m"
+  "ilvus.RegisterLinkResponse\"\000B5Z3github.c"
+  "om/milvus-io/milvus/internal/proto/milvu"
+  "spbb\006proto3"
   ;
 static const ::PROTOBUF_NAMESPACE_ID::internal::DescriptorTable*const descriptor_table_milvus_2eproto_deps[2] = {
   &::descriptor_table_common_2eproto,
@@ -2359,7 +2361,7 @@ static ::PROTOBUF_NAMESPACE_ID::internal::SCCInfoBase*const descriptor_table_mil
 static ::PROTOBUF_NAMESPACE_ID::internal::once_flag descriptor_table_milvus_2eproto_once;
 static bool descriptor_table_milvus_2eproto_initialized = false;
 const ::PROTOBUF_NAMESPACE_ID::internal::DescriptorTable descriptor_table_milvus_2eproto = {
-  &descriptor_table_milvus_2eproto_initialized, descriptor_table_protodef_milvus_2eproto, "milvus.proto", 12351,
+  &descriptor_table_milvus_2eproto_initialized, descriptor_table_protodef_milvus_2eproto, "milvus.proto", 12371,
   &descriptor_table_milvus_2eproto_once, descriptor_table_milvus_2eproto_sccs, descriptor_table_milvus_2eproto_deps, 64, 2,
   schemas, file_default_instances, TableStruct_milvus_2eproto::offsets,
   file_level_metadata_milvus_2eproto, 64, file_level_enum_descriptors_milvus_2eproto, file_level_service_descriptors_milvus_2eproto,
@@ -4929,16 +4931,16 @@ DescribeCollectionResponse::DescribeCollectionResponse(const DescribeCollectionR
     schema_ = nullptr;
   }
   ::memcpy(&collectionid_, &from.collectionid_,
-    static_cast<size_t>(reinterpret_cast<char*>(&created_utc_timestamp_) -
-    reinterpret_cast<char*>(&collectionid_)) + sizeof(created_utc_timestamp_));
+    static_cast<size_t>(reinterpret_cast<char*>(&shards_num_) -
+    reinterpret_cast<char*>(&collectionid_)) + sizeof(shards_num_));
   // @@protoc_insertion_point(copy_constructor:milvus.proto.milvus.DescribeCollectionResponse)
 }
 
 void DescribeCollectionResponse::SharedCtor() {
   ::PROTOBUF_NAMESPACE_ID::internal::InitSCC(&scc_info_DescribeCollectionResponse_milvus_2eproto.base);
   ::memset(&status_, 0, static_cast<size_t>(
-      reinterpret_cast<char*>(&created_utc_timestamp_) -
-      reinterpret_cast<char*>(&status_)) + sizeof(created_utc_timestamp_));
+      reinterpret_cast<char*>(&shards_num_) -
+      reinterpret_cast<char*>(&status_)) + sizeof(shards_num_));
 }
 
 DescribeCollectionResponse::~DescribeCollectionResponse() {
@@ -4977,8 +4979,8 @@ void DescribeCollectionResponse::Clear() {
   }
   schema_ = nullptr;
   ::memset(&collectionid_, 0, static_cast<size_t>(
-      reinterpret_cast<char*>(&created_utc_timestamp_) -
-      reinterpret_cast<char*>(&collectionid_)) + sizeof(created_utc_timestamp_));
+      reinterpret_cast<char*>(&shards_num_) -
+      reinterpret_cast<char*>(&collectionid_)) + sizeof(shards_num_));
   _internal_metadata_.Clear();
 }
 
@@ -5049,6 +5051,13 @@ const char* DescribeCollectionResponse::_InternalParse(const char* ptr, ::PROTOB
           CHK_(ptr);
         } else goto handle_unusual;
         continue;
+      // int32 shards_num = 8;
+      case 8:
+        if (PROTOBUF_PREDICT_TRUE(static_cast<::PROTOBUF_NAMESPACE_ID::uint8>(tag) == 64)) {
+          shards_num_ = ::PROTOBUF_NAMESPACE_ID::internal::ReadVarint(&ptr);
+          CHK_(ptr);
+        } else goto handle_unusual;
+        continue;
       default: {
       handle_unusual:
         if ((tag & 7) == 4 || tag == 0) {
@@ -5172,6 +5181,19 @@ bool DescribeCollectionResponse::MergePartialFromCodedStream(
         break;
       }
 
+      // int32 shards_num = 8;
+      case 8: {
+        if (static_cast< ::PROTOBUF_NAMESPACE_ID::uint8>(tag) == (64 & 0xFF)) {
+
+          DO_((::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::ReadPrimitive<
+                   ::PROTOBUF_NAMESPACE_ID::int32, ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::TYPE_INT32>(
+                 input, &shards_num_)));
+        } else {
+          goto handle_unusual;
+        }
+        break;
+      }
+
       default: {
       handle_unusual:
         if (tag == 0) {
@@ -5246,6 +5268,11 @@ void DescribeCollectionResponse::SerializeWithCachedSizes(
     ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::WriteUInt64(7, this->created_utc_timestamp(), output);
   }
 
+  // int32 shards_num = 8;
+  if (this->shards_num() != 0) {
+    ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::WriteInt32(8, this->shards_num(), output);
+  }
+
   if (_internal_metadata_.have_unknown_fields()) {
     ::PROTOBUF_NAMESPACE_ID::internal::WireFormat::SerializeUnknownFields(
         _internal_metadata_.unknown_fields(), output);
@@ -5308,6 +5335,11 @@ void DescribeCollectionResponse::SerializeWithCachedSizes(
     target = ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::WriteUInt64ToArray(7, this->created_utc_timestamp(), target);
   }
 
+  // int32 shards_num = 8;
+  if (this->shards_num() != 0) {
+    target = ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::WriteInt32ToArray(8, this->shards_num(), target);
+  }
+
   if (_internal_metadata_.have_unknown_fields()) {
     target = ::PROTOBUF_NAMESPACE_ID::internal::WireFormat::SerializeUnknownFieldsToArray(
         _internal_metadata_.unknown_fields(), target);
@@ -5380,6 +5412,13 @@ size_t DescribeCollectionResponse::ByteSizeLong() const {
         this->created_utc_timestamp());
   }
 
+  // int32 shards_num = 8;
+  if (this->shards_num() != 0) {
+    total_size += 1 +
+      ::PROTOBUF_NAMESPACE_ID::internal::WireFormatLite::Int32Size(
+        this->shards_num());
+  }
+
   int cached_size = ::PROTOBUF_NAMESPACE_ID::internal::ToCachedSize(total_size);
   SetCachedSize(cached_size);
   return total_size;
@@ -5424,6 +5463,9 @@ void DescribeCollectionResponse::MergeFrom(const DescribeCollectionResponse& fro
   if (from.created_utc_timestamp() != 0) {
     set_created_utc_timestamp(from.created_utc_timestamp());
   }
+  if (from.shards_num() != 0) {
+    set_shards_num(from.shards_num());
+  }
 }
 
 void DescribeCollectionResponse::CopyFrom(const ::PROTOBUF_NAMESPACE_ID::Message& from) {
@@ -5454,6 +5496,7 @@ void DescribeCollectionResponse::InternalSwap(DescribeCollectionResponse* other)
   swap(collectionid_, other->collectionid_);
   swap(created_timestamp_, other->created_timestamp_);
   swap(created_utc_timestamp_, other->created_utc_timestamp_);
+  swap(shards_num_, other->shards_num_);
 }
 
 ::PROTOBUF_NAMESPACE_ID::Metadata DescribeCollectionResponse::GetMetadata() const {
diff --git a/internal/core/src/pb/milvus.pb.h b/internal/core/src/pb/milvus.pb.h
index 3af30e40ea..37c02be6e2 100644
--- a/internal/core/src/pb/milvus.pb.h
+++ b/internal/core/src/pb/milvus.pb.h
@@ -1470,6 +1470,7 @@ class DescribeCollectionResponse :
     kCollectionIDFieldNumber = 3,
     kCreatedTimestampFieldNumber = 6,
     kCreatedUtcTimestampFieldNumber = 7,
+    kShardsNumFieldNumber = 8,
   };
   // repeated string virtual_channel_names = 4;
   int virtual_channel_names_size() const;
@@ -1536,6 +1537,11 @@ class DescribeCollectionResponse :
   ::PROTOBUF_NAMESPACE_ID::uint64 created_utc_timestamp() const;
   void set_created_utc_timestamp(::PROTOBUF_NAMESPACE_ID::uint64 value);
 
+  // int32 shards_num = 8;
+  void clear_shards_num();
+  ::PROTOBUF_NAMESPACE_ID::int32 shards_num() const;
+  void set_shards_num(::PROTOBUF_NAMESPACE_ID::int32 value);
+
   // @@protoc_insertion_point(class_scope:milvus.proto.milvus.DescribeCollectionResponse)
  private:
   class _Internal;
@@ -1548,6 +1554,7 @@ class DescribeCollectionResponse :
   ::PROTOBUF_NAMESPACE_ID::int64 collectionid_;
   ::PROTOBUF_NAMESPACE_ID::uint64 created_timestamp_;
   ::PROTOBUF_NAMESPACE_ID::uint64 created_utc_timestamp_;
+  ::PROTOBUF_NAMESPACE_ID::int32 shards_num_;
   mutable ::PROTOBUF_NAMESPACE_ID::internal::CachedSize _cached_size_;
   friend struct ::TableStruct_milvus_2eproto;
 };
@@ -12146,6 +12153,20 @@ inline void DescribeCollectionResponse::set_created_utc_timestamp(::PROTOBUF_NAM
   // @@protoc_insertion_point(field_set:milvus.proto.milvus.DescribeCollectionResponse.created_utc_timestamp)
 }
 
+// int32 shards_num = 8;
+inline void DescribeCollectionResponse::clear_shards_num() {
+  shards_num_ = 0;
+}
+inline ::PROTOBUF_NAMESPACE_ID::int32 DescribeCollectionResponse::shards_num() const {
+  // @@protoc_insertion_point(field_get:milvus.proto.milvus.DescribeCollectionResponse.shards_num)
+  return shards_num_;
+}
+inline void DescribeCollectionResponse::set_shards_num(::PROTOBUF_NAMESPACE_ID::int32 value) {
+  
+  shards_num_ = value;
+  // @@protoc_insertion_point(field_set:milvus.proto.milvus.DescribeCollectionResponse.shards_num)
+}
+
 // -------------------------------------------------------------------
 
 // LoadCollectionRequest
diff --git a/internal/proto/etcd_meta.proto b/internal/proto/etcd_meta.proto
index 0bf2a82388..41cef3357c 100644
--- a/internal/proto/etcd_meta.proto
+++ b/internal/proto/etcd_meta.proto
@@ -39,6 +39,7 @@ message CollectionInfo {
   repeated string virtual_channel_names = 7;
   repeated string physical_channel_names = 8;
   repeated uint64 partition_created_timestamps = 9;
+  int32 shards_num = 10;
 }
 
 message SegmentIndexInfo {
diff --git a/internal/proto/etcdpb/etcd_meta.pb.go b/internal/proto/etcdpb/etcd_meta.pb.go
index 3a9a1bb107..f3e0d73106 100644
--- a/internal/proto/etcdpb/etcd_meta.pb.go
+++ b/internal/proto/etcdpb/etcd_meta.pb.go
@@ -252,6 +252,7 @@ type CollectionInfo struct {
 	VirtualChannelNames        []string                   `protobuf:"bytes,7,rep,name=virtual_channel_names,json=virtualChannelNames,proto3" json:"virtual_channel_names,omitempty"`
 	PhysicalChannelNames       []string                   `protobuf:"bytes,8,rep,name=physical_channel_names,json=physicalChannelNames,proto3" json:"physical_channel_names,omitempty"`
 	PartitionCreatedTimestamps []uint64                   `protobuf:"varint,9,rep,packed,name=partition_created_timestamps,json=partitionCreatedTimestamps,proto3" json:"partition_created_timestamps,omitempty"`
+	ShardsNum                  int32                      `protobuf:"varint,10,opt,name=shards_num,json=shardsNum,proto3" json:"shards_num,omitempty"`
 	XXX_NoUnkeyedLiteral       struct{}                   `json:"-"`
 	XXX_unrecognized           []byte                     `json:"-"`
 	XXX_sizecache              int32                      `json:"-"`
@@ -345,6 +346,13 @@ func (m *CollectionInfo) GetPartitionCreatedTimestamps() []uint64 {
 	return nil
 }
 
+func (m *CollectionInfo) GetShardsNum() int32 {
+	if m != nil {
+		return m.ShardsNum
+	}
+	return 0
+}
+
 type SegmentIndexInfo struct {
 	CollectionID         int64    `protobuf:"varint,1,opt,name=collectionID,proto3" json:"collectionID,omitempty"`
 	PartitionID          int64    `protobuf:"varint,2,opt,name=partitionID,proto3" json:"partitionID,omitempty"`
@@ -524,49 +532,50 @@ func init() {
 func init() { proto.RegisterFile("etcd_meta.proto", fileDescriptor_975d306d62b73e88) }
 
 var fileDescriptor_975d306d62b73e88 = []byte{
-	// 693 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xb4, 0x54, 0xcf, 0x6e, 0xd3, 0x4e,
-	0x10, 0x96, 0xeb, 0x34, 0xa9, 0x27, 0x69, 0xda, 0xee, 0xef, 0x8f, 0xac, 0xaa, 0x80, 0x6b, 0xa9,
-	0x25, 0x12, 0x22, 0x11, 0x2d, 0xe2, 0x86, 0x04, 0xd4, 0xaa, 0x14, 0x21, 0xaa, 0xe2, 0x46, 0x1c,
-	0xb8, 0x58, 0x1b, 0x7b, 0x92, 0xac, 0x64, 0xaf, 0x83, 0x77, 0x5d, 0x35, 0x37, 0xce, 0x3c, 0x02,
-	0x4f, 0xc3, 0xdb, 0x70, 0xe0, 0x25, 0x90, 0x77, 0x6d, 0x27, 0x69, 0xc3, 0x91, 0x9b, 0xe7, 0x9b,
-	0x99, 0xdd, 0x6f, 0xbe, 0xf9, 0xbc, 0xb0, 0x87, 0x32, 0x8c, 0x82, 0x04, 0x25, 0xed, 0xcf, 0xb3,
-	0x54, 0xa6, 0xe4, 0x20, 0x61, 0xf1, 0x6d, 0x2e, 0x74, 0xd4, 0x2f, 0xb2, 0x87, 0x9d, 0x30, 0x4d,
-	0x92, 0x94, 0x6b, 0xe8, 0xb0, 0x23, 0xc2, 0x19, 0x26, 0x65, 0xb9, 0xfb, 0xdd, 0x00, 0x18, 0x21,
-	0xa7, 0x5c, 0x7e, 0x40, 0x49, 0x49, 0x17, 0xb6, 0x86, 0x9e, 0x6d, 0x38, 0x46, 0xcf, 0xf4, 0xb7,
-	0x86, 0x1e, 0x39, 0x85, 0x3d, 0x9e, 0x27, 0xc1, 0x97, 0x1c, 0xb3, 0x45, 0xc0, 0xd3, 0x08, 0x85,
-	0xbd, 0xa5, 0x92, 0xbb, 0x3c, 0x4f, 0x3e, 0x16, 0xe8, 0x55, 0x01, 0x92, 0x67, 0x70, 0xc0, 0xb8,
-	0xc0, 0x4c, 0x06, 0xe1, 0x8c, 0x72, 0x8e, 0xf1, 0xd0, 0x13, 0xb6, 0xe9, 0x98, 0x3d, 0xcb, 0xdf,
-	0xd7, 0x89, 0x8b, 0x1a, 0x27, 0x4f, 0x61, 0x4f, 0x1f, 0x58, 0xd7, 0xda, 0x0d, 0xc7, 0xe8, 0x59,
-	0x7e, 0x57, 0xc1, 0x75, 0xa5, 0xfb, 0xd5, 0x00, 0xeb, 0x3a, 0x4b, 0xef, 0x16, 0x1b, 0xb9, 0xbd,
-	0x82, 0x16, 0x8d, 0xa2, 0x0c, 0x85, 0xe6, 0xd4, 0x3e, 0x3b, 0xea, 0xaf, 0xcd, 0x5e, 0x4e, 0xfd,
-	0x56, 0xd7, 0xf8, 0x55, 0x71, 0xc1, 0x35, 0x43, 0x91, 0xc7, 0x9b, 0xb8, 0xea, 0xc4, 0x92, 0xab,
-	0xfb, 0xcd, 0x00, 0x6b, 0xc8, 0x23, 0xbc, 0x1b, 0xf2, 0x49, 0x4a, 0x1e, 0x01, 0xb0, 0x22, 0x08,
-	0x38, 0x4d, 0x50, 0x51, 0xb1, 0x7c, 0x4b, 0x21, 0x57, 0x34, 0x41, 0x62, 0x43, 0x4b, 0x05, 0x43,
-	0xaf, 0x54, 0xa9, 0x0a, 0x89, 0x07, 0x1d, 0xdd, 0x38, 0xa7, 0x19, 0x4d, 0xf4, 0x75, 0xed, 0xb3,
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 }
diff --git a/internal/proto/milvus.proto b/internal/proto/milvus.proto
index 4833cbb27d..5daa09794e 100644
--- a/internal/proto/milvus.proto
+++ b/internal/proto/milvus.proto
@@ -97,6 +97,7 @@ message DescribeCollectionResponse {
   repeated string physical_channel_names = 5;
   uint64 created_timestamp = 6; // hybrid timestamp
   uint64 created_utc_timestamp = 7; // physical timestamp
+  int32 shards_num = 8; // shards number
 }
 
 message LoadCollectionRequest {
diff --git a/internal/proto/milvuspb/milvus.pb.go b/internal/proto/milvuspb/milvus.pb.go
index 2e21cf3984..35f6409516 100644
--- a/internal/proto/milvuspb/milvus.pb.go
+++ b/internal/proto/milvuspb/milvus.pb.go
@@ -442,6 +442,7 @@ type DescribeCollectionResponse struct {
 	PhysicalChannelNames []string                   `protobuf:"bytes,5,rep,name=physical_channel_names,json=physicalChannelNames,proto3" json:"physical_channel_names,omitempty"`
 	CreatedTimestamp     uint64                     `protobuf:"varint,6,opt,name=created_timestamp,json=createdTimestamp,proto3" json:"created_timestamp,omitempty"`
 	CreatedUtcTimestamp  uint64                     `protobuf:"varint,7,opt,name=created_utc_timestamp,json=createdUtcTimestamp,proto3" json:"created_utc_timestamp,omitempty"`
+	ShardsNum            int32                      `protobuf:"varint,8,opt,name=shards_num,json=shardsNum,proto3" json:"shards_num,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}                   `json:"-"`
 	XXX_unrecognized     []byte                     `json:"-"`
 	XXX_sizecache        int32                      `json:"-"`
@@ -521,6 +522,13 @@ func (m *DescribeCollectionResponse) GetCreatedUtcTimestamp() uint64 {
 	return 0
 }
 
+func (m *DescribeCollectionResponse) GetShardsNum() int32 {
+	if m != nil {
+		return m.ShardsNum
+	}
+	return 0
+}
+
 type LoadCollectionRequest struct {
 	Base                 *commonpb.MsgBase `protobuf:"bytes,1,opt,name=base,proto3" json:"base,omitempty"`
 	DbName               string            `protobuf:"bytes,2,opt,name=db_name,json=dbName,proto3" json:"db_name,omitempty"`
@@ -4079,196 +4087,197 @@ func init() {
 func init() { proto.RegisterFile("milvus.proto", fileDescriptor_02345ba45cc0e303) }
 
 var fileDescriptor_02345ba45cc0e303 = []byte{
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+	0x00, 0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
diff --git a/internal/proxy/paramtable.go b/internal/proxy/paramtable.go
index 185f303599..be32bd0175 100644
--- a/internal/proxy/paramtable.go
+++ b/internal/proxy/paramtable.go
@@ -56,6 +56,7 @@ type ParamTable struct {
 	MsgStreamTimeTickBufSize   int64
 	MaxNameLength              int64
 	MaxFieldNum                int64
+	MaxShardNum                int32
 	MaxDimension               int64
 	DefaultPartitionName       string
 	DefaultIndexName           string
@@ -91,6 +92,7 @@ func (pt *ParamTable) initParams() {
 	pt.initMsgStreamTimeTickBufSize()
 	pt.initMaxNameLength()
 	pt.initMaxFieldNum()
+	pt.initMaxShardNum()
 	pt.initMaxDimension()
 	pt.initDefaultPartitionName()
 	pt.initDefaultIndexName()
@@ -164,6 +166,18 @@ func (pt *ParamTable) initMaxNameLength() {
 	pt.MaxNameLength = maxNameLength
 }
 
+func (pt *ParamTable) initMaxShardNum() {
+	str, err := pt.Load("proxy.maxShardNum")
+	if err != nil {
+		panic(err)
+	}
+	maxShardNum, err := strconv.ParseInt(str, 10, 64)
+	if err != nil {
+		panic(err)
+	}
+	pt.MaxShardNum = int32(maxShardNum)
+}
+
 func (pt *ParamTable) initMaxFieldNum() {
 	str, err := pt.Load("proxy.maxFieldNum")
 	if err != nil {
diff --git a/internal/proxy/paramtable_test.go b/internal/proxy/paramtable_test.go
index a244ec9b8c..5656eb3013 100644
--- a/internal/proxy/paramtable_test.go
+++ b/internal/proxy/paramtable_test.go
@@ -11,9 +11,11 @@
 
 package proxy
 
-import "testing"
+import (
+	"testing"
+)
 
-func TestParamTable(t *testing.T) {
+func TestParamTable_Normal(t *testing.T) {
 	Params.Init()
 
 	t.Run("EtcdEndPoints", func(t *testing.T) {
@@ -56,6 +58,10 @@ func TestParamTable(t *testing.T) {
 		t.Logf("MaxFieldNum: %d", Params.MaxFieldNum)
 	})
 
+	t.Run("MaxShardNum", func(t *testing.T) {
+		t.Logf("MaxShardNum: %d", Params.MaxShardNum)
+	})
+
 	t.Run("MaxDimension", func(t *testing.T) {
 		t.Logf("MaxDimension: %d", Params.MaxDimension)
 	})
@@ -76,3 +82,71 @@ func TestParamTable(t *testing.T) {
 		t.Logf("RoleName: %s", Params.RoleName)
 	})
 }
+
+func shouldPanic(t *testing.T, name string, f func()) {
+	defer func() { recover() }()
+	f()
+	t.Errorf("%s should have panicked", name)
+}
+
+func TestParamTable_Panics(t *testing.T) {
+	shouldPanic(t, "proxy.timeTickInterval", func() {
+		Params.Remove("proxy.timeTickInterval")
+		Params.initTimeTickInterval()
+	})
+
+	shouldPanic(t, "proxy.timeTickInterval", func() {
+		Params.Save("proxy.timeTickInterval", "")
+		Params.initTimeTickInterval()
+	})
+
+	shouldPanic(t, "proxy.msgStream.timeTick.bufSize", func() {
+		Params.Remove("proxy.msgStream.timeTick.bufSize")
+		Params.initMsgStreamTimeTickBufSize()
+	})
+
+	shouldPanic(t, "proxy.msgStream.timeTick.bufSize", func() {
+		Params.Save("proxy.msgStream.timeTick.bufSize", "abc")
+		Params.initMsgStreamTimeTickBufSize()
+	})
+
+	shouldPanic(t, "proxy.maxNameLength", func() {
+		Params.Remove("proxy.maxNameLength")
+		Params.initMaxNameLength()
+	})
+
+	shouldPanic(t, "proxy.maxNameLength", func() {
+		Params.Save("proxy.maxNameLength", "abc")
+		Params.initMaxNameLength()
+	})
+
+	shouldPanic(t, "proxy.maxFieldNum", func() {
+		Params.Remove("proxy.maxFieldNum")
+		Params.initMaxFieldNum()
+	})
+
+	shouldPanic(t, "proxy.maxFieldNum", func() {
+		Params.Save("proxy.maxFieldNum", "abc")
+		Params.initMaxFieldNum()
+	})
+
+	shouldPanic(t, "proxy.maxShardNum", func() {
+		Params.Remove("proxy.maxShardNum")
+		Params.initMaxShardNum()
+	})
+
+	shouldPanic(t, "proxy.maxShardNum", func() {
+		Params.Save("proxy.maxShardNum", "abc")
+		Params.initMaxShardNum()
+	})
+
+	shouldPanic(t, "proxy.maxDimension", func() {
+		Params.Remove("proxy.maxDimension")
+		Params.initMaxDimension()
+	})
+
+	shouldPanic(t, "proxy.maxDimension", func() {
+		Params.Save("proxy.maxDimension", "-asdf")
+		Params.initMaxDimension()
+	})
+}
diff --git a/internal/proxy/task.go b/internal/proxy/task.go
index 61b9ca05b4..5b95f21ce7 100644
--- a/internal/proxy/task.go
+++ b/internal/proxy/task.go
@@ -1128,6 +1128,10 @@ func (cct *CreateCollectionTask) PreExecute(ctx context.Context) error {
 		return err
 	}
 
+	if cct.ShardsNum > Params.MaxShardNum {
+		return fmt.Errorf("maximum shards's number should be limited to %d", Params.MaxShardNum)
+	}
+
 	if int64(len(cct.schema.Fields)) > Params.MaxFieldNum {
 		return fmt.Errorf("maximum field's number should be limited to %d", Params.MaxFieldNum)
 	}
diff --git a/internal/rootcoord/root_coord.go b/internal/rootcoord/root_coord.go
index 2df5cccc07..679762746b 100644
--- a/internal/rootcoord/root_coord.go
+++ b/internal/rootcoord/root_coord.go
@@ -65,6 +65,8 @@ const (
 
 	// MetricRequestsSuccess used to count the num of successful requests
 	MetricRequestsSuccess = "success"
+
+	DefaultShardsNum = int32(2)
 )
 
 func metricProxy(v int64) string {
diff --git a/internal/rootcoord/root_coord_test.go b/internal/rootcoord/root_coord_test.go
index ecf35a9529..67e0ee5589 100644
--- a/internal/rootcoord/root_coord_test.go
+++ b/internal/rootcoord/root_coord_test.go
@@ -257,6 +257,139 @@ func getNotTtMsg(ctx context.Context, n int, ch <-chan *msgstream.MsgPack) []msg
 	}
 }
 
+func createCollectionInMeta(dbName, collName string, core *Core, shardsNum int32, modifyFunc func(*etcdpb.CollectionInfo)) error {
+	schema := schemapb.CollectionSchema{
+		Name: collName,
+	}
+
+	sbf, err := proto.Marshal(&schema)
+
+	t := &milvuspb.CreateCollectionRequest{
+		Base: &commonpb.MsgBase{
+			MsgType:   commonpb.MsgType_CreateCollection,
+			Timestamp: 100,
+		},
+		DbName:         dbName,
+		CollectionName: collName,
+		Schema:         sbf,
+		ShardsNum:      shardsNum,
+	}
+
+	err = proto.Unmarshal(t.Schema, &schema)
+	if err != nil {
+		return fmt.Errorf("unmarshal schema error= %w", err)
+	}
+
+	for idx, field := range schema.Fields {
+		field.FieldID = int64(idx + StartOfUserFieldID)
+	}
+	rowIDField := &schemapb.FieldSchema{
+		FieldID:      int64(RowIDField),
+		Name:         RowIDFieldName,
+		IsPrimaryKey: false,
+		Description:  "row id",
+		DataType:     schemapb.DataType_Int64,
+	}
+	timeStampField := &schemapb.FieldSchema{
+		FieldID:      int64(TimeStampField),
+		Name:         TimeStampFieldName,
+		IsPrimaryKey: false,
+		Description:  "time stamp",
+		DataType:     schemapb.DataType_Int64,
+	}
+	schema.Fields = append(schema.Fields, rowIDField, timeStampField)
+
+	collID, _, err := core.IDAllocator(1)
+	if err != nil {
+		return fmt.Errorf("alloc collection id error = %w", err)
+	}
+	partID, _, err := core.IDAllocator(1)
+	if err != nil {
+		return fmt.Errorf("alloc partition id error = %w", err)
+	}
+
+	vchanNames := make([]string, t.ShardsNum)
+	chanNames := make([]string, t.ShardsNum)
+	for i := int32(0); i < t.ShardsNum; i++ {
+		vchanNames[i] = fmt.Sprintf("%s_%dv%d", core.dmlChannels.GetDmlMsgStreamName(), collID, i)
+		chanNames[i] = ToPhysicalChannel(vchanNames[i])
+	}
+
+	collInfo := etcdpb.CollectionInfo{
+		ID:                         collID,
+		Schema:                     &schema,
+		PartitionIDs:               []typeutil.UniqueID{partID},
+		PartitionNames:             []string{Params.DefaultPartitionName},
+		FieldIndexes:               make([]*etcdpb.FieldIndexInfo, 0, 16),
+		VirtualChannelNames:        vchanNames,
+		PhysicalChannelNames:       chanNames,
+		ShardsNum:                  0, // intend to set zero
+		PartitionCreatedTimestamps: []uint64{0},
+	}
+
+	if modifyFunc != nil {
+		modifyFunc(&collInfo)
+	}
+
+	idxInfo := make([]*etcdpb.IndexInfo, 0, 16)
+
+	// schema is modified (add RowIDField and TimestampField),
+	// so need Marshal again
+	schemaBytes, err := proto.Marshal(&schema)
+	if err != nil {
+		return fmt.Errorf("marshal schema error = %w", err)
+	}
+
+	ddCollReq := internalpb.CreateCollectionRequest{
+		Base:                 t.Base,
+		DbName:               t.DbName,
+		CollectionName:       t.CollectionName,
+		PartitionName:        Params.DefaultPartitionName,
+		DbID:                 0, //TODO,not used
+		CollectionID:         collID,
+		PartitionID:          partID,
+		Schema:               schemaBytes,
+		VirtualChannelNames:  vchanNames,
+		PhysicalChannelNames: chanNames,
+	}
+
+	// build DdOperation and save it into etcd, when ddmsg send fail,
+	// system can restore ddmsg from etcd and re-send
+	ddOp := func(ts typeutil.Timestamp) (string, error) {
+		ddCollReq.Base.Timestamp = ts
+		return EncodeDdOperation(&ddCollReq, CreateCollectionDDType)
+	}
+
+	reason := fmt.Sprintf("create collection %d", collID)
+	ts, err := core.TSOAllocator(1)
+	if err != nil {
+		return fmt.Errorf("TSO alloc fail, error = %w", err)
+	}
+
+	// use lambda function here to guarantee all resources to be released
+	createCollectionFn := func() error {
+		// lock for ddl operation
+		core.ddlLock.Lock()
+		defer core.ddlLock.Unlock()
+
+		core.chanTimeTick.AddDdlTimeTick(ts, reason)
+		// clear ddl timetick in all conditions
+		defer core.chanTimeTick.RemoveDdlTimeTick(ts, reason)
+
+		err = core.MetaTable.AddCollection(&collInfo, ts, idxInfo, ddOp)
+		if err != nil {
+			return fmt.Errorf("meta table add collection failed,error = %w", err)
+		}
+		return nil
+	}
+
+	err = createCollectionFn()
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
 func TestRootCoord(t *testing.T) {
 	const (
 		dbName   = "testDb"
@@ -279,7 +412,7 @@ func TestRootCoord(t *testing.T) {
 	Params.MetaRootPath = fmt.Sprintf("/%d/%s", randVal, Params.MetaRootPath)
 	Params.KvRootPath = fmt.Sprintf("/%d/%s", randVal, Params.KvRootPath)
 	Params.MsgChannelSubName = fmt.Sprintf("subname-%d", randVal)
-	Params.DmlChannelName = fmt.Sprintf("dml-%d", randVal)
+	Params.DmlChannelName = fmt.Sprintf("rootcoord-dml-test-%d", randVal)
 
 	err = core.Register()
 	assert.Nil(t, err)
@@ -345,6 +478,7 @@ func TestRootCoord(t *testing.T) {
 	timeTickStream.Start()
 
 	dmlStream, _ := tmpFactory.NewMsgStream(ctx)
+	clearMsgChan(1500*time.Millisecond, dmlStream.Chan())
 
 	err = core.Init()
 	assert.Nil(t, err)
@@ -362,6 +496,7 @@ func TestRootCoord(t *testing.T) {
 	assert.Nil(t, err)
 
 	time.Sleep(100 * time.Millisecond)
+	shardsNum := int32(8)
 
 	t.Run("time tick", func(t *testing.T) {
 		ttmsg, ok := <-timeTickStream.Chan()
@@ -404,7 +539,6 @@ func TestRootCoord(t *testing.T) {
 		}
 		sbf, err := proto.Marshal(&schema)
 		assert.Nil(t, err)
-
 		req := &milvuspb.CreateCollectionRequest{
 			Base: &commonpb.MsgBase{
 				MsgType:   commonpb.MsgType_CreateCollection,
@@ -415,12 +549,13 @@ func TestRootCoord(t *testing.T) {
 			DbName:         dbName,
 			CollectionName: collName,
 			Schema:         sbf,
+			ShardsNum:      shardsNum,
 		}
 		status, err := core.CreateCollection(ctx, req)
 		assert.Nil(t, err)
 		assert.Equal(t, commonpb.ErrorCode_Success, status.ErrorCode)
 
-		assert.Equal(t, 2, core.dmlChannels.GetNumChannels())
+		assert.Equal(t, shardsNum, int32(core.dmlChannels.GetNumChannels()))
 
 		pChan := core.MetaTable.ListCollectionPhysicalChannels()
 		dmlStream.AsConsumer([]string{pChan[0]}, Params.MsgChannelSubName)
@@ -438,8 +573,9 @@ func TestRootCoord(t *testing.T) {
 		assert.Equal(t, createMeta.PartitionIDs[0], createMsg.PartitionID)
 		assert.Equal(t, 1, len(createMeta.PartitionNames))
 		assert.Equal(t, createMeta.PartitionNames[0], createMsg.PartitionName)
-		assert.Equal(t, 2, len(createMeta.VirtualChannelNames))
-		assert.Equal(t, 2, len(createMeta.PhysicalChannelNames))
+		assert.Equal(t, shardsNum, int32(len(createMeta.VirtualChannelNames)))
+		assert.Equal(t, shardsNum, int32(len(createMeta.PhysicalChannelNames)))
+		assert.Equal(t, shardsNum, createMeta.ShardsNum)
 
 		vChanName := createMeta.VirtualChannelNames[0]
 		assert.Equal(t, createMeta.PhysicalChannelNames[0], ToPhysicalChannel(vChanName))
@@ -455,9 +591,9 @@ func TestRootCoord(t *testing.T) {
 		assert.Equal(t, len(core.chanTimeTick.proxyTimeTick), 2)
 		pt, ok := core.chanTimeTick.proxyTimeTick[core.session.ServerID]
 		assert.True(t, ok)
-		assert.Equal(t, 2, len(pt.in.ChannelNames))
-		assert.Equal(t, 2, len(pt.in.Timestamps))
-		assert.Equal(t, 2, len(pt.timeTick))
+		assert.Equal(t, shardsNum, int32(len(pt.in.ChannelNames)))
+		assert.Equal(t, shardsNum, int32(len(pt.in.Timestamps)))
+		assert.Equal(t, shardsNum, int32(len(pt.timeTick)))
 		assert.ElementsMatch(t, pt.in.ChannelNames, createMeta.PhysicalChannelNames)
 		assert.Equal(t, pt.in.Timestamps[0], pt.in.Timestamps[1])
 		assert.Equal(t, pt.in.Timestamps[0], pt.in.DefaultTimestamp)
@@ -580,8 +716,9 @@ func TestRootCoord(t *testing.T) {
 		assert.Equal(t, commonpb.ErrorCode_Success, rsp.Status.ErrorCode)
 		assert.Equal(t, collName, rsp.Schema.Name)
 		assert.Equal(t, collMeta.ID, rsp.CollectionID)
-		assert.Equal(t, 2, len(rsp.VirtualChannelNames))
-		assert.Equal(t, 2, len(rsp.PhysicalChannelNames))
+		assert.Equal(t, shardsNum, int32(len(rsp.VirtualChannelNames)))
+		assert.Equal(t, shardsNum, int32(len(rsp.PhysicalChannelNames)))
+		assert.Equal(t, shardsNum, rsp.ShardsNum)
 	})
 
 	t.Run("show collection", func(t *testing.T) {
@@ -1881,6 +2018,29 @@ func TestRootCoord2(t *testing.T) {
 		assert.True(t, ok)
 		t.Log("time tick", m1.Base.Timestamp)
 	})
+
+	t.Run("describe collection", func(t *testing.T) {
+		collMeta, err := core.MetaTable.GetCollectionByName(collName, 0)
+		assert.Nil(t, err)
+		req := &milvuspb.DescribeCollectionRequest{
+			Base: &commonpb.MsgBase{
+				MsgType:   commonpb.MsgType_DescribeCollection,
+				MsgID:     120,
+				Timestamp: 120,
+				SourceID:  120,
+			},
+			DbName:         dbName,
+			CollectionName: collName,
+		}
+		rsp, err := core.DescribeCollection(ctx, req)
+		assert.Nil(t, err)
+		assert.Equal(t, commonpb.ErrorCode_Success, rsp.Status.ErrorCode)
+		assert.Equal(t, collName, rsp.Schema.Name)
+		assert.Equal(t, collMeta.ID, rsp.CollectionID)
+		assert.Equal(t, DefaultShardsNum, int32(len(rsp.VirtualChannelNames)))
+		assert.Equal(t, DefaultShardsNum, int32(len(rsp.PhysicalChannelNames)))
+		assert.Equal(t, DefaultShardsNum, rsp.ShardsNum)
+	})
 }
 
 func TestCheckInit(t *testing.T) {
@@ -2155,3 +2315,102 @@ func TestCheckFlushedSegments(t *testing.T) {
 	})
 
 }
+
+func TestRootCoord_CheckZeroShardsNum(t *testing.T) {
+	const (
+		dbName   = "testDb"
+		collName = "testColl"
+	)
+
+	shardsNum := int32(2)
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	msFactory := msgstream.NewPmsFactory()
+	Params.Init()
+	core, err := NewCore(ctx, msFactory)
+	assert.Nil(t, err)
+	randVal := rand.Int()
+
+	Params.TimeTickChannel = fmt.Sprintf("rootcoord-time-tick-%d", randVal)
+	Params.StatisticsChannel = fmt.Sprintf("rootcoord-statistics-%d", randVal)
+	Params.MetaRootPath = fmt.Sprintf("/%d/%s", randVal, Params.MetaRootPath)
+	Params.KvRootPath = fmt.Sprintf("/%d/%s", randVal, Params.KvRootPath)
+	Params.MsgChannelSubName = fmt.Sprintf("subname-%d", randVal)
+
+	err = core.Register()
+	assert.Nil(t, err)
+
+	dm := &dataMock{randVal: randVal}
+	err = core.SetDataCoord(ctx, dm)
+	assert.Nil(t, err)
+
+	im := &indexMock{
+		fileArray:  []string{},
+		idxBuildID: []int64{},
+		idxID:      []int64{},
+		idxDropID:  []int64{},
+		mutex:      sync.Mutex{},
+	}
+	err = core.SetIndexCoord(im)
+	assert.Nil(t, err)
+
+	qm := &queryMock{
+		collID: nil,
+		mutex:  sync.Mutex{},
+	}
+	err = core.SetQueryCoord(qm)
+	assert.Nil(t, err)
+
+	core.NewProxyClient = func(*sessionutil.Session) (types.Proxy, error) {
+		return nil, nil
+	}
+
+	err = core.Init()
+	assert.Nil(t, err)
+
+	err = core.Start()
+	assert.Nil(t, err)
+
+	m := map[string]interface{}{
+		"receiveBufSize": 1024,
+		"pulsarAddress":  Params.PulsarAddress,
+		"pulsarBufSize":  1024}
+	err = msFactory.SetParams(m)
+	assert.Nil(t, err)
+
+	timeTickStream, _ := msFactory.NewMsgStream(ctx)
+	timeTickStream.AsConsumer([]string{Params.TimeTickChannel}, Params.MsgChannelSubName)
+	timeTickStream.Start()
+
+	time.Sleep(100 * time.Millisecond)
+
+	modifyFunc := func(collInfo *etcdpb.CollectionInfo) {
+		collInfo.ShardsNum = 0
+	}
+
+	createCollectionInMeta(dbName, collName, core, shardsNum, modifyFunc)
+
+	t.Run("describe collection", func(t *testing.T) {
+		collMeta, err := core.MetaTable.GetCollectionByName(collName, 0)
+		assert.Nil(t, err)
+		req := &milvuspb.DescribeCollectionRequest{
+			Base: &commonpb.MsgBase{
+				MsgType:   commonpb.MsgType_DescribeCollection,
+				MsgID:     120,
+				Timestamp: 120,
+				SourceID:  120,
+			},
+			DbName:         dbName,
+			CollectionName: collName,
+		}
+		rsp, err := core.DescribeCollection(ctx, req)
+		assert.Nil(t, err)
+		assert.Equal(t, commonpb.ErrorCode_Success, rsp.Status.ErrorCode)
+		assert.Equal(t, collName, rsp.Schema.Name)
+		assert.Equal(t, collMeta.ID, rsp.CollectionID)
+		assert.Equal(t, shardsNum, int32(len(rsp.VirtualChannelNames)))
+		assert.Equal(t, shardsNum, int32(len(rsp.PhysicalChannelNames)))
+		assert.Equal(t, shardsNum, rsp.ShardsNum)
+	})
+}
diff --git a/internal/rootcoord/task.go b/internal/rootcoord/task.go
index ad3df0e581..ce19c198a0 100644
--- a/internal/rootcoord/task.go
+++ b/internal/rootcoord/task.go
@@ -79,8 +79,6 @@ func (t *CreateCollectionReqTask) Type() commonpb.MsgType {
 }
 
 func (t *CreateCollectionReqTask) Execute(ctx context.Context) error {
-	const defaultShardsNum = 2
-
 	if t.Type() != commonpb.MsgType_CreateCollection {
 		return fmt.Errorf("create collection, msg type = %s", commonpb.MsgType_name[int32(t.Type())])
 	}
@@ -93,12 +91,11 @@ func (t *CreateCollectionReqTask) Execute(ctx context.Context) error {
 	if t.Req.CollectionName != schema.Name {
 		return fmt.Errorf("collection name = %s, schema.Name=%s", t.Req.CollectionName, schema.Name)
 	}
-
 	if t.Req.ShardsNum <= 0 {
-		log.Debug("Set ShardsNum to default", zap.String("collection name", t.Req.CollectionName),
-			zap.Int32("defaultShardsNum", defaultShardsNum))
-		t.Req.ShardsNum = defaultShardsNum
+		t.Req.ShardsNum = DefaultShardsNum
 	}
+	log.Debug("CreateCollectionReqTask Execute", zap.Any("CollectionName", t.Req.CollectionName),
+		zap.Any("ShardsNum", t.Req.ShardsNum))
 
 	for idx, field := range schema.Fields {
 		field.FieldID = int64(idx + StartOfUserFieldID)
@@ -136,7 +133,7 @@ func (t *CreateCollectionReqTask) Execute(ctx context.Context) error {
 	vchanNames := make([]string, t.Req.ShardsNum)
 	chanNames := make([]string, t.Req.ShardsNum)
 	for i := int32(0); i < t.Req.ShardsNum; i++ {
-		vchanNames[i] = fmt.Sprintf("%s_%dv", t.core.dmlChannels.GetDmlMsgStreamName(), collID)
+		vchanNames[i] = fmt.Sprintf("%s_%dv%d", t.core.dmlChannels.GetDmlMsgStreamName(), collID, i)
 		chanNames[i] = ToPhysicalChannel(vchanNames[i])
 	}
 
@@ -148,6 +145,7 @@ func (t *CreateCollectionReqTask) Execute(ctx context.Context) error {
 		FieldIndexes:               make([]*etcdpb.FieldIndexInfo, 0, 16),
 		VirtualChannelNames:        vchanNames,
 		PhysicalChannelNames:       chanNames,
+		ShardsNum:                  t.Req.ShardsNum,
 		PartitionCreatedTimestamps: []uint64{0},
 	}
 
@@ -376,16 +374,12 @@ func (t *DescribeCollectionReqTask) Execute(ctx context.Context) error {
 
 	t.Rsp.Schema = proto.Clone(collInfo.Schema).(*schemapb.CollectionSchema)
 	t.Rsp.CollectionID = collInfo.ID
-	//var newField []*schemapb.FieldSchema
-	//for _, field := range t.Rsp.Schema.Fields {
-	//	if field.FieldID >= StartOfUserFieldID {
-	//		newField = append(newField, field)
-	//	}
-	//}
-	//t.Rsp.Schema.Fields = newField
-
 	t.Rsp.VirtualChannelNames = collInfo.VirtualChannelNames
 	t.Rsp.PhysicalChannelNames = collInfo.PhysicalChannelNames
+	if collInfo.ShardsNum == 0 {
+		collInfo.ShardsNum = int32(len(collInfo.VirtualChannelNames))
+	}
+	t.Rsp.ShardsNum = collInfo.ShardsNum
 
 	t.Rsp.CreatedTimestamp = collInfo.CreateTime
 	createdPhysicalTime, _ := tsoutil.ParseHybridTs(collInfo.CreateTime)