Add GetShardLeaders rpc in querycoord proto (#16299)

See also: #16298

Signed-off-by: yangxuan <xuan.yang@zilliz.com>

internal/distributed/proxy/service_test.go

@@ -360,6 +360,10 @@ func (m *MockQueryCoord) GetMetrics(ctx context.Context, req *milvuspb.GetMetric
 	return nil, nil
 }
 
+func (m *MockQueryCoord) GetShardLeaders(ctx context.Context, req *querypb.GetShardLeadersRequest) (*querypb.GetShardLeadersResponse, error) {
+	return nil, nil
+}
+
 ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 type MockDataCoord struct {
 	MockBase

internal/distributed/querycoord/client/client.go

@@ -300,3 +300,17 @@ func (c *Client) GetMetrics(ctx context.Context, req *milvuspb.GetMetricsRequest
 	}
 	return ret.(*milvuspb.GetMetricsResponse), err
 }
+
+// GetShardLeaders gets the shard leaders of a certain collection.
+func (c *Client) GetShardLeaders(ctx context.Context, req *querypb.GetShardLeadersRequest) (*querypb.GetShardLeadersResponse, error) {
+	ret, err := c.grpcClient.ReCall(ctx, func(client interface{}) (interface{}, error) {
+		if !funcutil.CheckCtxValid(ctx) {
+			return nil, ctx.Err()
+		}
+		return client.(querypb.QueryCoordClient).GetShardLeaders(ctx, req)
+	})
+	if err != nil || ret == nil {
+		return nil, err
+	}
+	return ret.(*querypb.GetShardLeadersResponse), err
+}

internal/distributed/querycoord/client/client_test.go

@@ -107,6 +107,9 @@ func Test_NewClient(t *testing.T) {
 
 		r16, err := client.LoadBalance(ctx, nil)
 		retCheck(retNotNil, r16, err)
+
+		r17, err := client.GetShardLeaders(ctx, nil)
+		retCheck(retNotNil, r17, err)
 	}
 
 	client.grpcClient = &mock.ClientBase{

internal/distributed/querycoord/service.go

@@ -389,3 +389,8 @@ func (s *Server) LoadBalance(ctx context.Context, req *querypb.LoadBalanceReques
 func (s *Server) GetMetrics(ctx context.Context, req *milvuspb.GetMetricsRequest) (*milvuspb.GetMetricsResponse, error) {
 	return s.queryCoord.GetMetrics(ctx, req)
 }
+
+// GetShardLeaders returns the shard leaders of a certain collection.
+func (s *Server) GetShardLeaders(ctx context.Context, req *querypb.GetShardLeadersRequest) (*querypb.GetShardLeadersResponse, error) {
+	return s.queryCoord.GetShardLeaders(ctx, req)
+}

internal/distributed/querycoord/service_test.go

@@ -34,20 +34,21 @@ import (
 
 ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 type MockQueryCoord struct {
-	states       *internalpb.ComponentStates
-	status       *commonpb.Status
-	err          error
-	initErr      error
-	startErr     error
-	stopErr      error
-	regErr       error
-	strResp      *milvuspb.StringResponse
-	showcolResp  *querypb.ShowCollectionsResponse
-	showpartResp *querypb.ShowPartitionsResponse
-	partResp     *querypb.GetPartitionStatesResponse
-	channelResp  *querypb.CreateQueryChannelResponse
-	infoResp     *querypb.GetSegmentInfoResponse
-	metricResp   *milvuspb.GetMetricsResponse
+	states           *internalpb.ComponentStates
+	status           *commonpb.Status
+	err              error
+	initErr          error
+	startErr         error
+	stopErr          error
+	regErr           error
+	strResp          *milvuspb.StringResponse
+	showcolResp      *querypb.ShowCollectionsResponse
+	showpartResp     *querypb.ShowPartitionsResponse
+	partResp         *querypb.GetPartitionStatesResponse
+	channelResp      *querypb.CreateQueryChannelResponse
+	infoResp         *querypb.GetSegmentInfoResponse
+	metricResp       *milvuspb.GetMetricsResponse
+	shardLeadersResp *querypb.GetShardLeadersResponse
 }
 
 func (m *MockQueryCoord) Init() error {
@@ -142,6 +143,10 @@ func (m *MockQueryCoord) GetMetrics(ctx context.Context, req *milvuspb.GetMetric
 	return m.metricResp, m.err
 }
 
+func (m *MockQueryCoord) GetShardLeaders(ctx context.Context, req *querypb.GetShardLeadersRequest) (*querypb.GetShardLeadersResponse, error) {
+	return m.shardLeadersResp, m.err
+}
+
 ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 type MockRootCoord struct {
 	types.RootCoord

internal/proto/query_coord.proto

@@ -30,6 +30,9 @@ service QueryCoord {
 
   // https://wiki.lfaidata.foundation/display/MIL/MEP+8+--+Add+metrics+for+proxy
   rpc GetMetrics(milvus.GetMetricsRequest) returns (milvus.GetMetricsResponse) {}
+
+  // https://wiki.lfaidata.foundation/display/MIL/MEP+23+--+Multiple+memory+replication+design
+  rpc GetShardLeaders(GetShardLeadersRequest) returns (GetShardLeadersResponse) {}
 }
 
 service QueryNode {
@@ -147,6 +150,22 @@ message GetSegmentInfoResponse {
   repeated SegmentInfo infos = 2;
 }
 
+message GetShardLeadersRequest {
+  common.MsgBase base = 1;
+  int64 collectionID = 2;
+}
+
+message GetShardLeadersResponse {
+  common.Status status= 1 ;
+  repeated ShardLeaderList list = 2;
+}
+
+message ShardLeaderList {
+  string channel_name = 1;
+  int64 nodeID = 2;
+  string address = 3; // 127.0.0.1:9000
+}
+
 //-----------------query node grpc request and response proto----------------
 message AddQueryChannelRequest {
   common.MsgBase base = 1;
@@ -169,7 +188,7 @@ message RemoveQueryChannelRequest {
 message LoadMetaInfo {
   LoadType load_type = 1;
   int64 collectionID = 2;
-  repeated int64 partitionIDs = 3;  
+  repeated int64 partitionIDs = 3;
 }
 
 message WatchDmChannelsRequest {

internal/proto/querypb/query_coord.pb.go

@@ -960,6 +960,155 @@ func (m *GetSegmentInfoResponse) GetInfos() []*SegmentInfo {
 	return nil
 }
 
+type GetShardLeadersRequest struct {
+	Base                 *commonpb.MsgBase `protobuf:"bytes,1,opt,name=base,proto3" json:"base,omitempty"`
+	CollectionID         int64             `protobuf:"varint,2,opt,name=collectionID,proto3" json:"collectionID,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}          `json:"-"`
+	XXX_unrecognized     []byte            `json:"-"`
+	XXX_sizecache        int32             `json:"-"`
+}
+
+func (m *GetShardLeadersRequest) Reset()         { *m = GetShardLeadersRequest{} }
+func (m *GetShardLeadersRequest) String() string { return proto.CompactTextString(m) }
+func (*GetShardLeadersRequest) ProtoMessage()    {}
+func (*GetShardLeadersRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_aab7cc9a69ed26e8, []int{14}
+}
+
+func (m *GetShardLeadersRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_GetShardLeadersRequest.Unmarshal(m, b)
+}
+func (m *GetShardLeadersRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_GetShardLeadersRequest.Marshal(b, m, deterministic)
+}
+func (m *GetShardLeadersRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_GetShardLeadersRequest.Merge(m, src)
+}
+func (m *GetShardLeadersRequest) XXX_Size() int {
+	return xxx_messageInfo_GetShardLeadersRequest.Size(m)
+}
+func (m *GetShardLeadersRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_GetShardLeadersRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_GetShardLeadersRequest proto.InternalMessageInfo
+
+func (m *GetShardLeadersRequest) GetBase() *commonpb.MsgBase {
+	if m != nil {
+		return m.Base
+	}
+	return nil
+}
+
+func (m *GetShardLeadersRequest) GetCollectionID() int64 {
+	if m != nil {
+		return m.CollectionID
+	}
+	return 0
+}
+
+type GetShardLeadersResponse struct {
+	Status               *commonpb.Status   `protobuf:"bytes,1,opt,name=status,proto3" json:"status,omitempty"`
+	List                 []*ShardLeaderList `protobuf:"bytes,2,rep,name=list,proto3" json:"list,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}           `json:"-"`
+	XXX_unrecognized     []byte             `json:"-"`
+	XXX_sizecache        int32              `json:"-"`
+}
+
+func (m *GetShardLeadersResponse) Reset()         { *m = GetShardLeadersResponse{} }
+func (m *GetShardLeadersResponse) String() string { return proto.CompactTextString(m) }
+func (*GetShardLeadersResponse) ProtoMessage()    {}
+func (*GetShardLeadersResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_aab7cc9a69ed26e8, []int{15}
+}
+
+func (m *GetShardLeadersResponse) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_GetShardLeadersResponse.Unmarshal(m, b)
+}
+func (m *GetShardLeadersResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_GetShardLeadersResponse.Marshal(b, m, deterministic)
+}
+func (m *GetShardLeadersResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_GetShardLeadersResponse.Merge(m, src)
+}
+func (m *GetShardLeadersResponse) XXX_Size() int {
+	return xxx_messageInfo_GetShardLeadersResponse.Size(m)
+}
+func (m *GetShardLeadersResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_GetShardLeadersResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_GetShardLeadersResponse proto.InternalMessageInfo
+
+func (m *GetShardLeadersResponse) GetStatus() *commonpb.Status {
+	if m != nil {
+		return m.Status
+	}
+	return nil
+}
+
+func (m *GetShardLeadersResponse) GetList() []*ShardLeaderList {
+	if m != nil {
+		return m.List
+	}
+	return nil
+}
+
+type ShardLeaderList struct {
+	ChannelName          string   `protobuf:"bytes,1,opt,name=channel_name,json=channelName,proto3" json:"channel_name,omitempty"`
+	NodeID               int64    `protobuf:"varint,2,opt,name=nodeID,proto3" json:"nodeID,omitempty"`
+	Address              string   `protobuf:"bytes,3,opt,name=address,proto3" json:"address,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *ShardLeaderList) Reset()         { *m = ShardLeaderList{} }
+func (m *ShardLeaderList) String() string { return proto.CompactTextString(m) }
+func (*ShardLeaderList) ProtoMessage()    {}
+func (*ShardLeaderList) Descriptor() ([]byte, []int) {
+	return fileDescriptor_aab7cc9a69ed26e8, []int{16}
+}
+
+func (m *ShardLeaderList) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_ShardLeaderList.Unmarshal(m, b)
+}
+func (m *ShardLeaderList) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_ShardLeaderList.Marshal(b, m, deterministic)
+}
+func (m *ShardLeaderList) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_ShardLeaderList.Merge(m, src)
+}
+func (m *ShardLeaderList) XXX_Size() int {
+	return xxx_messageInfo_ShardLeaderList.Size(m)
+}
+func (m *ShardLeaderList) XXX_DiscardUnknown() {
+	xxx_messageInfo_ShardLeaderList.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_ShardLeaderList proto.InternalMessageInfo
+
+func (m *ShardLeaderList) GetChannelName() string {
+	if m != nil {
+		return m.ChannelName
+	}
+	return ""
+}
+
+func (m *ShardLeaderList) GetNodeID() int64 {
+	if m != nil {
+		return m.NodeID
+	}
+	return 0
+}
+
+func (m *ShardLeaderList) GetAddress() string {
+	if m != nil {
+		return m.Address
+	}
+	return ""
+}
+
 //-----------------query node grpc request and response proto----------------
 type AddQueryChannelRequest struct {
 	Base                 *commonpb.MsgBase       `protobuf:"bytes,1,opt,name=base,proto3" json:"base,omitempty"`
@@ -978,7 +1127,7 @@ func (m *AddQueryChannelRequest) Reset()         { *m = AddQueryChannelRequest{}
 func (m *AddQueryChannelRequest) String() string { return proto.CompactTextString(m) }
 func (*AddQueryChannelRequest) ProtoMessage()    {}
 func (*AddQueryChannelRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_aab7cc9a69ed26e8, []int{14}
+	return fileDescriptor_aab7cc9a69ed26e8, []int{17}
 }
 
 func (m *AddQueryChannelRequest) XXX_Unmarshal(b []byte) error {
@@ -1063,7 +1212,7 @@ func (m *RemoveQueryChannelRequest) Reset()         { *m = RemoveQueryChannelReq
 func (m *RemoveQueryChannelRequest) String() string { return proto.CompactTextString(m) }
 func (*RemoveQueryChannelRequest) ProtoMessage()    {}
 func (*RemoveQueryChannelRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_aab7cc9a69ed26e8, []int{15}
+	return fileDescriptor_aab7cc9a69ed26e8, []int{18}
 }
 
 func (m *RemoveQueryChannelRequest) XXX_Unmarshal(b []byte) error {
@@ -1132,7 +1281,7 @@ func (m *LoadMetaInfo) Reset()         { *m = LoadMetaInfo{} }
 func (m *LoadMetaInfo) String() string { return proto.CompactTextString(m) }
 func (*LoadMetaInfo) ProtoMessage()    {}
 func (*LoadMetaInfo) Descriptor() ([]byte, []int) {
-	return fileDescriptor_aab7cc9a69ed26e8, []int{16}
+	return fileDescriptor_aab7cc9a69ed26e8, []int{19}
 }
 
 func (m *LoadMetaInfo) XXX_Unmarshal(b []byte) error {
@@ -1192,7 +1341,7 @@ func (m *WatchDmChannelsRequest) Reset()         { *m = WatchDmChannelsRequest{}
 func (m *WatchDmChannelsRequest) String() string { return proto.CompactTextString(m) }
 func (*WatchDmChannelsRequest) ProtoMessage()    {}
 func (*WatchDmChannelsRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_aab7cc9a69ed26e8, []int{17}
+	return fileDescriptor_aab7cc9a69ed26e8, []int{20}
 }
 
 func (m *WatchDmChannelsRequest) XXX_Unmarshal(b []byte) error {
@@ -1284,7 +1433,7 @@ func (m *WatchDeltaChannelsRequest) Reset()         { *m = WatchDeltaChannelsReq
 func (m *WatchDeltaChannelsRequest) String() string { return proto.CompactTextString(m) }
 func (*WatchDeltaChannelsRequest) ProtoMessage()    {}
 func (*WatchDeltaChannelsRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_aab7cc9a69ed26e8, []int{18}
+	return fileDescriptor_aab7cc9a69ed26e8, []int{21}
 }
 
 func (m *WatchDeltaChannelsRequest) XXX_Unmarshal(b []byte) error {
@@ -1362,7 +1511,7 @@ func (m *SegmentLoadInfo) Reset()         { *m = SegmentLoadInfo{} }
 func (m *SegmentLoadInfo) String() string { return proto.CompactTextString(m) }
 func (*SegmentLoadInfo) ProtoMessage()    {}
 func (*SegmentLoadInfo) Descriptor() ([]byte, []int) {
-	return fileDescriptor_aab7cc9a69ed26e8, []int{19}
+	return fileDescriptor_aab7cc9a69ed26e8, []int{22}
 }
 
 func (m *SegmentLoadInfo) XXX_Unmarshal(b []byte) error {
@@ -1485,7 +1634,7 @@ func (m *FieldIndexInfo) Reset()         { *m = FieldIndexInfo{} }
 func (m *FieldIndexInfo) String() string { return proto.CompactTextString(m) }
 func (*FieldIndexInfo) ProtoMessage()    {}
 func (*FieldIndexInfo) Descriptor() ([]byte, []int) {
-	return fileDescriptor_aab7cc9a69ed26e8, []int{20}
+	return fileDescriptor_aab7cc9a69ed26e8, []int{23}
 }
 
 func (m *FieldIndexInfo) XXX_Unmarshal(b []byte) error {
@@ -1579,7 +1728,7 @@ func (m *LoadSegmentsRequest) Reset()         { *m = LoadSegmentsRequest{} }
 func (m *LoadSegmentsRequest) String() string { return proto.CompactTextString(m) }
 func (*LoadSegmentsRequest) ProtoMessage()    {}
 func (*LoadSegmentsRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_aab7cc9a69ed26e8, []int{21}
+	return fileDescriptor_aab7cc9a69ed26e8, []int{24}
 }
 
 func (m *LoadSegmentsRequest) XXX_Unmarshal(b []byte) error {
@@ -1666,7 +1815,7 @@ func (m *ReleaseSegmentsRequest) Reset()         { *m = ReleaseSegmentsRequest{}
 func (m *ReleaseSegmentsRequest) String() string { return proto.CompactTextString(m) }
 func (*ReleaseSegmentsRequest) ProtoMessage()    {}
 func (*ReleaseSegmentsRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_aab7cc9a69ed26e8, []int{22}
+	return fileDescriptor_aab7cc9a69ed26e8, []int{25}
 }
 
 func (m *ReleaseSegmentsRequest) XXX_Unmarshal(b []byte) error {
@@ -1742,7 +1891,7 @@ func (m *SearchRequest) Reset()         { *m = SearchRequest{} }
 func (m *SearchRequest) String() string { return proto.CompactTextString(m) }
 func (*SearchRequest) ProtoMessage()    {}
 func (*SearchRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_aab7cc9a69ed26e8, []int{23}
+	return fileDescriptor_aab7cc9a69ed26e8, []int{26}
 }
 
 func (m *SearchRequest) XXX_Unmarshal(b []byte) error {
@@ -1797,7 +1946,7 @@ func (m *QueryRequest) Reset()         { *m = QueryRequest{} }
 func (m *QueryRequest) String() string { return proto.CompactTextString(m) }
 func (*QueryRequest) ProtoMessage()    {}
 func (*QueryRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_aab7cc9a69ed26e8, []int{24}
+	return fileDescriptor_aab7cc9a69ed26e8, []int{27}
 }
 
 func (m *QueryRequest) XXX_Unmarshal(b []byte) error {
@@ -1852,7 +2001,7 @@ func (m *HandoffSegmentsRequest) Reset()         { *m = HandoffSegmentsRequest{}
 func (m *HandoffSegmentsRequest) String() string { return proto.CompactTextString(m) }
 func (*HandoffSegmentsRequest) ProtoMessage()    {}
 func (*HandoffSegmentsRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_aab7cc9a69ed26e8, []int{25}
+	return fileDescriptor_aab7cc9a69ed26e8, []int{28}
 }
 
 func (m *HandoffSegmentsRequest) XXX_Unmarshal(b []byte) error {
@@ -1902,7 +2051,7 @@ func (m *LoadBalanceRequest) Reset()         { *m = LoadBalanceRequest{} }
 func (m *LoadBalanceRequest) String() string { return proto.CompactTextString(m) }
 func (*LoadBalanceRequest) ProtoMessage()    {}
 func (*LoadBalanceRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_aab7cc9a69ed26e8, []int{26}
+	return fileDescriptor_aab7cc9a69ed26e8, []int{29}
 }
 
 func (m *LoadBalanceRequest) XXX_Unmarshal(b []byte) error {
@@ -1971,7 +2120,7 @@ func (m *DmChannelWatchInfo) Reset()         { *m = DmChannelWatchInfo{} }
 func (m *DmChannelWatchInfo) String() string { return proto.CompactTextString(m) }
 func (*DmChannelWatchInfo) ProtoMessage()    {}
 func (*DmChannelWatchInfo) Descriptor() ([]byte, []int) {
-	return fileDescriptor_aab7cc9a69ed26e8, []int{27}
+	return fileDescriptor_aab7cc9a69ed26e8, []int{30}
 }
 
 func (m *DmChannelWatchInfo) XXX_Unmarshal(b []byte) error {
@@ -2028,7 +2177,7 @@ func (m *QueryChannelInfo) Reset()         { *m = QueryChannelInfo{} }
 func (m *QueryChannelInfo) String() string { return proto.CompactTextString(m) }
 func (*QueryChannelInfo) ProtoMessage()    {}
 func (*QueryChannelInfo) Descriptor() ([]byte, []int) {
-	return fileDescriptor_aab7cc9a69ed26e8, []int{28}
+	return fileDescriptor_aab7cc9a69ed26e8, []int{31}
 }
 
 func (m *QueryChannelInfo) XXX_Unmarshal(b []byte) error {
@@ -2097,7 +2246,7 @@ func (m *PartitionStates) Reset()         { *m = PartitionStates{} }
 func (m *PartitionStates) String() string { return proto.CompactTextString(m) }
 func (*PartitionStates) ProtoMessage()    {}
 func (*PartitionStates) Descriptor() ([]byte, []int) {
-	return fileDescriptor_aab7cc9a69ed26e8, []int{29}
+	return fileDescriptor_aab7cc9a69ed26e8, []int{32}
 }
 
 func (m *PartitionStates) XXX_Unmarshal(b []byte) error {
@@ -2164,7 +2313,7 @@ func (m *SegmentInfo) Reset()         { *m = SegmentInfo{} }
 func (m *SegmentInfo) String() string { return proto.CompactTextString(m) }
 func (*SegmentInfo) ProtoMessage()    {}
 func (*SegmentInfo) Descriptor() ([]byte, []int) {
-	return fileDescriptor_aab7cc9a69ed26e8, []int{30}
+	return fileDescriptor_aab7cc9a69ed26e8, []int{33}
 }
 
 func (m *SegmentInfo) XXX_Unmarshal(b []byte) error {
@@ -2308,7 +2457,7 @@ func (m *CollectionInfo) Reset()         { *m = CollectionInfo{} }
 func (m *CollectionInfo) String() string { return proto.CompactTextString(m) }
 func (*CollectionInfo) ProtoMessage()    {}
 func (*CollectionInfo) Descriptor() ([]byte, []int) {
-	return fileDescriptor_aab7cc9a69ed26e8, []int{31}
+	return fileDescriptor_aab7cc9a69ed26e8, []int{34}
 }
 
 func (m *CollectionInfo) XXX_Unmarshal(b []byte) error {
@@ -2397,7 +2546,7 @@ func (m *UnsubscribeChannels) Reset()         { *m = UnsubscribeChannels{} }
 func (m *UnsubscribeChannels) String() string { return proto.CompactTextString(m) }
 func (*UnsubscribeChannels) ProtoMessage()    {}
 func (*UnsubscribeChannels) Descriptor() ([]byte, []int) {
-	return fileDescriptor_aab7cc9a69ed26e8, []int{32}
+	return fileDescriptor_aab7cc9a69ed26e8, []int{35}
 }
 
 func (m *UnsubscribeChannels) XXX_Unmarshal(b []byte) error {
@@ -2444,7 +2593,7 @@ func (m *UnsubscribeChannelInfo) Reset()         { *m = UnsubscribeChannelInfo{}
 func (m *UnsubscribeChannelInfo) String() string { return proto.CompactTextString(m) }
 func (*UnsubscribeChannelInfo) ProtoMessage()    {}
 func (*UnsubscribeChannelInfo) Descriptor() ([]byte, []int) {
-	return fileDescriptor_aab7cc9a69ed26e8, []int{33}
+	return fileDescriptor_aab7cc9a69ed26e8, []int{36}
 }
 
 func (m *UnsubscribeChannelInfo) XXX_Unmarshal(b []byte) error {
@@ -2494,7 +2643,7 @@ func (m *SegmentChangeInfo) Reset()         { *m = SegmentChangeInfo{} }
 func (m *SegmentChangeInfo) String() string { return proto.CompactTextString(m) }
 func (*SegmentChangeInfo) ProtoMessage()    {}
 func (*SegmentChangeInfo) Descriptor() ([]byte, []int) {
-	return fileDescriptor_aab7cc9a69ed26e8, []int{34}
+	return fileDescriptor_aab7cc9a69ed26e8, []int{37}
 }
 
 func (m *SegmentChangeInfo) XXX_Unmarshal(b []byte) error {
@@ -2555,7 +2704,7 @@ func (m *SealedSegmentsChangeInfo) Reset()         { *m = SealedSegmentsChangeIn
 func (m *SealedSegmentsChangeInfo) String() string { return proto.CompactTextString(m) }
 func (*SealedSegmentsChangeInfo) ProtoMessage()    {}
 func (*SealedSegmentsChangeInfo) Descriptor() ([]byte, []int) {
-	return fileDescriptor_aab7cc9a69ed26e8, []int{35}
+	return fileDescriptor_aab7cc9a69ed26e8, []int{38}
 }
 
 func (m *SealedSegmentsChangeInfo) XXX_Unmarshal(b []byte) error {
@@ -2605,7 +2754,7 @@ func (m *ReplicaInfo) Reset()         { *m = ReplicaInfo{} }
 func (m *ReplicaInfo) String() string { return proto.CompactTextString(m) }
 func (*ReplicaInfo) ProtoMessage()    {}
 func (*ReplicaInfo) Descriptor() ([]byte, []int) {
-	return fileDescriptor_aab7cc9a69ed26e8, []int{36}
+	return fileDescriptor_aab7cc9a69ed26e8, []int{39}
 }
 
 func (m *ReplicaInfo) XXX_Unmarshal(b []byte) error {
@@ -2673,7 +2822,7 @@ func (m *ShardReplica) Reset()         { *m = ShardReplica{} }
 func (m *ShardReplica) String() string { return proto.CompactTextString(m) }
 func (*ShardReplica) ProtoMessage()    {}
 func (*ShardReplica) Descriptor() ([]byte, []int) {
-	return fileDescriptor_aab7cc9a69ed26e8, []int{37}
+	return fileDescriptor_aab7cc9a69ed26e8, []int{40}
 }
 
 func (m *ShardReplica) XXX_Unmarshal(b []byte) error {
@@ -2726,6 +2875,9 @@ func init() {
 	proto.RegisterType((*GetPartitionStatesResponse)(nil), "milvus.proto.query.GetPartitionStatesResponse")
 	proto.RegisterType((*GetSegmentInfoRequest)(nil), "milvus.proto.query.GetSegmentInfoRequest")
 	proto.RegisterType((*GetSegmentInfoResponse)(nil), "milvus.proto.query.GetSegmentInfoResponse")
+	proto.RegisterType((*GetShardLeadersRequest)(nil), "milvus.proto.query.GetShardLeadersRequest")
+	proto.RegisterType((*GetShardLeadersResponse)(nil), "milvus.proto.query.GetShardLeadersResponse")
+	proto.RegisterType((*ShardLeaderList)(nil), "milvus.proto.query.ShardLeaderList")
 	proto.RegisterType((*AddQueryChannelRequest)(nil), "milvus.proto.query.AddQueryChannelRequest")
 	proto.RegisterType((*RemoveQueryChannelRequest)(nil), "milvus.proto.query.RemoveQueryChannelRequest")
 	proto.RegisterType((*LoadMetaInfo)(nil), "milvus.proto.query.LoadMetaInfo")
@@ -2755,174 +2907,180 @@ func init() {
 func init() { proto.RegisterFile("query_coord.proto", fileDescriptor_aab7cc9a69ed26e8) }
 
 var fileDescriptor_aab7cc9a69ed26e8 = []byte{
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+	0xb2, 0xd7, 0x9d, 0xf2, 0x15, 0xe4, 0x5e, 0x8b, 0x1e, 0xc5, 0xe3, 0x21, 0xbf, 0x8d, 0x8f, 0x76,
+	0x1f, 0x57, 0xf3, 0x72, 0x41, 0xea, 0x1c, 0xf7, 0xd5, 0x57, 0x87, 0x97, 0x5f, 0x3d, 0x1f, 0x43,
+	0x2b, 0x75, 0x6b, 0x21, 0xb7, 0xae, 0xfc, 0x6a, 0xe3, 0x28, 0xea, 0x9f, 0x63, 0xbe, 0xbf, 0x0f,
+	0x15, 0x7e, 0xd9, 0x80, 0x2e, 0xca, 0xf7, 0x62, 0xb1, 0x8b, 0x88, 0xee, 0xe1, 0x97, 0x15, 0x64,
+	0x6c, 0x07, 0x54, 0xfa, 0x6d, 0x28, 0xb3, 0x78, 0x41, 0xd2, 0xed, 0x51, 0xfc, 0x4a, 0xa1, 0x7b,
+	0xe8, 0xad, 0x43, 0x48, 0xef, 0x65, 0x17, 0x8f, 0xb5, 0x77, 0x1f, 0xad, 0x0e, 0xad, 0x60, 0x7f,
+	0xdc, 0xa3, 0x86, 0xb8, 0xc1, 0x31, 0xdf, 0xb1, 0x3c, 0xf1, 0x75, 0x23, 0xcc, 0x6b, 0x37, 0x18,
+	0xa5, 0x1b, 0x6c, 0x19, 0xa3, 0x5e, 0xaf, 0xc2, 0x86, 0xb7, 0xfe, 0x13, 0x00, 0x00, 0xff, 0xff,
+	0x78, 0x6f, 0x0c, 0x8d, 0x41, 0x30, 0x00, 0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -2952,6 +3110,8 @@ type QueryCoordClient interface {
 	LoadBalance(ctx context.Context, in *LoadBalanceRequest, opts ...grpc.CallOption) (*commonpb.Status, error)
 	// https://wiki.lfaidata.foundation/display/MIL/MEP+8+--+Add+metrics+for+proxy
 	GetMetrics(ctx context.Context, in *milvuspb.GetMetricsRequest, opts ...grpc.CallOption) (*milvuspb.GetMetricsResponse, error)
+	// https://wiki.lfaidata.foundation/display/MIL/MEP+23+--+Multiple+memory+replication+design
+	GetShardLeaders(ctx context.Context, in *GetShardLeadersRequest, opts ...grpc.CallOption) (*GetShardLeadersResponse, error)
 }
 
 type queryCoordClient struct {
@@ -3088,6 +3248,15 @@ func (c *queryCoordClient) GetMetrics(ctx context.Context, in *milvuspb.GetMetri
 	return out, nil
 }
 
+func (c *queryCoordClient) GetShardLeaders(ctx context.Context, in *GetShardLeadersRequest, opts ...grpc.CallOption) (*GetShardLeadersResponse, error) {
+	out := new(GetShardLeadersResponse)
+	err := c.cc.Invoke(ctx, "/milvus.proto.query.QueryCoord/GetShardLeaders", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // QueryCoordServer is the server API for QueryCoord service.
 type QueryCoordServer interface {
 	GetComponentStates(context.Context, *internalpb.GetComponentStatesRequest) (*internalpb.ComponentStates, error)
@@ -3105,6 +3274,8 @@ type QueryCoordServer interface {
 	LoadBalance(context.Context, *LoadBalanceRequest) (*commonpb.Status, error)
 	// https://wiki.lfaidata.foundation/display/MIL/MEP+8+--+Add+metrics+for+proxy
 	GetMetrics(context.Context, *milvuspb.GetMetricsRequest) (*milvuspb.GetMetricsResponse, error)
+	// https://wiki.lfaidata.foundation/display/MIL/MEP+23+--+Multiple+memory+replication+design
+	GetShardLeaders(context.Context, *GetShardLeadersRequest) (*GetShardLeadersResponse, error)
 }
 
 // UnimplementedQueryCoordServer can be embedded to have forward compatible implementations.
@@ -3153,6 +3324,9 @@ func (*UnimplementedQueryCoordServer) LoadBalance(ctx context.Context, req *Load
 func (*UnimplementedQueryCoordServer) GetMetrics(ctx context.Context, req *milvuspb.GetMetricsRequest) (*milvuspb.GetMetricsResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method GetMetrics not implemented")
 }
+func (*UnimplementedQueryCoordServer) GetShardLeaders(ctx context.Context, req *GetShardLeadersRequest) (*GetShardLeadersResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method GetShardLeaders not implemented")
+}
 
 func RegisterQueryCoordServer(s *grpc.Server, srv QueryCoordServer) {
 	s.RegisterService(&_QueryCoord_serviceDesc, srv)
@@ -3410,6 +3584,24 @@ func _QueryCoord_GetMetrics_Handler(srv interface{}, ctx context.Context, dec fu
 	return interceptor(ctx, in, info, handler)
 }
 
+func _QueryCoord_GetShardLeaders_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(GetShardLeadersRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(QueryCoordServer).GetShardLeaders(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/milvus.proto.query.QueryCoord/GetShardLeaders",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(QueryCoordServer).GetShardLeaders(ctx, req.(*GetShardLeadersRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 var _QueryCoord_serviceDesc = grpc.ServiceDesc{
 	ServiceName: "milvus.proto.query.QueryCoord",
 	HandlerType: (*QueryCoordServer)(nil),
@@ -3470,6 +3662,10 @@ var _QueryCoord_serviceDesc = grpc.ServiceDesc{
 			MethodName: "GetMetrics",
 			Handler:    _QueryCoord_GetMetrics_Handler,
 		},
+		{
+			MethodName: "GetShardLeaders",
+			Handler:    _QueryCoord_GetShardLeaders_Handler,
+		},
 	},
 	Streams:  []grpc.StreamDesc{},
 	Metadata: "query_coord.proto",

internal/proxy/query_coord_mock_test.go

@@ -332,6 +332,24 @@ func (coord *QueryCoordMock) GetMetrics(ctx context.Context, req *milvuspb.GetMe
 	}, nil
 }
 
+func (coord *QueryCoordMock) GetShardLeaders(ctx context.Context, req *querypb.GetShardLeadersRequest) (*querypb.GetShardLeadersResponse, error) {
+	if !coord.healthy() {
+		return &querypb.GetShardLeadersResponse{
+			Status: &commonpb.Status{
+				ErrorCode: commonpb.ErrorCode_UnexpectedError,
+				Reason:    "unhealthy",
+			},
+		}, nil
+	}
+
+	return &querypb.GetShardLeadersResponse{
+		Status: &commonpb.Status{
+			ErrorCode: commonpb.ErrorCode_UnexpectedError,
+			Reason:    "not implemented",
+		},
+	}, nil
+}
+
 func NewQueryCoordMock(opts ...QueryCoordMockOption) *QueryCoordMock {
 	coord := &QueryCoordMock{
 		nodeID:              UniqueID(uniquegenerator.GetUniqueIntGeneratorIns().GetInt()),

internal/querycoord/impl.go

@@ -1015,3 +1015,14 @@ func (qc *QueryCoord) GetMetrics(ctx context.Context, req *milvuspb.GetMetricsRe
 
 	return getMetricsResponse, nil
 }
+
+// GetShardLeaders gets shard leaders of a certain collection
+func (qc *QueryCoord) GetShardLeaders(ctx context.Context, req *querypb.GetShardLeadersRequest) (*querypb.GetShardLeadersResponse, error) {
+	// TODO: to impl
+	return &querypb.GetShardLeadersResponse{
+		Status: &commonpb.Status{
+			ErrorCode: commonpb.ErrorCode_UnexpectedError,
+			Reason:    "Not implemented",
+		},
+	}, nil
+}

internal/types/types.go

@@ -1168,6 +1168,8 @@ type QueryCoord interface {
 	LoadBalance(ctx context.Context, req *querypb.LoadBalanceRequest) (*commonpb.Status, error)
 
 	GetMetrics(ctx context.Context, req *milvuspb.GetMetricsRequest) (*milvuspb.GetMetricsResponse, error)
+
+	GetShardLeaders(ctx context.Context, req *querypb.GetShardLeadersRequest) (*querypb.GetShardLeadersResponse, error)
 }
 
 // QueryCoordComponent is used by grpc server of QueryCoord

internal/util/mock/querycoord_client.go

@@ -27,6 +27,9 @@ import (
 	"github.com/milvus-io/milvus/internal/proto/querypb"
 )
 
+// Check if QueryCoordClient implements proto.QueryCoordClient
+var _ querypb.QueryCoordClient = &QueryCoordClient{}
+
 type QueryCoordClient struct {
 	Err error
 }
@@ -86,3 +89,7 @@ func (m *QueryCoordClient) LoadBalance(ctx context.Context, in *querypb.LoadBala
 func (m *QueryCoordClient) GetMetrics(ctx context.Context, in *milvuspb.GetMetricsRequest, opts ...grpc.CallOption) (*milvuspb.GetMetricsResponse, error) {
 	return &milvuspb.GetMetricsResponse{}, m.Err
 }
+
+func (m *QueryCoordClient) GetShardLeaders(ctx context.Context, in *querypb.GetShardLeadersRequest, opts ...grpc.CallOption) (*querypb.GetShardLeadersResponse, error) {
+	return &querypb.GetShardLeadersResponse{}, m.Err
+}