Fix an issue with bulk load with multiple DataNodes (#17324)

issue: #17300
Signed-off-by: Yuchen Gao <yuchen.gao@zilliz.com>

deployments/docker/cluster/docker-compose-apple-silicon.yml

@@ -0,0 +1,187 @@
+version: '3.5'
+
+services:
+  etcd:
+    container_name: milvus-etcd
+    image: quay.io/coreos/etcd:v3.5.0
+    environment:
+      - ETCD_AUTO_COMPACTION_MODE=revision
+      - ETCD_AUTO_COMPACTION_RETENTION=1000
+      - ETCD_QUOTA_BACKEND_BYTES=4294967296
+    volumes:
+      - ${DOCKER_VOLUME_DIRECTORY:-.}/volumes/etcd:/etcd
+    command: etcd -advertise-client-urls=http://127.0.0.1:2379 -listen-client-urls http://0.0.0.0:2379 --data-dir /etcd
+
+  pulsar:
+    container_name: milvus-pulsar
+    image: milvusdb/pulsar:v2.8.2-m1
+    volumes:
+      - ${DOCKER_VOLUME_DIRECTORY:-.}/volumes/pulsar:/pulsar/data
+    environment:
+      # bin/apply-config-from-env.py script will modify the configuration file based on the environment variables
+      # nettyMaxFrameSizeBytes must be calculated from maxMessageSize + 10240 (padding)
+      - nettyMaxFrameSizeBytes=104867840 # this is 104857600 + 10240 (padding)
+      - defaultRetentionTimeInMinutes=10080
+      - defaultRetentionSizeInMB=8192
+      # maxMessageSize is missing from standalone.conf, must use PULSAR_PREFIX_ to get it configured
+      - PULSAR_PREFIX_maxMessageSize=104857600
+      - PULSAR_GC=-XX:+UseG1GC
+
+  minio:
+    container_name: milvus-minio
+    image: minio/minio:RELEASE.2022-03-17T06-34-49Z
+    ports:
+      - "9000:9000"
+      - "9001:9001"
+    environment:
+      MINIO_ACCESS_KEY: minioadmin
+      MINIO_SECRET_KEY: minioadmin
+    volumes:
+      - ${DOCKER_VOLUME_DIRECTORY:-.}/volumes/minio:/minio_data
+    command: minio server /minio_data --console-address ":9001"
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:9000/minio/health/live"]
+      interval: 30s
+      timeout: 20s
+      retries: 3
+
+  rootcoord:
+    container_name: milvus-rootcoord
+    image: milvusdb/milvus:v2.0.2
+    command: ["milvus", "run", "rootcoord"]
+    environment:
+      ETCD_ENDPOINTS: etcd:2379
+      MINIO_ADDRESS: minio:9000
+      PULSAR_ADDRESS: pulsar://pulsar:6650
+      ROOT_COORD_ADDRESS: rootcoord:53100
+    depends_on:
+      - "etcd"
+      - "pulsar"
+      - "minio"
+
+  proxy:
+    container_name: milvus-proxy
+    image: milvusdb/milvus:v2.0.2
+    command: ["milvus", "run", "proxy"]
+    environment:
+      ETCD_ENDPOINTS: etcd:2379
+      MINIO_ADDRESS: minio:9000
+      PULSAR_ADDRESS: pulsar://pulsar:6650
+    ports:
+      - "19530:19530"
+
+  querycoord:
+    container_name: milvus-querycoord
+    image: milvusdb/milvus:v2.0.2
+    command: ["milvus", "run", "querycoord"]
+    environment:
+      ETCD_ENDPOINTS: etcd:2379
+      MINIO_ADDRESS: minio:9000
+      PULSAR_ADDRESS: pulsar://pulsar:6650
+      QUERY_COORD_ADDRESS: querycoord:19531
+    depends_on:
+      - "etcd"
+      - "pulsar"
+      - "minio"
+
+  querynode:
+    container_name: milvus-querynode
+    image: milvusdb/milvus:v2.0.2
+    command: ["milvus", "run", "querynode"]
+    environment:
+      ETCD_ENDPOINTS: etcd:2379
+      MINIO_ADDRESS: minio:9000
+      PULSAR_ADDRESS: pulsar://pulsar:6650
+    depends_on:
+      - "querycoord"
+
+  indexcoord:
+    container_name: milvus-indexcoord
+    image: milvusdb/milvus:v2.0.2
+    command: ["milvus", "run", "indexcoord"]
+    environment:
+      ETCD_ENDPOINTS: etcd:2379
+      MINIO_ADDRESS: minio:9000
+      PULSAR_ADDRESS: pulsar://pulsar:6650
+      INDEX_COORD_ADDRESS: indexcoord:31000
+    depends_on:
+      - "etcd"
+      - "pulsar"
+      - "minio"
+
+  indexnode:
+    container_name: milvus-indexnode
+    image: milvusdb/milvus:v2.0.2
+    command: ["milvus", "run", "indexnode"]
+    environment:
+      ETCD_ENDPOINTS: etcd:2379
+      MINIO_ADDRESS: minio:9000
+      PULSAR_ADDRESS: pulsar://pulsar:6650
+      INDEX_COORD_ADDRESS: indexcoord:31000
+    depends_on:
+      - "indexcoord"
+
+  datacoord:
+    container_name: milvus-datacoord
+    image: milvusdb/milvus:v2.0.2
+    command: ["milvus", "run", "datacoord"]
+    environment:
+      ETCD_ENDPOINTS: etcd:2379
+      MINIO_ADDRESS: minio:9000
+      PULSAR_ADDRESS: pulsar://pulsar:6650
+      DATA_COORD_ADDRESS: datacoord:13333
+    depends_on:
+      - "etcd"
+      - "pulsar"
+      - "minio"
+
+  datanode:
+    container_name: milvus-datanode
+    image: milvusdb/milvus:v2.0.2
+    command: ["milvus", "run", "datanode"]
+    environment:
+      ETCD_ENDPOINTS: etcd:2379
+      MINIO_ADDRESS: minio:9000
+      PULSAR_ADDRESS: pulsar://pulsar:6650
+    depends_on:
+      - "datacoord"
+
+# ----------------------------------------------------------------------------------------
+# If you need multiple instances of a service, say DataNode, use the following script:
+# ----------------------------------------------------------------------------------------
+#  datanode-1:
+#    container_name: milvus-datanode-1
+#    image: milvusdb/milvus:v2.0.2
+#    command: ["milvus", "run", "datanode"]
+#    environment:
+#      ETCD_ENDPOINTS: etcd:2379
+#      MINIO_ADDRESS: minio:9000
+#      PULSAR_ADDRESS: pulsar://pulsar:6650
+#    depends_on:
+#      - "datacoord"
+#
+#  datanode-2:
+#    container_name: milvus-datanode-2
+#    image: milvusdb/milvus:v2.0.2
+#    command: ["milvus", "run", "datanode"]
+#    environment:
+#      ETCD_ENDPOINTS: etcd:2379
+#      MINIO_ADDRESS: minio:9000
+#      PULSAR_ADDRESS: pulsar://pulsar:6650
+#    depends_on:
+#      - "datacoord"
+#
+#  datanode-3:
+#    container_name: milvus-datanode-3
+#    image: milvusdb/milvus:v2.0.2
+#    command: ["milvus", "run", "datanode"]
+#    environment:
+#      ETCD_ENDPOINTS: etcd:2379
+#      MINIO_ADDRESS: minio:9000
+#      PULSAR_ADDRESS: pulsar://pulsar:6650
+#    depends_on:
+#      - "datacoord"
+
+networks:
+  default:
+    name: milvus

deployments/docker/cluster/docker-compose.yml

@@ -37,9 +37,12 @@ services:
     environment:
       MINIO_ACCESS_KEY: minioadmin
       MINIO_SECRET_KEY: minioadmin
+    ports:
+      - "9000:9000"
+      - "9001:9001"
     volumes:
       - ${DOCKER_VOLUME_DIRECTORY:-.}/volumes/minio:/minio_data
-    command: minio server /minio_data
+    command: minio server /minio_data --console-address ":9001"
     healthcheck:
       test: ["CMD", "curl", "-f", "http://localhost:9000/minio/health/live"]
       interval: 30s
@@ -147,6 +150,43 @@ services:
     depends_on:
       - "datacoord"
 
+# ----------------------------------------------------------------------------------------
+# If you need multiple instances of a service, say DataNode, use the following script:
+# ----------------------------------------------------------------------------------------
+#  datanode-1:
+#    container_name: milvus-datanode-1
+#    image: milvusdb/milvus:v2.0.2
+#    command: ["milvus", "run", "datanode"]
+#    environment:
+#      ETCD_ENDPOINTS: etcd:2379
+#      MINIO_ADDRESS: minio:9000
+#      PULSAR_ADDRESS: pulsar://pulsar:6650
+#    depends_on:
+#      - "datacoord"
+#
+#  datanode-2:
+#    container_name: milvus-datanode-2
+#    image: milvusdb/milvus:v2.0.2
+#    command: ["milvus", "run", "datanode"]
+#    environment:
+#      ETCD_ENDPOINTS: etcd:2379
+#      MINIO_ADDRESS: minio:9000
+#      PULSAR_ADDRESS: pulsar://pulsar:6650
+#    depends_on:
+#      - "datacoord"
+#
+#  datanode-3:
+#    container_name: milvus-datanode-3
+#    image: milvusdb/milvus:v2.0.2
+#    command: ["milvus", "run", "datanode"]
+#    environment:
+#      ETCD_ENDPOINTS: etcd:2379
+#      MINIO_ADDRESS: minio:9000
+#      PULSAR_ADDRESS: pulsar://pulsar:6650
+#    depends_on:
+#      - "datacoord"
+
+
 networks:
   default:
     name: milvus

internal/datacoord/channel_manager.go

@@ -803,6 +803,17 @@ func (c *ChannelManager) getChannelByNodeAndName(nodeID UniqueID, channelName st
 	return ret
 }
 
+func (c *ChannelManager) getNodeIDByChannelName(chName string) (bool, UniqueID) {
+	for _, nodeChannel := range c.GetChannels() {
+		for _, ch := range nodeChannel.Channels {
+			if ch.Name == chName {
+				return true, nodeChannel.NodeID
+			}
+		}
+	}
+	return false, 0
+}
+
 func (c *ChannelManager) isMarkedDrop(channelName string) bool {
 	return c.h.CheckShouldDropChannel(channelName)
 }

internal/datacoord/cluster.go

@@ -149,6 +149,11 @@ func (c *Cluster) ReCollectSegmentStats(ctx context.Context, nodeID int64) {
 	c.sessionManager.ReCollectSegmentStats(ctx, nodeID)
 }
 
+// AddSegment triggers a AddSegment call from session manager.
+func (c *Cluster) AddSegment(ctx context.Context, nodeID int64, req *datapb.AddSegmentRequest) {
+	c.sessionManager.AddSegment(ctx, nodeID, req)
+}
+
 // GetSessions returns all sessions
 func (c *Cluster) GetSessions() []*Session {
 	return c.sessionManager.GetSessions()

internal/datacoord/cluster_test.go

@@ -25,6 +25,7 @@ import (
 	"github.com/golang/protobuf/proto"
 	"github.com/milvus-io/milvus/internal/kv"
 	etcdkv "github.com/milvus-io/milvus/internal/kv/etcd"
+	"github.com/milvus-io/milvus/internal/proto/commonpb"
 	"github.com/milvus-io/milvus/internal/proto/datapb"
 	"github.com/milvus-io/milvus/internal/types"
 	"github.com/stretchr/testify/assert"
@@ -640,3 +641,74 @@ func TestCluster_ReCollectSegmentStats(t *testing.T) {
 		time.Sleep(500 * time.Millisecond)
 	})
 }
+
+func TestCluster_AddSegment(t *testing.T) {
+	kv := getMetaKv(t)
+	defer func() {
+		kv.RemoveWithPrefix("")
+		kv.Close()
+	}()
+
+	t.Run("add segment succeed", func(t *testing.T) {
+		ctx, cancel := context.WithCancel(context.TODO())
+		defer cancel()
+		var mockSessionCreator = func(ctx context.Context, addr string) (types.DataNode, error) {
+			return newMockDataNodeClient(1, nil)
+		}
+		sessionManager := NewSessionManager(withSessionCreator(mockSessionCreator))
+		channelManager, err := NewChannelManager(kv, newMockHandler())
+		assert.Nil(t, err)
+		cluster := NewCluster(sessionManager, channelManager)
+		defer cluster.Close()
+		addr := "localhost:8080"
+		info := &NodeInfo{
+			Address: addr,
+			NodeID:  1,
+		}
+		nodes := []*NodeInfo{info}
+		err = cluster.Startup(ctx, nodes)
+		assert.Nil(t, err)
+
+		err = cluster.Watch("chan-1", 1)
+		assert.NoError(t, err)
+
+		assert.NotPanics(t, func() {
+			cluster.AddSegment(ctx, 1, &datapb.AddSegmentRequest{
+				Base: &commonpb.MsgBase{
+					SourceID: 0,
+				},
+			})
+		})
+		time.Sleep(500 * time.Millisecond)
+	})
+
+	t.Run("add segment failed", func(t *testing.T) {
+		ctx, cancel := context.WithCancel(context.TODO())
+		defer cancel()
+		sessionManager := NewSessionManager()
+		channelManager, err := NewChannelManager(kv, newMockHandler())
+		assert.Nil(t, err)
+		cluster := NewCluster(sessionManager, channelManager)
+		defer cluster.Close()
+		addr := "localhost:8080"
+		info := &NodeInfo{
+			Address: addr,
+			NodeID:  1,
+		}
+		nodes := []*NodeInfo{info}
+		err = cluster.Startup(ctx, nodes)
+		assert.Nil(t, err)
+
+		err = cluster.Watch("chan-1", 1)
+		assert.NoError(t, err)
+
+		assert.NotPanics(t, func() {
+			cluster.AddSegment(ctx, 1, &datapb.AddSegmentRequest{
+				Base: &commonpb.MsgBase{
+					SourceID: 0,
+				},
+			})
+		})
+		time.Sleep(500 * time.Millisecond)
+	})
+}

internal/datacoord/mock_test.go

@@ -209,6 +209,10 @@ func (c *mockDataNodeClient) Import(ctx context.Context, in *datapb.ImportTaskRe
 	return &commonpb.Status{ErrorCode: commonpb.ErrorCode_Success}, nil
 }
 
+func (c *mockDataNodeClient) AddSegment(ctx context.Context, req *datapb.AddSegmentRequest) (*commonpb.Status, error) {
+	return &commonpb.Status{ErrorCode: commonpb.ErrorCode_Success}, nil
+}
+
 func (c *mockDataNodeClient) Stop() error {
 	c.state = internalpb.StateCode_Abnormal
 	return nil

internal/datacoord/server_test.go

@@ -2520,7 +2520,7 @@ func TestDataCoordServer_SetSegmentState(t *testing.T) {
 	})
 }
 
-func TestImport(t *testing.T) {
+func TestDataCoord_Import(t *testing.T) {
 	t.Run("normal case", func(t *testing.T) {
 		svr := newTestServer(t, nil)
 		defer closeTestServer(t, svr)
@@ -2645,6 +2645,57 @@ func TestImport(t *testing.T) {
 	})
 }
 
+func TestDataCoord_AddSegment(t *testing.T) {
+	t.Run("test add segment", func(t *testing.T) {
+		svr := newTestServer(t, nil)
+		defer closeTestServer(t, svr)
+
+		err := svr.channelManager.AddNode(110)
+		assert.Nil(t, err)
+		err = svr.channelManager.Watch(&channel{"ch1", 100})
+		assert.Nil(t, err)
+
+		status, err := svr.AddSegment(context.TODO(), &datapb.AddSegmentRequest{
+			SegmentId:    100,
+			ChannelName:  "ch1",
+			CollectionId: 100,
+			PartitionId:  100,
+			RowNum:       int64(1),
+		})
+		assert.NoError(t, err)
+		assert.Equal(t, commonpb.ErrorCode_Success, status.GetErrorCode())
+	})
+
+	t.Run("test add segment w/ bad channel name", func(t *testing.T) {
+		svr := newTestServer(t, nil)
+		defer closeTestServer(t, svr)
+
+		err := svr.channelManager.AddNode(110)
+		assert.Nil(t, err)
+		err = svr.channelManager.Watch(&channel{"ch1", 100})
+		assert.Nil(t, err)
+
+		status, err := svr.AddSegment(context.TODO(), &datapb.AddSegmentRequest{
+			SegmentId:    100,
+			ChannelName:  "non-channel",
+			CollectionId: 100,
+			PartitionId:  100,
+			RowNum:       int64(1),
+		})
+		assert.NoError(t, err)
+		assert.Equal(t, commonpb.ErrorCode_UnexpectedError, status.GetErrorCode())
+	})
+
+	t.Run("test add segment w/ closed server", func(t *testing.T) {
+		svr := newTestServer(t, nil)
+		closeTestServer(t, svr)
+
+		status, err := svr.AddSegment(context.TODO(), &datapb.AddSegmentRequest{})
+		assert.NoError(t, err)
+		assert.Equal(t, commonpb.ErrorCode_UnexpectedError, status.GetErrorCode())
+	})
+}
+
 // https://github.com/milvus-io/milvus/issues/15659
 func TestIssue15659(t *testing.T) {
 	ctx, cancel := context.WithCancel(context.Background())

internal/datacoord/services.go

@@ -331,12 +331,15 @@ func (s *Server) SaveBinlogPaths(ctx context.Context, req *datapb.SaveBinlogPath
 		return resp, nil
 	}
 
-	channel := segment.GetInsertChannel()
+	// No need to check import channel--node matching in data import case.
-	if !s.channelManager.Match(nodeID, channel) {
+	if !req.GetImporting() {
-		FailResponse(resp, fmt.Sprintf("channel %s is not watched on node %d", channel, nodeID))
+		channel := segment.GetInsertChannel()
-		resp.ErrorCode = commonpb.ErrorCode_MetaFailed
+		if !s.channelManager.Match(nodeID, channel) {
-		log.Warn("node is not matched with channel", zap.String("channel", channel), zap.Int64("nodeID", nodeID))
+			FailResponse(resp, fmt.Sprintf("channel %s is not watched on node %d", channel, nodeID))
-		return resp, nil
+			resp.ErrorCode = commonpb.ErrorCode_MetaFailed
+			log.Warn("node is not matched with channel", zap.String("channel", channel), zap.Int64("nodeID", nodeID))
+			return resp, nil
+		}
 	}
 
 	if req.GetDropped() {
@@ -1004,7 +1007,7 @@ func (s *Server) GetFlushState(ctx context.Context, req *milvuspb.GetFlushStateR
 // Import distributes the import tasks to dataNodes.
 // It returns a failed status if no dataNode is available or if any error occurs.
 func (s *Server) Import(ctx context.Context, itr *datapb.ImportTaskRequest) (*datapb.ImportTaskResponse, error) {
-	log.Info("DataCoord receive import request", zap.Any("import task request", itr))
+	log.Info("DataCoord receives import request", zap.Any("import task request", itr))
 	resp := &datapb.ImportTaskResponse{
 		Status: &commonpb.Status{
 			ErrorCode: commonpb.ErrorCode_UnexpectedError,
@@ -1012,14 +1015,14 @@ func (s *Server) Import(ctx context.Context, itr *datapb.ImportTaskRequest) (*da
 	}
 
 	if s.isClosed() {
-		log.Error("failed to import for closed dataCoord service")
+		log.Error("failed to import for closed DataCoord service")
 		resp.Status.Reason = msgDataCoordIsUnhealthy(Params.DataCoordCfg.GetNodeID())
 		return resp, nil
 	}
 
 	nodes := s.channelManager.store.GetNodes()
 	if len(nodes) == 0 {
-		log.Error("import failed as all dataNodes are offline")
+		log.Error("import failed as all DataNodes are offline")
 		return resp, nil
 	}
 
@@ -1033,7 +1036,7 @@ func (s *Server) Import(ctx context.Context, itr *datapb.ImportTaskRequest) (*da
 		s.cluster.Import(s.ctx, resp.GetDatanodeId(), itr)
 	} else {
 		// No dataNode is available, reject the import request.
-		msg := "all dataNodes are busy working on data import, the task has been rejected and wait for idle datanode"
+		msg := "all DataNodes are busy working on data import, the task has been rejected and wait for idle datanode"
 		log.Info(msg, zap.Int64("task ID", itr.GetImportTask().GetTaskId()))
 		resp.Status.Reason = msg
 		return resp, nil
@@ -1137,3 +1140,31 @@ func (s *Server) ReleaseSegmentLock(ctx context.Context, req *datapb.ReleaseSegm
 	resp.ErrorCode = commonpb.ErrorCode_Success
 	return resp, nil
 }
+
+func (s *Server) AddSegment(ctx context.Context, req *datapb.AddSegmentRequest) (*commonpb.Status, error) {
+	log.Info("DataCoord putting segment to the right DataNode",
+		zap.Int64("segment ID", req.GetSegmentId()),
+		zap.Int64("collection ID", req.GetCollectionId()),
+		zap.Int64("partition ID", req.GetPartitionId()),
+		zap.String("channel name", req.GetChannelName()),
+		zap.Int64("# of rows", req.GetRowNum()))
+	errResp := &commonpb.Status{
+		ErrorCode: commonpb.ErrorCode_UnexpectedError,
+		Reason:    "",
+	}
+	if s.isClosed() {
+		log.Warn("failed to add segment for closed server")
+		errResp.Reason = msgDataCoordIsUnhealthy(Params.DataCoordCfg.GetNodeID())
+		return errResp, nil
+	}
+	ok, nodeID := s.channelManager.getNodeIDByChannelName(req.GetChannelName())
+	if !ok {
+		log.Error("no DataNode found for channel", zap.String("channel name", req.GetChannelName()))
+		errResp.Reason = fmt.Sprint("no DataNode found for channel ", req.GetChannelName())
+		return errResp, nil
+	}
+	s.cluster.AddSegment(s.ctx, nodeID, req)
+	return &commonpb.Status{
+		ErrorCode: commonpb.ErrorCode_Success,
+	}, nil
+}

internal/datacoord/session_manager.go

@@ -33,8 +33,9 @@ import (
 const (
 	flushTimeout = 5 * time.Second
 	// TODO: evaluate and update import timeout.
-	importTimeout    = 3 * time.Hour
+	importTimeout     = 3 * time.Hour
-	reCollectTimeout = 5 * time.Second
+	reCollectTimeout  = 5 * time.Second
+	addSegmentTimeout = 30 * time.Second
 )
 
 // SessionManager provides the grpc interfaces of cluster
@@ -203,6 +204,29 @@ func (c *SessionManager) execReCollectSegmentStats(ctx context.Context, nodeID i
 	}
 }
 
+// AddSegment calls DataNode with ID == `nodeID` to put the segment into this node.
+func (c *SessionManager) AddSegment(ctx context.Context, nodeID int64, req *datapb.AddSegmentRequest) {
+	go c.execAddSegment(ctx, nodeID, req)
+}
+
+func (c *SessionManager) execAddSegment(ctx context.Context, nodeID int64, req *datapb.AddSegmentRequest) {
+	cli, err := c.getClient(ctx, nodeID)
+	if err != nil {
+		log.Warn("failed to get client for AddSegment", zap.Int64("DataNode ID", nodeID), zap.Error(err))
+		return
+	}
+	ctx, cancel := context.WithTimeout(ctx, addSegmentTimeout)
+	defer cancel()
+	req.Base.SourceID = Params.DataCoordCfg.GetNodeID()
+	resp, err := cli.AddSegment(ctx, req)
+	if err := VerifyResponse(resp, err); err != nil {
+		log.Warn("failed to add segment", zap.Int64("DataNode ID", nodeID), zap.Error(err))
+		return
+	}
+
+	log.Info("success to add segment", zap.Int64("DataNode ID", nodeID), zap.Any("add segment req", req))
+}
+
 func (c *SessionManager) getClient(ctx context.Context, nodeID int64) (types.DataNode, error) {
 	c.sessions.RLock()
 	session, ok := c.sessions.data[nodeID]

internal/datanode/data_node.go

@@ -102,7 +102,6 @@ var Params paramtable.ComponentParam
 type DataNode struct {
 	ctx    context.Context
 	cancel context.CancelFunc
-	NodeID UniqueID
 	Role   string
 	State  atomic.Value // internalpb.StateCode_Initializing
 
@@ -633,7 +632,7 @@ func (node *DataNode) FlushSegments(ctx context.Context, req *datapb.FlushSegmen
 // It returns a list of segments to be sent.
 func (node *DataNode) ResendSegmentStats(ctx context.Context, req *datapb.ResendSegmentStatsRequest) (*datapb.ResendSegmentStatsResponse, error) {
 	log.Info("start resending segment stats, if any",
-		zap.Int64("DataNode ID", node.NodeID))
+		zap.Int64("DataNode ID", Params.DataNodeCfg.GetNodeID()))
 	segResent := node.flowgraphManager.resendTT()
 	log.Info("found segment(s) with stats to resend",
 		zap.Int64s("segment IDs", segResent))
@@ -811,7 +810,7 @@ func (node *DataNode) Import(ctx context.Context, req *datapb.ImportTaskRequest)
 			ErrorCode: commonpb.ErrorCode_Success,
 		},
 		TaskId:     req.GetImportTask().TaskId,
-		DatanodeId: node.NodeID,
+		DatanodeId: Params.DataNodeCfg.GetNodeID(),
 		State:      commonpb.ImportState_ImportStarted,
 		Segments:   make([]int64, 0),
 		AutoIds:    make([]int64, 0),
@@ -843,7 +842,7 @@ func (node *DataNode) Import(ctx context.Context, req *datapb.ImportTaskRequest)
 			MsgType:   commonpb.MsgType_RequestTSO,
 			MsgID:     0,
 			Timestamp: 0,
-			SourceID:  node.NodeID,
+			SourceID:  Params.DataNodeCfg.GetNodeID(),
 		},
 		Count: 1,
 	})
@@ -865,7 +864,7 @@ func (node *DataNode) Import(ctx context.Context, req *datapb.ImportTaskRequest)
 	ts := rep.GetTimestamp()
 
 	metaService := newMetaService(node.rootCoord, req.GetImportTask().GetCollectionId())
-	schema, err := metaService.getCollectionSchema(ctx, req.GetImportTask().GetCollectionId(), 0)
+	colInfo, err := metaService.getCollectionInfo(ctx, req.GetImportTask().GetCollectionId(), 0)
 	if err != nil {
 		importResult.State = commonpb.ImportState_ImportFailed
 		importResult.Infos = append(importResult.Infos, &commonpb.KeyValuePair{Key: "failed_reason", Value: err.Error()})
@@ -882,8 +881,8 @@ func (node *DataNode) Import(ctx context.Context, req *datapb.ImportTaskRequest)
 	defer idAllocator.Close()
 
 	segmentSize := int64(Params.DataCoordCfg.SegmentMaxSize) * 1024 * 1024
-	importWrapper := importutil.NewImportWrapper(ctx, schema, 2, segmentSize, idAllocator, node.chunkManager,
+	importWrapper := importutil.NewImportWrapper(ctx, colInfo.GetSchema(), colInfo.GetShardsNum(), segmentSize, idAllocator, node.chunkManager,
-		importFlushReqFunc(node, req, importResult, schema, ts), importResult, reportFunc)
+		importFlushReqFunc(node, req, importResult, colInfo.GetSchema(), ts), importResult, reportFunc)
 	err = importWrapper.Import(req.GetImportTask().GetFiles(), req.GetImportTask().GetRowBased(), false)
 	if err != nil {
 		importResult.State = commonpb.ImportState_ImportFailed
@@ -901,6 +900,54 @@ func (node *DataNode) Import(ctx context.Context, req *datapb.ImportTaskRequest)
 	return resp, nil
 }
 
+// AddSegment adds the segment to the current DataNode.
+func (node *DataNode) AddSegment(ctx context.Context, req *datapb.AddSegmentRequest) (*commonpb.Status, error) {
+	log.Info("adding segment to DataNode flow graph",
+		zap.Int64("segment ID", req.GetSegmentId()),
+		zap.Int64("collection ID", req.GetCollectionId()),
+		zap.Int64("partition ID", req.GetPartitionId()),
+		zap.String("channel name", req.GetChannelName()),
+		zap.Int64("# of rows", req.GetRowNum()))
+	// Fetch the flow graph on the given v-channel.
+	ds, ok := node.flowgraphManager.getFlowgraphService(req.GetChannelName())
+	if !ok {
+		log.Error("channel not found in current DataNode",
+			zap.String("channel name", req.GetChannelName()),
+			zap.Int64("node ID", Params.DataNodeCfg.GetNodeID()))
+		return &commonpb.Status{
+			// TODO: Add specific error code.
+			ErrorCode: commonpb.ErrorCode_UnexpectedError,
+		}, nil
+	}
+	// Add the new segment to the replica.
+	if !ds.replica.hasSegment(req.GetSegmentId(), true) {
+		log.Info("add a new segment to replica")
+		err := ds.replica.addNewSegment(req.GetSegmentId(),
+			req.GetCollectionId(),
+			req.GetPartitionId(),
+			req.GetChannelName(),
+			&internalpb.MsgPosition{
+				ChannelName: req.GetChannelName(),
+			},
+			&internalpb.MsgPosition{
+				ChannelName: req.GetChannelName(),
+			})
+		if err != nil {
+			log.Error("failed to add segment to flow graph",
+				zap.Error(err))
+			return &commonpb.Status{
+				// TODO: Add specific error code.
+				ErrorCode: commonpb.ErrorCode_UnexpectedError,
+			}, nil
+		}
+	}
+	// Update # of rows of the given segment.
+	ds.replica.updateStatistics(req.GetSegmentId(), req.GetRowNum())
+	return &commonpb.Status{
+		ErrorCode: commonpb.ErrorCode_Success,
+	}, nil
+}
+
 func importFlushReqFunc(node *DataNode, req *datapb.ImportTaskRequest, res *rootcoordpb.ImportResult, schema *schemapb.CollectionSchema, ts Timestamp) importutil.ImportFlushFunc {
 	return func(fields map[storage.FieldID]storage.FieldData, shardNum int) error {
 		if shardNum >= len(req.GetImportTask().GetChannelNames()) {
@@ -1053,39 +1100,20 @@ func importFlushReqFunc(node *DataNode, req *datapb.ImportTaskRequest, res *root
 			fieldStats = append(fieldStats, &datapb.FieldBinlog{FieldID: k, Binlogs: []*datapb.Binlog{v}})
 		}
 
-		ds, ok := node.flowgraphManager.getFlowgraphService(segReqs[0].GetChannelName())
+		log.Info("now adding segment to the correct DataNode flow graph")
-		if !ok {
+		// Ask DataCoord to add segment to the corresponding DataNode flow graph.
-			log.Warn("channel not found in current dataNode",
+		node.dataCoord.AddSegment(context.Background(), &datapb.AddSegmentRequest{
-				zap.String("channel name", segReqs[0].GetChannelName()),
+			Base: &commonpb.MsgBase{
-				zap.Int64("node ID", node.NodeID))
+				SourceID: Params.DataNodeCfg.GetNodeID(),
-			return errors.New("channel " + segReqs[0].GetChannelName() + " not found in current dataNode")
+			},
-		}
+			SegmentId:    segmentID,
+			ChannelName:  segReqs[0].GetChannelName(),
+			CollectionId: req.GetImportTask().GetCollectionId(),
+			PartitionId:  req.GetImportTask().GetPartitionId(),
+			RowNum:       int64(rowNum),
+		})
 
-		// Update flow graph replica segment info.
+		binlogReq := &datapb.SaveBinlogPathsRequest{
-		// TODO: Duplicate code. Add wrapper function.
-		if !ds.replica.hasSegment(segmentID, true) {
-			err = ds.replica.addNewSegment(segmentID,
-				req.GetImportTask().GetCollectionId(),
-				req.GetImportTask().GetPartitionId(),
-				segReqs[0].GetChannelName(),
-				&internalpb.MsgPosition{
-					ChannelName: segReqs[0].GetChannelName(),
-				},
-				&internalpb.MsgPosition{
-					ChannelName: segReqs[0].GetChannelName(),
-				})
-			if err != nil {
-				log.Error("failed to add segment",
-					zap.Int64("segment ID", segmentID),
-					zap.Int64("collection ID", req.GetImportTask().GetCollectionId()),
-					zap.Int64("partition ID", req.GetImportTask().GetPartitionId()),
-					zap.String("channel mame", segReqs[0].GetChannelName()),
-					zap.Error(err))
-			}
-		}
-		ds.replica.updateStatistics(segmentID, int64(rowNum))
-
-		req := &datapb.SaveBinlogPathsRequest{
 			Base: &commonpb.MsgBase{
 				MsgType:   0, //TODO msg type
 				MsgID:     0, //TODO msg id
@@ -1093,14 +1121,14 @@ func importFlushReqFunc(node *DataNode, req *datapb.ImportTaskRequest, res *root
 				SourceID:  Params.DataNodeCfg.GetNodeID(),
 			},
 			SegmentID:           segmentID,
-			CollectionID:        req.ImportTask.GetCollectionId(),
+			CollectionID:        req.GetImportTask().GetCollectionId(),
 			Field2BinlogPaths:   fieldInsert,
 			Field2StatslogPaths: fieldStats,
 			Importing:           true,
 		}
 
 		err = retry.Do(context.Background(), func() error {
-			rsp, err := node.dataCoord.SaveBinlogPaths(context.Background(), req)
+			rsp, err := node.dataCoord.SaveBinlogPaths(context.Background(), binlogReq)
 			// should be network issue, return error and retry
 			if err != nil {
 				return fmt.Errorf(err.Error())

internal/datanode/data_node_test.go

@@ -495,6 +495,75 @@ func TestDataNode(t *testing.T) {
 	})
 }
 
+func TestDataNode_AddSegment(t *testing.T) {
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	node := newIDLEDataNodeMock(ctx, schemapb.DataType_Int64)
+	etcdCli, err := etcd.GetEtcdClient(&Params.EtcdCfg)
+	assert.Nil(t, err)
+	defer etcdCli.Close()
+	node.SetEtcdClient(etcdCli)
+	err = node.Init()
+	assert.Nil(t, err)
+	err = node.Start()
+	assert.Nil(t, err)
+	defer node.Stop()
+
+	node.chunkManager = storage.NewLocalChunkManager(storage.RootPath("/tmp/lib/milvus"))
+	Params.DataNodeCfg.SetNodeID(1)
+
+	t.Run("test AddSegment", func(t *testing.T) {
+		node.rootCoord = &RootCoordFactory{
+			collectionID: 100,
+			pkType:       schemapb.DataType_Int64,
+		}
+
+		chName1 := "fake-by-dev-rootcoord-dml-testaddsegment-1"
+		chName2 := "fake-by-dev-rootcoord-dml-testaddsegment-2"
+		err := node.flowgraphManager.addAndStart(node, &datapb.VchannelInfo{
+			CollectionID:      100,
+			ChannelName:       chName1,
+			UnflushedSegments: []*datapb.SegmentInfo{},
+			FlushedSegments:   []*datapb.SegmentInfo{},
+		})
+		require.Nil(t, err)
+		err = node.flowgraphManager.addAndStart(node, &datapb.VchannelInfo{
+			CollectionID:      100,
+			ChannelName:       chName2,
+			UnflushedSegments: []*datapb.SegmentInfo{},
+			FlushedSegments:   []*datapb.SegmentInfo{},
+		})
+		require.Nil(t, err)
+
+		_, ok := node.flowgraphManager.getFlowgraphService(chName1)
+		assert.True(t, ok)
+		_, ok = node.flowgraphManager.getFlowgraphService(chName2)
+		assert.True(t, ok)
+
+		stat, err := node.AddSegment(context.WithValue(ctx, ctxKey{}, ""), &datapb.AddSegmentRequest{
+			SegmentId:    100,
+			CollectionId: 100,
+			PartitionId:  100,
+			ChannelName:  chName1,
+			RowNum:       500,
+		})
+		assert.NoError(t, err)
+		assert.Equal(t, commonpb.ErrorCode_Success, stat.GetErrorCode())
+		assert.Equal(t, "", stat.GetReason())
+
+		stat, err = node.AddSegment(context.WithValue(ctx, ctxKey{}, ""), &datapb.AddSegmentRequest{
+			SegmentId:    100,
+			CollectionId: 100,
+			PartitionId:  100,
+			ChannelName:  "bad-ch-name",
+			RowNum:       500,
+		})
+		assert.NoError(t, err)
+		assert.Equal(t, commonpb.ErrorCode_UnexpectedError, stat.GetErrorCode())
+	})
+}
+
 func TestWatchChannel(t *testing.T) {
 	ctx, cancel := context.WithCancel(context.Background())
 	node := newIDLEDataNodeMock(ctx, schemapb.DataType_Int64)

internal/datanode/meta_service.go

@@ -46,6 +46,7 @@ func newMetaService(rc types.RootCoord, collectionID UniqueID) *metaService {
 	}
 }
 
+// TODO: Replace with getCollectionInfo below.
 // getCollectionSchema get collection schema with provided collection id at specified timestamp.
 func (mService *metaService) getCollectionSchema(ctx context.Context, collID UniqueID, timestamp Timestamp) (*schemapb.CollectionSchema, error) {
 	req := &milvuspb.DescribeCollectionRequest{
@@ -72,6 +73,32 @@ func (mService *metaService) getCollectionSchema(ctx context.Context, collID Uni
 	return response.GetSchema(), nil
 }
 
+// getCollectionInfo get collection info with provided collection id at specified timestamp.
+func (mService *metaService) getCollectionInfo(ctx context.Context, collID UniqueID, timestamp Timestamp) (*milvuspb.DescribeCollectionResponse, error) {
+	req := &milvuspb.DescribeCollectionRequest{
+		Base: &commonpb.MsgBase{
+			MsgType:   commonpb.MsgType_DescribeCollection,
+			MsgID:     0, //GOOSE TODO
+			Timestamp: 0, // GOOSE TODO
+			SourceID:  Params.DataNodeCfg.GetNodeID(),
+		},
+		DbName:       "default", // GOOSE TODO
+		CollectionID: collID,
+		TimeStamp:    timestamp,
+	}
+
+	response, err := mService.rootCoord.DescribeCollection(ctx, req)
+	if err != nil {
+		return nil, fmt.Errorf("grpc error when describe collection %v from rootcoord: %s", collID, err.Error())
+	}
+
+	if response.GetStatus().GetErrorCode() != commonpb.ErrorCode_Success {
+		return nil, fmt.Errorf("describe collection %v from rootcoord wrong: %s", collID, response.GetStatus().GetReason())
+	}
+
+	return response, nil
+}
+
 // printCollectionStruct util function to print schema data, used in tests only.
 func printCollectionStruct(obj *etcdpb.CollectionMeta) {
 	v := reflect.ValueOf(obj)

internal/datanode/mock_test.go

@@ -222,6 +222,12 @@ func (ds *DataCoordFactory) UpdateSegmentStatistics(ctx context.Context, req *da
 	}, nil
 }
 
+func (ds *DataCoordFactory) AddSegment(ctx context.Context, req *datapb.AddSegmentRequest) (*commonpb.Status, error) {
+	return &commonpb.Status{
+		ErrorCode: commonpb.ErrorCode_Success,
+	}, nil
+}
+
 func (mf *MetaFactory) GetCollectionMeta(collectionID UniqueID, collectionName string, pkDataType schemapb.DataType) *etcdpb.CollectionMeta {
 	sch := schemapb.CollectionSchema{
 		Name:        collectionName,
@@ -918,6 +924,7 @@ func (m *RootCoordFactory) DescribeCollection(ctx context.Context, in *milvuspb.
 
 	resp.CollectionID = m.collectionID
 	resp.Schema = meta.Schema
+	resp.ShardsNum = 2
 	resp.Status.ErrorCode = commonpb.ErrorCode_Success
 	return resp, nil
 }

internal/datanode/segment_replica.go

@@ -227,7 +227,7 @@ func (replica *SegmentReplica) normal2FlushedSegment(segID UniqueID) {
 	replica.flushedSegments[segID] = &seg
 
 	delete(replica.normalSegments, segID)
-	metrics.DataNodeNumUnflushedSegments.WithLabelValues(fmt.Sprint(Params.DataNodeCfg.NodeID)).Dec()
+	metrics.DataNodeNumUnflushedSegments.WithLabelValues(fmt.Sprint(Params.DataNodeCfg.GetNodeID())).Dec()
 }
 
 func (replica *SegmentReplica) getCollectionAndPartitionID(segID UniqueID) (collID, partitionID UniqueID, err error) {

internal/distributed/datacoord/client/client.go

@@ -559,3 +559,17 @@ func (c *Client) ReleaseSegmentLock(ctx context.Context, req *datapb.ReleaseSegm
 	}
 	return ret.(*commonpb.Status), err
 }
+
+// AddSegment is the DataCoord client side code for AddSegment call.
+func (c *Client) AddSegment(ctx context.Context, req *datapb.AddSegmentRequest) (*commonpb.Status, error) {
+	ret, err := c.grpcClient.ReCall(ctx, func(client interface{}) (interface{}, error) {
+		if !funcutil.CheckCtxValid(ctx) {
+			return nil, ctx.Err()
+		}
+		return client.(datapb.DataCoordClient).AddSegment(ctx, req)
+	})
+	if err != nil || ret == nil {
+		return nil, err
+	}
+	return ret.(*commonpb.Status), err
+}

internal/distributed/datacoord/client/client_test.go

@@ -135,6 +135,9 @@ func Test_NewClient(t *testing.T) {
 
 		r26, err := client.ReleaseSegmentLock(ctx, nil)
 		retCheck(retNotNil, r26, err)
+
+		r27, err := client.AddSegment(ctx, nil)
+		retCheck(retNotNil, r27, err)
 	}
 
 	client.grpcClient = &mock.GRPCClientBase{

internal/distributed/datacoord/service.go

@@ -350,3 +350,7 @@ func (s *Server) AcquireSegmentLock(ctx context.Context, req *datapb.AcquireSegm
 func (s *Server) ReleaseSegmentLock(ctx context.Context, req *datapb.ReleaseSegmentLockRequest) (*commonpb.Status, error) {
 	return s.dataCoord.ReleaseSegmentLock(ctx, req)
 }
+
+func (s *Server) AddSegment(ctx context.Context, request *datapb.AddSegmentRequest) (*commonpb.Status, error) {
+	return s.dataCoord.AddSegment(ctx, request)
+}

internal/distributed/datacoord/service_test.go

@@ -60,6 +60,7 @@ type MockDataCoord struct {
 	updateSegStatResp    *commonpb.Status
 	acquireSegLockResp   *commonpb.Status
 	releaseSegLockResp   *commonpb.Status
+	addSegmentResp       *commonpb.Status
 }
 
 func (m *MockDataCoord) Init() error {
@@ -189,6 +190,10 @@ func (m *MockDataCoord) ReleaseSegmentLock(ctx context.Context, req *datapb.Rele
 	return m.releaseSegLockResp, m.err
 }
 
+func (m *MockDataCoord) AddSegment(ctx context.Context, req *datapb.AddSegmentRequest) (*commonpb.Status, error) {
+	return m.addSegmentResp, m.err
+}
+
 ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 func Test_NewServer(t *testing.T) {
 	ctx := context.Background()
@@ -452,6 +457,17 @@ func Test_NewServer(t *testing.T) {
 		assert.NotNil(t, resp)
 	})
 
+	t.Run("add segment", func(t *testing.T) {
+		server.dataCoord = &MockDataCoord{
+			addSegmentResp: &commonpb.Status{
+				ErrorCode: commonpb.ErrorCode_Success,
+			},
+		}
+		resp, err := server.AddSegment(ctx, nil)
+		assert.Nil(t, err)
+		assert.NotNil(t, resp)
+	})
+
 	err := server.Stop()
 	assert.Nil(t, err)
 }

internal/distributed/datanode/client/client.go

@@ -211,3 +211,17 @@ func (c *Client) ResendSegmentStats(ctx context.Context, req *datapb.ResendSegme
 	}
 	return ret.(*datapb.ResendSegmentStatsResponse), err
 }
+
+// AddSegment is the DataNode client side code for AddSegment call.
+func (c *Client) AddSegment(ctx context.Context, req *datapb.AddSegmentRequest) (*commonpb.Status, error) {
+	ret, err := c.grpcClient.ReCall(ctx, func(client interface{}) (interface{}, error) {
+		if !funcutil.CheckCtxValid(ctx) {
+			return nil, ctx.Err()
+		}
+		return client.(datapb.DataNodeClient).AddSegment(ctx, req)
+	})
+	if err != nil || ret == nil {
+		return nil, err
+	}
+	return ret.(*commonpb.Status), err
+}

internal/distributed/datanode/client/client_test.go

@@ -82,6 +82,9 @@ func Test_NewClient(t *testing.T) {
 
 		r8, err := client.ResendSegmentStats(ctx, nil)
 		retCheck(retNotNil, r8, err)
+
+		r9, err := client.AddSegment(ctx, nil)
+		retCheck(retNotNil, r9, err)
 	}
 
 	client.grpcClient = &mock.GRPCClientBase{

internal/distributed/datanode/service.go

@@ -361,3 +361,7 @@ func (s *Server) Import(ctx context.Context, request *datapb.ImportTaskRequest)
 func (s *Server) ResendSegmentStats(ctx context.Context, request *datapb.ResendSegmentStatsRequest) (*datapb.ResendSegmentStatsResponse, error) {
 	return s.datanode.ResendSegmentStats(ctx, request)
 }
+
+func (s *Server) AddSegment(ctx context.Context, request *datapb.AddSegmentRequest) (*commonpb.Status, error) {
+	return s.datanode.AddSegment(ctx, request)
+}

internal/distributed/datanode/service_test.go

@@ -117,7 +117,11 @@ func (m *MockDataNode) Import(ctx context.Context, req *datapb.ImportTaskRequest
 }
 
 func (m *MockDataNode) ResendSegmentStats(ctx context.Context, req *datapb.ResendSegmentStatsRequest) (*datapb.ResendSegmentStatsResponse, error) {
-	return m.resendResp, nil
+	return m.resendResp, m.err
+}
+
+func (m *MockDataNode) AddSegment(ctx context.Context, req *datapb.AddSegmentRequest) (*commonpb.Status, error) {
+	return m.status, m.err
 }
 
 ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
@@ -273,6 +277,15 @@ func Test_NewServer(t *testing.T) {
 		assert.NotNil(t, resp)
 	})
 
+	t.Run("add segment", func(t *testing.T) {
+		server.datanode = &MockDataNode{
+			status: &commonpb.Status{},
+		}
+		resp, err := server.AddSegment(ctx, nil)
+		assert.Nil(t, err)
+		assert.NotNil(t, resp)
+	})
+
 	err = server.Stop()
 	assert.Nil(t, err)
 }

internal/distributed/proxy/service_test.go

@@ -438,6 +438,10 @@ func (m *MockDataCoord) Flush(ctx context.Context, req *datapb.FlushRequest) (*d
 	return nil, nil
 }
 
+func (m *MockDataCoord) AddSegment(ctx context.Context, req *datapb.AddSegmentRequest) (*commonpb.Status, error) {
+	return nil, nil
+}
+
 func (m *MockDataCoord) AssignSegmentID(ctx context.Context, req *datapb.AssignSegmentIDRequest) (*datapb.AssignSegmentIDResponse, error) {
 	return nil, nil
 }

internal/proto/data_coord.proto

@@ -52,6 +52,8 @@ service DataCoord {
 
   rpc AcquireSegmentLock(AcquireSegmentLockRequest) returns (common.Status) {}
   rpc ReleaseSegmentLock(ReleaseSegmentLockRequest) returns (common.Status) {}
+
+  rpc AddSegment(AddSegmentRequest) returns(common.Status) {}
 }
 
 service DataNode {
@@ -69,6 +71,8 @@ service DataNode {
   rpc Import(ImportTaskRequest) returns(common.Status) {}
 
   rpc ResendSegmentStats(ResendSegmentStatsRequest) returns(ResendSegmentStatsResponse) {}
+
+  rpc AddSegment(AddSegmentRequest) returns(common.Status) {}
 }
 
 message FlushRequest {
@@ -512,3 +516,12 @@ message ResendSegmentStatsResponse {
   common.Status status = 1;
   repeated int64 seg_resent = 2;
 }
+
+message AddSegmentRequest {
+  common.MsgBase base = 1;
+  int64 segment_id = 2;
+  string channel_name = 3;
+  int64 collection_id = 4;
+  int64 partition_id = 5;
+  int64 row_num = 6;
+}

internal/proto/datapb/data_coord.pb.go

@@ -3917,6 +3917,85 @@ func (m *ResendSegmentStatsResponse) GetSegResent() []int64 {
 	return nil
 }
 
+type AddSegmentRequest struct {
+	Base                 *commonpb.MsgBase `protobuf:"bytes,1,opt,name=base,proto3" json:"base,omitempty"`
+	SegmentId            int64             `protobuf:"varint,2,opt,name=segment_id,json=segmentId,proto3" json:"segment_id,omitempty"`
+	ChannelName          string            `protobuf:"bytes,3,opt,name=channel_name,json=channelName,proto3" json:"channel_name,omitempty"`
+	CollectionId         int64             `protobuf:"varint,4,opt,name=collection_id,json=collectionId,proto3" json:"collection_id,omitempty"`
+	PartitionId          int64             `protobuf:"varint,5,opt,name=partition_id,json=partitionId,proto3" json:"partition_id,omitempty"`
+	RowNum               int64             `protobuf:"varint,6,opt,name=row_num,json=rowNum,proto3" json:"row_num,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}          `json:"-"`
+	XXX_unrecognized     []byte            `json:"-"`
+	XXX_sizecache        int32             `json:"-"`
+}
+
+func (m *AddSegmentRequest) Reset()         { *m = AddSegmentRequest{} }
+func (m *AddSegmentRequest) String() string { return proto.CompactTextString(m) }
+func (*AddSegmentRequest) ProtoMessage()    {}
+func (*AddSegmentRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_82cd95f524594f49, []int{63}
+}
+
+func (m *AddSegmentRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_AddSegmentRequest.Unmarshal(m, b)
+}
+func (m *AddSegmentRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_AddSegmentRequest.Marshal(b, m, deterministic)
+}
+func (m *AddSegmentRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_AddSegmentRequest.Merge(m, src)
+}
+func (m *AddSegmentRequest) XXX_Size() int {
+	return xxx_messageInfo_AddSegmentRequest.Size(m)
+}
+func (m *AddSegmentRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_AddSegmentRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_AddSegmentRequest proto.InternalMessageInfo
+
+func (m *AddSegmentRequest) GetBase() *commonpb.MsgBase {
+	if m != nil {
+		return m.Base
+	}
+	return nil
+}
+
+func (m *AddSegmentRequest) GetSegmentId() int64 {
+	if m != nil {
+		return m.SegmentId
+	}
+	return 0
+}
+
+func (m *AddSegmentRequest) GetChannelName() string {
+	if m != nil {
+		return m.ChannelName
+	}
+	return ""
+}
+
+func (m *AddSegmentRequest) GetCollectionId() int64 {
+	if m != nil {
+		return m.CollectionId
+	}
+	return 0
+}
+
+func (m *AddSegmentRequest) GetPartitionId() int64 {
+	if m != nil {
+		return m.PartitionId
+	}
+	return 0
+}
+
+func (m *AddSegmentRequest) GetRowNum() int64 {
+	if m != nil {
+		return m.RowNum
+	}
+	return 0
+}
+
 func init() {
 	proto.RegisterEnum("milvus.proto.data.ChannelWatchState", ChannelWatchState_name, ChannelWatchState_value)
 	proto.RegisterEnum("milvus.proto.data.CompactionType", CompactionType_name, CompactionType_value)
@@ -3983,236 +4062,240 @@ func init() {
 	proto.RegisterType((*UpdateSegmentStatisticsRequest)(nil), "milvus.proto.data.UpdateSegmentStatisticsRequest")
 	proto.RegisterType((*ResendSegmentStatsRequest)(nil), "milvus.proto.data.ResendSegmentStatsRequest")
 	proto.RegisterType((*ResendSegmentStatsResponse)(nil), "milvus.proto.data.ResendSegmentStatsResponse")
+	proto.RegisterType((*AddSegmentRequest)(nil), "milvus.proto.data.AddSegmentRequest")
 }
 
 func init() { proto.RegisterFile("data_coord.proto", fileDescriptor_82cd95f524594f49) }
 
 var fileDescriptor_82cd95f524594f49 = []byte{
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-	0x19, 0x0f, 0x24, 0x06, 0xc5, 0xf4, 0xee, 0x5f, 0x3e, 0x76, 0xeb, 0xc6, 0xb7, 0x5e, 0xed, 0x19,
+	0x93, 0x6e, 0xe8, 0x01, 0xff, 0x7b, 0xb2, 0x08, 0xbc, 0x2f, 0xa5, 0x65, 0xec, 0xd1, 0x98, 0x3b,
-	0xde, 0xde, 0x70, 0x87, 0x88, 0x73, 0x9d, 0x11, 0xbf, 0x6c, 0xd8, 0xfc, 0xaf, 0xeb, 0xbe, 0x55,
+	0x81, 0xf0, 0x33, 0x8f, 0xb0, 0xf7, 0x00, 0x02, 0x11, 0x70, 0xfc, 0x47, 0x4c, 0xe2, 0xd4, 0x27,
-	0x5e, 0xa7, 0xfc, 0xae, 0x13, 0x7e, 0x83, 0x9d, 0x9d, 0x12, 0x5d, 0xdd, 0xf8, 0x5f, 0x00, 0x00,
+	0x31, 0xbc, 0x7e, 0x48, 0xbf, 0x31, 0x81, 0x9c, 0x43, 0xac, 0x2b, 0xda, 0xe6, 0x48, 0xb1, 0xae,
-	0x00, 0xff, 0xff, 0x6e, 0xe3, 0xdf, 0x9f, 0x70, 0x3e, 0x00, 0x00,
+	0x94, 0xe6, 0x4a, 0xa2, 0x9f, 0x4d, 0xef, 0x9d, 0x3c, 0x13, 0x7b, 0xbb, 0x75, 0xfd, 0x1b, 0xaf,
+	0xf7, 0x75, 0x77, 0x77, 0xb4, 0x4d, 0x56, 0xae, 0x31, 0xd0, 0x57, 0x75, 0x8b, 0xff, 0xba, 0xe6,
+	0x29, 0xfa, 0x35, 0x8a, 0x7d, 0x8d, 0xec, 0x31, 0xdc, 0xde, 0x2e, 0xd1, 0xd1, 0xf5, 0xff, 0x06,
+	0x00, 0x00, 0xff, 0xff, 0xe7, 0xa4, 0x10, 0xe3, 0x01, 0x40, 0x00, 0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -4256,6 +4339,7 @@ type DataCoordClient interface {
 	UpdateSegmentStatistics(ctx context.Context, in *UpdateSegmentStatisticsRequest, opts ...grpc.CallOption) (*commonpb.Status, error)
 	AcquireSegmentLock(ctx context.Context, in *AcquireSegmentLockRequest, opts ...grpc.CallOption) (*commonpb.Status, error)
 	ReleaseSegmentLock(ctx context.Context, in *ReleaseSegmentLockRequest, opts ...grpc.CallOption) (*commonpb.Status, error)
+	AddSegment(ctx context.Context, in *AddSegmentRequest, opts ...grpc.CallOption) (*commonpb.Status, error)
 }
 
 type dataCoordClient struct {
@@ -4509,6 +4593,15 @@ func (c *dataCoordClient) ReleaseSegmentLock(ctx context.Context, in *ReleaseSeg
 	return out, nil
 }
 
+func (c *dataCoordClient) AddSegment(ctx context.Context, in *AddSegmentRequest, opts ...grpc.CallOption) (*commonpb.Status, error) {
+	out := new(commonpb.Status)
+	err := c.cc.Invoke(ctx, "/milvus.proto.data.DataCoord/AddSegment", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // DataCoordServer is the server API for DataCoord service.
 type DataCoordServer interface {
 	GetComponentStates(context.Context, *internalpb.GetComponentStatesRequest) (*internalpb.ComponentStates, error)
@@ -4540,6 +4633,7 @@ type DataCoordServer interface {
 	UpdateSegmentStatistics(context.Context, *UpdateSegmentStatisticsRequest) (*commonpb.Status, error)
 	AcquireSegmentLock(context.Context, *AcquireSegmentLockRequest) (*commonpb.Status, error)
 	ReleaseSegmentLock(context.Context, *ReleaseSegmentLockRequest) (*commonpb.Status, error)
+	AddSegment(context.Context, *AddSegmentRequest) (*commonpb.Status, error)
 }
 
 // UnimplementedDataCoordServer can be embedded to have forward compatible implementations.
@@ -4627,6 +4721,9 @@ func (*UnimplementedDataCoordServer) AcquireSegmentLock(ctx context.Context, req
 func (*UnimplementedDataCoordServer) ReleaseSegmentLock(ctx context.Context, req *ReleaseSegmentLockRequest) (*commonpb.Status, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method ReleaseSegmentLock not implemented")
 }
+func (*UnimplementedDataCoordServer) AddSegment(ctx context.Context, req *AddSegmentRequest) (*commonpb.Status, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method AddSegment not implemented")
+}
 
 func RegisterDataCoordServer(s *grpc.Server, srv DataCoordServer) {
 	s.RegisterService(&_DataCoord_serviceDesc, srv)
@@ -5118,6 +5215,24 @@ func _DataCoord_ReleaseSegmentLock_Handler(srv interface{}, ctx context.Context,
 	return interceptor(ctx, in, info, handler)
 }
 
+func _DataCoord_AddSegment_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(AddSegmentRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(DataCoordServer).AddSegment(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/milvus.proto.data.DataCoord/AddSegment",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(DataCoordServer).AddSegment(ctx, req.(*AddSegmentRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 var _DataCoord_serviceDesc = grpc.ServiceDesc{
 	ServiceName: "milvus.proto.data.DataCoord",
 	HandlerType: (*DataCoordServer)(nil),
@@ -5230,6 +5345,10 @@ var _DataCoord_serviceDesc = grpc.ServiceDesc{
 			MethodName: "ReleaseSegmentLock",
 			Handler:    _DataCoord_ReleaseSegmentLock_Handler,
 		},
+		{
+			MethodName: "AddSegment",
+			Handler:    _DataCoord_AddSegment_Handler,
+		},
 	},
 	Streams:  []grpc.StreamDesc{},
 	Metadata: "data_coord.proto",
@@ -5249,6 +5368,7 @@ type DataNodeClient interface {
 	// https://wiki.lfaidata.foundation/display/MIL/MEP+24+--+Support+bulk+load
 	Import(ctx context.Context, in *ImportTaskRequest, opts ...grpc.CallOption) (*commonpb.Status, error)
 	ResendSegmentStats(ctx context.Context, in *ResendSegmentStatsRequest, opts ...grpc.CallOption) (*ResendSegmentStatsResponse, error)
+	AddSegment(ctx context.Context, in *AddSegmentRequest, opts ...grpc.CallOption) (*commonpb.Status, error)
 }
 
 type dataNodeClient struct {
@@ -5331,6 +5451,15 @@ func (c *dataNodeClient) ResendSegmentStats(ctx context.Context, in *ResendSegme
 	return out, nil
 }
 
+func (c *dataNodeClient) AddSegment(ctx context.Context, in *AddSegmentRequest, opts ...grpc.CallOption) (*commonpb.Status, error) {
+	out := new(commonpb.Status)
+	err := c.cc.Invoke(ctx, "/milvus.proto.data.DataNode/AddSegment", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // DataNodeServer is the server API for DataNode service.
 type DataNodeServer interface {
 	GetComponentStates(context.Context, *internalpb.GetComponentStatesRequest) (*internalpb.ComponentStates, error)
@@ -5343,6 +5472,7 @@ type DataNodeServer interface {
 	// https://wiki.lfaidata.foundation/display/MIL/MEP+24+--+Support+bulk+load
 	Import(context.Context, *ImportTaskRequest) (*commonpb.Status, error)
 	ResendSegmentStats(context.Context, *ResendSegmentStatsRequest) (*ResendSegmentStatsResponse, error)
+	AddSegment(context.Context, *AddSegmentRequest) (*commonpb.Status, error)
 }
 
 // UnimplementedDataNodeServer can be embedded to have forward compatible implementations.
@@ -5373,6 +5503,9 @@ func (*UnimplementedDataNodeServer) Import(ctx context.Context, req *ImportTaskR
 func (*UnimplementedDataNodeServer) ResendSegmentStats(ctx context.Context, req *ResendSegmentStatsRequest) (*ResendSegmentStatsResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method ResendSegmentStats not implemented")
 }
+func (*UnimplementedDataNodeServer) AddSegment(ctx context.Context, req *AddSegmentRequest) (*commonpb.Status, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method AddSegment not implemented")
+}
 
 func RegisterDataNodeServer(s *grpc.Server, srv DataNodeServer) {
 	s.RegisterService(&_DataNode_serviceDesc, srv)
@@ -5522,6 +5655,24 @@ func _DataNode_ResendSegmentStats_Handler(srv interface{}, ctx context.Context,
 	return interceptor(ctx, in, info, handler)
 }
 
+func _DataNode_AddSegment_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(AddSegmentRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(DataNodeServer).AddSegment(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/milvus.proto.data.DataNode/AddSegment",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(DataNodeServer).AddSegment(ctx, req.(*AddSegmentRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 var _DataNode_serviceDesc = grpc.ServiceDesc{
 	ServiceName: "milvus.proto.data.DataNode",
 	HandlerType: (*DataNodeServer)(nil),
@@ -5558,6 +5709,10 @@ var _DataNode_serviceDesc = grpc.ServiceDesc{
 			MethodName: "ResendSegmentStats",
 			Handler:    _DataNode_ResendSegmentStats_Handler,
 		},
+		{
+			MethodName: "AddSegment",
+			Handler:    _DataNode_AddSegment_Handler,
+		},
 	},
 	Streams:  []grpc.StreamDesc{},
 	Metadata: "data_coord.proto",

internal/proxy/data_coord_mock_test.go

@@ -114,6 +114,10 @@ func (coord *DataCoordMock) Flush(ctx context.Context, req *datapb.FlushRequest)
 	panic("implement me")
 }
 
+func (coord *DataCoordMock) AddSegment(ctx context.Context, req *datapb.AddSegmentRequest) (*commonpb.Status, error) {
+	panic("implement me")
+}
+
 func (coord *DataCoordMock) AssignSegmentID(ctx context.Context, req *datapb.AssignSegmentIDRequest) (*datapb.AssignSegmentIDResponse, error) {
 	panic("implement me")
 }

internal/querynode/segment_loader_test.go

@@ -23,9 +23,6 @@ import (
 	"runtime"
 	"testing"
 
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/mock"
-
 	"github.com/milvus-io/milvus/internal/common"
 	"github.com/milvus-io/milvus/internal/mq/msgstream"
 	"github.com/milvus-io/milvus/internal/proto/commonpb"
@@ -34,6 +31,8 @@ import (
 	"github.com/milvus-io/milvus/internal/proto/schemapb"
 	"github.com/milvus-io/milvus/internal/storage"
 	"github.com/milvus-io/milvus/internal/util/funcutil"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/mock"
 )
 
 func TestSegmentLoader_loadSegment(t *testing.T) {

internal/types/types.go

@@ -81,6 +81,9 @@ type DataNode interface {
 	// ResendSegmentStats resend un-flushed segment stats back upstream to DataCoord by resending DataNode time tick message.
 	// It returns a list of segments to be sent.
 	ResendSegmentStats(ctx context.Context, req *datapb.ResendSegmentStatsRequest) (*datapb.ResendSegmentStatsResponse, error)
+
+	// AddSegment puts the given segment to current DataNode's flow graph.
+	AddSegment(ctx context.Context, req *datapb.AddSegmentRequest) (*commonpb.Status, error)
 }
 
 // DataNodeComponent is used by grpc server of DataNode
@@ -284,6 +287,10 @@ type DataCoord interface {
 
 	AcquireSegmentLock(ctx context.Context, req *datapb.AcquireSegmentLockRequest) (*commonpb.Status, error)
 	ReleaseSegmentLock(ctx context.Context, req *datapb.ReleaseSegmentLockRequest) (*commonpb.Status, error)
+
+	// AddSegment looks for the right DataNode given channel name, and triggers AddSegment call on that DataNode to
+	// add the segment into this DataNode.
+	AddSegment(ctx context.Context, req *datapb.AddSegmentRequest) (*commonpb.Status, error)
 }
 
 // DataCoordComponent defines the interface of DataCoord component.

internal/util/mock/grpc_datacoord_client.go

@@ -140,3 +140,7 @@ func (m *GrpcDataCoordClient) AcquireSegmentLock(ctx context.Context, req *datap
 func (m *GrpcDataCoordClient) ReleaseSegmentLock(ctx context.Context, req *datapb.ReleaseSegmentLockRequest, opts ...grpc.CallOption) (*commonpb.Status, error) {
 	return &commonpb.Status{}, m.Err
 }
+
+func (m *GrpcDataCoordClient) AddSegment(ctx context.Context, in *datapb.AddSegmentRequest, opts ...grpc.CallOption) (*commonpb.Status, error) {
+	return &commonpb.Status{}, m.Err
+}

internal/util/mock/grpc_datanode_client.go

@@ -64,3 +64,7 @@ func (m *GrpcDataNodeClient) Import(ctx context.Context, req *datapb.ImportTaskR
 func (m *GrpcDataNodeClient) ResendSegmentStats(ctx context.Context, req *datapb.ResendSegmentStatsRequest, opts ...grpc.CallOption) (*datapb.ResendSegmentStatsResponse, error) {
 	return &datapb.ResendSegmentStatsResponse{}, m.Err
 }
+
+func (m *GrpcDataNodeClient) AddSegment(ctx context.Context, in *datapb.AddSegmentRequest, opts ...grpc.CallOption) (*commonpb.Status, error) {
+	return &commonpb.Status{}, m.Err
+}