DataService publishes flush-completed message into its channel (#5320)

DataService publishes flush-completed message  into related msgstream

See also: #5220 
Signed-off-by: NCongqi Xia <congqi.xia@zilliz.com>

internal/dataservice/server.go

@@ -70,6 +70,7 @@ type Server struct {
 		name string
 	}
 	segmentInfoStream    msgstream.MsgStream
+	flushMsgStream       msgstream.MsgStream
 	insertChannels       []string
 	msFactory            msgstream.Factory
 	ttBarrier            timesync.TimeTickBarrier
@@ -194,6 +195,15 @@ func (s *Server) initMsgProducer() error {
 		return err
 	}
 	s.msgProducer.Start(s.ctx)
+	// segment flush stream
+	s.flushMsgStream, err = s.msFactory.NewMsgStream(s.ctx)
+	if err != nil {
+		return err
+	}
+	s.flushMsgStream.AsProducer([]string{Params.SegmentInfoChannelName})
+	log.Debug("dataservice AsProducer:" + Params.SegmentInfoChannelName)
+	s.flushMsgStream.Start()
+
 	return nil
 }
 
@@ -891,6 +901,10 @@ func (s *Server) SaveBinlogPaths(ctx context.Context, req *datapb.SaveBinlogPath
 		resp.Reason = "server is initializing"
 		return resp, nil
 	}
+	if s.flushMsgStream == nil {
+		resp.Reason = "flush msg stream nil"
+		return resp, nil
+	}
 
 	// check segment id & collection id matched
 	_, err := s.meta.GetCollection(req.GetCollectionID())
@@ -926,12 +940,44 @@ func (s *Server) SaveBinlogPaths(ctx context.Context, req *datapb.SaveBinlogPath
 	for k, v := range ddlMeta {
 		meta[k] = v
 	}
+	// Save into k-v store
 	err = s.SaveBinLogMetaTxn(meta)
 	if err != nil {
 		resp.Reason = err.Error()
 		return resp, err
 	}
+	// write flush msg into segmentInfo/flush stream
+	msgPack := composeSegmentFlushMsgPack(req.SegmentID)
+	err = s.flushMsgStream.Produce(&msgPack)
+	if err != nil {
+		resp.Reason = err.Error()
+		return resp, err
+	}
 
 	resp.ErrorCode = commonpb.ErrorCode_Success
 	return resp, nil
 }
+
+func composeSegmentFlushMsgPack(segmentID UniqueID) msgstream.MsgPack {
+	msgPack := msgstream.MsgPack{
+		Msgs: make([]msgstream.TsMsg, 0, 1),
+	}
+	completeFlushMsg := internalpb.SegmentFlushCompletedMsg{
+		Base: &commonpb.MsgBase{
+			MsgType:   commonpb.MsgType_SegmentFlushDone,
+			MsgID:     0, // TODO
+			Timestamp: 0, // TODO
+			SourceID:  Params.NodeID,
+		},
+		SegmentID: segmentID,
+	}
+	var msg msgstream.TsMsg = &msgstream.FlushCompletedMsg{
+		BaseMsg: msgstream.BaseMsg{
+			HashValues: []uint32{0},
+		},
+		SegmentFlushCompletedMsg: completeFlushMsg,
+	}
+
+	msgPack.Msgs = append(msgPack.Msgs, msg)
+	return msgPack
+}

internal/dataservice/server_test.go

@@ -525,6 +525,9 @@ func TestSaveBinlogPaths(t *testing.T) {
 	t.Run("Normal SaveRequest", func(t *testing.T) {
 		ctx := context.Background()
 		resp, err := svr.SaveBinlogPaths(ctx, &datapb.SaveBinlogPathsRequest{
+			Base: &commonpb.MsgBase{
+				Timestamp: uint64(time.Now().Unix()),
+			},
 			SegmentID:    2,
 			CollectionID: 0,
 			Field2BinlogPaths: &datapb.ID2PathList{