diff --git a/internal/datacoord/server.go b/internal/datacoord/server.go
index 5695276472..490b6ce08b 100644
--- a/internal/datacoord/server.go
+++ b/internal/datacoord/server.go
@@ -312,54 +312,54 @@ func (s *Server) initMeta() error {
 func (s *Server) startServerLoop() {
 	s.serverLoopCtx, s.serverLoopCancel = context.WithCancel(s.ctx)
 	s.serverLoopWg.Add(4)
-	go s.startStatsChannel(s.serverLoopCtx)
-	go s.startDataNodeTtLoop(s.serverLoopCtx)
-	go s.startWatchService(s.serverLoopCtx)
-	go s.startFlushLoop(s.serverLoopCtx)
+	s.startStatsChannel(s.serverLoopCtx)
+	s.startDataNodeTtLoop(s.serverLoopCtx)
+	s.startWatchService(s.serverLoopCtx)
+	s.startFlushLoop(s.serverLoopCtx)
 	go s.session.LivenessCheck(s.serverLoopCtx, func() {
 		log.Fatal("Data Coord disconnected from etcd, process will exit", zap.Int64("Server Id", s.session.ServerID))
 	})
 }
 
 func (s *Server) startStatsChannel(ctx context.Context) {
-	defer logutil.LogPanic()
-	defer s.serverLoopWg.Done()
 	statsStream, _ := s.msFactory.NewMsgStream(ctx)
 	statsStream.AsConsumer([]string{Params.StatisticsChannelName}, Params.DataCoordSubscriptionName)
 	log.Debug("dataCoord create stats channel consumer",
 		zap.String("channelName", Params.StatisticsChannelName),
 		zap.String("descriptionName", Params.DataCoordSubscriptionName))
 	statsStream.Start()
-	defer statsStream.Close()
-	for {
-		select {
-		case <-ctx.Done():
-			log.Debug("stats channel shutdown")
-			return
-		default:
-		}
-		msgPack := statsStream.Consume()
-		if msgPack == nil {
-			log.Debug("receive nil stats msg, shutdown stats channel")
-			return
-		}
-		for _, msg := range msgPack.Msgs {
-			if msg.Type() != commonpb.MsgType_SegmentStatistics {
-				log.Warn("receive unknown msg from segment statistics channel",
-					zap.Stringer("msgType", msg.Type()))
-				continue
+	go func() {
+		defer logutil.LogPanic()
+		defer s.serverLoopWg.Done()
+		defer statsStream.Close()
+		for {
+			select {
+			case <-ctx.Done():
+				log.Debug("stats channel shutdown")
+				return
+			default:
 			}
-			ssMsg := msg.(*msgstream.SegmentStatisticsMsg)
-			for _, stat := range ssMsg.SegStats {
-				s.meta.SetCurrentRows(stat.GetSegmentID(), stat.GetNumRows())
+			msgPack := statsStream.Consume()
+			if msgPack == nil {
+				log.Debug("receive nil stats msg, shutdown stats channel")
+				return
+			}
+			for _, msg := range msgPack.Msgs {
+				if msg.Type() != commonpb.MsgType_SegmentStatistics {
+					log.Warn("receive unknown msg from segment statistics channel",
+						zap.Stringer("msgType", msg.Type()))
+					continue
+				}
+				ssMsg := msg.(*msgstream.SegmentStatisticsMsg)
+				for _, stat := range ssMsg.SegStats {
+					s.meta.SetCurrentRows(stat.GetSegmentID(), stat.GetNumRows())
+				}
 			}
 		}
-	}
+	}()
 }
 
 func (s *Server) startDataNodeTtLoop(ctx context.Context) {
-	defer logutil.LogPanic()
-	defer s.serverLoopWg.Done()
 	ttMsgStream, err := s.msFactory.NewMsgStream(ctx)
 	if err != nil {
 		log.Error("new msg stream failed", zap.Error(err))
@@ -371,97 +371,103 @@ func (s *Server) startDataNodeTtLoop(ctx context.Context) {
 		zap.String("timeTickChannelName", Params.TimeTickChannelName),
 		zap.String("subscriptionName", Params.DataCoordSubscriptionName))
 	ttMsgStream.Start()
-	defer ttMsgStream.Close()
 
-	var checker *LongTermChecker
-	if enableTtChecker {
-		checker = NewLongTermChecker(ctx, ttCheckerName, ttMaxInterval, ttCheckerWarnMsg)
-		checker.Start()
-		defer checker.Stop()
-	}
-	for {
-		select {
-		case <-ctx.Done():
-			log.Debug("data node tt loop shutdown")
-			return
-		default:
+	go func() {
+		var checker *LongTermChecker
+		if enableTtChecker {
+			checker = NewLongTermChecker(ctx, ttCheckerName, ttMaxInterval, ttCheckerWarnMsg)
+			checker.Start()
+			defer checker.Stop()
 		}
-		msgPack := ttMsgStream.Consume()
-		if msgPack == nil {
-			log.Debug("receive nil tt msg, shutdown tt channel")
-			return
-		}
-		for _, msg := range msgPack.Msgs {
-			if msg.Type() != commonpb.MsgType_DataNodeTt {
-				log.Warn("receive unexpected msg type from tt channel",
-					zap.Stringer("msgType", msg.Type()))
-				continue
+		defer logutil.LogPanic()
+		defer s.serverLoopWg.Done()
+		defer ttMsgStream.Close()
+		for {
+			select {
+			case <-ctx.Done():
+				log.Debug("data node tt loop shutdown")
+				return
+			default:
 			}
-			ttMsg := msg.(*msgstream.DataNodeTtMsg)
-			if enableTtChecker {
-				checker.Check()
+			msgPack := ttMsgStream.Consume()
+			if msgPack == nil {
+				log.Debug("receive nil tt msg, shutdown tt channel")
+				return
 			}
-
-			ch := ttMsg.ChannelName
-			ts := ttMsg.Timestamp
-			if err := s.segmentManager.ExpireAllocations(ch, ts); err != nil {
-				log.Warn("failed to expire allocations", zap.Error(err))
-				continue
-			}
-			physical, _ := tsoutil.ParseTS(ts)
-			if time.Since(physical).Minutes() > 1 {
-				// if lag behind, log every 1 mins about
-				log.RatedWarn(60.0, "Time tick lag behind for more than 1 minutes", zap.String("channel", ch), zap.Time("tt", physical))
-			}
-			segments, err := s.segmentManager.GetFlushableSegments(ctx, ch, ts)
-			if err != nil {
-				log.Warn("get flushable segments failed", zap.Error(err))
-				continue
-			}
-
-			staleSegments := s.meta.SelectSegments(func(info *SegmentInfo) bool {
-				return !info.lastFlushTime.IsZero() && time.Since(info.lastFlushTime).Minutes() >= segmentTimedFlushDuration
-			})
-
-			if len(segments)+len(staleSegments) == 0 {
-				continue
-			}
-			log.Debug("flush segments", zap.Int64s("segmentIDs", segments), zap.Int("markSegments count", len(staleSegments)))
-			segmentInfos := make([]*datapb.SegmentInfo, 0, len(segments))
-			for _, id := range segments {
-				sInfo := s.meta.GetSegment(id)
-				if sInfo == nil {
-					log.Error("get segment from meta error", zap.Int64("id", id),
-						zap.Error(err))
+			for _, msg := range msgPack.Msgs {
+				if msg.Type() != commonpb.MsgType_DataNodeTt {
+					log.Warn("receive unexpected msg type from tt channel",
+						zap.Stringer("msgType", msg.Type()))
 					continue
 				}
-				segmentInfos = append(segmentInfos, sInfo.SegmentInfo)
-				s.meta.SetLastFlushTime(id, time.Now())
-			}
-			markSegments := make([]*datapb.SegmentInfo, 0, len(staleSegments))
-			for _, segment := range staleSegments {
-				for _, fSeg := range segmentInfos {
-					// check segment needs flush first
-					if segment.GetID() == fSeg.GetID() {
+				ttMsg := msg.(*msgstream.DataNodeTtMsg)
+				if enableTtChecker {
+					checker.Check()
+				}
+
+				ch := ttMsg.ChannelName
+				ts := ttMsg.Timestamp
+				if err := s.segmentManager.ExpireAllocations(ch, ts); err != nil {
+					log.Warn("failed to expire allocations", zap.Error(err))
+					continue
+				}
+				physical, _ := tsoutil.ParseTS(ts)
+				if time.Since(physical).Minutes() > 1 {
+					// if lag behind, log every 1 mins about
+					log.RatedWarn(60.0, "Time tick lag behind for more than 1 minutes", zap.String("channel", ch), zap.Time("tt", physical))
+				}
+				segments, err := s.segmentManager.GetFlushableSegments(ctx, ch, ts)
+				if err != nil {
+					log.Warn("get flushable segments failed", zap.Error(err))
+					continue
+				}
+
+				staleSegments := s.meta.SelectSegments(func(info *SegmentInfo) bool {
+					return !info.lastFlushTime.IsZero() && time.Since(info.lastFlushTime).Minutes() >= segmentTimedFlushDuration
+				})
+
+				if len(segments)+len(staleSegments) == 0 {
+					continue
+				}
+				log.Debug("flush segments", zap.Int64s("segmentIDs", segments), zap.Int("markSegments count", len(staleSegments)))
+				segmentInfos := make([]*datapb.SegmentInfo, 0, len(segments))
+				for _, id := range segments {
+					sInfo := s.meta.GetSegment(id)
+					if sInfo == nil {
+						log.Error("get segment from meta error", zap.Int64("id", id),
+							zap.Error(err))
 						continue
 					}
+					segmentInfos = append(segmentInfos, sInfo.SegmentInfo)
+					s.meta.SetLastFlushTime(id, time.Now())
+				}
+				markSegments := make([]*datapb.SegmentInfo, 0, len(staleSegments))
+				for _, segment := range staleSegments {
+					for _, fSeg := range segmentInfos {
+						// check segment needs flush first
+						if segment.GetID() == fSeg.GetID() {
+							continue
+						}
+					}
+					markSegments = append(markSegments, segment.SegmentInfo)
+					s.meta.SetLastFlushTime(segment.GetID(), time.Now())
+				}
+				if len(segmentInfos)+len(markSegments) > 0 {
+					s.cluster.Flush(s.ctx, segmentInfos, markSegments)
 				}
-				markSegments = append(markSegments, segment.SegmentInfo)
-				s.meta.SetLastFlushTime(segment.GetID(), time.Now())
-			}
-			if len(segmentInfos)+len(markSegments) > 0 {
-				s.cluster.Flush(s.ctx, segmentInfos, markSegments)
 			}
+			s.helper.eventAfterHandleDataNodeTt()
 		}
-		s.helper.eventAfterHandleDataNodeTt()
-	}
+	}()
 }
 
-//go:norace
-// fix datarace in unittest
-// startWatchService will only be invoked at start procedure
-// otherwise, remove the annotation and add atomic protection
+// start a goroutine wto watch services
 func (s *Server) startWatchService(ctx context.Context) {
+	go s.watchService(ctx)
+}
+
+// watchService watchs services
+func (s *Server) watchService(ctx context.Context) {
 	defer logutil.LogPanic()
 	defer s.serverLoopWg.Done()
 	for {
@@ -484,6 +490,7 @@ func (s *Server) startWatchService(ctx context.Context) {
 			}
 		}
 	}
+
 }
 
 // handles session events - DataNodes Add/Del
@@ -527,22 +534,24 @@ func (s *Server) handleSessionEvent(ctx context.Context, event *sessionutil.Sess
 }
 
 func (s *Server) startFlushLoop(ctx context.Context) {
-	defer logutil.LogPanic()
-	defer s.serverLoopWg.Done()
-	ctx2, cancel := context.WithCancel(ctx)
-	defer cancel()
-	// send `Flushing` segments
-	go s.handleFlushingSegments(ctx2)
-	for {
-		select {
-		case <-ctx.Done():
-			log.Debug("flush loop shutdown")
-			return
-		case segmentID := <-s.flushCh:
-			//Ignore return error
-			_ = s.postFlush(ctx, segmentID)
+	go func() {
+		defer logutil.LogPanic()
+		defer s.serverLoopWg.Done()
+		ctx2, cancel := context.WithCancel(ctx)
+		defer cancel()
+		// send `Flushing` segments
+		go s.handleFlushingSegments(ctx2)
+		for {
+			select {
+			case <-ctx.Done():
+				log.Debug("flush loop shutdown")
+				return
+			case segmentID := <-s.flushCh:
+				//Ignore return error
+				_ = s.postFlush(ctx, segmentID)
+			}
 		}
-	}
+	}()
 }
 
 // post function after flush is done
diff --git a/internal/datacoord/server_test.go b/internal/datacoord/server_test.go
index 9cae21e78f..8f29c5f305 100644
--- a/internal/datacoord/server_test.go
+++ b/internal/datacoord/server_test.go
@@ -592,7 +592,7 @@ func TestService_WatchServices(t *testing.T) {
 	signal := make(chan struct{}, 1)
 
 	go func() {
-		svr.startWatchService(context.Background())
+		svr.watchService(context.Background())
 		flag = true
 		signal <- struct{}{}
 	}()
@@ -609,7 +609,7 @@ func TestService_WatchServices(t *testing.T) {
 	svr.serverLoopWg.Add(1)
 
 	go func() {
-		svr.startWatchService(ctx)
+		svr.watchService(ctx)
 		flag = true
 		signal <- struct{}{}
 	}()
diff --git a/internal/util/mqclient/pulsar_client.go b/internal/util/mqclient/pulsar_client.go
index e5ae08a61f..2c5d67044f 100644
--- a/internal/util/mqclient/pulsar_client.go
+++ b/internal/util/mqclient/pulsar_client.go
@@ -67,9 +67,12 @@ func (pc *pulsarClient) Subscribe(options ConsumerOptions) (Consumer, error) {
 	if err != nil {
 		return nil, err
 	}
-	//consumer.Seek(pulsar.EarliestMessageID())
-	//consumer.SeekByTime(time.Unix(0, 0))
+
 	pConsumer := &pulsarConsumer{c: consumer, closeCh: make(chan struct{})}
+	// prevent seek to earliest patch applied when using latest position options
+	if options.SubscriptionInitialPosition == SubscriptionPositionLatest {
+		pConsumer.hasSeek = true
+	}
 
 	return pConsumer, nil
 }