diff --git a/internal/querycoord/task.go b/internal/querycoord/task.go
index decb8e35f0b54d8a81145a3aafb551e9838068ce..525216da7858494963c328f2c920dea06f2957ad 100644
--- a/internal/querycoord/task.go
+++ b/internal/querycoord/task.go
@@ -408,12 +408,10 @@ func (lct *loadCollectionTask) execute(ctx context.Context) error {
 
 		if len(watchDeltaChannels) != len(recoveryInfo.Channels) {
 			for _, info := range recoveryInfo.Channels {
-				deltaChannelName, err := rootcoord.ConvertChannelName(info.ChannelName, Params.DmlChannelPrefix, Params.DeltaChannelPrefix)
+				deltaChannel, err := generateWatchDeltaChannelInfo(info)
 				if err != nil {
 					return err
 				}
-				deltaChannel := proto.Clone(info).(*datapb.VchannelInfo)
-				deltaChannel.ChannelName = deltaChannelName
 				watchDeltaChannels = append(watchDeltaChannels, deltaChannel)
 			}
 		}
@@ -775,12 +773,10 @@ func (lpt *loadPartitionTask) execute(ctx context.Context) error {
 
 		if len(watchDeltaChannels) != len(recoveryInfo.Channels) {
 			for _, info := range recoveryInfo.Channels {
-				deltaChannelName, err := rootcoord.ConvertChannelName(info.ChannelName, Params.DmlChannelPrefix, Params.DeltaChannelPrefix)
+				deltaChannel, err := generateWatchDeltaChannelInfo(info)
 				if err != nil {
 					return err
 				}
-				deltaChannel := proto.Clone(info).(*datapb.VchannelInfo)
-				deltaChannel.ChannelName = deltaChannelName
 				watchDeltaChannels = append(watchDeltaChannels, deltaChannel)
 			}
 		}
@@ -1578,12 +1574,10 @@ func (ht *handoffTask) execute(ctx context.Context) error {
 			}
 			if len(watchDeltaChannels) != len(recoveryInfo.Channels) {
 				for _, info := range recoveryInfo.Channels {
-					deltaChannelName, err := rootcoord.ConvertChannelName(info.ChannelName, Params.DmlChannelPrefix, Params.DeltaChannelPrefix)
+					deltaChannel, err := generateWatchDeltaChannelInfo(info)
 					if err != nil {
 						return err
 					}
-					deltaChannel := proto.Clone(info).(*datapb.VchannelInfo)
-					deltaChannel.ChannelName = deltaChannelName
 					watchDeltaChannels = append(watchDeltaChannels, deltaChannel)
 				}
 			}
@@ -1770,12 +1764,10 @@ func (lbt *loadBalanceTask) execute(ctx context.Context) error {
 
 					if len(watchDeltaChannels) != len(recoveryInfo.Channels) {
 						for _, info := range recoveryInfo.Channels {
-							deltaChannelName, err := rootcoord.ConvertChannelName(info.ChannelName, Params.DmlChannelPrefix, Params.DeltaChannelPrefix)
+							deltaChannel, err := generateWatchDeltaChannelInfo(info)
 							if err != nil {
 								return err
 							}
-							deltaChannel := proto.Clone(info).(*datapb.VchannelInfo)
-							deltaChannel.ChannelName = deltaChannelName
 							watchDeltaChannels = append(watchDeltaChannels, deltaChannel)
 						}
 					}
@@ -1975,12 +1967,10 @@ func (lbt *loadBalanceTask) execute(ctx context.Context) error {
 
 				if len(watchDeltaChannels) != len(recoveryInfo.Channels) {
 					for _, info := range recoveryInfo.Channels {
-						deltaChannelName, err := rootcoord.ConvertChannelName(info.ChannelName, Params.DmlChannelPrefix, Params.DeltaChannelPrefix)
+						deltaChannel, err := generateWatchDeltaChannelInfo(info)
 						if err != nil {
 							return err
 						}
-						deltaChannel := proto.Clone(info).(*datapb.VchannelInfo)
-						deltaChannel.ChannelName = deltaChannelName
 						watchDeltaChannels = append(watchDeltaChannels, deltaChannel)
 					}
 				}
@@ -2213,3 +2203,16 @@ func assignInternalTask(ctx context.Context,
 func getSizeOfLoadSegmentReq(req *querypb.LoadSegmentsRequest) int {
 	return proto.Size(req)
 }
+
+func generateWatchDeltaChannelInfo(info *datapb.VchannelInfo) (*datapb.VchannelInfo, error) {
+	deltaChannelName, err := rootcoord.ConvertChannelName(info.ChannelName, Params.DmlChannelPrefix, Params.DeltaChannelPrefix)
+	if err != nil {
+		return nil, err
+	}
+	deltaChannel := proto.Clone(info).(*datapb.VchannelInfo)
+	deltaChannel.ChannelName = deltaChannelName
+	deltaChannel.UnflushedSegments = nil
+	deltaChannel.FlushedSegments = nil
+	deltaChannel.DroppedSegments = nil
+	return deltaChannel, nil
+}
diff --git a/internal/querynode/task.go b/internal/querynode/task.go
index 1699f25edb228b0c9f0e6e61a9b54b4ad3be64c9..6958be63ab62c130aa0ce2821cc961b972c9e0de 100644
--- a/internal/querynode/task.go
+++ b/internal/querynode/task.go
@@ -853,9 +853,10 @@ func (r *releasePartitionsTask) Execute(ctx context.Context) error {
 	if err != nil {
 		return err
 	}
-	log.Debug("start release history pids", zap.Any("pids", pids))
+	log.Debug("start release history pids", zap.Any("pids", pids), zap.Any("load type", hCol.getLoadType()))
 	if len(pids) == 0 && hCol.getLoadType() == loadTypePartition {
 		r.node.dataSyncService.removeCollectionDeltaFlowGraph(r.req.CollectionID)
+		log.Debug("release delta channels", zap.Any("deltaChannels", hCol.getVDeltaChannels()))
 		vChannels := hCol.getVDeltaChannels()
 		for _, channel := range vChannels {
 			log.Debug("Releasing tSafe in releasePartitionTask...",