diff --git a/internal/querynode/flow_graph_dd_node.go b/internal/querynode/flow_graph_dd_node.go
index 7f17774d6a..4bc25d7a04 100644
--- a/internal/querynode/flow_graph_dd_node.go
+++ b/internal/querynode/flow_graph_dd_node.go
@@ -43,7 +43,7 @@ func (ddNode *ddNode) Operate(in []flowgraph.Msg) []flowgraph.Msg {
 
 	msMsg, ok := in[0].(*MsgStreamMsg)
 	if !ok {
-		log.Error("type assertion failed for MsgStreamMsg")
+		log.Warn("type assertion failed for MsgStreamMsg")
 		// TODO: add error handling
 	}
 
diff --git a/internal/querynode/flow_graph_filter_dm_node.go b/internal/querynode/flow_graph_filter_dm_node.go
index e509ea7b14..c50000f1a3 100644
--- a/internal/querynode/flow_graph_filter_dm_node.go
+++ b/internal/querynode/flow_graph_filter_dm_node.go
@@ -46,7 +46,7 @@ func (fdmNode *filterDmNode) Operate(in []flowgraph.Msg) []flowgraph.Msg {
 
 	msgStreamMsg, ok := in[0].(*MsgStreamMsg)
 	if !ok {
-		log.Error("type assertion failed for MsgStreamMsg")
+		log.Warn("type assertion failed for MsgStreamMsg")
 		// TODO: add error handling
 	}
 
diff --git a/internal/querynode/flow_graph_gc_node.go b/internal/querynode/flow_graph_gc_node.go
index 634978f1dc..ee83ea0eac 100644
--- a/internal/querynode/flow_graph_gc_node.go
+++ b/internal/querynode/flow_graph_gc_node.go
@@ -37,7 +37,7 @@ func (gcNode *gcNode) Operate(in []flowgraph.Msg) []flowgraph.Msg {
 
 	_, ok := in[0].(*gcMsg)
 	if !ok {
-		log.Error("type assertion failed for gcMsg")
+		log.Warn("type assertion failed for gcMsg")
 		// TODO: add error handling
 	}
 
diff --git a/internal/querynode/flow_graph_insert_node.go b/internal/querynode/flow_graph_insert_node.go
index 7682682984..2d143fd52c 100644
--- a/internal/querynode/flow_graph_insert_node.go
+++ b/internal/querynode/flow_graph_insert_node.go
@@ -51,7 +51,7 @@ func (iNode *insertNode) Operate(in []flowgraph.Msg) []flowgraph.Msg {
 
 	iMsg, ok := in[0].(*insertMsg)
 	if !ok {
-		log.Error("type assertion failed for insertMsg")
+		log.Warn("type assertion failed for insertMsg")
 		// TODO: add error handling
 	}
 
diff --git a/internal/querynode/flow_graph_service_time_node.go b/internal/querynode/flow_graph_service_time_node.go
index d87019af9a..85c165a96e 100644
--- a/internal/querynode/flow_graph_service_time_node.go
+++ b/internal/querynode/flow_graph_service_time_node.go
@@ -49,7 +49,7 @@ func (stNode *serviceTimeNode) Operate(in []flowgraph.Msg) []flowgraph.Msg {
 
 	serviceTimeMsg, ok := in[0].(*serviceTimeMsg)
 	if !ok {
-		log.Error("type assertion failed for serviceTimeMsg")
+		log.Warn("type assertion failed for serviceTimeMsg")
 		// TODO: add error handling
 	}
 
diff --git a/internal/querynode/query_collection.go b/internal/querynode/query_collection.go
index aef4252cf3..a7d51271ea 100644
--- a/internal/querynode/query_collection.go
+++ b/internal/querynode/query_collection.go
@@ -156,7 +156,7 @@ func (q *queryCollection) waitNewTSafe() Timestamp {
 	// block until any vChannel updating tSafe
 	_, _, recvOK := reflect.Select(q.watcherSelectCase)
 	if !recvOK {
-		log.Error("tSafe has been closed", zap.Any("collectionID", q.collectionID))
+		//log.Error("tSafe has been closed", zap.Any("collectionID", q.collectionID))
 		return Timestamp(math.MaxInt64)
 	}
 	//log.Debug("wait new tSafe", zap.Any("collectionID", s.collectionID))
@@ -202,13 +202,13 @@ func (q *queryCollection) consumeQuery() {
 		default:
 			msgPack := q.queryMsgStream.Consume()
 			if msgPack == nil || len(msgPack.Msgs) <= 0 {
-				msgPackNil := msgPack == nil
-				msgPackEmpty := true
-				if msgPack != nil {
-					msgPackEmpty = len(msgPack.Msgs) <= 0
-				}
-				log.Debug("consume query message failed", zap.Any("msgPack is Nil", msgPackNil),
-					zap.Any("msgPackEmpty", msgPackEmpty))
+				//msgPackNil := msgPack == nil
+				//msgPackEmpty := true
+				//if msgPack != nil {
+				//	msgPackEmpty = len(msgPack.Msgs) <= 0
+				//}
+				//log.Debug("consume query message failed", zap.Any("msgPack is Nil", msgPackNil),
+				//	zap.Any("msgPackEmpty", msgPackEmpty))
 				continue
 			}
 			for _, msg := range msgPack.Msgs {
@@ -267,28 +267,28 @@ func (q *queryCollection) receiveQueryMsg(msg queryMsg) {
 	case commonpb.MsgType_Retrieve:
 		collectionID = msg.(*msgstream.RetrieveMsg).CollectionID
 		msgTypeStr = "retrieve"
-		log.Debug("consume retrieve message",
-			zap.Any("collectionID", collectionID),
-			zap.Int64("msgID", msg.ID()),
-		)
+		//log.Debug("consume retrieve message",
+		//	zap.Any("collectionID", collectionID),
+		//	zap.Int64("msgID", msg.ID()),
+		//)
 	case commonpb.MsgType_Search:
 		collectionID = msg.(*msgstream.SearchMsg).CollectionID
 		msgTypeStr = "search"
-		log.Debug("consume search message",
-			zap.Any("collectionID", collectionID),
-			zap.Int64("msgID", msg.ID()),
-		)
+		//log.Debug("consume search message",
+		//	zap.Any("collectionID", collectionID),
+		//	zap.Int64("msgID", msg.ID()),
+		//)
 	default:
 		err := fmt.Errorf("receive invalid msgType = %d", msgType)
 		log.Error(err.Error())
 		return
 	}
 	if collectionID != q.collectionID {
-		log.Error("not target collection query request",
-			zap.Any("collectionID", q.collectionID),
-			zap.Int64("target collectionID", collectionID),
-			zap.Int64("msgID", msg.ID()),
-		)
+		//log.Error("not target collection query request",
+		//	zap.Any("collectionID", q.collectionID),
+		//	zap.Int64("target collectionID", collectionID),
+		//	zap.Int64("msgID", msg.ID()),
+		//)
 		return
 	}
 
diff --git a/internal/querynode/reduce.go b/internal/querynode/reduce.go
index 083565a1f8..90e5da4582 100644
--- a/internal/querynode/reduce.go
+++ b/internal/querynode/reduce.go
@@ -22,7 +22,6 @@ package querynode
 import "C"
 import (
 	"errors"
-	"fmt"
 	"strconv"
 	"sync"
 	"unsafe"
@@ -61,7 +60,7 @@ func reduceSearchResults(searchResults []*SearchResult, numSegments int64, inRed
 
 func fillTargetEntry(plan *SearchPlan, searchResults []*SearchResult, matchedSegments []*Segment, inReduced []bool) error {
 	wg := &sync.WaitGroup{}
-	fmt.Println(inReduced)
+	//fmt.Println(inReduced)
 	for i := range inReduced {
 		if inReduced[i] {
 			wg.Add(1)
diff --git a/internal/util/flowgraph/node.go b/internal/util/flowgraph/node.go
index e97a52110f..07f18d2cce 100644
--- a/internal/util/flowgraph/node.go
+++ b/internal/util/flowgraph/node.go
@@ -58,7 +58,7 @@ func (nodeCtx *nodeCtx) Start(ctx context.Context, wg *sync.WaitGroup) {
 		select {
 		case <-ctx.Done():
 			wg.Done()
-			fmt.Println(nodeCtx.node.Name(), "closed")
+			//fmt.Println(nodeCtx.node.Name(), "closed")
 			return
 		default:
 			// inputs from inputsMessages for Operate