diff --git a/internal/querycoordv2/task/action.go b/internal/querycoordv2/task/action.go
index 54823a988fa44..c0229c4065b1f 100644
--- a/internal/querycoordv2/task/action.go
+++ b/internal/querycoordv2/task/action.go
@@ -17,13 +17,14 @@
 package task
 
 import (
-	"reflect"
+	"fmt"
 
 	"github.com/samber/lo"
 	"go.uber.org/atomic"
 
 	"github.com/milvus-io/milvus/internal/proto/querypb"
 	"github.com/milvus-io/milvus/internal/querycoordv2/meta"
+	"github.com/milvus-io/milvus/pkg/common"
 	"github.com/milvus-io/milvus/pkg/util/funcutil"
 	"github.com/milvus-io/milvus/pkg/util/typeutil"
 )
@@ -50,6 +51,7 @@ type Action interface {
 	Node() int64
 	Type() ActionType
 	IsFinished(distMgr *meta.DistributionManager) bool
+	String() string
 }
 
 type BaseAction struct {
@@ -78,6 +80,10 @@ func (action *BaseAction) Shard() string {
 	return action.shard
 }
 
+func (action *BaseAction) String() string {
+	return fmt.Sprintf(`{[type=%v][node=%d][shard=%v]}`, action.Type(), action.Node(), action.Shard())
+}
+
 type SegmentAction struct {
 	*BaseAction
 
@@ -153,6 +159,10 @@ func (action *SegmentAction) IsFinished(distMgr *meta.DistributionManager) bool
 	return true
 }
 
+func (action *SegmentAction) String() string {
+	return action.BaseAction.String() + fmt.Sprintf(`{[segmentID=%d][scope=%d]}`, action.SegmentID(), action.Scope())
+}
+
 type ChannelAction struct {
 	*BaseAction
 }
@@ -218,6 +228,19 @@ func (action *LeaderAction) Version() typeutil.UniqueID {
 	return action.version
 }
 
+func (action *LeaderAction) PartStats() map[int64]int64 {
+	return action.partStatsVersions
+}
+
+func (action *LeaderAction) String() string {
+	partStatsStr := ""
+	if action.PartStats() != nil {
+		partStatsStr = fmt.Sprintf("%v", action.PartStats())
+	}
+	return action.BaseAction.String() + fmt.Sprintf(`{[leaderID=%v][segmentID=%d][version=%d][partStats=%s]}`,
+		action.GetLeaderID(), action.SegmentID(), action.Version(), partStatsStr)
+}
+
 func (action *LeaderAction) GetLeaderID() typeutil.UniqueID {
 	return action.leaderID
 }
@@ -237,7 +260,7 @@ func (action *LeaderAction) IsFinished(distMgr *meta.DistributionManager) bool {
 	case ActionTypeReduce:
 		return action.rpcReturned.Load() && (dist == nil || dist.NodeID != action.Node())
 	case ActionTypeUpdate:
-		return action.rpcReturned.Load() && (dist != nil && reflect.DeepEqual(action.partStatsVersions, view.PartitionStatsVersions))
+		return action.rpcReturned.Load() && common.MapEquals(action.partStatsVersions, view.PartitionStatsVersions)
 	}
 	return false
 }
diff --git a/internal/querycoordv2/task/task.go b/internal/querycoordv2/task/task.go
index d3f6d205aa998..ed7431a539b7b 100644
--- a/internal/querycoordv2/task/task.go
+++ b/internal/querycoordv2/task/task.go
@@ -280,15 +280,8 @@ func (task *baseTask) SetReason(reason string) {
 
 func (task *baseTask) String() string {
 	var actionsStr string
-	for i, action := range task.actions {
-		if realAction, ok := action.(*SegmentAction); ok {
-			actionsStr += fmt.Sprintf(`{[type=%v][node=%d][streaming=%v]}`, action.Type(), action.Node(), realAction.Scope() == querypb.DataScope_Streaming)
-		} else {
-			actionsStr += fmt.Sprintf(`{[type=%v][node=%d]}`, action.Type(), action.Node())
-		}
-		if i != len(task.actions)-1 {
-			actionsStr += ", "
-		}
+	for _, action := range task.actions {
+		actionsStr += action.String() + ","
 	}
 	return fmt.Sprintf(
 		"[id=%d] [type=%s] [source=%s] [reason=%s] [collectionID=%d] [replicaID=%d] [resourceGroup=%s] [priority=%s] [actionsCount=%d] [actions=%s]",
diff --git a/internal/querynodev2/delegator/delegator.go b/internal/querynodev2/delegator/delegator.go
index 64cb5edf35687..8db4345f7b595 100644
--- a/internal/querynodev2/delegator/delegator.go
+++ b/internal/querynodev2/delegator/delegator.go
@@ -825,7 +825,8 @@ func (sd *shardDelegator) loadPartitionStats(ctx context.Context, partStatsVersi
 			defer sd.partitionStatsMut.Unlock()
 			sd.partitionStats[partID] = partStats
 		}()
-		log.Info("Updated partitionStats for partition", zap.Int64("partitionID", partID))
+		log.Info("Updated partitionStats for partition", zap.Int64("collectionID", sd.collectionID), zap.Int64("partitionID", partID),
+			zap.Int64("newVersion", newVersion), zap.Int64("oldVersion", curStats.GetVersion()))
 	}
 }
 
diff --git a/internal/querynodev2/delegator/segment_pruner.go b/internal/querynodev2/delegator/segment_pruner.go
index a8155ce7c7c88..a1ea6129cb3c9 100644
--- a/internal/querynodev2/delegator/segment_pruner.go
+++ b/internal/querynodev2/delegator/segment_pruner.go
@@ -85,12 +85,12 @@ func PruneSegments(ctx context.Context,
 		plan := planpb.PlanNode{}
 		err := proto.Unmarshal(expr, &plan)
 		if err != nil {
-			log.Error("failed to unmarshall serialized expr from bytes, failed the operation")
+			log.Ctx(ctx).Error("failed to unmarshall serialized expr from bytes, failed the operation")
 			return
 		}
 		expr, err := exprutil.ParseExprFromPlan(&plan)
 		if err != nil {
-			log.Error("failed to parse expr from plan, failed the operation")
+			log.Ctx(ctx).Error("failed to parse expr from plan, failed the operation")
 			return
 		}
 		targetRanges, matchALL := exprutil.ParseRanges(expr, exprutil.ClusteringKey)
@@ -123,7 +123,8 @@ func PruneSegments(ctx context.Context,
 		metrics.QueryNodeSegmentPruneRatio.
 			WithLabelValues(fmt.Sprint(collectionID), fmt.Sprint(typeutil.IsVectorType(clusteringKeyField.GetDataType()))).
 			Observe(float64(realFilteredSegments / totalSegNum))
-		log.Debug("Pruned segment for search/query",
+		log.Ctx(ctx).Debug("Pruned segment for search/query",
+			zap.Int("filtered_segment_num[stats]", len(filteredSegments)),
 			zap.Int("filtered_segment_num[excluded]", realFilteredSegments),
 			zap.Int("total_segment_num", totalSegNum),
 			zap.Float32("filtered_ratio", float32(realFilteredSegments)/float32(totalSegNum)),
diff --git a/internal/storage/partition_stats.go b/internal/storage/partition_stats.go
index 7a49953eb9183..d7e3893e8097e 100644
--- a/internal/storage/partition_stats.go
+++ b/internal/storage/partition_stats.go
@@ -46,6 +46,9 @@ func NewPartitionStatsSnapshot() *PartitionStatsSnapshot {
 }
 
 func (ps *PartitionStatsSnapshot) GetVersion() int64 {
+	if ps == nil {
+		return 0
+	}
 	return ps.Version
 }
 
diff --git a/pkg/common/map.go b/pkg/common/map.go
index e5c9d21621332..4c9def2aa4ff5 100644
--- a/pkg/common/map.go
+++ b/pkg/common/map.go
@@ -22,3 +22,16 @@ func (m Str2Str) Equal(other Str2Str) bool {
 func CloneStr2Str(m Str2Str) Str2Str {
 	return m.Clone()
 }
+
+func MapEquals(m1, m2 map[int64]int64) bool {
+	if len(m1) != len(m2) {
+		return false
+	}
+	for k1, v1 := range m1 {
+		v2, exist := m2[k1]
+		if !exist || v1 != v2 {
+			return false
+		}
+	}
+	return true
+}
diff --git a/pkg/common/map_test.go b/pkg/common/map_test.go
index 2703609f653ac..e84065d4741f6 100644
--- a/pkg/common/map_test.go
+++ b/pkg/common/map_test.go
@@ -35,3 +35,25 @@ func TestCloneStr2Str(t *testing.T) {
 		})
 	}
 }
+
+func TestMapEqual(t *testing.T) {
+	{
+		m1 := map[int64]int64{1: 11, 2: 22, 3: 33}
+		m2 := map[int64]int64{1: 11, 2: 22, 3: 33}
+		assert.True(t, MapEquals(m1, m2))
+	}
+	{
+		m1 := map[int64]int64{1: 11, 2: 23, 3: 33}
+		m2 := map[int64]int64{1: 11, 2: 22, 3: 33}
+		assert.False(t, MapEquals(m1, m2))
+	}
+	{
+		m1 := map[int64]int64{1: 11, 2: 23, 3: 33}
+		m2 := map[int64]int64{1: 11, 2: 22}
+		assert.False(t, MapEquals(m1, m2))
+	}
+	{
+		m1 := map[int64]int64{1: 11, 2: 23, 3: 33}
+		assert.False(t, MapEquals(m1, nil))
+	}
+}