diff --git a/internal/querycoordv2/task/executor.go b/internal/querycoordv2/task/executor.go
index 581ca74bbe..11b52a3ab3 100644
--- a/internal/querycoordv2/task/executor.go
+++ b/internal/querycoordv2/task/executor.go
@@ -50,7 +50,7 @@ type Executor struct {
 	// Merge load segment requests
 	merger *Merger[segmentIndex, *querypb.LoadSegmentsRequest]
 
-	executingTasks   *typeutil.ConcurrentSet[int64] // taskID
+	executingTasks   *typeutil.ConcurrentSet[string] // task index
 	executingTaskNum atomic.Int32
 }
 
@@ -70,7 +70,7 @@ func NewExecutor(meta *meta.Meta,
 		nodeMgr:   nodeMgr,
 		merger:    NewMerger[segmentIndex, *querypb.LoadSegmentsRequest](),
 
-		executingTasks: typeutil.NewConcurrentSet[int64](),
+		executingTasks: typeutil.NewConcurrentSet[string](),
 	}
 }
 
@@ -88,12 +88,12 @@ func (ex *Executor) Stop() {
 // does nothing and returns false if the action is already committed,
 // returns true otherwise.
 func (ex *Executor) Execute(task Task, step int) bool {
-	exist := !ex.executingTasks.Insert(task.ID())
+	exist := !ex.executingTasks.Insert(task.Index())
 	if exist {
 		return false
 	}
 	if ex.executingTaskNum.Inc() > Params.QueryCoordCfg.TaskExecutionCap.GetAsInt32() {
-		ex.executingTasks.Remove(task.ID())
+		ex.executingTasks.Remove(task.Index())
 		ex.executingTaskNum.Dec()
 		return false
 	}
@@ -120,10 +120,6 @@ func (ex *Executor) Execute(task Task, step int) bool {
 	return true
 }
 
-func (ex *Executor) Exist(taskID int64) bool {
-	return ex.executingTasks.Contain(taskID)
-}
-
 func (ex *Executor) scheduleRequests() {
 	ex.wg.Add(1)
 	go func() {
@@ -208,7 +204,7 @@ func (ex *Executor) removeTask(task Task, step int) {
 			zap.Error(task.Err()))
 	}
 
-	ex.executingTasks.Remove(task.ID())
+	ex.executingTasks.Remove(task.Index())
 	ex.executingTaskNum.Dec()
 }
 
diff --git a/internal/querycoordv2/task/task.go b/internal/querycoordv2/task/task.go
index 407d806cc3..72be3e6a25 100644
--- a/internal/querycoordv2/task/task.go
+++ b/internal/querycoordv2/task/task.go
@@ -72,6 +72,7 @@ type Task interface {
 	Err() error
 	Priority() Priority
 	SetPriority(priority Priority)
+	Index() string // dedup indexing string
 
 	Cancel(err error)
 	Wait() error
@@ -166,6 +167,10 @@ func (task *baseTask) SetPriority(priority Priority) {
 	task.priority = priority
 }
 
+func (task *baseTask) Index() string {
+	return fmt.Sprintf("[replica=%d]", task.replicaID)
+}
+
 func (task *baseTask) Err() error {
 	select {
 	case <-task.doneCh:
@@ -290,6 +295,10 @@ func (task *SegmentTask) SegmentID() UniqueID {
 	return task.segmentID
 }
 
+func (task *SegmentTask) Index() string {
+	return fmt.Sprintf("%s[segment=%d][growing=%t]", task.baseTask.Index(), task.segmentID, task.Actions()[0].(*SegmentAction).Scope() == querypb.DataScope_Streaming)
+}
+
 func (task *SegmentTask) String() string {
 	return fmt.Sprintf("%s [segmentID=%d]", task.baseTask.String(), task.segmentID)
 }
@@ -335,6 +344,10 @@ func (task *ChannelTask) Channel() string {
 	return task.shard
 }
 
+func (task *ChannelTask) Index() string {
+	return fmt.Sprintf("%s[channel=%s]", task.baseTask.Index(), task.shard)
+}
+
 func (task *ChannelTask) String() string {
 	return fmt.Sprintf("%s [channel=%s]", task.baseTask.String(), task.Channel())
 }
diff --git a/internal/querycoordv2/task/task_test.go b/internal/querycoordv2/task/task_test.go
index e6add07182..3b6b5a8e88 100644
--- a/internal/querycoordv2/task/task_test.go
+++ b/internal/querycoordv2/task/task_test.go
@@ -1286,8 +1286,8 @@ func (suite *TaskSuite) dispatchAndWait(node int64) {
 		keys = make([]any, 0)
 
 		for _, executor := range suite.scheduler.executors {
-			executor.executingTasks.Range(func(taskID int64) bool {
-				keys = append(keys, taskID)
+			executor.executingTasks.Range(func(taskIndex string) bool {
+				keys = append(keys, taskIndex)
 				count++
 				return true
 			})