diff --git a/source/dnode/vnode/src/tq/tq.c b/source/dnode/vnode/src/tq/tq.c
index 9002001404..02509d994d 100644
--- a/source/dnode/vnode/src/tq/tq.c
+++ b/source/dnode/vnode/src/tq/tq.c
@@ -1087,16 +1087,14 @@ int32_t tqProcessTaskScanHistory(STQ* pTq, SRpcMsg* pMsg) {
   int64_t st = taosGetTimestampMs();
 
   // we have to continue retrying to successfully execute the scan history task.
-  while (1) {
-    int8_t schedStatus = atomic_val_compare_exchange_8(&pTask->status.schedStatus, TASK_SCHED_STATUS__INACTIVE,
-                                                       TASK_SCHED_STATUS__WAITING);
-    if (schedStatus == TASK_SCHED_STATUS__INACTIVE) {
-      break;
-    }
-
-    tqError("s-task:%s failed to start scan history in current time window, unexpected sched-status:%d, retry in 100ms",
-            id, schedStatus);
-    taosMsleep(100);
+  int8_t schedStatus = atomic_val_compare_exchange_8(&pTask->status.schedStatus, TASK_SCHED_STATUS__INACTIVE,
+                                                     TASK_SCHED_STATUS__WAITING);
+  if (schedStatus != TASK_SCHED_STATUS__INACTIVE) {
+    tqError(
+        "s-task:%s failed to start scan-history in first stream time window since already started, unexpected "
+        "sched-status:%d",
+        id, schedStatus);
+    return 0;
   }
 
   ASSERT(pTask->status.pauseAllowed == false);
diff --git a/source/libs/stream/src/streamExec.c b/source/libs/stream/src/streamExec.c
index 7127b1c323..e7adcf36dc 100644
--- a/source/libs/stream/src/streamExec.c
+++ b/source/libs/stream/src/streamExec.c
@@ -594,6 +594,9 @@ int32_t streamTryExec(SStreamTask* pTask) {
         (!streamTaskShouldPause(&pTask->status))) {
       streamSchedExec(pTask);
     }
+  } else {
+    qDebug("s-task:%s already started to exec by other thread, status:%s, sched-status:%d", pTask->id.idStr,
+           streamGetTaskStatusStr(pTask->status.taskStatus), pTask->status.schedStatus);
   }
 
   return 0;