refactor: do some internal refactor.

source/dnode/vnode/src/tq/tq.c

@@ -957,6 +957,8 @@ int32_t tqProcessTaskDeployReq(STQ* pTq, int64_t sversion, char* msg, int32_t ms
   // 1.deserialize msg and build task
   SStreamTask* pTask = taosMemoryCalloc(1, sizeof(SStreamTask));
   if (pTask == NULL) {
+    terrno = TSDB_CODE_OUT_OF_MEMORY;
+    tqError("vgId:%d failed to create stream task due to out of memory, alloc size:%d", vgId, (int32_t) sizeof(SStreamTask));
     return -1;
   }
 
@@ -974,9 +976,9 @@ int32_t tqProcessTaskDeployReq(STQ* pTq, int64_t sversion, char* msg, int32_t ms
   // 2.save task, use the newest commit version as the initial start version of stream task.
   taosWLockLatch(&pTq->pStreamMeta->lock);
   code = streamMetaAddDeployedTask(pTq->pStreamMeta, sversion, pTask);
+  int32_t numOfTasks = streamMetaGetNumOfTasks(pTq->pStreamMeta);
   if (code < 0) {
-    tqError("vgId:%d failed to add s-task:%s, total:%d", vgId, pTask->id.idStr,
-            streamMetaGetNumOfTasks(pTq->pStreamMeta));
+    tqError("vgId:%d failed to add s-task:%s, total:%d", vgId, pTask->id.idStr, numOfTasks);
     taosWUnLockLatch(&pTq->pStreamMeta->lock);
     return -1;
   }
@@ -989,7 +991,7 @@ int32_t tqProcessTaskDeployReq(STQ* pTq, int64_t sversion, char* msg, int32_t ms
   }
 
   tqDebug("vgId:%d s-task:%s is deployed and add meta from mnd, status:%d, total:%d", vgId, pTask->id.idStr,
-          pTask->status.taskStatus, streamMetaGetNumOfTasks(pTq->pStreamMeta));
+          pTask->status.taskStatus, numOfTasks);
   return 0;
 }
 

source/libs/stream/src/streamMeta.c

@@ -375,7 +375,7 @@ int32_t streamLoadTasks(SStreamMeta* pMeta, int64_t ver) {
     }
 
     if (pTask->fillHistory) {
-      pTask->status.taskStatus = TASK_STATUS__WAIT_DOWNSTREAM;
+      ASSERT(pTask->status.taskStatus == TASK_STATUS__WAIT_DOWNSTREAM);
       streamTaskCheckDownstream(pTask, ver);
     }
   }