fix(stream): secure the delete task operation. TD-1198

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

@@ -1326,7 +1326,9 @@ int32_t tqStartStreamTasks(STQ* pTq) {
   int32_t vgId = TD_VID(pTq->pVnode);
 
   SStreamMeta* pMeta = pTq->pStreamMeta;
+
   taosWLockLatch(&pMeta->lock);
+
   int32_t numOfTasks = taosHashGetSize(pTq->pStreamMeta->pTasks);
   if (numOfTasks == 0) {
     tqInfo("vgId:%d no stream tasks exists", vgId);

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

@@ -1039,6 +1039,5 @@ int32_t tqUpdateTbUidList(STQ* pTq, const SArray* tbUidList, bool isAdd) {
   }
 
   taosWUnLockLatch(&pTq->pStreamMeta->lock);
-
   return 0;
 }

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

@@ -36,6 +36,7 @@ int32_t tqStreamTasksScanWal(STQ* pTq) {
 
     if (shouldIdle) {
       taosWLockLatch(&pMeta->lock);
+
       pMeta->walScanCounter -= 1;
       times = pMeta->walScanCounter;
 

source/libs/stream/src/streamExec.c

@@ -313,6 +313,7 @@ int32_t streamExecForAll(SStreamTask* pTask) {
       pTask->chkInfo = (SCheckpointInfo) {.version = dataVer, .id = ckId, .currentVer = pTask->chkInfo.currentVer};
 
       taosWLockLatch(&pTask->pMeta->lock);
+
       streamMetaSaveTask(pTask->pMeta, pTask);
       if (streamMetaCommit(pTask->pMeta) < 0) {
         taosWUnLockLatch(&pTask->pMeta->lock);

source/libs/stream/src/streamMeta.c

@@ -216,12 +216,14 @@ void streamMetaRemoveTask(SStreamMeta* pMeta, int32_t taskId) {
   SStreamTask** ppTask = (SStreamTask**)taosHashGet(pMeta->pTasks, &taskId, sizeof(int32_t));
   if (ppTask) {
     SStreamTask* pTask = *ppTask;
+
+    taosWLockLatch(&pMeta->lock);
+
     taosHashRemove(pMeta->pTasks, &taskId, sizeof(int32_t));
     tdbTbDelete(pMeta->pTaskDb, &taskId, sizeof(int32_t), pMeta->txn);
 
     atomic_store_8(&pTask->status.taskStatus, TASK_STATUS__STOP);
 
-    taosWLockLatch(&pMeta->lock);
     streamMetaReleaseTask(pMeta, pTask);
     taosWUnLockLatch(&pMeta->lock);
   }