enh(stream): do some internal refactor.

source/dnode/mnode/impl/src/mndStream.c

@@ -41,7 +41,7 @@ typedef struct SNodeEntry {
 } SNodeEntry;
 
 typedef struct SStreamVnodeRevertIndex {
-  SHashObj* pVnodeMap;
+//  SHashObj* pVnodeMap;
   SArray*   pNodeEntryList;
 } SStreamVnodeRevertIndex;
 
@@ -1787,7 +1787,7 @@ static int32_t createStreamUpdateTrans(SMnode* pMnode, SStreamObj* pStream, int3
   mDebug("start to build stream:0x%" PRIx64 " task DAG update", pStream->uid);
   ASSERT(0);
 
-  //  mndTransSetDbName(pTrans, "stream-task-update", "checkpoint");
+    mndTransSetDbName(pTrans, pStream->sourceDb, pStream->targetDb);
   if (mndTransCheckConflict(pMnode, pTrans) != 0) {
     mError("failed to build stream:0x%" PRIx64 " task DAG update, code:%s", pStream->uid,
            tstrerror(TSDB_CODE_MND_TRANS_CONFLICT));
@@ -1938,31 +1938,8 @@ int32_t mndProcessStreamHb(SRpcMsg *pReq) {
 
       // update the related upstream and downstream tasks
       taosWLockLatch(&pStream->lock);
-      int32_t numOfLevels = taosArrayGetSize(pStream->tasks);
-
-      for (int32_t j = 0; j < numOfLevels; ++j) {
-        SArray *pLevel = taosArrayGetP(pStream->tasks, j);
-
-        int32_t numOfTasks = taosArrayGetSize(pLevel);
-        for (int32_t k = 0; k < numOfTasks; ++k) {
-          SStreamTask *pTask = taosArrayGetP(pLevel, k);
-          if (pTask->info.nodeId == nodeId) {
-            pTask->info.epSet = newEpSet;
-            continue;
-          }
-
-          // check for the dispath info and the upstream task info
-          int32_t level = pTask->info.taskLevel;
-          if (level == TASK_LEVEL__SOURCE) {
-            streamTaskUpdateDownstreamInfo(pTask, nodeId, &newEpSet);
-          } else if (level == TASK_LEVEL__AGG) {
-            streamTaskUpdateUpstreamInfo(pTask, nodeId, &newEpSet);
-            streamTaskUpdateDownstreamInfo(pTask, nodeId, &newEpSet);
-          } else { // TASK_LEVEL__SINK
-            streamTaskUpdateUpstreamInfo(pTask, nodeId, &newEpSet);
-          }
-        }
-      }
+      updateTaskEpInfo(pStream, req.vgId, &req.epset);
+      // write down
 
       code = createStreamUpdateTrans(pMnode, pStream, nodeId, &newEpSet);
       if (code != TSDB_CODE_SUCCESS) {