[TD-3963]fix alter vgroup bugs

src/mnode/inc/mnodeDb.h

@@ -40,6 +40,7 @@ void    mnodeIncDbRef(SDbObj *pDb);
 void    mnodeDecDbRef(SDbObj *pDb);
 bool    mnodeCheckIsMonitorDB(char *db, char *monitordb);
 void    mnodeDropAllDbs(SAcctObj *pAcct);
+int     mnodeInsertAlterRow(SDbObj *pDb, void *pMsg);
 
 int32_t mnodeCompactDbs();
 

src/mnode/src/mnodeDb.c

@@ -1102,6 +1102,17 @@ static int32_t mnodeAlterDbFp(SMnodeMsg *pMsg) {
   return TSDB_CODE_MND_ACTION_IN_PROGRESS;
 }
 
+int mnodeInsertAlterRow(SDbObj *pDb, void *pMsg) {
+  SSdbRow desc = {
+    .type    = SDB_OPER_GLOBAL,
+    .pTable  = tsDbSdb,
+    .pObj    = pDb,
+    .pMsg    = pMsg,
+  };
+
+  return sdbInsertRowToQueue(&desc);
+}
+
 static int32_t mnodeAlterDb(SDbObj *pDb, SAlterDbMsg *pAlter, void *pMsg) {
   mDebug("db:%s, type:%d do alter operation", pDb->name, pDb->cfg.dbType);
 

src/mnode/src/mnodeVgroup.c

@@ -961,6 +961,7 @@ void mnodeSendAlterVgroupMsg(SVgObj *pVgroup,SMnodeMsg *pMsg) {
          pVgroup->dbName);
   if (pMsg) {
     pMsg->pVgroup = pVgroup;
+    mnodeIncVgroupRef(pVgroup);
   }
   for (int32_t i = 0; i < pVgroup->numOfVnodes; ++i) {
     SRpcEpSet epSet = mnodeGetEpSetFromIp(pVgroup->vnodeGid[i].pDnode->dnodeEp);
@@ -1044,7 +1045,9 @@ static void mnodeProcessAlterVnodeRsp(SRpcMsg *rpcMsg) {
 
   if (mnodeMsg->received != mnodeMsg->expected) return;
 
-  dnodeReprocessMWriteMsg(mnodeMsg);
+  mnodeInsertAlterRow(pVgroup->pDb, mnodeMsg);
+
+  dnodeSendRpcMWriteRsp(mnodeMsg, TSDB_CODE_SUCCESS);
 }
 
 static void mnodeProcessCreateVnodeRsp(SRpcMsg *rpcMsg) {