enh: check conflict before create trans

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

@@ -558,6 +558,7 @@ static int32_t mndCreateDnode(SMnode *pMnode, SRpcMsg *pReq, SCreateDnodeReq *pC
   pTrans = mndTransCreate(pMnode, TRN_POLICY_ROLLBACK, TRN_CONFLICT_GLOBAL, pReq, "create-dnode");
   if (pTrans == NULL) goto _OVER;
   mInfo("trans:%d, used to create dnode:%s", pTrans->id, dnodeObj.ep);
+  if (mndTrancCheckConflict(pMnode, pTrans) != 0) goto _OVER;
 
   pRaw = mndDnodeActionEncode(&dnodeObj);
   if (pRaw == NULL || mndTransAppendCommitlog(pTrans, pRaw) != 0) goto _OVER;
@@ -739,6 +740,7 @@ static int32_t mndDropDnode(SMnode *pMnode, SRpcMsg *pReq, SDnodeObj *pDnode, SM
   if (pTrans == NULL) goto _OVER;
   mndTransSetSerial(pTrans);
   mInfo("trans:%d, used to drop dnode:%d, force:%d", pTrans->id, pDnode->id, force);
+  if (mndTrancCheckConflict(pMnode, pTrans) != 0) goto _OVER;
 
   pRaw = mndDnodeActionEncode(pDnode);
   if (pRaw == NULL) goto _OVER;

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

@@ -390,6 +390,7 @@ static int32_t mndCreateMnode(SMnode *pMnode, SRpcMsg *pReq, SDnodeObj *pDnode,
   if (pTrans == NULL) goto _OVER;
   mndTransSetSerial(pTrans);
   mInfo("trans:%d, used to create mnode:%d", pTrans->id, pCreate->dnodeId);
+  if (mndTrancCheckConflict(pMnode, pTrans) != 0) goto _OVER;
 
   if (mndSetCreateMnodeRedoActions(pMnode, pTrans, pDnode, &mnodeObj) != 0) goto _OVER;
   if (mndSetCreateMnodeRedoLogs(pMnode, pTrans, &mnodeObj) != 0) goto _OVER;
@@ -526,6 +527,7 @@ static int32_t mndDropMnode(SMnode *pMnode, SRpcMsg *pReq, SMnodeObj *pObj) {
   if (pTrans == NULL) goto _OVER;
   mndTransSetSerial(pTrans);
   mInfo("trans:%d, used to drop mnode:%d", pTrans->id, pObj->id);
+  if (mndTrancCheckConflict(pMnode, pTrans) != 0) goto _OVER;
 
   if (mndSetDropMnodeInfoToTrans(pMnode, pTrans, pObj, false) != 0) goto _OVER;
   if (mndTransPrepare(pMnode, pTrans) != 0) goto _OVER;