fix: balance vgroup

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

@@ -1599,7 +1599,8 @@ static int32_t mndSetBalanceVgroupInfoToTrans(SMnode *pMnode, STrans *pTrans, SD
   return 0;
 }
 
-static int32_t mndBalanceVgroupBetweenDnode(SMnode *pMnode, STrans *pTrans, SDnodeObj *pSrc, SDnodeObj *pDst) {
+static int32_t mndBalanceVgroupBetweenDnode(SMnode *pMnode, STrans *pTrans, SDnodeObj *pSrc, SDnodeObj *pDst,
+                                            SHashObj *pBalancedVgroups) {
   void   *pIter = NULL;
   int32_t code = -1;
   SSdb   *pSdb = pMnode->pSdb;
@@ -1608,6 +1609,10 @@ static int32_t mndBalanceVgroupBetweenDnode(SMnode *pMnode, STrans *pTrans, SDno
     SVgObj *pVgroup = NULL;
     pIter = sdbFetch(pSdb, SDB_VGROUP, pIter, (void **)&pVgroup);
     if (pIter == NULL) break;
+    if (taosHashGet(pBalancedVgroups, &pVgroup->vgId, sizeof(int32_t)) != NULL) {
+      sdbRelease(pSdb, pVgroup);
+      continue;
+    }
 
     bool existInSrc = false;
     bool existInDst = false;
@@ -1624,6 +1629,9 @@ static int32_t mndBalanceVgroupBetweenDnode(SMnode *pMnode, STrans *pTrans, SDno
 
     SDbObj *pDb = mndAcquireDb(pMnode, pVgroup->dbName);
     code = mndSetBalanceVgroupInfoToTrans(pMnode, pTrans, pDb, pVgroup, pSrc, pDst);
+    if (code == 0) {
+      code = taosHashPut(pBalancedVgroups, &pVgroup->vgId, sizeof(int32_t), &pVgroup->vgId, sizeof(int32_t));
+    }
     mndReleaseDb(pMnode, pDb);
     sdbRelease(pSdb, pVgroup);
     sdbCancelFetch(pSdb, pIter);
@@ -1637,6 +1645,10 @@ static int32_t mndBalanceVgroup(SMnode *pMnode, SRpcMsg *pReq, SArray *pArray) {
   int32_t code = -1;
   int32_t numOfVgroups = 0;
   STrans *pTrans = NULL;
+  SHashObj *pBalancedVgroups = NULL;
+
+  pBalancedVgroups = taosHashInit(16, taosGetDefaultHashFunction(TSDB_DATA_TYPE_INT), false, HASH_NO_LOCK);
+  if (pBalancedVgroups == NULL) goto _OVER;
 
   pTrans = mndTransCreate(pMnode, TRN_POLICY_RETRY, TRN_CONFLICT_GLOBAL, pReq);
   if (pTrans == NULL) goto _OVER;
@@ -1660,15 +1672,15 @@ static int32_t mndBalanceVgroup(SMnode *pMnode, SRpcMsg *pReq, SArray *pArray) {
            pDst->id, dstScore);
 
     if (srcScore > dstScore - 0.000001) {
-      code = mndBalanceVgroupBetweenDnode(pMnode, pTrans, pSrc, pDst);
+      code = mndBalanceVgroupBetweenDnode(pMnode, pTrans, pSrc, pDst, pBalancedVgroups);
       if (code == 0) {
         pSrc->numOfVnodes--;
         pDst->numOfVnodes++;
         numOfVgroups++;
         continue;
       } else {
-        mError("trans:%d, failed to balance vgroup from dnode:%d to dnode:%d", pTrans->id, pSrc->id, pDst->id);
-        return -1;
+        mDebug("trans:%d, no vgroup need to balance from dnode:%d to dnode:%d", pTrans->id, pSrc->id, pDst->id);
+        break;
       }
     } else {
       mDebug("trans:%d, no vgroup need to balance any more", pTrans->id);