Merge pull request #17586 from taosdata/enh/TD-19461

fix: alter replica one by one

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

@@ -1586,10 +1586,11 @@ int32_t mndBuildAlterVgroupAction(SMnode *pMnode, STrans *pTrans, SDbObj *pOldDb
     if (mndAddVnodeToVgroup(pMnode, &newVgroup, pArray) != 0) return -1;
     if (mndAddVnodeToVgroup(pMnode, &newVgroup, pArray) != 0) return -1;
     if (mndAddCreateVnodeAction(pMnode, pTrans, pNewDb, &newVgroup, &newVgroup.vnodeGid[1]) != 0) return -1;
-    if (mndAddCreateVnodeAction(pMnode, pTrans, pNewDb, &newVgroup, &newVgroup.vnodeGid[2]) != 0) return -1;
     if (mndAddAlterVnodeReplicaAction(pMnode, pTrans, pNewDb, &newVgroup, newVgroup.vnodeGid[0].dnodeId) != 0)
       return -1;
     if (mndAddAlterVnodeConfirmAction(pMnode, pTrans, pNewDb, &newVgroup) != 0) return -1;
+    if (mndAddCreateVnodeAction(pMnode, pTrans, pNewDb, &newVgroup, &newVgroup.vnodeGid[2]) != 0) return -1;
+    if (mndAddAlterVnodeConfirmAction(pMnode, pTrans, pNewDb, &newVgroup) != 0) return -1;
   } else if (newVgroup.replica == 3 && pNewDb->cfg.replications == 1) {
     mInfo("db:%s, vgId:%d, will remove 2 vnodes, vn:0 dnode:%d vn:1 dnode:%d vn:2 dnode:%d", pVgroup->dbName,
           pVgroup->vgId, pVgroup->vnodeGid[0].dnodeId, pVgroup->vnodeGid[1].dnodeId, pVgroup->vnodeGid[2].dnodeId);

tests/script/tsim/db/alter_replica_13.sim

@@ -127,8 +127,27 @@ if $data[0][8] != follower then
   goto step4
 endi
 
-print ============= step5: stop dnode 2
+print ============= step5: result
+$i = 0
+while $i < 1000
+  $i = $i + 1
 
+  sleep 1000
+  sql show db.vgroups
+  print ===> loop: $i | v0: $data03 $data04 | v1: $data05 $data06 | v2:  $data07 $data08 
+  if $data[0][4] != leader then
+    return -1
+  endi
+  if $data[0][6] != follower then
+    return -1
+  endi
+  if $data[0][8] != follower then
+    return -1
+  endi
+endw 
+
+
+print ============= step5: stop dnode 2
 sql select * from db.stb
 if $rows != 1 then
   return -1