diff --git a/source/dnode/mgmt/impl/src/dndBnode.c b/source/dnode/mgmt/impl/src/dndBnode.c
index 61b220158f..15be59a419 100644
--- a/source/dnode/mgmt/impl/src/dndBnode.c
+++ b/source/dnode/mgmt/impl/src/dndBnode.c
@@ -42,18 +42,13 @@ static SBnode *dndAcquireBnode(SDnode *pDnode) {
 }
 
 static void dndReleaseBnode(SDnode *pDnode, SBnode *pBnode) {
+  if (pBnode == NULL) return;
+
   SBnodeMgmt *pMgmt = &pDnode->bmgmt;
-  int32_t     refCount = 0;
-
   taosRLockLatch(&pMgmt->latch);
-  if (pBnode != NULL) {
-    refCount = atomic_sub_fetch_32(&pMgmt->refCount, 1);
-  }
+  int32_t refCount = atomic_sub_fetch_32(&pMgmt->refCount, 1);
   taosRUnLockLatch(&pMgmt->latch);
-
-  if (pBnode != NULL) {
-    dTrace("release bnode, refCount:%d", refCount);
-  }
+  dTrace("release bnode, refCount:%d", refCount);
 }
 
 static int32_t dndReadBnodeFile(SDnode *pDnode) {
diff --git a/source/dnode/mgmt/impl/src/dndMnode.c b/source/dnode/mgmt/impl/src/dndMnode.c
index ae37967b3d..6c23af7f00 100644
--- a/source/dnode/mgmt/impl/src/dndMnode.c
+++ b/source/dnode/mgmt/impl/src/dndMnode.c
@@ -43,18 +43,13 @@ static SMnode *dndAcquireMnode(SDnode *pDnode) {
 }
 
 static void dndReleaseMnode(SDnode *pDnode, SMnode *pMnode) {
+  if (pMnode == NULL) return;
+
   SMnodeMgmt *pMgmt = &pDnode->mmgmt;
-  int32_t     refCount = 0;
-
   taosRLockLatch(&pMgmt->latch);
-  if (pMnode != NULL) {
-    refCount = atomic_sub_fetch_32(&pMgmt->refCount, 1);
-  }
+  int32_t refCount = atomic_sub_fetch_32(&pMgmt->refCount, 1);
   taosRUnLockLatch(&pMgmt->latch);
-
-  if (pMnode != NULL) {
-    dTrace("release mnode, refCount:%d", refCount);
-  }
+  dTrace("release mnode, refCount:%d", refCount);
 }
 
 static int32_t dndReadMnodeFile(SDnode *pDnode) {
diff --git a/source/dnode/mgmt/impl/src/dndQnode.c b/source/dnode/mgmt/impl/src/dndQnode.c
index 3deee93e29..9d2f623c45 100644
--- a/source/dnode/mgmt/impl/src/dndQnode.c
+++ b/source/dnode/mgmt/impl/src/dndQnode.c
@@ -42,18 +42,13 @@ static SQnode *dndAcquireQnode(SDnode *pDnode) {
 }
 
 static void dndReleaseQnode(SDnode *pDnode, SQnode *pQnode) {
+  if (pQnode == NULL) return;
+
   SQnodeMgmt *pMgmt = &pDnode->qmgmt;
-  int32_t     refCount = 0;
-
   taosRLockLatch(&pMgmt->latch);
-  if (pQnode != NULL) {
-    refCount = atomic_sub_fetch_32(&pMgmt->refCount, 1);
-  }
+  int32_t refCount = atomic_sub_fetch_32(&pMgmt->refCount, 1);
   taosRUnLockLatch(&pMgmt->latch);
-
-  if (pQnode != NULL) {
-    dTrace("release qnode, refCount:%d", refCount);
-  }
+  dTrace("release qnode, refCount:%d", refCount);
 }
 
 static int32_t dndReadQnodeFile(SDnode *pDnode) {
diff --git a/source/dnode/mgmt/impl/src/dndSnode.c b/source/dnode/mgmt/impl/src/dndSnode.c
index ab4e38bfb2..00435d4c3e 100644
--- a/source/dnode/mgmt/impl/src/dndSnode.c
+++ b/source/dnode/mgmt/impl/src/dndSnode.c
@@ -42,18 +42,13 @@ static SSnode *dndAcquireSnode(SDnode *pDnode) {
 }
 
 static void dndReleaseSnode(SDnode *pDnode, SSnode *pSnode) {
+  if (pSnode == NULL) return;
+
   SSnodeMgmt *pMgmt = &pDnode->smgmt;
-  int32_t     refCount = 0;
-
   taosRLockLatch(&pMgmt->latch);
-  if (pSnode != NULL) {
-    refCount = atomic_sub_fetch_32(&pMgmt->refCount, 1);
-  }
+  int32_t refCount = atomic_sub_fetch_32(&pMgmt->refCount, 1);
   taosRUnLockLatch(&pMgmt->latch);
-
-  if (pSnode != NULL) {
-    dTrace("release snode, refCount:%d", refCount);
-  }
+  dTrace("release snode, refCount:%d", refCount);
 }
 
 static int32_t dndReadSnodeFile(SDnode *pDnode) {
diff --git a/source/dnode/mgmt/impl/src/dndVnodes.c b/source/dnode/mgmt/impl/src/dndVnodes.c
index 1269562968..6d90da8b31 100644
--- a/source/dnode/mgmt/impl/src/dndVnodes.c
+++ b/source/dnode/mgmt/impl/src/dndVnodes.c
@@ -40,7 +40,7 @@ typedef struct {
   STaosQueue *pSyncQ;
   STaosQueue *pApplyQ;
   STaosQueue *pQueryQ;
-  STaosQueue* pFetchQ;
+  STaosQueue *pFetchQ;
 } SVnodeObj;
 
 typedef struct {
@@ -53,22 +53,8 @@ typedef struct {
   SWrapperCfg *pCfgs;
 } SVnodeThread;
 
-static int32_t dndInitVnodeReadWorker(SDnode *pDnode);
-static int32_t dndInitVnodeWriteWorker(SDnode *pDnode);
-static int32_t dndInitVnodeSyncWorker(SDnode *pDnode);
-static void    dndCleanupVnodeReadWorker(SDnode *pDnode);
-static void    dndCleanupVnodeWriteWorker(SDnode *pDnode);
-static void    dndCleanupVnodeSyncWorker(SDnode *pDnode);
-static int32_t dndAllocVnodeQueryQueue(SDnode *pDnode, SVnodeObj *pVnode);
-static int32_t dndAllocVnodeFetchQueue(SDnode *pDnode, SVnodeObj *pVnode);
-static int32_t dndAllocVnodeWriteQueue(SDnode *pDnode, SVnodeObj *pVnode);
-static int32_t dndAllocVnodeApplyQueue(SDnode *pDnode, SVnodeObj *pVnode);
-static int32_t dndAllocVnodeSyncQueue(SDnode *pDnode, SVnodeObj *pVnode);
-static void    dndFreeVnodeQueryQueue(SDnode *pDnode, SVnodeObj *pVnode);
-static void    dndFreeVnodeFetchQueue(SDnode *pDnode, SVnodeObj *pVnode);
-static void    dndFreeVnodeWriteQueue(SDnode *pDnode, SVnodeObj *pVnode);
-static void    dndFreeVnodeApplyQueue(SDnode *pDnode, SVnodeObj *pVnode);
-static void    dndFreeVnodeSyncQueue(SDnode *pDnode, SVnodeObj *pVnode);
+static int32_t dndAllocVnodeQueue(SDnode *pDnode, SVnodeObj *pVnode);
+static void    dndFreeVnodeQueue(SDnode *pDnode, SVnodeObj *pVnode);
 
 static void    dndProcessVnodeQueryQueue(SVnodeObj *pVnode, SRpcMsg *pMsg);
 static void    dndProcessVnodeFetchQueue(SVnodeObj *pVnode, SRpcMsg *pMsg);
@@ -117,11 +103,9 @@ static void dndReleaseVnode(SDnode *pDnode, SVnodeObj *pVnode) {
   if (pVnode == NULL) return;
 
   SVnodesMgmt *pMgmt = &pDnode->vmgmt;
-
   taosRLockLatch(&pMgmt->latch);
   int32_t refCount = atomic_sub_fetch_32(&pVnode->refCount, 1);
   taosRUnLockLatch(&pMgmt->latch);
-
   dTrace("vgId:%d, release vnode, refCount:%d", pVnode->vgId, refCount);
 }
 
@@ -134,7 +118,7 @@ static int32_t dndOpenVnode(SDnode *pDnode, SWrapperCfg *pCfg, SVnode *pImpl) {
   }
 
   pVnode->vgId = pCfg->vgId;
-  pVnode->refCount = 1;
+  pVnode->refCount = 0;
   pVnode->dropped = 0;
   pVnode->accessState = TSDB_VN_ALL_ACCCESS;
   pVnode->pImpl = pImpl;
@@ -148,23 +132,8 @@ static int32_t dndOpenVnode(SDnode *pDnode, SWrapperCfg *pCfg, SVnode *pImpl) {
     return -1;
   }
 
-  if (dndAllocVnodeQueryQueue(pDnode, pVnode) != 0) {
-    return -1;
-  }
-
-  if (dndAllocVnodeFetchQueue(pDnode, pVnode) != 0) {
-    return -1;
-  }
-
-  if (dndAllocVnodeWriteQueue(pDnode, pVnode) != 0) {
-    return -1;
-  }
-
-  if (dndAllocVnodeApplyQueue(pDnode, pVnode) != 0) {
-    return -1;
-  }
-
-  if (dndAllocVnodeSyncQueue(pDnode, pVnode) != 0) {
+  if (dndAllocVnodeQueue(pDnode, pVnode) != 0) {
+    terrno = TSDB_CODE_OUT_OF_MEMORY;
     return -1;
   }
 
@@ -192,12 +161,7 @@ static void dndCloseVnode(SDnode *pDnode, SVnodeObj *pVnode) {
   while (!taosQueueEmpty(pVnode->pQueryQ)) taosMsleep(10);
   while (!taosQueueEmpty(pVnode->pFetchQ)) taosMsleep(10);
 
-  dndFreeVnodeQueryQueue(pDnode, pVnode);
-  dndFreeVnodeFetchQueue(pDnode, pVnode);
-  dndFreeVnodeWriteQueue(pDnode, pVnode);
-  dndFreeVnodeApplyQueue(pDnode, pVnode);
-  dndFreeVnodeSyncQueue(pDnode, pVnode);
-  
+  dndFreeVnodeQueue(pDnode, pVnode);
   vnodeClose(pVnode->pImpl);
   pVnode->pImpl = NULL;
 
@@ -527,8 +491,8 @@ static void dndCloseVnodes(SDnode *pDnode) {
   dInfo("total vnodes:%d are all closed", numOfVnodes);
 }
 
-static SCreateVnodeReq *dndParseCreateVnodeReq(SRpcMsg *rpcMsg) {
-  SCreateVnodeReq *pCreate = rpcMsg->pCont;
+static SCreateVnodeReq *dndParseCreateVnodeReq(SRpcMsg *pReq) {
+  SCreateVnodeReq *pCreate = pReq->pCont;
   pCreate->vgId = htonl(pCreate->vgId);
   pCreate->dnodeId = htonl(pCreate->dnodeId);
   pCreate->dbUid = htobe64(pCreate->dbUid);
@@ -585,14 +549,14 @@ static void dndGenerateWrapperCfg(SDnode *pDnode, SCreateVnodeReq *pCreate, SWra
   pCfg->vgVersion = pCreate->vgVersion;
 }
 
-static SDropVnodeReq *vnodeParseDropVnodeReq(SRpcMsg *rpcMsg) {
-  SDropVnodeReq *pDrop = rpcMsg->pCont;
+static SDropVnodeReq *vnodeParseDropVnodeReq(SRpcMsg *pReq) {
+  SDropVnodeReq *pDrop = pReq->pCont;
   pDrop->vgId = htonl(pDrop->vgId);
   return pDrop;
 }
 
-static SAuthVnodeReq *vnodeParseAuthVnodeReq(SRpcMsg *rpcMsg) {
-  SAuthVnodeReq *pAuth = rpcMsg->pCont;
+static SAuthVnodeReq *vnodeParseAuthVnodeReq(SRpcMsg *pReq) {
+  SAuthVnodeReq *pAuth = pReq->pCont;
   pAuth->vgId = htonl(pAuth->vgId);
   return pAuth;
 }
@@ -612,7 +576,7 @@ int32_t dndProcessCreateVnodeReq(SDnode *pDnode, SRpcMsg *pReq) {
     dDebug("vgId:%d, already exist, return success", pCreate->vgId);
     dndReleaseVnode(pDnode, pVnode);
     terrno = TSDB_CODE_DND_VNODE_ALREADY_DEPLOYED;
-    return -1;
+    return 0;
   }
 
   SVnode *pImpl = vnodeOpen(wrapperCfg.path, &vnodeCfg);
@@ -648,16 +612,13 @@ int32_t dndProcessAlterVnodeReq(SDnode *pDnode, SRpcMsg *pReq) {
   SVnodeCfg vnodeCfg = {0};
   dndGenerateVnodeCfg(pAlter, &vnodeCfg);
 
-  SWrapperCfg wrapperCfg = {0};
-  dndGenerateWrapperCfg(pDnode, pAlter, &wrapperCfg);
-
   SVnodeObj *pVnode = dndAcquireVnode(pDnode, pAlter->vgId);
   if (pVnode == NULL) {
     dDebug("vgId:%d, failed to alter vnode since %s", pAlter->vgId, terrstr());
     return -1;
   }
 
-  if (wrapperCfg.vgVersion == pVnode->vgVersion) {
+  if (pAlter->vgVersion == pVnode->vgVersion) {
     dndReleaseVnode(pDnode, pVnode);
     dDebug("vgId:%d, no need to alter vnode cfg for version unchanged ", pAlter->vgId);
     return 0;
@@ -670,7 +631,7 @@ int32_t dndProcessAlterVnodeReq(SDnode *pDnode, SRpcMsg *pReq) {
   }
 
   int32_t oldVersion = pVnode->vgVersion;
-  pVnode->vgVersion = wrapperCfg.vgVersion;
+  pVnode->vgVersion = pAlter->vgVersion;
   int32_t code = dndWriteVnodesToFile(pDnode);
   if (code != 0) {
     pVnode->vgVersion = oldVersion;
@@ -689,7 +650,7 @@ int32_t dndProcessDropVnodeReq(SDnode *pDnode, SRpcMsg *pReq) {
   SVnodeObj *pVnode = dndAcquireVnode(pDnode, vgId);
   if (pVnode == NULL) {
     dDebug("vgId:%d, failed to drop since %s", vgId, terrstr());
-    return -1;
+    return 0;
   }
 
   pVnode->dropped = 1;
@@ -717,7 +678,7 @@ int32_t dndProcessAuthVnodeReq(SDnode *pDnode, SRpcMsg *pReq) {
   SVnodeObj *pVnode = dndAcquireVnode(pDnode, vgId);
   if (pVnode == NULL) {
     dDebug("vgId:%d, failed to auth since %s", vgId, terrstr());
-    return terrno;
+    return -1;
   }
 
   pVnode->accessState = pAuth->accessState;
@@ -821,6 +782,7 @@ static void dndProcessVnodeApplyQueue(SVnodeObj *pVnode, STaosQall *qall, int32_
   for (int32_t i = 0; i < numOfMsgs; ++i) {
     taosGetQitem(qall, (void **)&pMsg);
 
+    // todo
     SRpcMsg *pRsp = NULL;
     (void)vnodeApplyWMsg(pVnode->pImpl, pMsg, &pRsp);
   }
@@ -832,6 +794,7 @@ static void dndProcessVnodeSyncQueue(SVnodeObj *pVnode, STaosQall *qall, int32_t
   for (int32_t i = 0; i < numOfMsgs; ++i) {
     taosGetQitem(qall, (void **)&pMsg);
 
+    // todo
     SRpcMsg *pRsp = NULL;
     (void)vnodeProcessSyncReq(pVnode->pImpl, pMsg, &pRsp);
   }
@@ -855,21 +818,25 @@ static int32_t dndWriteRpcMsgToVnodeQueue(STaosQueue *pQueue, SRpcMsg *pRpcMsg)
   }
 
   if (code != TSDB_CODE_SUCCESS) {
-    SRpcMsg rsp = {.handle = pRpcMsg->handle, .code = code};
-    rpcSendResponse(&rsp);
+    if (pRpcMsg->msgType & 1u) {
+      SRpcMsg rsp = {.handle = pRpcMsg->handle, .code = code};
+      rpcSendResponse(&rsp);
+    }
     rpcFreeCont(pRpcMsg->pCont);
   }
 }
 
 static SVnodeObj *dndAcquireVnodeFromMsg(SDnode *pDnode, SRpcMsg *pMsg) {
-  SMsgHead *pHead = (SMsgHead *)pMsg->pCont;
+  SMsgHead *pHead = pMsg->pCont;
   pHead->contLen = htonl(pHead->contLen);
   pHead->vgId = htonl(pHead->vgId);
 
   SVnodeObj *pVnode = dndAcquireVnode(pDnode, pHead->vgId);
   if (pVnode == NULL) {
-    SRpcMsg rsp = {.handle = pMsg->handle, .code = TSDB_CODE_VND_INVALID_VGROUP_ID};
-    rpcSendResponse(&rsp);
+    if (pMsg->msgType & 1u) {
+      SRpcMsg rsp = {.handle = pMsg->handle, .code = TSDB_CODE_VND_INVALID_VGROUP_ID};
+      rpcSendResponse(&rsp);
+    }
     rpcFreeCont(pMsg->pCont);
   }
 
@@ -910,193 +877,96 @@ void dndProcessVnodeFetchMsg(SDnode *pDnode, SRpcMsg *pMsg, SEpSet *pEpSet) {
 
 static int32_t dndPutMsgIntoVnodeApplyQueue(SDnode *pDnode, int32_t vgId, SRpcMsg *pMsg) {
   SVnodeObj *pVnode = dndAcquireVnode(pDnode, vgId);
-  if (pVnode == NULL) {
-    return -1;
-  }
+  if (pVnode == NULL) return -1;
 
   int32_t code = taosWriteQitem(pVnode->pApplyQ, pMsg);
   dndReleaseVnode(pDnode, pVnode);
   return code;
 }
 
-static int32_t dndAllocVnodeQueryQueue(SDnode *pDnode, SVnodeObj *pVnode) {
-  SVnodesMgmt *pMgmt = &pDnode->vmgmt;
-  pVnode->pQueryQ = tWorkerAllocQueue(&pMgmt->queryPool, pVnode, (FProcessItem)dndProcessVnodeQueryQueue);
-  if (pVnode->pQueryQ == NULL) {
-    terrno = TSDB_CODE_OUT_OF_MEMORY;
-    return -1;
-  }
-
-  return 0;
-}
-
-static void dndFreeVnodeQueryQueue(SDnode *pDnode, SVnodeObj *pVnode) {
-  SVnodesMgmt *pMgmt = &pDnode->vmgmt;
-  tWorkerFreeQueue(&pMgmt->queryPool, pVnode->pQueryQ);
-  pVnode->pQueryQ = NULL;
-}
-
-static int32_t dndAllocVnodeFetchQueue(SDnode *pDnode, SVnodeObj *pVnode) {
-  SVnodesMgmt *pMgmt = &pDnode->vmgmt;
-  pVnode->pFetchQ = tWorkerAllocQueue(&pMgmt->fetchPool, pVnode, (FProcessItem)dndProcessVnodeFetchQueue);
-  if (pVnode->pFetchQ == NULL) {
-    terrno = TSDB_CODE_OUT_OF_MEMORY;
-    return -1;
-  }
-
-  return 0;
-}
-
-static void dndFreeVnodeFetchQueue(SDnode *pDnode, SVnodeObj *pVnode) {
-  SVnodesMgmt *pMgmt = &pDnode->vmgmt;
-  tWorkerFreeQueue(&pMgmt->fetchPool, pVnode->pFetchQ);
-  pVnode->pFetchQ = NULL;
-}
-
-static int32_t dndInitVnodeReadWorker(SDnode *pDnode) {
+static int32_t dndInitVnodeWorkers(SDnode *pDnode) {
   SVnodesMgmt *pMgmt = &pDnode->vmgmt;
 
   int32_t maxFetchThreads = 4;
-  float   threadsForQuery = MAX(pDnode->opt.numOfCores * pDnode->opt.ratioOfQueryCores, 1);
+  int32_t minFetchThreads = MIN(maxFetchThreads, pDnode->opt.numOfCores);
+  int32_t minQueryThreads = MAX((int32_t)(pDnode->opt.numOfCores * pDnode->opt.ratioOfQueryCores), 1);
+  int32_t maxQueryThreads = minQueryThreads;
+  int32_t maxWriteThreads = MAX(pDnode->opt.numOfCores, 1);
+  int32_t maxSyncThreads = MAX(pDnode->opt.numOfCores / 2, 1);
 
   SWorkerPool *pPool = &pMgmt->queryPool;
   pPool->name = "vnode-query";
-  pPool->min = (int32_t)threadsForQuery;
-  pPool->max = pPool->min;
-  if (tWorkerInit(pPool) != 0) {
-    terrno = TSDB_CODE_OUT_OF_MEMORY;
-    return -1;
-  }
+  pPool->min = minQueryThreads;
+  pPool->max = maxQueryThreads;
+  if (tWorkerInit(pPool) != 0) return -1;
 
   pPool = &pMgmt->fetchPool;
   pPool->name = "vnode-fetch";
-  pPool->min = MIN(maxFetchThreads, pDnode->opt.numOfCores);
-  pPool->max = pPool->min;
-  if (tWorkerInit(pPool) != 0) {
-    terrno = TSDB_CODE_OUT_OF_MEMORY;
-    return -1;
-  }
+  pPool->min = minFetchThreads;
+  pPool->max = maxFetchThreads;
+  if (tWorkerInit(pPool) != 0) return -1;
 
-  dDebug("vnode read worker is initialized");
+  SMWorkerPool *pMPool = &pMgmt->writePool;
+  pMPool->name = "vnode-write";
+  pMPool->max = maxWriteThreads;
+  if (tMWorkerInit(pMPool) != 0) return -1;
+
+  pMPool = &pMgmt->syncPool;
+  pMPool->name = "vnode-sync";
+  pMPool->max = maxSyncThreads;
+  if (tMWorkerInit(pMPool) != 0) return -1;
+
+  dDebug("vnode workers is initialized");
   return 0;
 }
 
-static void dndCleanupVnodeReadWorker(SDnode *pDnode) {
+static void dndCleanupVnodeWorkers(SDnode *pDnode) {
   SVnodesMgmt *pMgmt = &pDnode->vmgmt;
   tWorkerCleanup(&pMgmt->fetchPool);
   tWorkerCleanup(&pMgmt->queryPool);
-  dDebug("vnode close worker is initialized");
-}
-
-static int32_t dndAllocVnodeWriteQueue(SDnode *pDnode, SVnodeObj *pVnode) {
-  SVnodesMgmt *pMgmt = &pDnode->vmgmt;
-  pVnode->pWriteQ = tMWorkerAllocQueue(&pMgmt->writePool, pVnode, (FProcessItems)dndProcessVnodeWriteQueue);
-  if (pVnode->pWriteQ == NULL) {
-    terrno = TSDB_CODE_OUT_OF_MEMORY;
-    return -1;
-  }
-
-  return 0;
-}
-
-static void dndFreeVnodeWriteQueue(SDnode *pDnode, SVnodeObj *pVnode) {
-  SVnodesMgmt *pMgmt = &pDnode->vmgmt;
-  tMWorkerFreeQueue(&pMgmt->writePool, pVnode->pWriteQ);
-  pVnode->pWriteQ = NULL;
-}
-
-static int32_t dndAllocVnodeApplyQueue(SDnode *pDnode, SVnodeObj *pVnode) {
-  SVnodesMgmt *pMgmt = &pDnode->vmgmt;
-  pVnode->pApplyQ = tMWorkerAllocQueue(&pMgmt->writePool, pVnode, (FProcessItems)dndProcessVnodeApplyQueue);
-  if (pVnode->pApplyQ == NULL) {
-    terrno = TSDB_CODE_OUT_OF_MEMORY;
-    return -1;
-  }
-
-  return 0;
-}
-
-static void dndFreeVnodeApplyQueue(SDnode *pDnode, SVnodeObj *pVnode) {
-  SVnodesMgmt *pMgmt = &pDnode->vmgmt;
-  tMWorkerFreeQueue(&pMgmt->writePool, pVnode->pApplyQ);
-  pVnode->pApplyQ = NULL;
-}
-
-static int32_t dndInitVnodeWriteWorker(SDnode *pDnode) {
-  SVnodesMgmt  *pMgmt = &pDnode->vmgmt;
-  SMWorkerPool *pPool = &pMgmt->writePool;
-  pPool->name = "vnode-write";
-  pPool->max = pDnode->opt.numOfCores;
-  if (tMWorkerInit(pPool) != 0) {
-    terrno = TSDB_CODE_OUT_OF_MEMORY;
-    return -1;
-  }
-
-  dDebug("vnode write worker is initialized");
-  return 0;
-}
-
-static void dndCleanupVnodeWriteWorker(SDnode *pDnode) {
-  SVnodesMgmt *pMgmt = &pDnode->vmgmt;
   tMWorkerCleanup(&pMgmt->writePool);
-  dDebug("vnode write worker is closed");
-}
-
-static int32_t dndAllocVnodeSyncQueue(SDnode *pDnode, SVnodeObj *pVnode) {
-  SVnodesMgmt *pMgmt = &pDnode->vmgmt;
-  pVnode->pSyncQ = tMWorkerAllocQueue(&pMgmt->syncPool, pVnode, (FProcessItems)dndProcessVnodeSyncQueue);
-  if (pVnode->pSyncQ == NULL) {
-    terrno = TSDB_CODE_OUT_OF_MEMORY;
-    return -1;
-  }
-
-  return 0;
-}
-
-static void dndFreeVnodeSyncQueue(SDnode *pDnode, SVnodeObj *pVnode) {
-  SVnodesMgmt *pMgmt = &pDnode->vmgmt;
-  tMWorkerFreeQueue(&pMgmt->syncPool, pVnode->pSyncQ);
-  pVnode->pSyncQ = NULL;
-}
-
-static int32_t dndInitVnodeSyncWorker(SDnode *pDnode) {
-  int32_t maxThreads = pDnode->opt.numOfCores / 2;
-  if (maxThreads < 1) maxThreads = 1;
-
-  SVnodesMgmt  *pMgmt = &pDnode->vmgmt;
-  SMWorkerPool *pPool = &pMgmt->syncPool;
-  pPool->name = "vnode-sync";
-  pPool->max = maxThreads;
-  if (tMWorkerInit(pPool) != 0) {
-    terrno = TSDB_CODE_OUT_OF_MEMORY;
-    return -1;
-  }
-
-  dDebug("vnode sync worker is initialized");
-  return 0;
-}
-
-static void dndCleanupVnodeSyncWorker(SDnode *pDnode) {
-  SVnodesMgmt *pMgmt = &pDnode->vmgmt;
   tMWorkerCleanup(&pMgmt->syncPool);
-  dDebug("vnode sync worker is closed");
+  dDebug("vnode workers is closed");
+}
+
+static int32_t dndAllocVnodeQueue(SDnode *pDnode, SVnodeObj *pVnode) {
+  SVnodesMgmt *pMgmt = &pDnode->vmgmt;
+
+  pVnode->pWriteQ = tMWorkerAllocQueue(&pMgmt->writePool, pVnode, (FProcessItems)dndProcessVnodeWriteQueue);
+  pVnode->pApplyQ = tMWorkerAllocQueue(&pMgmt->writePool, pVnode, (FProcessItems)dndProcessVnodeApplyQueue);
+  pVnode->pSyncQ = tMWorkerAllocQueue(&pMgmt->syncPool, pVnode, (FProcessItems)dndProcessVnodeSyncQueue);
+  pVnode->pFetchQ = tWorkerAllocQueue(&pMgmt->fetchPool, pVnode, (FProcessItem)dndProcessVnodeFetchQueue);
+  pVnode->pQueryQ = tWorkerAllocQueue(&pMgmt->queryPool, pVnode, (FProcessItem)dndProcessVnodeQueryQueue);
+
+  if (pVnode->pApplyQ == NULL || pVnode->pWriteQ == NULL || pVnode->pSyncQ == NULL || pVnode->pFetchQ == NULL ||
+      pVnode->pQueryQ == NULL) {
+    terrno = TSDB_CODE_OUT_OF_MEMORY;
+    return -1;
+  }
+
+  return 0;
+}
+
+static void dndFreeVnodeQueue(SDnode *pDnode, SVnodeObj *pVnode) {
+  SVnodesMgmt *pMgmt = &pDnode->vmgmt;
+  tWorkerFreeQueue(&pMgmt->queryPool, pVnode->pQueryQ);
+  tWorkerFreeQueue(&pMgmt->fetchPool, pVnode->pFetchQ);
+  tMWorkerFreeQueue(&pMgmt->writePool, pVnode->pWriteQ);
+  tMWorkerFreeQueue(&pMgmt->writePool, pVnode->pApplyQ);
+  tMWorkerFreeQueue(&pMgmt->syncPool, pVnode->pSyncQ);
+  pVnode->pWriteQ = NULL;
+  pVnode->pApplyQ = NULL;
+  pVnode->pSyncQ = NULL;
+  pVnode->pFetchQ = NULL;
+  pVnode->pQueryQ = NULL;
 }
 
 int32_t dndInitVnodes(SDnode *pDnode) {
   dInfo("dnode-vnodes start to init");
 
-  if (dndInitVnodeReadWorker(pDnode) != 0) {
-    dError("failed to init vnodes read worker since %s", terrstr());
-    return -1;
-  }
-
-  if (dndInitVnodeWriteWorker(pDnode) != 0) {
-    dError("failed to init vnodes write worker since %s", terrstr());
-    return -1;
-  }
-
-  if (dndInitVnodeSyncWorker(pDnode) != 0) {
-    dError("failed to init vnodes sync worker since %s", terrstr());
+  if (dndInitVnodeWorkers(pDnode) != 0) {
+    terrno = TSDB_CODE_OUT_OF_MEMORY;
+    dError("failed to init vnode workers since %s", terrstr());
     return -1;
   }
 
@@ -1112,9 +982,7 @@ int32_t dndInitVnodes(SDnode *pDnode) {
 void dndCleanupVnodes(SDnode *pDnode) {
   dInfo("dnode-vnodes start to clean up");
   dndCloseVnodes(pDnode);
-  dndCleanupVnodeReadWorker(pDnode);
-  dndCleanupVnodeWriteWorker(pDnode);
-  dndCleanupVnodeSyncWorker(pDnode);
+  dndCleanupVnodeWorkers(pDnode);
   dInfo("dnode-vnodes is cleaned up");
 }
 
diff --git a/source/dnode/vnode/impl/src/vnodeMain.c b/source/dnode/vnode/impl/src/vnodeMain.c
index c87749203a..88175646ae 100644
--- a/source/dnode/vnode/impl/src/vnodeMain.c
+++ b/source/dnode/vnode/impl/src/vnodeMain.c
@@ -20,12 +20,13 @@ static void    vnodeFree(SVnode *pVnode);
 static int     vnodeOpenImpl(SVnode *pVnode);
 static void    vnodeCloseImpl(SVnode *pVnode);
 
-SVnode *vnodeOpen(const char *path, const SVnodeCfg *pVnodeCfgInput) {
+SVnode *vnodeOpen(const char *path, const SVnodeCfg *pVnodeCfg) {
   SVnode *pVnode = NULL;
 
   // Set default options
-  SVnodeCfg *pVnodeCfg = &defaultVnodeOptions;
-  pVnodeCfg->vgId = pVnodeCfg->vgId;
+  if (pVnodeCfg == NULL) {
+    pVnodeCfg = &defaultVnodeOptions;
+  }
 
   // Validate options
   if (vnodeValidateOptions(pVnodeCfg) < 0) {