diff --git a/include/common/taosmsg.h b/include/common/taosmsg.h
index 49e8892c7da8e2a95b1531d3050a87c6e9453c2a..822f850018c313c0c9f2cb1358ec082b98ff25ba 100644
--- a/include/common/taosmsg.h
+++ b/include/common/taosmsg.h
@@ -655,8 +655,8 @@ typedef struct {
 } SVnodeLoad;
 
 typedef struct {
-  int32_t    vnodeNum;
-  SVnodeLoad vnodeLoads[];
+  int32_t    num;
+  SVnodeLoad data[];
 } SVnodeLoads;
 
 typedef struct SStatusMsg {
diff --git a/include/server/vnode/vnode.h b/include/server/vnode/vnode.h
index a20a7fd410bf29cf9fa12d02592c5642850cc335..ca0706f0b952d46da09f9d806cdc800309115a98 100644
--- a/include/server/vnode/vnode.h
+++ b/include/server/vnode/vnode.h
@@ -47,12 +47,18 @@ typedef struct {
   SVnodeDesc replicas[TSDB_MAX_REPLICA];
 } SVnodeCfg;
 
+typedef enum {
+  VN_MSG_TYPE_WRITE = 1,
+  VN_MSG_TYPE_APPLY,
+  VN_MSG_TYPE_SYNC,
+  VN_MSG_TYPE_QUERY,
+  VN_MSG_TYPE_FETCH
+} EVMType;
+
 typedef struct SVnodeMsg {
-  int32_t msgType;
-  int32_t code;
-  SRpcMsg rpcMsg;  // original message from rpc
-  int32_t contLen;
-  char    pCont[];
+  int32_t curNum;
+  int32_t allocNum;
+  SRpcMsg rpcMsg[];
 } SVnodeMsg;
 
 int32_t vnodeInit();
@@ -67,7 +73,11 @@ int32_t vnodeCompact(SVnode *pVnode);
 int32_t vnodeSync(SVnode *pVnode);
 
 void vnodeGetLoad(SVnode *pVnode, SVnodeLoad *pLoad);
-void vnodeProcessMsg(SVnode *pVnode, SVnodeMsg *pMsg);
+
+SVnodeMsg *vnodeInitMsg(int32_t msgNum);
+int32_t    vnodeAppendMsg(SVnodeMsg *pMsg, SRpcMsg *pRpcMsg);
+void       vnodeCleanupMsg(SVnodeMsg *pMsg);
+void       vnodeProcessMsg(SVnode *pVnode, SVnodeMsg *pMsg, EVMType msgType);
 
 #ifdef __cplusplus
 }
diff --git a/include/util/tqueue.h b/include/util/tqueue.h
index faac1afe705c95218cceb17117d93fd01c06e0e7..24c56ea6a3bda993eb34f4b9b2e1a087f94b32dc 100644
--- a/include/util/tqueue.h
+++ b/include/util/tqueue.h
@@ -40,8 +40,8 @@ shall be used to set up the protection.
 typedef void *taos_queue;
 typedef void *taos_qset;
 typedef void *taos_qall;
-typedef void *(*FProcessItem)(void *pItem, void *ahandle);
-typedef void *(*FProcessItems)(taos_qall qall, int numOfItems, void *ahandle);
+typedef void (*FProcessItem)(void *ahandle, void *pItem);
+typedef void (*FProcessItems)(void *ahandle, taos_qall qall, int numOfItems);
 
 taos_queue taosOpenQueue();
 void       taosCloseQueue(taos_queue);
diff --git a/source/dnode/mgmt/inc/dnodeVnodes.h b/source/dnode/mgmt/inc/dnodeVnodes.h
index 2b72ba5d597a593888a9ab05a26972fe8978b8b4..31eae049abd392dc4e1105732fa1a2120769a07b 100644
--- a/source/dnode/mgmt/inc/dnodeVnodes.h
+++ b/source/dnode/mgmt/inc/dnodeVnodes.h
@@ -23,7 +23,7 @@ extern "C" {
 
 int32_t dnodeInitVnodes();
 void    dnodeCleanupVnodes();
-void    dnodeGetVnodes(SVnodeLoads *pVloads);
+void    dnodeGetVnodeLoads(SVnodeLoads *pVloads);
 
 void dnodeProcessVnodeMgmtMsg(SRpcMsg *pMsg, SEpSet *pEpSet);
 void dnodeProcessVnodeWriteMsg(SRpcMsg *pMsg, SEpSet *pEpSet);
diff --git a/source/dnode/mgmt/src/dnodeDnode.c b/source/dnode/mgmt/src/dnodeDnode.c
index 5bf5b1d56a0af9e3c5462f1bd76e959ef662dfa2..63de2b940d87d027da4f84e5eab58544443ac698 100644
--- a/source/dnode/mgmt/src/dnodeDnode.c
+++ b/source/dnode/mgmt/src/dnodeDnode.c
@@ -372,8 +372,8 @@ static void dnodeSendStatusMsg() {
   char timestr[32] = "1970-01-01 00:00:00.00";
   (void)taosParseTime(timestr, &pStatus->clusterCfg.checkTime, (int32_t)strlen(timestr), TSDB_TIME_PRECISION_MILLI, 0);
 
-  dnodeGetVnodes(&pStatus->vnodeLoads);
-  contLen = sizeof(SStatusMsg) + pStatus->vnodeLoads.vnodeNum * sizeof(SVnodeLoad);
+  dnodeGetVnodeLoads(&pStatus->vnodeLoads);
+  contLen = sizeof(SStatusMsg) + pStatus->vnodeLoads.num * sizeof(SVnodeLoad);
 
   SRpcMsg rpcMsg = {.pCont = pStatus, .contLen = contLen, .msgType = TSDB_MSG_TYPE_STATUS};
   dnodeSendMsgToMnode(&rpcMsg);
diff --git a/source/dnode/mgmt/src/dnodeVnodes.c b/source/dnode/mgmt/src/dnodeVnodes.c
index c2e143da807e97fd9cb2fb5903d9132c80d45199..72048a15a5893007766fc521fd20a21d6b43140b 100644
--- a/source/dnode/mgmt/src/dnodeVnodes.c
+++ b/source/dnode/mgmt/src/dnodeVnodes.c
@@ -45,27 +45,66 @@ typedef struct {
 } SVThread;
 
 static struct {
-  SHashObj   *hash;
-  SWorkerPool mgmtPool;
-  taos_queue  pMgmtQ;
-  SSteps     *pSteps;
-  int32_t     openVnodes;
-  int32_t     totalVnodes;
-  char        file[PATH_MAX + 20];
+  SHashObj    *hash;
+  SWorkerPool  mgmtPool;
+  SWorkerPool  queryPool;
+  SWorkerPool  fetchPool;
+  SMWorkerPool syncPool;
+  SMWorkerPool writePool;
+  taos_queue   pMgmtQ;
+  SSteps      *pSteps;
+  int32_t      openVnodes;
+  int32_t      totalVnodes;
+  char         file[PATH_MAX + 20];
 } tsVnodes;
 
+static int32_t dnodeAllocVnodeQueryQueue(SVnodeObj *pVnode);
+static void    dnodeFreeVnodeQueryQueue(SVnodeObj *pVnode);
+static int32_t dnodeAllocVnodeFetchQueue(SVnodeObj *pVnode);
+static void    dnodeFreeVnodeFetchQueue(SVnodeObj *pVnode);
+static int32_t dnodeAllocVnodeWriteQueue(SVnodeObj *pVnode);
+static void    dnodeFreeVnodeWriteQueue(SVnodeObj *pVnode);
+static int32_t dnodeAllocVnodeApplyQueue(SVnodeObj *pVnode);
+static void    dnodeFreeVnodeApplyQueue(SVnodeObj *pVnode);
+static int32_t dnodeAllocVnodeSyncQueue(SVnodeObj *pVnode);
+static void    dnodeFreeVnodeSyncQueue(SVnodeObj *pVnode);
+
 static int32_t dnodeCreateVnodeWrapper(int32_t vgId, SVnode *pImpl) {
   SVnodeObj *pVnode = calloc(1, sizeof(SVnodeObj));
+  if (pVnode == NULL) {
+    return TSDB_CODE_DND_OUT_OF_MEMORY;
+  }
+
   pVnode->vgId = vgId;
   pVnode->refCount = 0;
   pVnode->dropped = 0;
   pVnode->accessState = TSDB_VN_ALL_ACCCESS;
   pVnode->pImpl = pImpl;
-  pVnode->pWriteQ = NULL;
-  pVnode->pSyncQ = NULL;
-  pVnode->pApplyQ = NULL;
-  pVnode->pQueryQ = NULL;
-  pVnode->pFetchQ = NULL;
+
+  int32_t code = dnodeAllocVnodeQueryQueue(pVnode);
+  if (code != 0) {
+    return code;
+  }
+
+  code = dnodeAllocVnodeFetchQueue(pVnode);
+  if (code != 0) {
+    return code;
+  }
+
+  code = dnodeAllocVnodeWriteQueue(pVnode);
+  if (code != 0) {
+    return code;
+  }
+
+  code = dnodeAllocVnodeApplyQueue(pVnode);
+  if (code != 0) {
+    return code;
+  }
+
+  code = dnodeAllocVnodeSyncQueue(pVnode);
+  if (code != 0) {
+    return code;
+  }
 
   return taosHashPut(tsVnodes.hash, &vgId, sizeof(int32_t), &pVnode, sizeof(SVnodeObj *));
 }
@@ -74,11 +113,11 @@ static void dnodeDropVnodeWrapper(SVnodeObj *pVnode) {
   taosHashRemove(tsVnodes.hash, &pVnode->vgId, sizeof(int32_t));
 
   //todo wait all queue empty
-  pVnode->pWriteQ = NULL;
-  pVnode->pSyncQ = NULL;
-  pVnode->pApplyQ = NULL;
-  pVnode->pQueryQ = NULL;
-  pVnode->pFetchQ = NULL;
+  dnodeFreeVnodeQueryQueue(pVnode);
+  dnodeFreeVnodeFetchQueue(pVnode);
+  dnodeFreeVnodeWriteQueue(pVnode);
+  dnodeFreeVnodeApplyQueue(pVnode);
+  dnodeFreeVnodeSyncQueue(pVnode);
 }
 
 static int32_t dnodeGetVnodesFromHash(SVnodeObj *pVnodes[], int32_t *numOfVnodes) {
@@ -465,7 +504,7 @@ static int32_t vnodeProcessCompactVnodeReq(SRpcMsg *rpcMsg) {
   return code;
 }
 
-static void dnodeProcessVnodeMgmtReq(SRpcMsg *pMsg, void *unused) {
+static void dnodeProcessVnodeMgmtQueue(void *unused, SRpcMsg *pMsg) {
   int32_t code = 0;
 
   switch (pMsg->msgType) {
@@ -498,7 +537,44 @@ static void dnodeProcessVnodeMgmtReq(SRpcMsg *pMsg, void *unused) {
   taosFreeQitem(pMsg);
 }
 
-static int32_t dnodeWriteToVnodeQueue(taos_queue pQueue, SRpcMsg *pRpcMsg) {
+static void dnodeProcessVnodeQueryQueue(SVnodeObj *pVnode, SVnodeMsg *pMsg) {
+  vnodeProcessMsg(pVnode->pImpl, pMsg, VN_MSG_TYPE_QUERY);
+}
+
+static void dnodeProcessVnodeFetchQueue(SVnodeObj *pVnode, SVnodeMsg *pMsg) {
+  vnodeProcessMsg(pVnode->pImpl, pMsg, VN_MSG_TYPE_FETCH);
+}
+
+static void dnodeProcessVnodeWriteQueue(SVnodeObj *pVnode, taos_qall qall, int32_t numOfMsgs) {
+  SVnodeMsg *pMsg = vnodeInitMsg(numOfMsgs);
+  SRpcMsg   *pRpcMsg = NULL;
+
+  for (int32_t i = 0; i < numOfMsgs; ++i) {
+    taosGetQitem(qall, (void **)&pRpcMsg);
+    vnodeAppendMsg(pMsg, pRpcMsg);
+    taosFreeQitem(pRpcMsg);
+  }
+
+  vnodeProcessMsg(pVnode->pImpl, pMsg, VN_MSG_TYPE_WRITE);
+}
+
+static void dnodeProcessVnodeApplyQueue(SVnodeObj *pVnode, taos_qall qall, int32_t numOfMsgs) {
+  SVnodeMsg *pMsg = NULL;
+  for (int32_t i = 0; i < numOfMsgs; ++i) {
+    taosGetQitem(qall, (void **)&pMsg);
+    vnodeProcessMsg(pVnode->pImpl, pMsg, VN_MSG_TYPE_APPLY);
+  }
+}
+
+static void dnodeProcessVnodeSyncQueue(SVnodeObj *pVnode, taos_qall qall, int32_t numOfMsgs) {
+  SVnodeMsg *pMsg = NULL;
+  for (int32_t i = 0; i < numOfMsgs; ++i) {
+    taosGetQitem(qall, (void **)&pMsg);
+    vnodeProcessMsg(pVnode->pImpl, pMsg, VN_MSG_TYPE_SYNC);
+  }
+}
+
+static int32_t dnodeWriteRpcMsgToVnodeQueue(taos_queue pQueue, SRpcMsg *pRpcMsg) {
   int32_t code = 0;
 
   if (pQueue == NULL) {
@@ -520,6 +596,28 @@ static int32_t dnodeWriteToVnodeQueue(taos_queue pQueue, SRpcMsg *pRpcMsg) {
   }
 }
 
+static int32_t dnodeWriteVnodeMsgToVnodeQueue(taos_queue pQueue, SRpcMsg *pRpcMsg) {
+  int32_t code = 0;
+
+  if (pQueue == NULL) {
+    code = TSDB_CODE_DND_MSG_NOT_PROCESSED;
+  } else {
+    SVnodeMsg *pMsg = vnodeInitMsg(1);
+    if (pMsg == NULL) {
+      code = TSDB_CODE_DND_OUT_OF_MEMORY;
+    } else {
+      vnodeAppendMsg(pMsg, pRpcMsg);
+      code = taosWriteQitem(pQueue, pMsg);
+    }
+  }
+
+  if (code != TSDB_CODE_SUCCESS) {
+    SRpcMsg rsp = {.handle = pRpcMsg->handle, .code = code};
+    rpcSendResponse(&rsp);
+    rpcFreeCont(pRpcMsg->pCont);
+  }
+}
+
 static SVnodeObj *dnodeAcquireVnodeFromMsg(SRpcMsg *pMsg) {
   SMsgHead *pHead = (SMsgHead *)pMsg->pCont;
   pHead->vgId = htonl(pHead->vgId);
@@ -534,12 +632,12 @@ static SVnodeObj *dnodeAcquireVnodeFromMsg(SRpcMsg *pMsg) {
   return pVnode;
 }
 
-void dnodeProcessVnodeMgmtMsg(SRpcMsg *pMsg, SEpSet *pEpSet) { dnodeWriteToVnodeQueue(tsVnodes.pMgmtQ, pMsg); }
+void dnodeProcessVnodeMgmtMsg(SRpcMsg *pMsg, SEpSet *pEpSet) { dnodeWriteRpcMsgToVnodeQueue(tsVnodes.pMgmtQ, pMsg); }
 
 void dnodeProcessVnodeWriteMsg(SRpcMsg *pMsg, SEpSet *pEpSet) {
   SVnodeObj *pVnode = dnodeAcquireVnodeFromMsg(pMsg);
   if (pVnode != NULL) {
-    dnodeWriteToVnodeQueue(pVnode->pWriteQ, pMsg);
+    dnodeWriteRpcMsgToVnodeQueue(pVnode->pWriteQ, pMsg);
     dnodeReleaseVnode(pVnode);
   }
 }
@@ -547,7 +645,7 @@ void dnodeProcessVnodeWriteMsg(SRpcMsg *pMsg, SEpSet *pEpSet) {
 void dnodeProcessVnodeSyncMsg(SRpcMsg *pMsg, SEpSet *pEpSet) {
   SVnodeObj *pVnode = dnodeAcquireVnodeFromMsg(pMsg);
   if (pVnode != NULL) {
-    dnodeWriteToVnodeQueue(pVnode->pSyncQ, pMsg);
+    dnodeWriteVnodeMsgToVnodeQueue(pVnode->pSyncQ, pMsg);
     dnodeReleaseVnode(pVnode);
   }
 }
@@ -555,7 +653,7 @@ void dnodeProcessVnodeSyncMsg(SRpcMsg *pMsg, SEpSet *pEpSet) {
 void dnodeProcessVnodeQueryMsg(SRpcMsg *pMsg, SEpSet *pEpSet) {
   SVnodeObj *pVnode = dnodeAcquireVnodeFromMsg(pMsg);
   if (pVnode != NULL) {
-    dnodeWriteToVnodeQueue(pVnode->pQueryQ, pMsg);
+    dnodeWriteVnodeMsgToVnodeQueue(pVnode->pQueryQ, pMsg);
     dnodeReleaseVnode(pVnode);
   }
 }
@@ -563,7 +661,7 @@ void dnodeProcessVnodeQueryMsg(SRpcMsg *pMsg, SEpSet *pEpSet) {
 void dnodeProcessVnodeFetchMsg(SRpcMsg *pMsg, SEpSet *pEpSet) {
   SVnodeObj *pVnode = dnodeAcquireVnodeFromMsg(pMsg);
   if (pVnode != NULL) {
-    dnodeWriteToVnodeQueue(pVnode->pFetchQ, pMsg);
+    dnodeWriteVnodeMsgToVnodeQueue(pVnode->pFetchQ, pMsg);
     dnodeReleaseVnode(pVnode);
   }
 }
@@ -577,7 +675,7 @@ static int32_t dnodeInitVnodeMgmtWorker() {
     return TSDB_CODE_VND_OUT_OF_MEMORY;
   }
 
-  tsVnodes.pMgmtQ = tWorkerAllocQueue(pPool, NULL, (FProcessItem)dnodeProcessVnodeMgmtReq);
+  tsVnodes.pMgmtQ = tWorkerAllocQueue(pPool, NULL, (FProcessItem)dnodeProcessVnodeMgmtQueue);
   if (tsVnodes.pMgmtQ == NULL) {
     return TSDB_CODE_VND_OUT_OF_MEMORY;
   }
@@ -591,12 +689,137 @@ static void dnodeCleanupVnodeMgmtWorker() {
   tsVnodes.pMgmtQ = NULL;
 }
 
+static int32_t dnodeAllocVnodeQueryQueue(SVnodeObj *pVnode) {
+  pVnode->pQueryQ = tWorkerAllocQueue(&tsVnodes.queryPool, pVnode, (FProcessItem)dnodeProcessVnodeQueryQueue);
+  if (pVnode->pQueryQ == NULL) {
+    return TSDB_CODE_DND_OUT_OF_MEMORY;
+  }
+  return 0;
+}
+
+static void dnodeFreeVnodeQueryQueue(SVnodeObj *pVnode) {
+  tWorkerFreeQueue(&tsVnodes.queryPool, pVnode->pQueryQ);
+  pVnode->pQueryQ = NULL;
+}
+
+static int32_t dnodeAllocVnodeFetchQueue(SVnodeObj *pVnode) {
+  pVnode->pFetchQ = tWorkerAllocQueue(&tsVnodes.fetchPool, pVnode, (FProcessItem)dnodeProcessVnodeFetchQueue);
+  if (pVnode->pFetchQ == NULL) {
+    return TSDB_CODE_DND_OUT_OF_MEMORY;
+  }
+  return 0;
+}
+
+static void dnodeFreeVnodeFetchQueue(SVnodeObj *pVnode) {
+  tWorkerFreeQueue(&tsVnodes.fetchPool, pVnode->pFetchQ);
+  pVnode->pFetchQ = NULL;
+}
+
+static int32_t dnodeInitVnodeReadWorker() {
+  int32_t maxFetchThreads = 4;
+  float   threadsForQuery = MAX(tsNumOfCores * tsRatioOfQueryCores, 1);
+
+  SWorkerPool *pPool = &tsVnodes.queryPool;
+  pPool->name = "vnode-query";
+  pPool->min = (int32_t)threadsForQuery;
+  pPool->max = pPool->min;
+  if (tWorkerInit(pPool) != 0) {
+    return TSDB_CODE_VND_OUT_OF_MEMORY;
+  }
+
+  pPool = &tsVnodes.fetchPool;
+  pPool->name = "vnode-fetch";
+  pPool->min = MIN(maxFetchThreads, tsNumOfCores);
+  pPool->max = pPool->min;
+  if (tWorkerInit(pPool) != 0) {
+    TSDB_CODE_VND_OUT_OF_MEMORY;
+  }
+
+  return 0;
+}
+
+static void dnodeCleanupVnodeReadWorker() {
+  tWorkerCleanup(&tsVnodes.fetchPool);
+  tWorkerCleanup(&tsVnodes.queryPool);
+}
+
+static int32_t dnodeAllocVnodeWriteQueue(SVnodeObj *pVnode) {
+  pVnode->pWriteQ = tMWorkerAllocQueue(&tsVnodes.writePool, pVnode, (FProcessItems)dnodeProcessVnodeWriteQueue);
+  if (pVnode->pWriteQ == NULL) {
+    return TSDB_CODE_DND_OUT_OF_MEMORY;
+  }
+  return 0;
+}
+
+static void dnodeFreeVnodeWriteQueue(SVnodeObj *pVnode) {
+  tMWorkerFreeQueue(&tsVnodes.writePool, pVnode->pWriteQ);
+  pVnode->pWriteQ = NULL;
+}
+
+static int32_t dnodeAllocVnodeApplyQueue(SVnodeObj *pVnode) {
+  pVnode->pApplyQ = tMWorkerAllocQueue(&tsVnodes.writePool, pVnode, (FProcessItems)dnodeProcessVnodeApplyQueue);
+  if (pVnode->pApplyQ == NULL) {
+    return TSDB_CODE_DND_OUT_OF_MEMORY;
+  }
+  return 0;
+}
+
+static void dnodeFreeVnodeApplyQueue(SVnodeObj *pVnode) {
+  tMWorkerFreeQueue(&tsVnodes.writePool, pVnode->pApplyQ);
+  pVnode->pApplyQ = NULL;
+}
+
+static int32_t dnodeInitVnodeWriteWorker() {
+  SMWorkerPool *pPool = &tsVnodes.writePool;
+  pPool->name = "vnode-write";
+  pPool->max = tsNumOfCores;
+  if (tMWorkerInit(pPool) != 0) {
+    return TSDB_CODE_VND_OUT_OF_MEMORY;
+  }
+
+  return 0;
+}
+
+static void dnodeCleanupVnodeWriteWorker() { tMWorkerCleanup(&tsVnodes.writePool); }
+
+static int32_t dnodeAllocVnodeSyncQueue(SVnodeObj *pVnode) {
+  pVnode->pSyncQ = tMWorkerAllocQueue(&tsVnodes.writePool, pVnode, (FProcessItems)dnodeProcessVnodeSyncQueue);
+  if (pVnode->pSyncQ == NULL) {
+    return TSDB_CODE_DND_OUT_OF_MEMORY;
+  }
+  return 0;
+}
+
+static void dnodeFreeVnodeSyncQueue(SVnodeObj *pVnode) {
+  tMWorkerFreeQueue(&tsVnodes.writePool, pVnode->pSyncQ);
+  pVnode->pSyncQ = NULL;
+}
+
+static int32_t dnodeInitVnodeSyncWorker() {
+  int32_t maxThreads = tsNumOfCores / 2;
+  if (maxThreads < 1) maxThreads = 1;
+
+  SMWorkerPool *pPool = &tsVnodes.writePool;
+  pPool->name = "vnode-sync";
+  pPool->max = maxThreads;
+  if (tMWorkerInit(pPool) != 0) {
+    return TSDB_CODE_VND_OUT_OF_MEMORY;
+  }
+
+  return 0;
+}
+
+static void dnodeCleanupVnodeSyncWorker() { tMWorkerCleanup(&tsVnodes.syncPool); }
+
 int32_t dnodeInitVnodes() {
   dInfo("dnode-vnodes start to init");
 
   SSteps *pSteps = taosStepInit(3, dnodeReportStartup);
   taosStepAdd(pSteps, "dnode-vnode-env", vnodeInit, vnodeCleanup);
   taosStepAdd(pSteps, "dnode-vnode-mgmt", dnodeInitVnodeMgmtWorker, dnodeCleanupVnodeMgmtWorker);
+  taosStepAdd(pSteps, "dnode-vnode-read", dnodeInitVnodeReadWorker, dnodeCleanupVnodeReadWorker);
+  taosStepAdd(pSteps, "dnode-vnode-write", dnodeInitVnodeWriteWorker, dnodeCleanupVnodeWriteWorker);
+  taosStepAdd(pSteps, "dnode-vnode-sync", dnodeInitVnodeSyncWorker, dnodeCleanupVnodeSyncWorker);
   taosStepAdd(pSteps, "dnode-vnodes", dnodeOpenVnodes, dnodeCleanupVnodes);
 
   tsVnodes.pSteps = pSteps;
@@ -612,24 +835,26 @@ void dnodeCleanupVnodes() {
   }
 }
 
-void dnodeGetVnodes(SVnodeLoads *pLoads) {
-  pLoads->vnodeNum = taosHashGetSize(tsVnodes.hash);
+void dnodeGetVnodeLoads(SVnodeLoads *pLoads) {
+  pLoads->num = taosHashGetSize(tsVnodes.hash);
 
   int32_t v = 0;
   void   *pIter = taosHashIterate(tsVnodes.hash, NULL);
   while (pIter) {
     SVnodeObj **ppVnode = pIter;
     if (ppVnode == NULL) continue;
+
     SVnodeObj *pVnode = *ppVnode;
-    if (pVnode) {
-      SVnodeLoad *pLoad = &pLoads->vnodeLoads[v++];
-      vnodeGetLoad(pVnode->pImpl, pLoad);
-      pLoad->vgId = htonl(pLoad->vgId);
-      pLoad->totalStorage = htobe64(pLoad->totalStorage);
-      pLoad->compStorage = htobe64(pLoad->compStorage);
-      pLoad->pointsWritten = htobe64(pLoad->pointsWritten);
-      pLoad->tablesNum = htobe64(pLoad->tablesNum);
-    }
+    if (pVnode == NULL) continue;
+
+    SVnodeLoad *pLoad = &pLoads->data[v++];
+    vnodeGetLoad(pVnode->pImpl, pLoad);
+    pLoad->vgId = htonl(pLoad->vgId);
+    pLoad->totalStorage = htobe64(pLoad->totalStorage);
+    pLoad->compStorage = htobe64(pLoad->compStorage);
+    pLoad->pointsWritten = htobe64(pLoad->pointsWritten);
+    pLoad->tablesNum = htobe64(pLoad->tablesNum);
+
     pIter = taosHashIterate(tsVnodes.hash, pIter);
   }
-}
\ No newline at end of file
+}
diff --git a/source/dnode/vnode/impl/src/vnodeInt.c b/source/dnode/vnode/impl/src/vnodeInt.c
index 1df3d3774969f71b7d984c5d74dddb8b497178f4..c345f2e1b9b3b7b448046dc2a14b84dec3a6a7ee 100644
--- a/source/dnode/vnode/impl/src/vnodeInt.c
+++ b/source/dnode/vnode/impl/src/vnodeInt.c
@@ -15,6 +15,7 @@
 
 #define _DEFAULT_SOURCE
 #include "vnodeInt.h"
+#include "tqueue.h"
 
 int32_t vnodeInit() { return 0; }
 void    vnodeCleanup() {}
@@ -27,5 +28,45 @@ int32_t vnodeDrop(SVnode *pVnode) { return 0; }
 int32_t vnodeCompact(SVnode *pVnode) { return 0; }
 int32_t vnodeSync(SVnode *pVnode) { return 0; }
 
-void vnodeProcessMsg(SVnode *pVnode, SVnodeMsg *pMsg) {}
 void vnodeGetLoad(SVnode *pVnode, SVnodeLoad *pLoad) {}
+
+SVnodeMsg *vnodeInitMsg(int32_t msgNum) {
+  SVnodeMsg *pMsg = taosAllocateQitem(msgNum * sizeof(SRpcMsg *) + sizeof(SVnodeMsg));
+  if (pMsg == NULL) {
+    terrno = TSDB_CODE_VND_OUT_OF_MEMORY;
+    return NULL;
+  } else {
+    pMsg->allocNum = msgNum;
+    return pMsg;
+  }
+}
+
+int32_t vnodeAppendMsg(SVnodeMsg *pMsg, SRpcMsg *pRpcMsg) {
+  if (pMsg->curNum >= pMsg->allocNum) {
+    return TSDB_CODE_VND_OUT_OF_MEMORY;
+  }
+
+  pMsg->rpcMsg[pMsg->curNum++] = *pRpcMsg;
+}
+
+void vnodeCleanupMsg(SVnodeMsg *pMsg) {
+  for (int32_t i = 0; i < pMsg->curNum; ++i) {
+    rpcFreeCont(pMsg->rpcMsg[i].pCont);
+  }
+  taosFreeQitem(pMsg);
+}
+
+void vnodeProcessMsg(SVnode *pVnode, SVnodeMsg *pMsg, EVMType msgType) {
+  switch (msgType) {
+    case VN_MSG_TYPE_WRITE:
+      break;
+    case VN_MSG_TYPE_APPLY:
+      break;
+    case VN_MSG_TYPE_SYNC:
+      break;
+    case VN_MSG_TYPE_QUERY:
+      break;
+    case VN_MSG_TYPE_FETCH:
+      break;
+  }
+}
diff --git a/source/util/src/tworker.c b/source/util/src/tworker.c
index 7df12089b7d3c9b571f0c3b0b12461b6fb6e3190..136bc40482670510a99dc2008e8f04b585ee94f7 100644
--- a/source/util/src/tworker.c
+++ b/source/util/src/tworker.c
@@ -76,7 +76,7 @@ static void *tWorkerThreadFp(SWorker *worker) {
     }
 
     if (fp) {
-      (*fp)(msg, ahandle);
+      (*fp)(ahandle, msg);
     }
   }
 
@@ -186,7 +186,7 @@ static void *tWriteWorkerThreadFp(SMWorker *worker) {
     }
 
     if (fp) {
-      (*fp)(worker->qall, numOfMsgs, ahandle);
+      (*fp)(ahandle, worker->qall, numOfMsgs);
     }
   }