diff --git a/include/common/tmsg.h b/include/common/tmsg.h
index 1f7ec3be1e..cb0c76eb71 100644
--- a/include/common/tmsg.h
+++ b/include/common/tmsg.h
@@ -1527,7 +1527,6 @@ typedef struct SMqSetCVgReq {
   SArray* tasks;  // SArray<SSubQueryMsg>
 } SMqSetCVgReq;
 
-
 static FORCE_INLINE int32_t tEncodeSMqSetCVgReq(void** buf, const SMqSetCVgReq* pReq) {
   int32_t tlen = 0;
   tlen += taosEncodeFixedI32(buf, pReq->vgId);
@@ -1552,10 +1551,18 @@ static FORCE_INLINE void* tDecodeSMqSetCVgReq(void* buf, SMqSetCVgReq* pReq) {
   return buf;
 }
 
+typedef struct SMqSetCVgRsp {
+  int32_t vgId;
+  int64_t consumerId;
+  char    topicName[TSDB_TOPIC_FNAME_LEN];
+  char    cGroup[TSDB_CONSUMER_GROUP_LEN];
+} SMqSetCVgRsp;
+
 typedef struct SMqCVConsumeReq {
   int64_t reqId;
   int64_t offset;
   int64_t clientId;
+  int64_t blockingTime;
   char    topicName[TSDB_TOPIC_FNAME_LEN];
   char    cgroup[TSDB_CONSUMER_GROUP_LEN];
 } SMqCVConsumeReq;
diff --git a/include/common/tmsgdef.h b/include/common/tmsgdef.h
index ed7fdea2a8..52fff978bc 100644
--- a/include/common/tmsgdef.h
+++ b/include/common/tmsgdef.h
@@ -160,7 +160,7 @@ enum {
   TD_DEF_MSG_TYPE(TDMT_VND_MQ_QUERY, "vnode-mq-query", NULL, NULL)
   TD_DEF_MSG_TYPE(TDMT_VND_MQ_CONNECT, "vnode-mq-connect", NULL, NULL)
   TD_DEF_MSG_TYPE(TDMT_VND_MQ_DISCONNECT, "vnode-mq-disconnect", NULL, NULL)
-  TD_DEF_MSG_TYPE(TDMT_VND_MQ_SET_CONN, "vnode-mq-set-conn", NULL, NULL)
+  TD_DEF_MSG_TYPE(TDMT_VND_MQ_SET_CONN, "vnode-mq-set-conn", SMqSetCVgReq, SMqSetCVgRsp)
   TD_DEF_MSG_TYPE(TDMT_VND_MQ_SET_CUR, "vnode-mq-set-cur", NULL, NULL)
   TD_DEF_MSG_TYPE(TDMT_VND_RES_READY, "vnode-res-ready", NULL, NULL)
   TD_DEF_MSG_TYPE(TDMT_VND_TASKS_STATUS, "vnode-tasks-status", NULL, NULL)
diff --git a/include/libs/wal/wal.h b/include/libs/wal/wal.h
index 51aaa7d903..641b485f4c 100644
--- a/include/libs/wal/wal.h
+++ b/include/libs/wal/wal.h
@@ -80,8 +80,8 @@ typedef enum { TAOS_WAL_NOLOG = 0, TAOS_WAL_WRITE = 1, TAOS_WAL_FSYNC = 2 } EWal
 
 typedef struct SWalReadHead {
   int8_t  headVer;
-  uint8_t msgType;
-  int8_t  reserved[2];
+  int16_t msgType;
+  int8_t  reserved;
   int32_t len;
   int64_t ingestTs;  // not implemented
   int64_t version;
diff --git a/source/dnode/mnode/impl/src/mndSubscribe.c b/source/dnode/mnode/impl/src/mndSubscribe.c
index e786a8972c..7a57956f3b 100644
--- a/source/dnode/mnode/impl/src/mndSubscribe.c
+++ b/source/dnode/mnode/impl/src/mndSubscribe.c
@@ -95,7 +95,7 @@ static int32_t mndProcessMqTimerMsg(SMnodeMsg *pMsg) {
         SMqConsumerEp *pCEp = taosArrayPop(pSub->unassignedVg);
         pCEp->consumerId = consumerId;
         taosArrayPush(pSub->assigned, pCEp);
-        pSub->nextConsumerIdx++;
+        pSub->nextConsumerIdx = (pSub->nextConsumerIdx+1) % taosArrayGetSize(pSub->availConsumer);
 
         // build msg
         SMqSetCVgReq req = {
diff --git a/source/dnode/vnode/inc/tq.h b/source/dnode/vnode/inc/tq.h
index 1a41a02673..eb82d19a4f 100644
--- a/source/dnode/vnode/inc/tq.h
+++ b/source/dnode/vnode/inc/tq.h
@@ -27,6 +27,7 @@
 #include "trpc.h"
 #include "ttimer.h"
 #include "tutil.h"
+#include "wal.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -161,7 +162,8 @@ typedef struct STqGroup {
 } STqGroup;
 
 typedef struct STqTaskItem {
-  int32_t       status;
+  int8_t       status;
+  int64_t       offset;
   void*         dst;
   SSubQueryMsg* pMsg;
 } STqTaskItem;
@@ -183,6 +185,7 @@ typedef struct STqClientHandle {
   int64_t   committedOffset;
   int64_t   currentOffset;
   STqBuffer buffer;
+  SWalReadHandle* pReadhandle;
 } STqClientHandle;
 
 typedef struct STqQueryMsg {
@@ -321,25 +324,20 @@ void tqClose(STQ*);
 // void* will be replace by a msg type
 int tqPushMsg(STQ*, void* msg, int64_t version);
 int tqCommit(STQ*);
-int tqConsume(STQ*, SRpcMsg* pReq, SRpcMsg** pRsp);
 
+#if 0
+int tqConsume(STQ*, SRpcMsg* pReq, SRpcMsg** pRsp);
 int tqSetCursor(STQ*, STqSetCurReq* pMsg);
 int tqBufferSetOffset(STqTopic*, int64_t offset);
-
 STqTopic* tqFindTopic(STqGroup*, int64_t topicId);
-
 STqGroup* tqGetGroup(STQ*, int64_t clientId);
-
 STqGroup* tqOpenGroup(STQ*, int64_t topicId, int64_t cgId, int64_t cId);
 int       tqCloseGroup(STQ*, int64_t topicId, int64_t cgId, int64_t cId);
 int       tqRegisterContext(STqGroup*, void* ahandle);
 int       tqSendLaunchQuery(STqMsgItem*, int64_t offset);
+#endif
 
-int tqSerializeGroup(const STqGroup*, STqSerializedHead**);
-
-const void* tqDeserializeGroup(const STqSerializedHead*, STqGroup**);
-
-static int tqQueryExecuting(int32_t status) { return status; }
+int32_t tqProcessConsume(STQ* pTq, SRpcMsg *pMsg, SRpcMsg **ppRsp);
 
 typedef struct STqReadHandle {
   int64_t        ver;
@@ -350,9 +348,6 @@ typedef struct STqReadHandle {
   SMeta*         pMeta;
 } STqReadHandle;
 
-typedef struct SSubmitBlkScanInfo {
-} SSubmitBlkScanInfo;
-
 STqReadHandle* tqInitSubmitMsgScanner(SMeta* pMeta, SSubmitMsg* pMsg);
 bool           tqNextDataBlock(STqReadHandle* pHandle);
 int            tqRetrieveDataBlockInfo(STqReadHandle* pHandle, SDataBlockInfo* pBlockInfo);
diff --git a/source/dnode/vnode/src/inc/tqInt.h b/source/dnode/vnode/src/inc/tqInt.h
index 107f5d5103..b4e1f57384 100644
--- a/source/dnode/vnode/src/inc/tqInt.h
+++ b/source/dnode/vnode/src/inc/tqInt.h
@@ -43,6 +43,9 @@ extern int32_t tqDebugFlag;
 // delete persistent storage for meta info
 // int tqDropTCGroup(STQ*, const char* topic, int cgId);
 
+int tqSerializeGroup(const STqGroup*, STqSerializedHead**);
+const void* tqDeserializeGroup(const STqSerializedHead* pHead, STqGroup** ppGroup);
+static int FORCE_INLINE tqQueryExecuting(int32_t status) { return status; }
 #ifdef __cplusplus
 }
 #endif
diff --git a/source/dnode/vnode/src/tq/tq.c b/source/dnode/vnode/src/tq/tq.c
index a5be0ec29a..b83cfe99bc 100644
--- a/source/dnode/vnode/src/tq/tq.c
+++ b/source/dnode/vnode/src/tq/tq.c
@@ -608,6 +608,40 @@ int tqItemSSize() {
   return 0;
 }
 
+int32_t tqProcessConsume(STQ* pTq, SRpcMsg* pMsg, SRpcMsg **ppRsp) {
+  SMqCVConsumeReq* pReq = pMsg->pCont;
+  int64_t reqId = pReq->reqId;
+  int64_t clientId = pReq->clientId;
+  int64_t offset = pReq->offset;
+  int64_t blockingTime = pReq->blockingTime;
+
+  STqClientHandle* pHandle = tqHandleGet(pTq->tqMeta, clientId);
+  int8_t pos = offset % TQ_BUFFER_SIZE;
+  int8_t old = atomic_val_compare_exchange_8(&pHandle->buffer.output[pos].status, 0, 1);
+  if (old == 1) {
+    // do nothing
+  }
+  if (walReadWithHandle(pHandle->pReadhandle, offset) < 0) {
+    //TODO
+  }
+  SWalHead *pHead = pHandle->pReadhandle->pHead;
+  while (pHead->head.msgType != TDMT_VND_SUBMIT) {
+    // read until find TDMT_VND_SUBMIT
+  }
+  SSubmitMsg *pCont = (SSubmitMsg*)&pHead->head.body;
+
+  SSubQueryMsg* pQueryMsg = pHandle->buffer.output[pos].pMsg;
+
+  void* outputData;
+
+  atomic_store_8(&pHandle->buffer.output[pos].status, 1);
+  // launch query
+  // get result
+  // put into 
+  SMqCvConsumeRsp* pRsp;
+  return 0;
+}
+
 STqReadHandle* tqInitSubmitMsgScanner(SMeta* pMeta, SSubmitMsg *pMsg) {
   STqReadHandle* pReadHandle = malloc(sizeof(STqReadHandle));
   if (pReadHandle == NULL) {
diff --git a/source/dnode/vnode/src/vnd/vnodeQuery.c b/source/dnode/vnode/src/vnd/vnodeQuery.c
index 729d64f8b3..96791488fa 100644
--- a/source/dnode/vnode/src/vnd/vnodeQuery.c
+++ b/source/dnode/vnode/src/vnd/vnodeQuery.c
@@ -58,7 +58,7 @@ int vnodeProcessFetchReq(SVnode *pVnode, SRpcMsg *pMsg, SRpcMsg **pRsp) {
     case TDMT_VND_TABLE_META:
       return vnodeGetTableMeta(pVnode, pMsg, pRsp);
     case TDMT_VND_CONSUME:
-      return 0;
+      return tqProcessConsume(pVnode->pTq, pMsg, pRsp);
     default:
       vError("unknown msg type:%d in fetch queue", pMsg->msgType);
       return TSDB_CODE_VND_APP_ERROR;
diff --git a/source/dnode/vnode/src/vnd/vnodeWrite.c b/source/dnode/vnode/src/vnd/vnodeWrite.c
index 2f3a4d5409..deb8a714a6 100644
--- a/source/dnode/vnode/src/vnd/vnodeWrite.c
+++ b/source/dnode/vnode/src/vnd/vnodeWrite.c
@@ -110,6 +110,7 @@ int vnodeApplyWMsg(SVnode *pVnode, SRpcMsg *pMsg, SRpcMsg **pRsp) {
       }
       break;
     case TDMT_VND_MQ_SET_CONN: {
+      //TODO: wrap in a function
       char* reqStr = ptr;
       SMqSetCVgReq req;
       tDecodeSMqSetCVgReq(reqStr, &req);