diff --git a/example/src/tmq.c b/example/src/tmq.c
index ac7098b254652b9486bf5bd49ff5fe922f943f02..26e5ea82c19a3f0ac90689a4b4f1362caa193ec6 100644
--- a/example/src/tmq.c
+++ b/example/src/tmq.c
@@ -28,7 +28,7 @@ int32_t init_env() {
     return -1;
   }
 
-  TAOS_RES* pRes = taos_query(pConn, "create database if not exists abc1 vgroups 2");
+  TAOS_RES* pRes = taos_query(pConn, "create database if not exists abc1 vgroups 1");
   if (taos_errno(pRes) != 0) {
     printf("error in create db, reason:%s\n", taos_errstr(pRes));
     return -1;
@@ -62,6 +62,23 @@ int32_t init_env() {
     return -1;
   }
   taos_free_result(pRes);
+  return 0;
+}
+
+int32_t create_topic() {
+  printf("create topic");
+  TAOS_RES* pRes;
+  TAOS*     pConn = taos_connect("localhost", "root", "taosdata", NULL, 0);
+  if (pConn == NULL) {
+    return -1;
+  }
+
+  pRes = taos_query(pConn, "use abc1");
+  if (taos_errno(pRes) != 0) {
+    printf("error in use db, reason:%s\n", taos_errstr(pRes));
+    return -1;
+  }
+  taos_free_result(pRes);
 
   const char* sql = "select * from tu1";
   pRes = tmq_create_topic(pConn, "test_stb_topic_1", sql, strlen(sql));
@@ -193,6 +210,7 @@ int main(int argc, char* argv[]) {
     printf("env init\n");
     code = init_env();
   }
+  create_topic();
   tmq_t*      tmq = build_consumer();
   tmq_list_t* topic_list = build_topic_list();
   /*perf_loop(tmq, topic_list);*/
diff --git a/include/common/tmsg.h b/include/common/tmsg.h
index b42730d851f077b1bb30136ae10361f88b199fdf..5164fb6ccd2323764ac3aec259559ee572fbde4f 100644
--- a/include/common/tmsg.h
+++ b/include/common/tmsg.h
@@ -745,6 +745,7 @@ typedef struct {
   int8_t   cacheLastRow;
   int8_t   replica;
   int8_t   selfIndex;
+  int8_t   streamMode;
   SReplica replicas[TSDB_MAX_REPLICA];
 } SCreateVnodeReq, SAlterVnodeReq;
 
diff --git a/source/common/src/tmsg.c b/source/common/src/tmsg.c
index 314aa036fbe192728cb1f1d0ff6b3b17d4644e11..ac46c0c48c4d0b2169029833936c1313cf2d361d 100644
--- a/source/common/src/tmsg.c
+++ b/source/common/src/tmsg.c
@@ -45,6 +45,8 @@ int32_t tInitSubmitMsgIter(SSubmitReq *pMsg, SSubmitMsgIter *pIter) {
 }
 
 int32_t tGetSubmitMsgNext(SSubmitMsgIter *pIter, SSubmitBlk **pPBlock) {
+  ASSERT(pIter->len >= 0);
+
   if (pIter->len == 0) {
     pIter->len += sizeof(SSubmitReq);
   } else {
@@ -2109,6 +2111,7 @@ int32_t tSerializeSCreateVnodeReq(void *buf, int32_t bufLen, SCreateVnodeReq *pR
   if (tEncodeI8(&encoder, pReq->cacheLastRow) < 0) return -1;
   if (tEncodeI8(&encoder, pReq->replica) < 0) return -1;
   if (tEncodeI8(&encoder, pReq->selfIndex) < 0) return -1;
+  if (tEncodeI8(&encoder, pReq->streamMode) < 0) return -1;
   for (int32_t i = 0; i < TSDB_MAX_REPLICA; ++i) {
     SReplica *pReplica = &pReq->replicas[i];
     if (tEncodeSReplica(&encoder, pReplica) < 0) return -1;
@@ -2148,6 +2151,7 @@ int32_t tDeserializeSCreateVnodeReq(void *buf, int32_t bufLen, SCreateVnodeReq *
   if (tDecodeI8(&decoder, &pReq->cacheLastRow) < 0) return -1;
   if (tDecodeI8(&decoder, &pReq->replica) < 0) return -1;
   if (tDecodeI8(&decoder, &pReq->selfIndex) < 0) return -1;
+  if (tDecodeI8(&decoder, &pReq->streamMode) < 0) return -1;
   for (int32_t i = 0; i < TSDB_MAX_REPLICA; ++i) {
     SReplica *pReplica = &pReq->replicas[i];
     if (tDecodeSReplica(&decoder, pReplica) < 0) return -1;
diff --git a/source/dnode/mgmt/impl/src/dndVnodes.c b/source/dnode/mgmt/impl/src/dndVnodes.c
index ebb2d1b4f0e4b9d63ae862bfa47b755bb3dcb9f9..b82d991179a8b698b4be348a8f51ff164cb5e2d6 100644
--- a/source/dnode/mgmt/impl/src/dndVnodes.c
+++ b/source/dnode/mgmt/impl/src/dndVnodes.c
@@ -507,6 +507,7 @@ static void dndGenerateVnodeCfg(SCreateVnodeReq *pCreate, SVnodeCfg *pCfg) {
   pCfg->isHeapAllocator = true;
   pCfg->ttl = 4;
   pCfg->keep = pCreate->daysToKeep0;
+  pCfg->streamMode = pCreate->streamMode;
   pCfg->isWeak = true;
   pCfg->tsdbCfg.keep = pCreate->daysToKeep0;
   pCfg->tsdbCfg.keep1 = pCreate->daysToKeep2;
diff --git a/source/dnode/mnode/impl/inc/mndDef.h b/source/dnode/mnode/impl/inc/mndDef.h
index 20c72d118ba282322d4336dd5ca134ea16e2061b..e64191f7153c87301fa14d74e44cdb75b5f2cd89 100644
--- a/source/dnode/mnode/impl/inc/mndDef.h
+++ b/source/dnode/mnode/impl/inc/mndDef.h
@@ -337,6 +337,7 @@ typedef struct {
   int64_t   pointsWritten;
   int8_t    compact;
   int8_t    replica;
+  int8_t    streamMode;
   SVnodeGid vnodeGid[TSDB_MAX_REPLICA];
 } SVgObj;
 
diff --git a/source/dnode/mnode/impl/src/mndDb.c b/source/dnode/mnode/impl/src/mndDb.c
index 122982b7f26176e793746b8a6c803845efd28d85..9c8a4ce586fc81db61759df6819435f1c9911680 100644
--- a/source/dnode/mnode/impl/src/mndDb.c
+++ b/source/dnode/mnode/impl/src/mndDb.c
@@ -395,24 +395,27 @@ static int32_t mndCreateDb(SMnode *pMnode, SMnodeMsg *pReq, SCreateDbReq *pCreat
   dbObj.vgVersion = 1;
   dbObj.hashMethod = 1;
   memcpy(dbObj.createUser, pUser->user, TSDB_USER_LEN);
-  dbObj.cfg = (SDbCfg){.numOfVgroups = pCreate->numOfVgroups,
-                       .cacheBlockSize = pCreate->cacheBlockSize,
-                       .totalBlocks = pCreate->totalBlocks,
-                       .daysPerFile = pCreate->daysPerFile,
-                       .daysToKeep0 = pCreate->daysToKeep0,
-                       .daysToKeep1 = pCreate->daysToKeep1,
-                       .daysToKeep2 = pCreate->daysToKeep2,
-                       .minRows = pCreate->minRows,
-                       .maxRows = pCreate->maxRows,
-                       .fsyncPeriod = pCreate->fsyncPeriod,
-                       .commitTime = pCreate->commitTime,
-                       .precision = pCreate->precision,
-                       .compression = pCreate->compression,
-                       .walLevel = pCreate->walLevel,
-                       .replications = pCreate->replications,
-                       .quorum = pCreate->quorum,
-                       .update = pCreate->update,
-                       .cacheLastRow = pCreate->cacheLastRow};
+  dbObj.cfg = (SDbCfg){
+      .numOfVgroups = pCreate->numOfVgroups,
+      .cacheBlockSize = pCreate->cacheBlockSize,
+      .totalBlocks = pCreate->totalBlocks,
+      .daysPerFile = pCreate->daysPerFile,
+      .daysToKeep0 = pCreate->daysToKeep0,
+      .daysToKeep1 = pCreate->daysToKeep1,
+      .daysToKeep2 = pCreate->daysToKeep2,
+      .minRows = pCreate->minRows,
+      .maxRows = pCreate->maxRows,
+      .fsyncPeriod = pCreate->fsyncPeriod,
+      .commitTime = pCreate->commitTime,
+      .precision = pCreate->precision,
+      .compression = pCreate->compression,
+      .walLevel = pCreate->walLevel,
+      .replications = pCreate->replications,
+      .quorum = pCreate->quorum,
+      .update = pCreate->update,
+      .cacheLastRow = pCreate->cacheLastRow,
+      .streamMode = pCreate->streamMode,
+  };
 
   mndSetDefaultDbCfg(&dbObj.cfg);
 
@@ -1400,4 +1403,4 @@ static int32_t mndRetrieveDbs(SMnodeMsg *pReq, SShowObj *pShow, char *data, int3
 static void mndCancelGetNextDb(SMnode *pMnode, void *pIter) {
   SSdb *pSdb = pMnode->pSdb;
   sdbCancelFetch(pSdb, pIter);
-}
\ No newline at end of file
+}
diff --git a/source/dnode/mnode/impl/src/mndSubscribe.c b/source/dnode/mnode/impl/src/mndSubscribe.c
index 9dba166b95e360c6c8f1be18b47f67e03874f4cf..a5c4c41244e32d79d99b6072601267f4e923e4bb 100644
--- a/source/dnode/mnode/impl/src/mndSubscribe.c
+++ b/source/dnode/mnode/impl/src/mndSubscribe.c
@@ -1099,6 +1099,8 @@ static int32_t mndProcessSubscribeReq(SMnodeMsg *pMsg) {
         pConsumerEp->consumerId = consumerId;
         taosArrayPush(mqSubConsumer.vgInfo, pConsumerEp);
         if (pConsumerEp->oldConsumerId == -1) {
+          mInfo("mq set conn: assign vgroup %d of topic %s to consumer %ld", pConsumerEp->vgId, newTopicName,
+                pConsumerEp->consumerId);
           mndPersistMqSetConnReq(pMnode, pTrans, pTopic, cgroup, pConsumerEp);
         } else {
           mndPersistRebalanceMsg(pMnode, pTrans, pConsumerEp);
diff --git a/source/dnode/mnode/impl/src/mndVgroup.c b/source/dnode/mnode/impl/src/mndVgroup.c
index a2438a3b8ee0d3167e95f7e771b7ff16dc719ffb..b437b444177d5594c2c637b2741fe367b0305674 100644
--- a/source/dnode/mnode/impl/src/mndVgroup.c
+++ b/source/dnode/mnode/impl/src/mndVgroup.c
@@ -21,7 +21,7 @@
 #include "mndShow.h"
 #include "mndTrans.h"
 
-#define TSDB_VGROUP_VER_NUMBER 1
+#define TSDB_VGROUP_VER_NUMBER   1
 #define TSDB_VGROUP_RESERVE_SIZE 64
 
 static SSdbRow *mndVgroupActionDecode(SSdbRaw *pRaw);
@@ -214,6 +214,7 @@ void *mndBuildCreateVnodeReq(SMnode *pMnode, SDnodeObj *pDnode, SDbObj *pDb, SVg
   createReq.cacheLastRow = pDb->cfg.cacheLastRow;
   createReq.replica = pVgroup->replica;
   createReq.selfIndex = -1;
+  createReq.streamMode = pVgroup->streamMode;
 
   for (int32_t v = 0; v < pVgroup->replica; ++v) {
     SReplica  *pReplica = &createReq.replicas[v];
@@ -255,8 +256,7 @@ void *mndBuildCreateVnodeReq(SMnode *pMnode, SDnodeObj *pDnode, SDbObj *pDb, SVg
   return pReq;
 }
 
-void *mndBuildDropVnodeReq(SMnode *pMnode, SDnodeObj *pDnode, SDbObj *pDb, SVgObj *pVgroup,
-                                    int32_t *pContLen) {
+void *mndBuildDropVnodeReq(SMnode *pMnode, SDnodeObj *pDnode, SDbObj *pDb, SVgObj *pVgroup, int32_t *pContLen) {
   SDropVnodeReq dropReq = {0};
   dropReq.dnodeId = pDnode->id;
   dropReq.vgId = pVgroup->vgId;
@@ -399,6 +399,7 @@ int32_t mndAllocVgroup(SMnode *pMnode, SDbObj *pDb, SVgObj **ppVgroups) {
     pVgroup->createdTime = taosGetTimestampMs();
     pVgroup->updateTime = pVgroups->createdTime;
     pVgroup->version = 1;
+    pVgroup->streamMode = pDb->cfg.streamMode;
     pVgroup->hashBegin = hashMin + hashInterval * v;
     if (v == pDb->cfg.numOfVgroups - 1) {
       pVgroup->hashEnd = hashMax;
@@ -700,4 +701,4 @@ static int32_t mndRetrieveVnodes(SMnodeMsg *pReq, SShowObj *pShow, char *data, i
 static void mndCancelGetNextVnode(SMnode *pMnode, void *pIter) {
   SSdb *pSdb = pMnode->pSdb;
   sdbCancelFetch(pSdb, pIter);
-}
\ No newline at end of file
+}
diff --git a/source/dnode/vnode/inc/vnode.h b/source/dnode/vnode/inc/vnode.h
index eaf30da1bb8bcc3a47e828988c0a977587a2ea1e..1fb0b05f9e10e837ad6a79cfe4a23d06c1d15914 100644
--- a/source/dnode/vnode/inc/vnode.h
+++ b/source/dnode/vnode/inc/vnode.h
@@ -51,6 +51,7 @@ typedef struct {
   bool     isHeapAllocator;
   uint32_t ttl;
   uint32_t keep;
+  int8_t   streamMode;
   bool     isWeak;
   STsdbCfg tsdbCfg;
   SMetaCfg metaCfg;
diff --git a/source/dnode/vnode/src/vnd/vnodeWrite.c b/source/dnode/vnode/src/vnd/vnodeWrite.c
index 5c39c65f9ff12d25c881213ac4ac53e29c6dda45..ade280eecc85f9346331bf5a91a79c8afbdf1198 100644
--- a/source/dnode/vnode/src/vnd/vnodeWrite.c
+++ b/source/dnode/vnode/src/vnd/vnodeWrite.c
@@ -43,13 +43,17 @@ int vnodeProcessWMsgs(SVnode *pVnode, SArray *pMsgs) {
 int vnodeApplyWMsg(SVnode *pVnode, SRpcMsg *pMsg, SRpcMsg **pRsp) {
   SVCreateTbReq      vCreateTbReq;
   SVCreateTbBatchReq vCreateTbBatchReq;
-  void              *ptr = vnodeMalloc(pVnode, pMsg->contLen);
-  if (ptr == NULL) {
-    // TODO: handle error
-  }
+  void              *ptr = NULL;
 
-  // TODO: copy here need to be extended
-  memcpy(ptr, pMsg->pCont, pMsg->contLen);
+  if (pVnode->config.streamMode == 0) {
+    ptr = vnodeMalloc(pVnode, pMsg->contLen);
+    if (ptr == NULL) {
+      // TODO: handle error
+    }
+
+    // TODO: copy here need to be extended
+    memcpy(ptr, pMsg->pCont, pMsg->contLen);
+  }
 
   // todo: change the interface here
   int64_t ver;
@@ -109,17 +113,19 @@ int vnodeApplyWMsg(SVnode *pVnode, SRpcMsg *pMsg, SRpcMsg **pRsp) {
       // }
       break;
     case TDMT_VND_SUBMIT:
-      if (tsdbInsertData(pVnode->pTsdb, (SSubmitReq *)ptr, NULL) < 0) {
-        // TODO: handle error
+      if (pVnode->config.streamMode == 0) {
+        if (tsdbInsertData(pVnode->pTsdb, (SSubmitReq *)ptr, NULL) < 0) {
+          // TODO: handle error
+        }
       }
       break;
     case TDMT_VND_MQ_SET_CONN: {
-      if (tqProcessSetConnReq(pVnode->pTq, POINTER_SHIFT(ptr, sizeof(SMsgHead))) < 0) {
+      if (tqProcessSetConnReq(pVnode->pTq, POINTER_SHIFT(pMsg->pCont, sizeof(SMsgHead))) < 0) {
         // TODO: handle error
       }
     } break;
     case TDMT_VND_MQ_REB: {
-      if (tqProcessRebReq(pVnode->pTq, POINTER_SHIFT(ptr, sizeof(SMsgHead))) < 0) {
+      if (tqProcessRebReq(pVnode->pTq, POINTER_SHIFT(pMsg->pCont, sizeof(SMsgHead))) < 0) {
       }
     } break;
     default: