diff --git a/include/libs/monitor/monitor.h b/include/libs/monitor/monitor.h
index 12e465e0f8..3dee59ab14 100644
--- a/include/libs/monitor/monitor.h
+++ b/include/libs/monitor/monitor.h
@@ -161,10 +161,6 @@ typedef struct {
   SMonLogs        log;
 } SMonMmInfo;
 
-int32_t tSerializeSMonMmInfo(void *buf, int32_t bufLen, SMonMmInfo *pInfo);
-int32_t tDeserializeSMonMmInfo(void *buf, int32_t bufLen, SMonMmInfo *pInfo);
-void    tFreeSMonMmInfo(SMonMmInfo *pInfo);
-
 typedef struct {
   SArray *datadirs;  // array of SMonDiskDesc
 } SMonDiskInfo;
@@ -176,56 +172,31 @@ typedef struct {
   SMonLogs     log;
 } SMonVmInfo;
 
-int32_t tSerializeSMonVmInfo(void *buf, int32_t bufLen, SMonVmInfo *pInfo);
-int32_t tDeserializeSMonVmInfo(void *buf, int32_t bufLen, SMonVmInfo *pInfo);
-void    tFreeSMonVmInfo(SMonVmInfo *pInfo);
-
 typedef struct {
   SMonSysInfo sys;
   SMonLogs    log;
   SQnodeLoad  load;
 } SMonQmInfo;
 
-int32_t tSerializeSMonQmInfo(void *buf, int32_t bufLen, SMonQmInfo *pInfo);
-int32_t tDeserializeSMonQmInfo(void *buf, int32_t bufLen, SMonQmInfo *pInfo);
-void    tFreeSMonQmInfo(SMonQmInfo *pInfo);
-
 typedef struct {
   SMonSysInfo sys;
   SMonLogs    log;
 } SMonSmInfo;
 
-int32_t tSerializeSMonSmInfo(void *buf, int32_t bufLen, SMonSmInfo *pInfo);
-int32_t tDeserializeSMonSmInfo(void *buf, int32_t bufLen, SMonSmInfo *pInfo);
-void    tFreeSMonSmInfo(SMonSmInfo *pInfo);
 typedef struct {
   SMonSysInfo sys;
   SMonLogs    log;
 } SMonBmInfo;
 
-int32_t tSerializeSMonBmInfo(void *buf, int32_t bufLen, SMonBmInfo *pInfo);
-int32_t tDeserializeSMonBmInfo(void *buf, int32_t bufLen, SMonBmInfo *pInfo);
-void    tFreeSMonBmInfo(SMonBmInfo *pInfo);
-
 typedef struct {
   SArray *pVloads;  // SVnodeLoad
 } SMonVloadInfo;
 
-int32_t tSerializeSMonVloadInfo(void *buf, int32_t bufLen, SMonVloadInfo *pInfo);
-int32_t tDeserializeSMonVloadInfo(void *buf, int32_t bufLen, SMonVloadInfo *pInfo);
-void    tFreeSMonVloadInfo(SMonVloadInfo *pInfo);
-
 typedef struct {
   int8_t     isMnode;
   SMnodeLoad load;
 } SMonMloadInfo;
 
-int32_t tSerializeSMonMloadInfo(void *buf, int32_t bufLen, SMonMloadInfo *pInfo);
-int32_t tDeserializeSMonMloadInfo(void *buf, int32_t bufLen, SMonMloadInfo *pInfo);
-
-int32_t tSerializeSQnodeLoad(void *buf, int32_t bufLen, SQnodeLoad *pInfo);
-int32_t tDeserializeSQnodeLoad(void *buf, int32_t bufLen, SQnodeLoad *pInfo);
-
 typedef struct {
   const char *server;
   uint16_t    port;
@@ -245,6 +216,12 @@ void    monSetSmInfo(SMonSmInfo *pInfo);
 void    monSetBmInfo(SMonBmInfo *pInfo);
 void    monSendReport();
 
+void tFreeSMonMmInfo(SMonMmInfo *pInfo);
+void tFreeSMonVmInfo(SMonVmInfo *pInfo);
+void tFreeSMonQmInfo(SMonQmInfo *pInfo);
+void tFreeSMonSmInfo(SMonSmInfo *pInfo);
+void tFreeSMonBmInfo(SMonBmInfo *pInfo);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/source/libs/monitor/src/monMain.c b/source/libs/monitor/src/monMain.c
index 890a59e4be..70792ee611 100644
--- a/source/libs/monitor/src/monMain.c
+++ b/source/libs/monitor/src/monMain.c
@@ -450,17 +450,10 @@ static void monGenDiskJson(SMonInfo *pMonitor) {
 }
 
 static const char *monLogLevelStr(ELogLevel level) {
-  switch (level) {
-    case DEBUG_ERROR:
-      return "error";
-    case DEBUG_INFO:
-      return "info";
-    case DEBUG_DEBUG:
-      return "debug";
-    case DEBUG_TRACE:
-      return "trace";
-    default:
-      return "undefine";
+  if (level == DEBUG_ERROR) {
+    return "error";
+  } else {
+    return "info";
   }
 }
 
diff --git a/source/libs/monitor/src/monMsg.c b/source/libs/monitor/src/monMsg.c
index dd371f874c..c20055067e 100644
--- a/source/libs/monitor/src/monMsg.c
+++ b/source/libs/monitor/src/monMsg.c
@@ -18,272 +18,6 @@
 #include "tcoding.h"
 #include "tencode.h"
 
-static int32_t tEncodeSMonSysInfo(SEncoder *encoder, const SMonSysInfo *pInfo) {
-  if (tEncodeDouble(encoder, pInfo->cpu_engine) < 0) return -1;
-  if (tEncodeDouble(encoder, pInfo->cpu_system) < 0) return -1;
-  if (tEncodeFloat(encoder, pInfo->cpu_cores) < 0) return -1;
-  if (tEncodeI64(encoder, pInfo->mem_engine) < 0) return -1;
-  if (tEncodeI64(encoder, pInfo->mem_system) < 0) return -1;
-  if (tEncodeI64(encoder, pInfo->mem_total) < 0) return -1;
-  if (tEncodeI64(encoder, pInfo->disk_engine) < 0) return -1;
-  if (tEncodeI64(encoder, pInfo->disk_used) < 0) return -1;
-  if (tEncodeI64(encoder, pInfo->disk_total) < 0) return -1;
-  if (tEncodeI64(encoder, pInfo->net_in) < 0) return -1;
-  if (tEncodeI64(encoder, pInfo->net_out) < 0) return -1;
-  if (tEncodeI64(encoder, pInfo->io_read) < 0) return -1;
-  if (tEncodeI64(encoder, pInfo->io_write) < 0) return -1;
-  if (tEncodeI64(encoder, pInfo->io_read_disk) < 0) return -1;
-  if (tEncodeI64(encoder, pInfo->io_write_disk) < 0) return -1;
-  return 0;
-}
-
-static int32_t tDecodeSMonSysInfo(SDecoder *decoder, SMonSysInfo *pInfo) {
-  if (tDecodeDouble(decoder, &pInfo->cpu_engine) < 0) return -1;
-  if (tDecodeDouble(decoder, &pInfo->cpu_system) < 0) return -1;
-  if (tDecodeFloat(decoder, &pInfo->cpu_cores) < 0) return -1;
-  if (tDecodeI64(decoder, &pInfo->mem_engine) < 0) return -1;
-  if (tDecodeI64(decoder, &pInfo->mem_system) < 0) return -1;
-  if (tDecodeI64(decoder, &pInfo->mem_total) < 0) return -1;
-  if (tDecodeI64(decoder, &pInfo->disk_engine) < 0) return -1;
-  if (tDecodeI64(decoder, &pInfo->disk_used) < 0) return -1;
-  if (tDecodeI64(decoder, &pInfo->disk_total) < 0) return -1;
-  if (tDecodeI64(decoder, &pInfo->net_in) < 0) return -1;
-  if (tDecodeI64(decoder, &pInfo->net_out) < 0) return -1;
-  if (tDecodeI64(decoder, &pInfo->io_read) < 0) return -1;
-  if (tDecodeI64(decoder, &pInfo->io_write) < 0) return -1;
-  if (tDecodeI64(decoder, &pInfo->io_read_disk) < 0) return -1;
-  if (tDecodeI64(decoder, &pInfo->io_write_disk) < 0) return -1;
-  return 0;
-}
-
-int32_t tEncodeSMonLogs(SEncoder *encoder, const SMonLogs *pInfo) {
-  if (tEncodeI32(encoder, pInfo->numOfErrorLogs) < 0) return -1;
-  if (tEncodeI32(encoder, pInfo->numOfInfoLogs) < 0) return -1;
-  if (tEncodeI32(encoder, pInfo->numOfDebugLogs) < 0) return -1;
-  if (tEncodeI32(encoder, pInfo->numOfTraceLogs) < 0) return -1;
-  if (tEncodeI32(encoder, taosArrayGetSize(pInfo->logs)) < 0) return -1;
-  for (int32_t i = 0; i < taosArrayGetSize(pInfo->logs); ++i) {
-    SMonLogItem *pLog = taosArrayGet(pInfo->logs, i);
-    if (tEncodeI64(encoder, pLog->ts) < 0) return -1;
-    if (tEncodeI8(encoder, pLog->level) < 0) return -1;
-    if (tEncodeCStr(encoder, pLog->content) < 0) return -1;
-  }
-  return 0;
-}
-
-static int32_t tDecodeSMonLogs(SDecoder *decoder, SMonLogs *pInfo) {
-  if (tDecodeI32(decoder, &pInfo->numOfErrorLogs) < 0) return -1;
-  if (tDecodeI32(decoder, &pInfo->numOfInfoLogs) < 0) return -1;
-  if (tDecodeI32(decoder, &pInfo->numOfDebugLogs) < 0) return -1;
-  if (tDecodeI32(decoder, &pInfo->numOfTraceLogs) < 0) return -1;
-
-  int32_t arraySize = 0;
-  if (tDecodeI32(decoder, &arraySize) < 0) return -1;
-
-  pInfo->logs = taosArrayInit(arraySize, sizeof(SMonLogItem));
-  if (pInfo->logs == NULL) return -1;
-
-  for (int32_t i = 0; i < arraySize; ++i) {
-    SMonLogItem desc = {0};
-    if (tDecodeI64(decoder, &desc.ts) < 0) return -1;
-    int8_t level = 0;
-    if (tDecodeI8(decoder, &level) < 0) return -1;
-    desc.level = level;
-    if (tDecodeCStrTo(decoder, desc.content) < 0) return -1;
-    taosArrayPush(pInfo->logs, &desc);
-  }
-
-  return 0;
-}
-
-int32_t tEncodeSMonClusterInfo(SEncoder *encoder, const SMonClusterInfo *pInfo) {
-  if (tEncodeCStr(encoder, pInfo->first_ep) < 0) return -1;
-  if (tEncodeI32(encoder, pInfo->first_ep_dnode_id) < 0) return -1;
-  if (tEncodeCStr(encoder, pInfo->version) < 0) return -1;
-  if (tEncodeFloat(encoder, pInfo->master_uptime) < 0) return -1;
-  if (tEncodeI32(encoder, pInfo->monitor_interval) < 0) return -1;
-  if (tEncodeI32(encoder, pInfo->dbs_total) < 0) return -1;
-  if (tEncodeI32(encoder, pInfo->stbs_total) < 0) return -1;
-  if (tEncodeI64(encoder, pInfo->tbs_total) < 0) return -1;
-  if (tEncodeI32(encoder, pInfo->vgroups_total) < 0) return -1;
-  if (tEncodeI32(encoder, pInfo->vgroups_alive) < 0) return -1;
-  if (tEncodeI32(encoder, pInfo->vnodes_total) < 0) return -1;
-  if (tEncodeI32(encoder, pInfo->vnodes_alive) < 0) return -1;
-  if (tEncodeI32(encoder, pInfo->connections_total) < 0) return -1;
-  if (tEncodeI32(encoder, taosArrayGetSize(pInfo->dnodes)) < 0) return -1;
-  if (tEncodeI32(encoder, taosArrayGetSize(pInfo->mnodes)) < 0) return -1;
-  for (int32_t i = 0; i < taosArrayGetSize(pInfo->dnodes); ++i) {
-    SMonDnodeDesc *pDesc = taosArrayGet(pInfo->dnodes, i);
-    if (tEncodeI32(encoder, pDesc->dnode_id) < 0) return -1;
-    if (tEncodeCStr(encoder, pDesc->dnode_ep) < 0) return -1;
-    if (tEncodeCStr(encoder, pDesc->status) < 0) return -1;
-  }
-  for (int32_t i = 0; i < taosArrayGetSize(pInfo->mnodes); ++i) {
-    SMonMnodeDesc *pDesc = taosArrayGet(pInfo->mnodes, i);
-    if (tEncodeI32(encoder, pDesc->mnode_id) < 0) return -1;
-    if (tEncodeCStr(encoder, pDesc->mnode_ep) < 0) return -1;
-    if (tEncodeCStr(encoder, pDesc->role) < 0) return -1;
-  }
-  return 0;
-}
-
-int32_t tDecodeSMonClusterInfo(SDecoder *decoder, SMonClusterInfo *pInfo) {
-  if (tDecodeCStrTo(decoder, pInfo->first_ep) < 0) return -1;
-  if (tDecodeI32(decoder, &pInfo->first_ep_dnode_id) < 0) return -1;
-  if (tDecodeCStrTo(decoder, pInfo->version) < 0) return -1;
-  if (tDecodeFloat(decoder, &pInfo->master_uptime) < 0) return -1;
-  if (tDecodeI32(decoder, &pInfo->monitor_interval) < 0) return -1;
-  if (tDecodeI32(decoder, &pInfo->dbs_total) < 0) return -1;
-  if (tDecodeI32(decoder, &pInfo->stbs_total) < 0) return -1;
-  if (tDecodeI64(decoder, &pInfo->tbs_total) < 0) return -1;
-  if (tDecodeI32(decoder, &pInfo->vgroups_total) < 0) return -1;
-  if (tDecodeI32(decoder, &pInfo->vgroups_alive) < 0) return -1;
-  if (tDecodeI32(decoder, &pInfo->vnodes_total) < 0) return -1;
-  if (tDecodeI32(decoder, &pInfo->vnodes_alive) < 0) return -1;
-  if (tDecodeI32(decoder, &pInfo->connections_total) < 0) return -1;
-
-  int32_t dnodesSize = 0;
-  int32_t mnodesSize = 0;
-  if (tDecodeI32(decoder, &dnodesSize) < 0) return -1;
-  if (tDecodeI32(decoder, &mnodesSize) < 0) return -1;
-
-  pInfo->dnodes = taosArrayInit(dnodesSize, sizeof(SMonDnodeDesc));
-  pInfo->mnodes = taosArrayInit(mnodesSize, sizeof(SMonMnodeDesc));
-  if (pInfo->dnodes == NULL || pInfo->mnodes == NULL) return -1;
-
-  for (int32_t i = 0; i < dnodesSize; ++i) {
-    SMonDnodeDesc desc = {0};
-    if (tDecodeI32(decoder, &desc.dnode_id) < 0) return -1;
-    if (tDecodeCStrTo(decoder, desc.dnode_ep) < 0) return -1;
-    if (tDecodeCStrTo(decoder, desc.status) < 0) return -1;
-    taosArrayPush(pInfo->dnodes, &desc);
-  }
-
-  for (int32_t i = 0; i < mnodesSize; ++i) {
-    SMonMnodeDesc desc = {0};
-    if (tDecodeI32(decoder, &desc.mnode_id) < 0) return -1;
-    if (tDecodeCStrTo(decoder, desc.mnode_ep) < 0) return -1;
-    if (tDecodeCStrTo(decoder, desc.role) < 0) return -1;
-    taosArrayPush(pInfo->mnodes, &desc);
-  }
-  return 0;
-}
-
-int32_t tEncodeSMonVgroupInfo(SEncoder *encoder, const SMonVgroupInfo *pInfo) {
-  if (tEncodeI32(encoder, taosArrayGetSize(pInfo->vgroups)) < 0) return -1;
-  for (int32_t i = 0; i < taosArrayGetSize(pInfo->vgroups); ++i) {
-    SMonVgroupDesc *pDesc = taosArrayGet(pInfo->vgroups, i);
-    if (tEncodeI32(encoder, pDesc->vgroup_id) < 0) return -1;
-    if (tEncodeI32(encoder, pDesc->tables_num) < 0) return -1;
-    if (tEncodeCStr(encoder, pDesc->database_name) < 0) return -1;
-    if (tEncodeCStr(encoder, pDesc->status) < 0) return -1;
-    for (int32_t j = 0; j < TSDB_MAX_REPLICA; ++j) {
-      SMonVnodeDesc *pVDesc = &pDesc->vnodes[j];
-      if (tEncodeI32(encoder, pVDesc->dnode_id) < 0) return -1;
-      if (tEncodeCStr(encoder, pVDesc->vnode_role) < 0) return -1;
-    }
-  }
-  return 0;
-}
-
-int32_t tDecodeSMonVgroupInfo(SDecoder *decoder, SMonVgroupInfo *pInfo) {
-  int32_t arraySize = 0;
-  if (tDecodeI32(decoder, &arraySize) < 0) return -1;
-
-  pInfo->vgroups = taosArrayInit(arraySize, sizeof(SMonVgroupDesc));
-  if (pInfo->vgroups == NULL) return -1;
-
-  for (int32_t i = 0; i < arraySize; ++i) {
-    SMonVgroupDesc desc = {0};
-    if (tDecodeI32(decoder, &desc.vgroup_id) < 0) return -1;
-    if (tDecodeI32(decoder, &desc.tables_num) < 0) return -1;
-    if (tDecodeCStrTo(decoder, desc.database_name) < 0) return -1;
-    if (tDecodeCStrTo(decoder, desc.status) < 0) return -1;
-    for (int32_t j = 0; j < TSDB_MAX_REPLICA; ++j) {
-      SMonVnodeDesc *pVDesc = &desc.vnodes[j];
-      if (tDecodeI32(decoder, &pVDesc->dnode_id) < 0) return -1;
-      if (tDecodeCStrTo(decoder, pVDesc->vnode_role) < 0) return -1;
-    }
-    taosArrayPush(pInfo->vgroups, &desc);
-  }
-  return 0;
-}
-
-int32_t tEncodeSMonStbInfo(SEncoder *encoder, const SMonStbInfo *pInfo) {
-  if (tEncodeI32(encoder, taosArrayGetSize(pInfo->stbs)) < 0) return -1;
-  for (int32_t i = 0; i < taosArrayGetSize(pInfo->stbs); ++i) {
-    SMonStbDesc *pDesc = taosArrayGet(pInfo->stbs, i);
-    if (tEncodeCStr(encoder, pDesc->stb_name) < 0) return -1;
-    if (tEncodeCStr(encoder, pDesc->database_name) < 0) return -1;
-  }
-  return 0;
-}
-
-int32_t tDecodeSMonStbInfo(SDecoder *decoder, SMonStbInfo *pInfo) {
-  int32_t arraySize = 0;
-  if (tDecodeI32(decoder, &arraySize) < 0) return -1;
-
-  pInfo->stbs = taosArrayInit(arraySize, sizeof(SMonStbDesc));
-  if (pInfo->stbs == NULL) return -1;
-
-  for (int32_t i = 0; i < arraySize; ++i) {
-    SMonStbDesc desc = {0};
-    if (tDecodeCStrTo(decoder, desc.stb_name) < 0) return -1;
-    if (tDecodeCStrTo(decoder, desc.database_name) < 0) return -1;
-    taosArrayPush(pInfo->stbs, &desc);
-  }
-  return 0;
-}
-
-int32_t tEncodeSMonGrantInfo(SEncoder *encoder, const SMonGrantInfo *pInfo) {
-  if (tEncodeI32(encoder, pInfo->expire_time) < 0) return -1;
-  if (tEncodeI64(encoder, pInfo->timeseries_used) < 0) return -1;
-  if (tEncodeI64(encoder, pInfo->timeseries_total) < 0) return -1;
-  return 0;
-}
-
-int32_t tDecodeSMonGrantInfo(SDecoder *decoder, SMonGrantInfo *pInfo) {
-  if (tDecodeI32(decoder, &pInfo->expire_time) < 0) return -1;
-  if (tDecodeI64(decoder, &pInfo->timeseries_used) < 0) return -1;
-  if (tDecodeI64(decoder, &pInfo->timeseries_total) < 0) return -1;
-  return 0;
-}
-
-int32_t tSerializeSMonMmInfo(void *buf, int32_t bufLen, SMonMmInfo *pInfo) {
-  SEncoder encoder = {0};
-  tEncoderInit(&encoder, buf, bufLen);
-
-  if (tStartEncode(&encoder) < 0) return -1;
-  if (tEncodeSMonClusterInfo(&encoder, &pInfo->cluster) < 0) return -1;
-  if (tEncodeSMonVgroupInfo(&encoder, &pInfo->vgroup) < 0) return -1;
-  if (tEncodeSMonStbInfo(&encoder, &pInfo->stb) < 0) return -1;
-  if (tEncodeSMonGrantInfo(&encoder, &pInfo->grant) < 0) return -1;
-  if (tEncodeSMonSysInfo(&encoder, &pInfo->sys) < 0) return -1;
-  if (tEncodeSMonLogs(&encoder, &pInfo->log) < 0) return -1;
-  tEndEncode(&encoder);
-
-  int32_t tlen = encoder.pos;
-  tEncoderClear(&encoder);
-  return tlen;
-}
-
-int32_t tDeserializeSMonMmInfo(void *buf, int32_t bufLen, SMonMmInfo *pInfo) {
-  SDecoder decoder = {0};
-  tDecoderInit(&decoder, buf, bufLen);
-
-  if (tStartDecode(&decoder) < 0) return -1;
-  if (tDecodeSMonClusterInfo(&decoder, &pInfo->cluster) < 0) return -1;
-  if (tDecodeSMonVgroupInfo(&decoder, &pInfo->vgroup) < 0) return -1;
-  if (tDecodeSMonStbInfo(&decoder, &pInfo->stb) < 0) return -1;
-  if (tDecodeSMonGrantInfo(&decoder, &pInfo->grant) < 0) return -1;
-  if (tDecodeSMonSysInfo(&decoder, &pInfo->sys) < 0) return -1;
-  if (tDecodeSMonLogs(&decoder, &pInfo->log) < 0) return -1;
-  tEndDecode(&decoder);
-
-  tDecoderClear(&decoder);
-  return 0;
-}
-
 void tFreeSMonMmInfo(SMonMmInfo *pInfo) {
   taosArrayDestroy(pInfo->log.logs);
   taosArrayDestroy(pInfo->cluster.mnodes);
@@ -297,106 +31,6 @@ void tFreeSMonMmInfo(SMonMmInfo *pInfo) {
   pInfo->log.logs = NULL;
 }
 
-int32_t tEncodeSMonDiskDesc(SEncoder *encoder, const SMonDiskDesc *pDesc) {
-  if (tEncodeCStr(encoder, pDesc->name) < 0) return -1;
-  if (tEncodeI8(encoder, pDesc->level) < 0) return -1;
-  if (tEncodeI64(encoder, pDesc->size.total) < 0) return -1;
-  if (tEncodeI64(encoder, pDesc->size.used) < 0) return -1;
-  if (tEncodeI64(encoder, pDesc->size.avail) < 0) return -1;
-  return 0;
-}
-
-static int32_t tDecodeSMonDiskDesc(SDecoder *decoder, SMonDiskDesc *pDesc) {
-  if (tDecodeCStrTo(decoder, pDesc->name) < 0) return -1;
-  if (tDecodeI8(decoder, &pDesc->level) < 0) return -1;
-  if (tDecodeI64(decoder, &pDesc->size.total) < 0) return -1;
-  if (tDecodeI64(decoder, &pDesc->size.used) < 0) return -1;
-  if (tDecodeI64(decoder, &pDesc->size.avail) < 0) return -1;
-  return 0;
-}
-
-int32_t tEncodeSMonDiskInfo(SEncoder *encoder, const SMonDiskInfo *pInfo) {
-  if (tEncodeI32(encoder, taosArrayGetSize(pInfo->datadirs)) < 0) return -1;
-  for (int32_t i = 0; i < taosArrayGetSize(pInfo->datadirs); ++i) {
-    SMonDiskDesc *pDesc = taosArrayGet(pInfo->datadirs, i);
-    if (tEncodeSMonDiskDesc(encoder, pDesc) < 0) return -1;
-  }
-  return 0;
-}
-
-static int32_t tDecodeSMonDiskInfo(SDecoder *decoder, SMonDiskInfo *pInfo) {
-  int32_t arraySize = 0;
-  if (tDecodeI32(decoder, &arraySize) < 0) return -1;
-
-  pInfo->datadirs = taosArrayInit(arraySize, sizeof(SMonDiskDesc));
-  if (pInfo->datadirs == NULL) return -1;
-
-  for (int32_t i = 0; i < arraySize; ++i) {
-    SMonDiskDesc desc = {0};
-    if (tDecodeSMonDiskDesc(decoder, &desc) < 0) return -1;
-    taosArrayPush(pInfo->datadirs, &desc);
-  }
-
-  return 0;
-}
-
-int32_t tEncodeSVnodesStat(SEncoder *encoder, const SVnodesStat *pStat) {
-  if (tEncodeI32(encoder, pStat->openVnodes) < 0) return -1;
-  if (tEncodeI32(encoder, pStat->totalVnodes) < 0) return -1;
-  if (tEncodeI32(encoder, pStat->masterNum) < 0) return -1;
-  if (tEncodeI64(encoder, pStat->numOfSelectReqs) < 0) return -1;
-  if (tEncodeI64(encoder, pStat->numOfInsertReqs) < 0) return -1;
-  if (tEncodeI64(encoder, pStat->numOfInsertSuccessReqs) < 0) return -1;
-  if (tEncodeI64(encoder, pStat->numOfBatchInsertReqs) < 0) return -1;
-  if (tEncodeI64(encoder, pStat->numOfBatchInsertSuccessReqs) < 0) return -1;
-  if (tEncodeI64(encoder, pStat->errors) < 0) return -1;
-  return 0;
-}
-
-static int32_t tDecodeSVnodesStat(SDecoder *decoder, SVnodesStat *pStat) {
-  if (tDecodeI32(decoder, &pStat->openVnodes) < 0) return -1;
-  if (tDecodeI32(decoder, &pStat->totalVnodes) < 0) return -1;
-  if (tDecodeI32(decoder, &pStat->masterNum) < 0) return -1;
-  if (tDecodeI64(decoder, &pStat->numOfSelectReqs) < 0) return -1;
-  if (tDecodeI64(decoder, &pStat->numOfInsertReqs) < 0) return -1;
-  if (tDecodeI64(decoder, &pStat->numOfInsertSuccessReqs) < 0) return -1;
-  if (tDecodeI64(decoder, &pStat->numOfBatchInsertReqs) < 0) return -1;
-  if (tDecodeI64(decoder, &pStat->numOfBatchInsertSuccessReqs) < 0) return -1;
-  if (tDecodeI64(decoder, &pStat->errors) < 0) return -1;
-  return 0;
-}
-
-int32_t tSerializeSMonVmInfo(void *buf, int32_t bufLen, SMonVmInfo *pInfo) {
-  SEncoder encoder = {0};
-  tEncoderInit(&encoder, buf, bufLen);
-
-  if (tStartEncode(&encoder) < 0) return -1;
-  if (tEncodeSMonDiskInfo(&encoder, &pInfo->tfs) < 0) return -1;
-  if (tEncodeSVnodesStat(&encoder, &pInfo->vstat) < 0) return -1;
-  if (tEncodeSMonSysInfo(&encoder, &pInfo->sys) < 0) return -1;
-  if (tEncodeSMonLogs(&encoder, &pInfo->log) < 0) return -1;
-  tEndEncode(&encoder);
-
-  int32_t tlen = encoder.pos;
-  tEncoderClear(&encoder);
-  return tlen;
-}
-
-int32_t tDeserializeSMonVmInfo(void *buf, int32_t bufLen, SMonVmInfo *pInfo) {
-  SDecoder decoder = {0};
-  tDecoderInit(&decoder, buf, bufLen);
-
-  if (tStartDecode(&decoder) < 0) return -1;
-  if (tDecodeSMonDiskInfo(&decoder, &pInfo->tfs) < 0) return -1;
-  if (tDecodeSVnodesStat(&decoder, &pInfo->vstat) < 0) return -1;
-  if (tDecodeSMonSysInfo(&decoder, &pInfo->sys) < 0) return -1;
-  if (tDecodeSMonLogs(&decoder, &pInfo->log) < 0) return -1;
-  tEndDecode(&decoder);
-
-  tDecoderClear(&decoder);
-  return 0;
-}
-
 void tFreeSMonVmInfo(SMonVmInfo *pInfo) {
   taosArrayDestroy(pInfo->log.logs);
   taosArrayDestroy(pInfo->tfs.datadirs);
@@ -404,243 +38,17 @@ void tFreeSMonVmInfo(SMonVmInfo *pInfo) {
   pInfo->tfs.datadirs = NULL;
 }
 
-int32_t tSerializeSMonQmInfo(void *buf, int32_t bufLen, SMonQmInfo *pInfo) {
-  SEncoder encoder = {0};
-  tEncoderInit(&encoder, buf, bufLen);
-
-  if (tStartEncode(&encoder) < 0) return -1;
-  if (tEncodeSMonSysInfo(&encoder, &pInfo->sys) < 0) return -1;
-  if (tEncodeSMonLogs(&encoder, &pInfo->log) < 0) return -1;
-  tEndEncode(&encoder);
-
-  int32_t tlen = encoder.pos;
-  tEncoderClear(&encoder);
-  return tlen;
-}
-
-int32_t tDeserializeSMonQmInfo(void *buf, int32_t bufLen, SMonQmInfo *pInfo) {
-  SDecoder decoder = {0};
-  tDecoderInit(&decoder, buf, bufLen);
-
-  if (tStartDecode(&decoder) < 0) return -1;
-  if (tDecodeSMonSysInfo(&decoder, &pInfo->sys) < 0) return -1;
-  if (tDecodeSMonLogs(&decoder, &pInfo->log) < 0) return -1;
-  tEndDecode(&decoder);
-
-  tDecoderClear(&decoder);
-  return 0;
-}
-
 void tFreeSMonQmInfo(SMonQmInfo *pInfo) {
   taosArrayDestroy(pInfo->log.logs);
   pInfo->log.logs = NULL;
 }
 
-int32_t tSerializeSMonSmInfo(void *buf, int32_t bufLen, SMonSmInfo *pInfo) {
-  SEncoder encoder = {0};
-  tEncoderInit(&encoder, buf, bufLen);
-
-  if (tStartEncode(&encoder) < 0) return -1;
-  if (tEncodeSMonSysInfo(&encoder, &pInfo->sys) < 0) return -1;
-  if (tEncodeSMonLogs(&encoder, &pInfo->log) < 0) return -1;
-  tEndEncode(&encoder);
-
-  int32_t tlen = encoder.pos;
-  tEncoderClear(&encoder);
-  return tlen;
-}
-
-int32_t tDeserializeSMonSmInfo(void *buf, int32_t bufLen, SMonSmInfo *pInfo) {
-  SDecoder decoder = {0};
-  tDecoderInit(&decoder, buf, bufLen);
-
-  if (tStartDecode(&decoder) < 0) return -1;
-  if (tDecodeSMonSysInfo(&decoder, &pInfo->sys) < 0) return -1;
-  if (tDecodeSMonLogs(&decoder, &pInfo->log) < 0) return -1;
-  tEndDecode(&decoder);
-
-  tDecoderClear(&decoder);
-  return 0;
-}
-
 void tFreeSMonSmInfo(SMonSmInfo *pInfo) {
   taosArrayDestroy(pInfo->log.logs);
   pInfo->log.logs = NULL;
 }
 
-int32_t tSerializeSMonBmInfo(void *buf, int32_t bufLen, SMonBmInfo *pInfo) {
-  SEncoder encoder = {0};
-  tEncoderInit(&encoder, buf, bufLen);
-
-  if (tStartEncode(&encoder) < 0) return -1;
-  if (tEncodeSMonSysInfo(&encoder, &pInfo->sys) < 0) return -1;
-  if (tEncodeSMonLogs(&encoder, &pInfo->log) < 0) return -1;
-  tEndEncode(&encoder);
-
-  int32_t tlen = encoder.pos;
-  tEncoderClear(&encoder);
-  return tlen;
-}
-
-int32_t tDeserializeSMonBmInfo(void *buf, int32_t bufLen, SMonBmInfo *pInfo) {
-  SDecoder decoder = {0};
-  tDecoderInit(&decoder, buf, bufLen);
-
-  if (tStartDecode(&decoder) < 0) return -1;
-  if (tDecodeSMonSysInfo(&decoder, &pInfo->sys) < 0) return -1;
-  if (tDecodeSMonLogs(&decoder, &pInfo->log) < 0) return -1;
-  tEndDecode(&decoder);
-
-  tDecoderClear(&decoder);
-  return 0;
-}
-
 void tFreeSMonBmInfo(SMonBmInfo *pInfo) {
   taosArrayDestroy(pInfo->log.logs);
   pInfo->log.logs = NULL;
 }
-
-int32_t tSerializeSMonVloadInfo(void *buf, int32_t bufLen, SMonVloadInfo *pInfo) {
-  SEncoder encoder = {0};
-  tEncoderInit(&encoder, buf, bufLen);
-
-  if (tStartEncode(&encoder) < 0) return -1;
-  if (tEncodeI32(&encoder, taosArrayGetSize(pInfo->pVloads)) < 0) return -1;
-  for (int32_t i = 0; i < taosArrayGetSize(pInfo->pVloads); ++i) {
-    SVnodeLoad *pLoad = taosArrayGet(pInfo->pVloads, i);
-    if (tEncodeI32(&encoder, pLoad->vgId) < 0) return -1;
-    if (tEncodeI8(&encoder, pLoad->syncState) < 0) return -1;
-    if (tEncodeI8(&encoder, pLoad->syncRestore) < 0) return -1;
-    if (tEncodeI64(&encoder, pLoad->cacheUsage) < 0) return -1;
-    if (tEncodeI64(&encoder, pLoad->numOfTables) < 0) return -1;
-    if (tEncodeI64(&encoder, pLoad->numOfTimeSeries) < 0) return -1;
-    if (tEncodeI64(&encoder, pLoad->totalStorage) < 0) return -1;
-    if (tEncodeI64(&encoder, pLoad->compStorage) < 0) return -1;
-    if (tEncodeI64(&encoder, pLoad->pointsWritten) < 0) return -1;
-    if (tEncodeI64(&encoder, pLoad->numOfSelectReqs) < 0) return -1;
-    if (tEncodeI64(&encoder, pLoad->numOfInsertReqs) < 0) return -1;
-    if (tEncodeI64(&encoder, pLoad->numOfInsertSuccessReqs) < 0) return -1;
-    if (tEncodeI64(&encoder, pLoad->numOfBatchInsertReqs) < 0) return -1;
-    if (tEncodeI64(&encoder, pLoad->numOfBatchInsertSuccessReqs) < 0) return -1;
-  }
-  tEndEncode(&encoder);
-
-  int32_t tlen = encoder.pos;
-  tEncoderClear(&encoder);
-  return tlen;
-}
-
-int32_t tDeserializeSMonVloadInfo(void *buf, int32_t bufLen, SMonVloadInfo *pInfo) {
-  SDecoder decoder = {0};
-  tDecoderInit(&decoder, buf, bufLen);
-
-  if (tStartDecode(&decoder) < 0) return -1;
-
-  int32_t arraySize = 0;
-  if (tDecodeI32(&decoder, &arraySize) < 0) return -1;
-
-  pInfo->pVloads = taosArrayInit(arraySize, sizeof(SVnodeLoad));
-  if (pInfo->pVloads == NULL) return -1;
-
-  for (int32_t i = 0; i < arraySize; ++i) {
-    SVnodeLoad load = {0};
-    if (tDecodeI32(&decoder, &load.vgId) < 0) return -1;
-    if (tDecodeI8(&decoder, &load.syncState) < 0) return -1;
-    if (tDecodeI8(&decoder, &load.syncRestore) < 0) return -1;
-    if (tDecodeI64(&decoder, &load.cacheUsage) < 0) return -1;
-    if (tDecodeI64(&decoder, &load.numOfTables) < 0) return -1;
-    if (tDecodeI64(&decoder, &load.numOfTimeSeries) < 0) return -1;
-    if (tDecodeI64(&decoder, &load.totalStorage) < 0) return -1;
-    if (tDecodeI64(&decoder, &load.compStorage) < 0) return -1;
-    if (tDecodeI64(&decoder, &load.pointsWritten) < 0) return -1;
-    if (tDecodeI64(&decoder, &load.numOfSelectReqs) < 0) return -1;
-    if (tDecodeI64(&decoder, &load.numOfInsertReqs) < 0) return -1;
-    if (tDecodeI64(&decoder, &load.numOfInsertSuccessReqs) < 0) return -1;
-    if (tDecodeI64(&decoder, &load.numOfBatchInsertReqs) < 0) return -1;
-    if (tDecodeI64(&decoder, &load.numOfBatchInsertSuccessReqs) < 0) return -1;
-    taosArrayPush(pInfo->pVloads, &load);
-  }
-
-  tEndDecode(&decoder);
-  tDecoderClear(&decoder);
-  return 0;
-}
-
-void tFreeSMonVloadInfo(SMonVloadInfo *pInfo) {
-  taosArrayDestroy(pInfo->pVloads);
-  pInfo->pVloads = NULL;
-}
-
-int32_t tSerializeSMonMloadInfo(void *buf, int32_t bufLen, SMonMloadInfo *pInfo) {
-  SEncoder encoder = {0};
-  tEncoderInit(&encoder, buf, bufLen);
-
-  if (tStartEncode(&encoder) < 0) return -1;
-  if (tEncodeI8(&encoder, pInfo->isMnode) < 0) return -1;
-  if (tEncodeI8(&encoder, pInfo->load.syncState) < 0) return -1;
-  if (tEncodeI8(&encoder, pInfo->load.syncRestore) < 0) return -1;
-  tEndEncode(&encoder);
-
-  int32_t tlen = encoder.pos;
-  tEncoderClear(&encoder);
-  return tlen;
-}
-
-int32_t tDeserializeSMonMloadInfo(void *buf, int32_t bufLen, SMonMloadInfo *pInfo) {
-  SDecoder decoder = {0};
-  tDecoderInit(&decoder, buf, bufLen);
-
-  if (tStartDecode(&decoder) < 0) return -1;
-  if (tDecodeI8(&decoder, &pInfo->isMnode) < 0) return -1;
-  if (tDecodeI8(&decoder, &pInfo->load.syncState) < 0) return -1;
-  if (tDecodeI8(&decoder, &pInfo->load.syncRestore) < 0) return -1;
-  tEndDecode(&decoder);
-
-  tDecoderClear(&decoder);
-  return 0;
-}
-
-int32_t tSerializeSQnodeLoad(void *buf, int32_t bufLen, SQnodeLoad *pInfo) {
-  SEncoder encoder = {0};
-  tEncoderInit(&encoder, buf, bufLen);
-
-  if (tStartEncode(&encoder) < 0) return -1;
-  if (tEncodeI64(&encoder, pInfo->numOfProcessedQuery) < 0) return -1;
-  if (tEncodeI64(&encoder, pInfo->numOfProcessedCQuery) < 0) return -1;
-  if (tEncodeI64(&encoder, pInfo->numOfProcessedFetch) < 0) return -1;
-  if (tEncodeI64(&encoder, pInfo->numOfProcessedDrop) < 0) return -1;
-  if (tEncodeI64(&encoder, pInfo->numOfProcessedHb) < 0) return -1;
-  if (tEncodeI64(&encoder, pInfo->numOfProcessedDelete) < 0) return -1;
-  if (tEncodeI64(&encoder, pInfo->cacheDataSize) < 0) return -1;
-  if (tEncodeI64(&encoder, pInfo->numOfQueryInQueue) < 0) return -1;
-  if (tEncodeI64(&encoder, pInfo->numOfFetchInQueue) < 0) return -1;
-  if (tEncodeI64(&encoder, pInfo->timeInQueryQueue) < 0) return -1;
-  if (tEncodeI64(&encoder, pInfo->timeInFetchQueue) < 0) return -1;
-  tEndEncode(&encoder);
-
-  int32_t tlen = encoder.pos;
-  tEncoderClear(&encoder);
-  return tlen;
-}
-
-int32_t tDeserializeSQnodeLoad(void *buf, int32_t bufLen, SQnodeLoad *pInfo) {
-  SDecoder decoder = {0};
-  tDecoderInit(&decoder, buf, bufLen);
-
-  if (tStartDecode(&decoder) < 0) return -1;
-  if (tDecodeI64(&decoder, &pInfo->numOfProcessedQuery) < 0) return -1;
-  if (tDecodeI64(&decoder, &pInfo->numOfProcessedCQuery) < 0) return -1;
-  if (tDecodeI64(&decoder, &pInfo->numOfProcessedFetch) < 0) return -1;
-  if (tDecodeI64(&decoder, &pInfo->numOfProcessedDrop) < 0) return -1;
-  if (tDecodeI64(&decoder, &pInfo->numOfProcessedHb) < 0) return -1;
-  if (tDecodeI64(&decoder, &pInfo->numOfProcessedDelete) < 0) return -1;
-  if (tDecodeI64(&decoder, &pInfo->cacheDataSize) < 0) return -1;
-  if (tDecodeI64(&decoder, &pInfo->numOfQueryInQueue) < 0) return -1;
-  if (tDecodeI64(&decoder, &pInfo->numOfFetchInQueue) < 0) return -1;
-  if (tDecodeI64(&decoder, &pInfo->timeInQueryQueue) < 0) return -1;
-  if (tDecodeI64(&decoder, &pInfo->timeInFetchQueue) < 0) return -1;
-  tEndDecode(&decoder);
-
-  tDecoderClear(&decoder);
-  return 0;
-}
diff --git a/source/util/src/tqueue.c b/source/util/src/tqueue.c
index eb62e12a19..d34839a0ef 100644
--- a/source/util/src/tqueue.c
+++ b/source/util/src/tqueue.c
@@ -298,9 +298,6 @@ int32_t taosGetQitem(STaosQall *qall, void **ppItem) {
   return num;
 }
 
-void    taosResetQitems(STaosQall *qall) { qall->current = qall->start; }
-int32_t taosQallItemSize(STaosQall *qall) { return qall->numOfItems; }
-
 STaosQset *taosOpenQset() {
   STaosQset *qset = taosMemoryCalloc(sizeof(STaosQset), 1);
   if (qset == NULL) {
@@ -405,8 +402,6 @@ void taosRemoveFromQset(STaosQset *qset, STaosQueue *queue) {
   uDebug("queue:%p is removed from qset:%p", queue, qset);
 }
 
-int32_t taosGetQueueNumber(STaosQset *qset) { return qset->numOfQueues; }
-
 int32_t taosReadQitemFromQset(STaosQset *qset, void **ppItem, SQueueInfo *qinfo) {
   STaosQnode *pNode = NULL;
   int32_t     code = 0;
@@ -497,6 +492,12 @@ int32_t taosReadAllQitemsFromQset(STaosQset *qset, STaosQall *qall, SQueueInfo *
   return code;
 }
 
+int32_t taosQallItemSize(STaosQall *qall) { return qall->numOfItems; }
+
+#if 0
+int32_t taosGetQueueNumber(STaosQset *qset) { return qset->numOfQueues; }
+void    taosResetQitems(STaosQall *qall) { qall->current = qall->start; }
+
 void taosResetQsetThread(STaosQset *qset, void *pItem) {
   if (pItem == NULL) return;
   STaosQnode *pNode = (STaosQnode *)((char *)pItem - sizeof(STaosQnode));
@@ -507,3 +508,5 @@ void taosResetQsetThread(STaosQset *qset, void *pItem) {
   }
   taosThreadMutexUnlock(&qset->mutex);
 }
+
+#endif
diff --git a/source/util/src/tworker.c b/source/util/src/tworker.c
index e353546ca7..24790bd0e2 100644
--- a/source/util/src/tworker.c
+++ b/source/util/src/tworker.c
@@ -28,10 +28,7 @@ int32_t tQWorkerInit(SQWorkerPool *pool) {
     return -1;
   }
 
-  if (taosThreadMutexInit(&pool->mutex, NULL)) {
-    terrno = TSDB_CODE_OUT_OF_MEMORY;
-    return -1;
-  }
+  (void)taosThreadMutexInit(&pool->mutex, NULL);
 
   for (int32_t i = 0; i < pool->max; ++i) {
     SQWorker *worker = pool->workers + i;
@@ -97,14 +94,10 @@ static void *tQWorkerThreadFp(SQWorker *worker) {
 }
 
 STaosQueue *tQWorkerAllocQueue(SQWorkerPool *pool, void *ahandle, FItem fp) {
-  taosThreadMutexLock(&pool->mutex);
   STaosQueue *queue = taosOpenQueue();
-  if (queue == NULL) {
-    taosThreadMutexUnlock(&pool->mutex);
-    terrno = TSDB_CODE_OUT_OF_MEMORY;
-    return NULL;
-  }
+  if (queue == NULL) return NULL;
 
+  taosThreadMutexLock(&pool->mutex);
   taosSetQueueFp(queue, fp, NULL);
   taosAddIntoQset(pool->qset, queue, ahandle);
 
@@ -118,7 +111,6 @@ STaosQueue *tQWorkerAllocQueue(SQWorkerPool *pool, void *ahandle, FItem fp) {
       taosThreadAttrSetDetachState(&thAttr, PTHREAD_CREATE_JOINABLE);
 
       if (taosThreadCreate(&worker->thread, &thAttr, (ThreadFp)tQWorkerThreadFp, worker) != 0) {
-        uError("worker:%s:%d failed to create thread to process since %s", pool->name, worker->id, strerror(errno));
         taosCloseQueue(queue);
         terrno = TSDB_CODE_OUT_OF_MEMORY;
         queue = NULL;
@@ -150,10 +142,7 @@ int32_t tWWorkerInit(SWWorkerPool *pool) {
     return -1;
   }
 
-  if (taosThreadMutexInit(&pool->mutex, NULL) != 0) {
-    terrno = TSDB_CODE_OUT_OF_MEMORY;
-    return -1;
-  }
+  (void)taosThreadMutexInit(&pool->mutex, NULL);
 
   for (int32_t i = 0; i < pool->max; ++i) {
     SWWorker *worker = pool->workers + i;
@@ -225,48 +214,27 @@ static void *tWWorkerThreadFp(SWWorker *worker) {
 STaosQueue *tWWorkerAllocQueue(SWWorkerPool *pool, void *ahandle, FItems fp) {
   taosThreadMutexLock(&pool->mutex);
   SWWorker *worker = pool->workers + pool->nextId;
+  int32_t   code = -1;
 
   STaosQueue *queue = taosOpenQueue();
-  if (queue == NULL) {
-    taosThreadMutexUnlock(&pool->mutex);
-    terrno = TSDB_CODE_OUT_OF_MEMORY;
-    return NULL;
-  }
+  if (queue == NULL) goto _OVER;
 
   taosSetQueueFp(queue, NULL, fp);
-
   if (worker->qset == NULL) {
     worker->qset = taosOpenQset();
-    if (worker->qset == NULL) {
-      taosCloseQueue(queue);
-      taosThreadMutexUnlock(&pool->mutex);
-      return NULL;
-    }
+    if (worker->qset == NULL) goto _OVER;
 
     taosAddIntoQset(worker->qset, queue, ahandle);
     worker->qall = taosAllocateQall();
-    if (worker->qall == NULL) {
-      taosCloseQset(worker->qset);
-      taosCloseQueue(queue);
-      taosThreadMutexUnlock(&pool->mutex);
-      terrno = TSDB_CODE_OUT_OF_MEMORY;
-      return NULL;
-    }
+    if (worker->qall == NULL) goto _OVER;
+
     TdThreadAttr thAttr;
     taosThreadAttrInit(&thAttr);
     taosThreadAttrSetDetachState(&thAttr, PTHREAD_CREATE_JOINABLE);
+    if (taosThreadCreate(&worker->thread, &thAttr, (ThreadFp)tWWorkerThreadFp, worker) != 0) goto _OVER;
 
-    if (taosThreadCreate(&worker->thread, &thAttr, (ThreadFp)tWWorkerThreadFp, worker) != 0) {
-      uError("worker:%s:%d failed to create thread to process since %s", pool->name, worker->id, strerror(errno));
-      taosFreeQall(worker->qall);
-      taosCloseQset(worker->qset);
-      taosCloseQueue(queue);
-      terrno = TSDB_CODE_OUT_OF_MEMORY;
-      queue = NULL;
-    } else {
-      uDebug("worker:%s:%d is launched, max:%d", pool->name, worker->id, pool->max);
-      pool->nextId = (pool->nextId + 1) % pool->max;
-    }
+    uDebug("worker:%s:%d is launched, max:%d", pool->name, worker->id, pool->max);
+    pool->nextId = (pool->nextId + 1) % pool->max;
 
     taosThreadAttrDestroy(&thAttr);
     pool->num++;
@@ -276,10 +244,19 @@ STaosQueue *tWWorkerAllocQueue(SWWorkerPool *pool, void *ahandle, FItems fp) {
     pool->nextId = (pool->nextId + 1) % pool->max;
   }
 
-  taosThreadMutexUnlock(&pool->mutex);
   uDebug("worker:%s, queue:%p is allocated, ahandle:%p", pool->name, queue, ahandle);
 
-  return queue;
+_OVER:
+  taosThreadMutexUnlock(&pool->mutex);
+
+  if (code == -1) {
+    if (queue != NULL) taosCloseQueue(queue);
+    if (worker->qset != NULL) taosCloseQset(worker->qset);
+    if (worker->qall != NULL) taosFreeQall(worker->qall);
+    return NULL;
+  } else {
+    return queue;
+  }
 }
 
 void tWWorkerFreeQueue(SWWorkerPool *pool, STaosQueue *queue) {
@@ -292,15 +269,11 @@ int32_t tSingleWorkerInit(SSingleWorker *pWorker, const SSingleWorkerCfg *pCfg)
   pPool->name = pCfg->name;
   pPool->min = pCfg->min;
   pPool->max = pCfg->max;
-  if (tQWorkerInit(pPool) != 0) {
-    terrno = TSDB_CODE_OUT_OF_MEMORY;
-    return -1;
-  }
+  if (tQWorkerInit(pPool) != 0) return -1;
+
   pWorker->queue = tQWorkerAllocQueue(pPool, pCfg->param, pCfg->fp);
-  if (pWorker->queue == NULL) {
-    terrno = TSDB_CODE_OUT_OF_MEMORY;
-    return -1;
-  }
+  if (pWorker->queue == NULL) return -1;
+
   pWorker->name = pCfg->name;
   return 0;
 }
@@ -320,15 +293,11 @@ int32_t tMultiWorkerInit(SMultiWorker *pWorker, const SMultiWorkerCfg *pCfg) {
   SWWorkerPool *pPool = &pWorker->pool;
   pPool->name = pCfg->name;
   pPool->max = pCfg->max;
-  if (tWWorkerInit(pPool) != 0) {
-    terrno = TSDB_CODE_OUT_OF_MEMORY;
-    return -1;
-  }
+  if (tWWorkerInit(pPool) != 0) return -1;
+
   pWorker->queue = tWWorkerAllocQueue(pPool, pCfg->param, pCfg->fp);
-  if (pWorker->queue == NULL) {
-    terrno = TSDB_CODE_OUT_OF_MEMORY;
-    return -1;
-  }
+  if (pWorker->queue == NULL) return -1;
+
   pWorker->name = pCfg->name;
   return 0;
 }
diff --git a/tests/system-test/0-others/taosdMonitor.py b/tests/system-test/0-others/taosdMonitor.py
index 1d733191b7..149e39e1f8 100644
--- a/tests/system-test/0-others/taosdMonitor.py
+++ b/tests/system-test/0-others/taosdMonitor.py
@@ -294,6 +294,10 @@ class TDTestCase:
         vgroups = "30"
         sql = "create database db3 vgroups " + vgroups
         tdSql.query(sql)
+        sql = "create table db3.stb (ts timestamp, f int) tags (t int)"
+        tdSql.query(sql)
+        sql = "create table db3.tb using db3.stb tags (1)"
+        tdSql.query(sql)
 
         # create http server: bing ip/port , and  request processor
         if (platform.system().lower() == 'windows' and not tdDnodes.dnodes[0].remoteIP == ""):