diff --git a/src/mnode/src/mnodeTable.c b/src/mnode/src/mnodeTable.c
index ff81c37de78b99af19a70b8cdb6882957b029972..6297bb21d0ba45ba0363c6d7de2865e62c535014 100644
--- a/src/mnode/src/mnodeTable.c
+++ b/src/mnode/src/mnodeTable.c
@@ -396,14 +396,15 @@ static void mnodeAddTableIntoStable(SSTableObj *pStable, SCTableObj *pCtable) {
   atomic_add_fetch_32(&pStable->numOfTables, 1);
 
   if (pStable->vgHash == NULL) {
-    pStable->vgHash = taosHashInit(64, taosGetDefaultHashFunction(TSDB_DATA_TYPE_INT), true, HASH_NO_LOCK);
+    pStable->vgHash = taosHashInit(64, taosGetDefaultHashFunction(TSDB_DATA_TYPE_INT), true, HASH_ENTRY_LOCK);
+    mDebug("table:%s, create hash:%p", pStable->info.tableId, pStable->vgHash);
   }
 
   if (pStable->vgHash != NULL) {
     if (taosHashGet(pStable->vgHash, &pCtable->vgId, sizeof(pCtable->vgId)) == NULL) {
       taosHashPut(pStable->vgHash, &pCtable->vgId, sizeof(pCtable->vgId), &pCtable->vgId, sizeof(pCtable->vgId));
-      mDebug("table:%s, vgId:%d is put into stable vgList, sizeOfVgList:%d", pStable->info.tableId, pCtable->vgId,
-             (int32_t)taosHashGetSize(pStable->vgHash));
+      mDebug("table:%s, vgId:%d is put into stable hash:%p, sizeOfVgList:%d", pStable->info.tableId, pCtable->vgId,
+             pStable->vgHash, taosHashGetSize(pStable->vgHash));
     }
   }
 }
@@ -416,13 +417,14 @@ static void mnodeRemoveTableFromStable(SSTableObj *pStable, SCTableObj *pCtable)
   SVgObj *pVgroup = mnodeGetVgroup(pCtable->vgId);
   if (pVgroup == NULL) {
     taosHashRemove(pStable->vgHash, &pCtable->vgId, sizeof(pCtable->vgId));
-    mDebug("table:%s, vgId:%d is remove from stable vgList, sizeOfVgList:%d", pStable->info.tableId, pCtable->vgId,
-           (int32_t)taosHashGetSize(pStable->vgHash));
+    mDebug("table:%s, vgId:%d is remove from stable hash:%p sizeOfVgList:%d", pStable->info.tableId, pCtable->vgId,
+           pStable->vgHash, taosHashGetSize(pStable->vgHash));
   }
   mnodeDecVgroupRef(pVgroup);
 }
 
 static void mnodeDestroySuperTable(SSTableObj *pStable) {
+  mDebug("table:%s, is destroyed, stable hash:%p", pStable->info.tableId, pStable->vgHash);
   if (pStable->vgHash != NULL) {
     taosHashCleanup(pStable->vgHash);
     pStable->vgHash = NULL;
@@ -464,6 +466,9 @@ static int32_t mnodeSuperTableActionUpdate(SSdbRow *pRow) {
   SSTableObj *pNew = pRow->pObj;
   SSTableObj *pTable = mnodeGetSuperTable(pNew->info.tableId);
   if (pTable != NULL && pTable != pNew) {
+    mDebug("table:%s, will be updated, hash:%p sizeOfVgList:%d, new hash:%p sizeOfVgList:%d", pTable->info.tableId,
+           pTable->vgHash, taosHashGetSize(pTable->vgHash), pNew->vgHash, taosHashGetSize(pNew->vgHash));
+
     void *oldTableId = pTable->info.tableId;
     void *oldSchema = pTable->schema;
     void *oldVgHash = pTable->vgHash;
@@ -479,6 +484,9 @@ static int32_t mnodeSuperTableActionUpdate(SSdbRow *pRow) {
     free(pNew);
     free(oldTableId);
     free(oldSchema);
+
+    mDebug("table:%s, update finished, hash:%p sizeOfVgList:%d", pTable->info.tableId, pTable->vgHash,
+           taosHashGetSize(pTable->vgHash));
   }
 
   mnodeDecTableRef(pTable);
@@ -783,8 +791,8 @@ static int32_t mnodeProcessDropTableMsg(SMnodeMsg *pMsg) {
 
   if (pMsg->pTable->type == TSDB_SUPER_TABLE) {
     SSTableObj *pSTable = (SSTableObj *)pMsg->pTable;
-    mInfo("msg:%p, app:%p table:%s, start to drop stable, uid:%" PRIu64 ", numOfChildTables:%d, sizeOfVgList:%d",
-          pMsg, pMsg->rpcMsg.ahandle, pDrop->tableId, pSTable->uid, pSTable->numOfTables, (int32_t)taosHashGetSize(pSTable->vgHash));
+    mInfo("msg:%p, app:%p table:%s, start to drop stable, uid:%" PRIu64 ", numOfChildTables:%d, sizeOfVgList:%d", pMsg,
+          pMsg->rpcMsg.ahandle, pDrop->tableId, pSTable->uid, pSTable->numOfTables, taosHashGetSize(pSTable->vgHash));
     return mnodeProcessDropSuperTableMsg(pMsg);
   } else {
     SCTableObj *pCTable = (SCTableObj *)pMsg->pTable;
@@ -925,7 +933,10 @@ static int32_t mnodeProcessDropSuperTableMsg(SMnodeMsg *pMsg) {
   if (pMsg == NULL) return TSDB_CODE_MND_APP_ERROR;
 
   SSTableObj *pStable = (SSTableObj *)pMsg->pTable;
-   if (pStable->vgHash != NULL /*pStable->numOfTables != 0*/) {
+  mInfo("msg:%p, app:%p stable:%s will be dropped, hash:%p sizeOfVgList:%d", pMsg, pMsg->rpcMsg.ahandle,
+        pStable->info.tableId, pStable->vgHash, taosHashGetSize(pStable->vgHash));
+
+  if (pStable->vgHash != NULL /*pStable->numOfTables != 0*/) {
     int32_t *pVgId = taosHashIterate(pStable->vgHash, NULL);
     while (pVgId) {
       SVgObj *pVgroup = mnodeGetVgroup(*pVgId);
@@ -938,8 +949,9 @@ static int32_t mnodeProcessDropSuperTableMsg(SMnodeMsg *pMsg) {
       pDrop->uid = htobe64(pStable->uid);
       mnodeExtractTableName(pStable->info.tableId, pDrop->tableId);
 
-      mInfo("msg:%p, app:%p stable:%s, send drop stable msg to vgId:%d", pMsg, pMsg->rpcMsg.ahandle,
-            pStable->info.tableId, pVgroup->vgId);
+      mInfo("msg:%p, app:%p stable:%s, send drop stable msg to vgId:%d, hash:%p sizeOfVgList:%d", pMsg,
+            pMsg->rpcMsg.ahandle, pStable->info.tableId, pVgroup->vgId, pStable->vgHash,
+            taosHashGetSize(pStable->vgHash));
       SRpcEpSet epSet = mnodeGetEpSetFromVgroup(pVgroup);
       SRpcMsg   rpcMsg = {.pCont = pDrop, .contLen = sizeof(SDropSTableMsg), .msgType = TSDB_MSG_TYPE_MD_DROP_STABLE};
       dnodeSendMsgToDnode(&epSet, &rpcMsg);
@@ -1482,8 +1494,8 @@ static int32_t mnodeGetSuperTableMeta(SMnodeMsg *pMsg) {
 
   pMsg->rpcRsp.rsp = pMeta;
 
-  mDebug("msg:%p, app:%p stable:%s, uid:%" PRIu64 " table meta is retrieved", pMsg, pMsg->rpcMsg.ahandle,
-         pTable->info.tableId, pTable->uid);
+  mDebug("msg:%p, app:%p stable:%s, uid:%" PRIu64 " table meta is retrieved, sizeOfVgList:%d numOfTables:%d", pMsg,
+         pMsg->rpcMsg.ahandle, pTable->info.tableId, pTable->uid, taosHashGetSize(pTable->vgHash), pTable->numOfTables);
   return TSDB_CODE_SUCCESS;
 }
 
@@ -1512,7 +1524,7 @@ static int32_t mnodeProcessSuperTableVgroupMsg(SMnodeMsg *pMsg) {
   char *msg = (char *)pRsp + sizeof(SSTableVgroupRspMsg);
 
   for (int32_t i = 0; i < numOfTable; ++i) {
-    char *          stableName = (char *)pInfo + sizeof(SSTableVgroupMsg) + (TSDB_TABLE_FNAME_LEN)*i;
+    char *stableName = (char *)pInfo + sizeof(SSTableVgroupMsg) + (TSDB_TABLE_FNAME_LEN)*i;
     SSTableObj *pTable = mnodeGetSuperTable(stableName);
     if (pTable == NULL) {
       mError("msg:%p, app:%p stable:%s, not exist while get stable vgroup info", pMsg, pMsg->rpcMsg.ahandle, stableName);
@@ -1533,6 +1545,8 @@ static int32_t mnodeProcessSuperTableVgroupMsg(SMnodeMsg *pMsg) {
       msg += sizeof(SVgroupsMsg);
     } else {
       SVgroupsMsg *pVgroupMsg = (SVgroupsMsg *)msg;
+      mDebug("msg:%p, app:%p stable:%s, hash:%p sizeOfVgList:%d will be returned", pMsg, pMsg->rpcMsg.ahandle,
+             pTable->info.tableId, pTable->vgHash, taosHashGetSize(pTable->vgHash));
 
       int32_t *pVgId = taosHashIterate(pTable->vgHash, NULL);
       int32_t  vgSize = 0;
diff --git a/src/plugins/http/src/httpContext.c b/src/plugins/http/src/httpContext.c
index 22f464924e2c21cdeccb0c152457fad11a10294a..266228e7ac7df7641b9166e07ddba9bad7968461 100644
--- a/src/plugins/http/src/httpContext.c
+++ b/src/plugins/http/src/httpContext.c
@@ -79,7 +79,7 @@ bool httpInitContexts() {
 void httpCleanupContexts() {
   if (tsHttpServer.contextCache != NULL) {
     SCacheObj *cache = tsHttpServer.contextCache;
-    httpInfo("context cache is cleanuping, size:%" PRIzu "", taosHashGetSize(cache->pHashTable));
+    httpInfo("context cache is cleanuping, size:%d", taosHashGetSize(cache->pHashTable));
     taosCacheCleanup(tsHttpServer.contextCache);
     tsHttpServer.contextCache = NULL;
   }
diff --git a/src/plugins/http/src/httpSession.c b/src/plugins/http/src/httpSession.c
index a96e4433b065885a18b8c0b4f35e2a1925125fc3..35ce0160b20b8cec0126f5f2415a878ccb072d0e 100644
--- a/src/plugins/http/src/httpSession.c
+++ b/src/plugins/http/src/httpSession.c
@@ -107,7 +107,7 @@ static void httpDestroySession(void *data) {
 void httpCleanUpSessions() {
   if (tsHttpServer.sessionCache != NULL) {
     SCacheObj *cache = tsHttpServer.sessionCache;
-    httpInfo("session cache is cleanuping, size:%" PRIzu "", taosHashGetSize(cache->pHashTable));
+    httpInfo("session cache is cleanuping, size:%d", taosHashGetSize(cache->pHashTable));
     taosCacheCleanup(tsHttpServer.sessionCache);
     tsHttpServer.sessionCache = NULL;
   }
diff --git a/src/util/inc/hash.h b/src/util/inc/hash.h
index b0319d3e139f72bdaff7993e2e46d61b82c4d0a5..5bada93d1c77462fea0d16708fef2546976a8d99 100644
--- a/src/util/inc/hash.h
+++ b/src/util/inc/hash.h
@@ -82,7 +82,7 @@ SHashObj *taosHashInit(size_t capacity, _hash_fn_t fn, bool update, SHashLockTyp
  * @param pHashObj
  * @return
  */
-size_t taosHashGetSize(const SHashObj *pHashObj);
+int32_t taosHashGetSize(const SHashObj *pHashObj);
 
 /**
  * put element into hash table, if the element with the same key exists, update it
diff --git a/src/util/src/hash.c b/src/util/src/hash.c
index 0e3e0d3e2437f4595179c880a37642e047eb4331..7a835e87e753d98ec19809e4f3eec32bbe37e55a 100644
--- a/src/util/src/hash.c
+++ b/src/util/src/hash.c
@@ -189,7 +189,7 @@ SHashObj *taosHashInit(size_t capacity, _hash_fn_t fn, bool update, SHashLockTyp
   return pHashObj;
 }
 
-size_t taosHashGetSize(const SHashObj *pHashObj) { return (pHashObj == NULL) ? 0 : pHashObj->size; }
+int32_t taosHashGetSize(const SHashObj *pHashObj) { return (int32_t)((pHashObj == NULL) ? 0 : pHashObj->size); }
 
 int32_t taosHashPut(SHashObj *pHashObj, const void *key, size_t keyLen, void *data, size_t size) {
   uint32_t   hashVal = (*pHashObj->hashFp)(key, (uint32_t)keyLen);
diff --git a/tests/test/c/hashPerformance.c b/tests/test/c/hashPerformance.c
index db3be0e950a81e22f3ad1050cfa9a8e50b967532..111ea25a09823fbbeeda3c990d86af849c3821d8 100644
--- a/tests/test/c/hashPerformance.c
+++ b/tests/test/c/hashPerformance.c
@@ -24,15 +24,17 @@
 #define GREEN "\033[1;32m"
 #define NC "\033[0m"
 
-int32_t capacity = 100000;
-int32_t q1Times = 1;
-int32_t q2Times = 1;
+int32_t capacity = 128;
+int32_t q1Times = 10;
+int32_t q2Times = 10;
 int32_t keyNum = 100000;
-int32_t printInterval = 10000;
+int32_t printInterval = 1000;
+void *  hashHandle;
+pthread_t thread;
 
 typedef struct HashTestRow {
-  int32_t size;
-  void *  ptr;
+  int32_t keySize;
+  char    key[100];
 } HashTestRow;
 
 void shellParseArgument(int argc, char *argv[]);
@@ -40,7 +42,7 @@ void shellParseArgument(int argc, char *argv[]);
 void testHashPerformance() {
   int64_t    initialMs = taosGetTimestampMs();
   _hash_fn_t hashFp = taosGetDefaultHashFunction(TSDB_DATA_TYPE_BINARY);
-  void *     hashHandle = taosHashInit(capacity, hashFp, true);
+  hashHandle = taosHashInit(128, hashFp, true, HASH_NO_LOCK);
 
   int64_t startMs = taosGetTimestampMs();
   float   seconds = (startMs - initialMs) / 1000.0;
@@ -48,17 +50,25 @@ void testHashPerformance() {
 
   for (int32_t t = 1; t <= keyNum; ++t) {
     HashTestRow row = {0};
-    char key[100] = {0};
-    int32_t keySize = sprintf(key, "0.db.st%d", t);
+    row.keySize = sprintf(row.key, "0.db.st%d", t);
 
     for (int32_t q = 0; q < q1Times; q++) {
-      taosHashGet(hashHandle, &key, keySize);
+      taosHashGet(hashHandle, row.key, row.keySize);
     }
 
-    taosHashPut(hashHandle, key, keySize, &row, sizeof(HashTestRow));
+    taosHashPut(hashHandle, row.key, row.keySize, &row, sizeof(HashTestRow));
 
     for (int32_t q = 0; q < q2Times; q++) {
-      taosHashGet(hashHandle, &key, keySize);
+      taosHashGet(hashHandle, row.key, row.keySize);
+    }
+
+    // test iterator
+    {
+      HashTestRow *row = taosHashIterate(hashHandle, NULL);
+      while (row) {
+        taosHashGet(hashHandle, row->key, row->keySize);
+        row = taosHashIterate(hashHandle, row);
+      }
     }
 
     if (t % printInterval == 0) {
@@ -80,9 +90,35 @@ void testHashPerformance() {
   taosHashCleanup(hashHandle);
 }
 
+void *multiThreadFunc(void *param) {
+  for (int i = 0; i < 100; ++i) {
+    taosMsleep(1000);
+    HashTestRow *row = taosHashIterate(hashHandle, NULL);
+    while (row) {
+      taosHashGet(hashHandle, row->key, row->keySize);
+      row = taosHashIterate(hashHandle, row);
+    }
+    int64_t hashSize = taosHashGetSize(hashHandle);
+    pPrint("i:%d hashSize:%ld", i, hashSize);
+  }
+
+  return NULL;
+}
+
+void multiThreadTest() {
+  pthread_attr_t thattr;
+  pthread_attr_init(&thattr);
+  pthread_attr_setdetachstate(&thattr, PTHREAD_CREATE_JOINABLE);
+  
+  // Start threads to write
+  pthread_create(&thread, &thattr, multiThreadFunc, NULL);
+}
+
 int main(int argc, char *argv[]) {
   shellParseArgument(argc, argv);
+  multiThreadTest();
   testHashPerformance();
+  pthread_join(thread, NULL);
 }
 
 void printHelp() {