diff --git a/src/client/src/tscServer.c b/src/client/src/tscServer.c
index a3d3b035e2c4564acd34a71fe1c1490ddc25ec75..e85ade60e509373dd52a37e8774a6bca1c7b9d56 100644
--- a/src/client/src/tscServer.c
+++ b/src/client/src/tscServer.c
@@ -1675,8 +1675,8 @@ int tscProcessTableMetaRsp(SSqlObj *pSql) {
   STableMetaInfo *pTableMetaInfo = tscGetTableMetaInfoFromCmd(&pSql->cmd, 0, 0);
   assert(pTableMetaInfo->pTableMeta == NULL);
 
-  pTableMetaInfo->pTableMeta =
-      (STableMeta *) taosCachePut(tscCacheHandle, pTableMetaInfo->name, pTableMeta, size, tsTableMetaKeepTimer);
+  pTableMetaInfo->pTableMeta = (STableMeta *) taosCachePut(tscCacheHandle, pTableMetaInfo->name,
+      strlen(pTableMetaInfo->name), pTableMeta, size, tsTableMetaKeepTimer);
   
   // todo handle out of memory case
   if (pTableMetaInfo->pTableMeta == NULL) {
@@ -1879,7 +1879,8 @@ int tscProcessShowRsp(SSqlObj *pSql) {
   size_t size = 0;
   STableMeta* pTableMeta = tscCreateTableMetaFromMsg(pMetaMsg, &size);
   
-  pTableMetaInfo->pTableMeta = taosCachePut(tscCacheHandle, key, (char *)pTableMeta, size, tsTableMetaKeepTimer);
+  pTableMetaInfo->pTableMeta = taosCachePut(tscCacheHandle, key, strlen(key), (char *)pTableMeta, size,
+      tsTableMetaKeepTimer);
   SSchema *pTableSchema = tscGetTableSchema(pTableMetaInfo->pTableMeta);
 
   if (pQueryInfo->colList == NULL) {
@@ -1949,9 +1950,8 @@ int tscProcessDropDbRsp(SSqlObj *UNUSED_PARAM(pSql)) {
 int tscProcessDropTableRsp(SSqlObj *pSql) {
   STableMetaInfo *pTableMetaInfo = tscGetTableMetaInfoFromCmd(&pSql->cmd, 0, 0);
 
-  STableMeta *pTableMeta = taosCacheAcquireByName(tscCacheHandle, pTableMetaInfo->name);
-  if (pTableMeta == NULL) {
-    /* not in cache, abort */
+  STableMeta *pTableMeta = taosCacheAcquireByKey(tscCacheHandle, pTableMetaInfo->name, strlen(pTableMetaInfo->name));
+  if (pTableMeta == NULL) { /* not in cache, abort */
     return 0;
   }
 
@@ -1975,7 +1975,7 @@ int tscProcessDropTableRsp(SSqlObj *pSql) {
 int tscProcessAlterTableMsgRsp(SSqlObj *pSql) {
   STableMetaInfo *pTableMetaInfo = tscGetTableMetaInfoFromCmd(&pSql->cmd, 0, 0);
 
-  STableMeta *pTableMeta = taosCacheAcquireByName(tscCacheHandle, pTableMetaInfo->name);
+  STableMeta *pTableMeta = taosCacheAcquireByKey(tscCacheHandle, pTableMetaInfo->name, strlen(pTableMetaInfo->name));
   if (pTableMeta == NULL) { /* not in cache, abort */
     return 0;
   }
@@ -2125,7 +2125,7 @@ int32_t tscGetTableMeta(SSqlObj *pSql, STableMetaInfo *pTableMetaInfo) {
     taosCacheRelease(tscCacheHandle, (void **)&(pTableMetaInfo->pTableMeta), false);
   }
   
-  pTableMetaInfo->pTableMeta = (STableMeta *)taosCacheAcquireByName(tscCacheHandle, pTableMetaInfo->name);
+  pTableMetaInfo->pTableMeta = (STableMeta *)taosCacheAcquireByKey(tscCacheHandle, pTableMetaInfo->name, strlen(pTableMetaInfo->name));
   if (pTableMetaInfo->pTableMeta != NULL) {
     STableComInfo tinfo = tscGetTableInfo(pTableMetaInfo->pTableMeta);
     tscDebug("%p retrieve table Meta from cache, the number of columns:%d, numOfTags:%d, %p", pSql, tinfo.numOfColumns,
diff --git a/src/client/src/tscSystem.c b/src/client/src/tscSystem.c
index 201ace43de171025b902d30d043cea04b755c02a..f1d69fa261ced440841ea4c4a574c5ace3a00594 100644
--- a/src/client/src/tscSystem.c
+++ b/src/client/src/tscSystem.c
@@ -148,7 +148,7 @@ void taos_init_imp() {
   refreshTime = refreshTime < 10 ? 10 : refreshTime;
 
   if (tscCacheHandle == NULL) {
-    tscCacheHandle = taosCacheInit(refreshTime);
+    tscCacheHandle = taosCacheInit(TSDB_DATA_TYPE_BINARY, refreshTime, false, NULL);
   }
 
   tscDebug("client is initialized successfully");
diff --git a/src/inc/query.h b/src/inc/query.h
index 5fd2ede034ebfaaf86eecce7a429c33996606027..af3a89682c8c931b4e3aa5db250bb5e082759bdd 100644
--- a/src/inc/query.h
+++ b/src/inc/query.h
@@ -20,6 +20,7 @@ extern "C" {
 #endif
 
 typedef void* qinfo_t;
+typedef void (*_qinfo_free_fn_t)(void*);
 
 /**
  * create the qinfo object according to QueryTableMsg
@@ -28,15 +29,13 @@ typedef void* qinfo_t;
  * @param qinfo
  * @return
  */
-int32_t qCreateQueryInfo(void* tsdb, int32_t vgId, SQueryTableMsg* pQueryTableMsg, qinfo_t* qinfo);
+int32_t qCreateQueryInfo(void* tsdb, int32_t vgId, SQueryTableMsg* pQueryTableMsg, void* param, _qinfo_free_fn_t fn, qinfo_t* qinfo);
 
 /**
  * Destroy QInfo object
  * @param qinfo  qhandle
- * @param fp     destroy callback function, while the qhandle is destoried, invoke the fp
- * @param param  free callback params
  */
-void qDestroyQueryInfo(qinfo_t qinfo, void (*fp)(void*), void* param);
+void qDestroyQueryInfo(qinfo_t qinfo);
 
 /**
  * the main query execution function, including query on both table and multitables,
@@ -81,11 +80,9 @@ bool qHasMoreResultsToRetrieve(qinfo_t qinfo);
 /**
  * kill current ongoing query and free query handle automatically
  * @param qinfo  qhandle
- * @param fp     destroy callback function, while the qhandle is destoried, invoke the fp
- * @param param  free callback params
  * @return
  */
-int32_t qKillQuery(qinfo_t qinfo, void (*fp)(void*), void* param);
+int32_t qKillQuery(qinfo_t qinfo);
 
 #ifdef __cplusplus
 }
diff --git a/src/mnode/src/mnodeProfile.c b/src/mnode/src/mnodeProfile.c
index f3d6a3d344c84cdd03b43300ed0e3e1d416ec50d..a1d4be93c66898cb883850ceff87cac120f143ef 100644
--- a/src/mnode/src/mnodeProfile.c
+++ b/src/mnode/src/mnodeProfile.c
@@ -68,7 +68,7 @@ int32_t mnodeInitProfile() {
   mnodeAddWriteMsgHandle(TSDB_MSG_TYPE_CM_KILL_STREAM, mnodeProcessKillStreamMsg);
   mnodeAddWriteMsgHandle(TSDB_MSG_TYPE_CM_KILL_CONN, mnodeProcessKillConnectionMsg);
 
-  tsMnodeConnCache = taosCacheInitWithCb(CONN_CHECK_TIME, mnodeFreeConn);
+  tsMnodeConnCache = taosCacheInitWithCb(TSDB_DATA_TYPE_BINARY, CONN_CHECK_TIME,false, mnodeFreeConn);
   return 0;
 }
 
@@ -101,8 +101,8 @@ SConnObj *mnodeCreateConn(char *user, uint32_t ip, uint16_t port) {
   tstrncpy(connObj.user, user, sizeof(connObj.user));
   
   char key[10];
-  sprintf(key, "%u", connId);  
-  SConnObj *pConn = taosCachePut(tsMnodeConnCache, key, &connObj, sizeof(connObj), CONN_KEEP_TIME);
+  int32_t len = sprintf(key, "%u", connId);
+  SConnObj *pConn = taosCachePut(tsMnodeConnCache, key, len, &connObj, sizeof(connObj), CONN_KEEP_TIME);
   
   mDebug("connId:%d, is created, user:%s ip:%s:%u", connId, user, taosIpStr(ip), port);
   return pConn;
@@ -115,10 +115,10 @@ void mnodeReleaseConn(SConnObj *pConn) {
 
 SConnObj *mnodeAccquireConn(uint32_t connId, char *user, uint32_t ip, uint16_t port) {
   char key[10];
-  sprintf(key, "%u", connId);
+  int32_t len = sprintf(key, "%u", connId);
   uint64_t expireTime = CONN_KEEP_TIME * 1000 + (uint64_t)taosGetTimestampMs();
 
-  SConnObj *pConn = taosCacheUpdateExpireTimeByName(tsMnodeConnCache, key, expireTime);
+  SConnObj *pConn = taosCacheUpdateExpireTimeByName(tsMnodeConnCache, key, len, expireTime);
   if (pConn == NULL) {
     mError("connId:%d, is already destroyed, user:%s ip:%s:%u", connId, user, taosIpStr(ip), port);
     return NULL;
@@ -547,7 +547,7 @@ static int32_t mnodeProcessKillQueryMsg(SMnodeMsg *pMsg) {
 
   int32_t queryId = (int32_t)strtol(queryIdStr, NULL, 10);
 
-  SConnObj *pConn = taosCacheAcquireByName(tsMnodeConnCache, connIdStr);
+  SConnObj *pConn = taosCacheAcquireByKey(tsMnodeConnCache, connIdStr, strlen(connIdStr));
   if (pConn == NULL) {
     mError("connId:%s, failed to kill queryId:%d, conn not exist", connIdStr, queryId);
     return TSDB_CODE_MND_INVALID_CONN_ID;
@@ -577,7 +577,7 @@ static int32_t mnodeProcessKillStreamMsg(SMnodeMsg *pMsg) {
 
   int32_t streamId = (int32_t)strtol(streamIdStr, NULL, 10);
 
-  SConnObj *pConn = taosCacheAcquireByName(tsMnodeConnCache, connIdStr);
+  SConnObj *pConn = taosCacheAcquireByKey(tsMnodeConnCache, connIdStr, strlen(connIdStr));
   if (pConn == NULL) {
     mError("connId:%s, failed to kill streamId:%d, conn not exist", connIdStr, streamId);
     return TSDB_CODE_MND_INVALID_CONN_ID;
@@ -594,7 +594,7 @@ static int32_t mnodeProcessKillConnectionMsg(SMnodeMsg *pMsg) {
   if (strcmp(pUser->user, TSDB_DEFAULT_USER) != 0) return TSDB_CODE_MND_NO_RIGHTS;
 
   SCMKillConnMsg *pKill = pMsg->rpcMsg.pCont;
-  SConnObj *      pConn = taosCacheAcquireByName(tsMnodeConnCache, pKill->queryId);
+  SConnObj *      pConn = taosCacheAcquireByKey(tsMnodeConnCache, pKill->queryId, strlen(pKill->queryId));
   if (pConn == NULL) {
     mError("connId:%s, failed to kill, conn not exist", pKill->queryId);
     return TSDB_CODE_MND_INVALID_CONN_ID;
diff --git a/src/mnode/src/mnodeShow.c b/src/mnode/src/mnodeShow.c
index 06ef2cb452fb063f642b12c6b3c7c5cf44d1b673..12b434a5131fc5a3188e383f4e25b62262f4e5d1 100644
--- a/src/mnode/src/mnodeShow.c
+++ b/src/mnode/src/mnodeShow.c
@@ -65,7 +65,7 @@ int32_t mnodeInitShow() {
   mnodeAddReadMsgHandle(TSDB_MSG_TYPE_CM_CONNECT, mnodeProcessConnectMsg);
   mnodeAddReadMsgHandle(TSDB_MSG_TYPE_CM_USE_DB, mnodeProcessUseMsg);
   
-  tsMnodeShowCache = taosCacheInitWithCb(5, mnodeFreeShowObj);
+  tsMnodeShowCache = taosCacheInitWithCb(TSDB_DATA_TYPE_BINARY, 5, false, mnodeFreeShowObj);
   return 0;
 }
 
@@ -365,9 +365,9 @@ static bool mnodeCheckShowFinished(SShowObj *pShow) {
 
 static bool mnodeAccquireShowObj(SShowObj *pShow) {
   char key[10];
-  sprintf(key, "%d", pShow->index);
+  int32_t len = sprintf(key, "%d", pShow->index);
 
-  SShowObj *pSaved = taosCacheAcquireByName(tsMnodeShowCache, key);
+  SShowObj *pSaved = taosCacheAcquireByKey(tsMnodeShowCache, key, len);
   if (pSaved == pShow) {
     mDebug("%p, show is accquired from cache", pShow);
     return true;
@@ -380,9 +380,9 @@ static void *mnodePutShowObj(SShowObj *pShow, int32_t size) {
   if (tsMnodeShowCache != NULL) {
     char key[10];
     pShow->index = atomic_add_fetch_32(&tsShowObjIndex, 1);
-    sprintf(key, "%d", pShow->index);
+    int32_t len = sprintf(key, "%d", pShow->index);
 
-    SShowObj *newQhandle = taosCachePut(tsMnodeShowCache, key, pShow, size, 6);
+    SShowObj *newQhandle = taosCachePut(tsMnodeShowCache, key, len, pShow, size, 6);
     free(pShow);
 
     mDebug("%p, show is put into cache, index:%s", newQhandle, key);
diff --git a/src/plugins/http/src/httpContext.c b/src/plugins/http/src/httpContext.c
index b09f34b562294e13f9ee7e9e728f1ad974f8c9b1..46e7fd45fac42418650ce0dfdb0b0abb8316b1ed 100644
--- a/src/plugins/http/src/httpContext.c
+++ b/src/plugins/http/src/httpContext.c
@@ -58,7 +58,7 @@ static void httpDestroyContext(void *data) {
 }
 
 bool httpInitContexts() {
-  tsHttpServer.contextCache = taosCacheInitWithCb(2, httpDestroyContext);
+  tsHttpServer.contextCache = taosCacheInitWithCb(TSDB_DATA_TYPE_BINARY, 2, false, httpDestroyContext);
   if (tsHttpServer.contextCache == NULL) {
     httpError("failed to init context cache");
     return false;
@@ -104,14 +104,14 @@ HttpContext *httpCreateContext(int32_t fd) {
   if (pContext == NULL) return NULL;
 
   char contextStr[16] = {0};
-  snprintf(contextStr, sizeof(contextStr), "%p", pContext);
+  int32_t keySize = snprintf(contextStr, sizeof(contextStr), "%p", pContext);
   
   pContext->fd = fd;
   pContext->httpVersion = HTTP_VERSION_10;
   pContext->lastAccessTime = taosGetTimestampSec();
   pContext->state = HTTP_CONTEXT_STATE_READY;
   
-  HttpContext **ppContext = taosCachePut(tsHttpServer.contextCache, contextStr, &pContext, sizeof(HttpContext *), 3);
+  HttpContext **ppContext = taosCachePut(tsHttpServer.contextCache, contextStr, keySize, &pContext, sizeof(HttpContext *), 3);
   pContext->ppContext = ppContext;
   httpDebug("context:%p, fd:%d, is created, item:%p", pContext, fd, ppContext);
 
@@ -123,9 +123,9 @@ HttpContext *httpCreateContext(int32_t fd) {
 
 HttpContext *httpGetContext(void *ptr) {
   char contextStr[16] = {0};
-  snprintf(contextStr, sizeof(contextStr), "%p", ptr);
+  int32_t len = snprintf(contextStr, sizeof(contextStr), "%p", ptr);
   
-  HttpContext **ppContext = taosCacheAcquireByName(tsHttpServer.contextCache, contextStr);
+  HttpContext **ppContext = taosCacheAcquireByKey(tsHttpServer.contextCache, contextStr, len);
   
   if (ppContext) {
     HttpContext *pContext = *ppContext;
diff --git a/src/plugins/http/src/httpSession.c b/src/plugins/http/src/httpSession.c
index 83602e1291646d2f574b2628569eb5a95fa8e2de..3a901167d522adb725537f8ed5834bd68e1b6cb4 100644
--- a/src/plugins/http/src/httpSession.c
+++ b/src/plugins/http/src/httpSession.c
@@ -33,9 +33,9 @@ void httpCreateSession(HttpContext *pContext, void *taos) {
   memset(&session, 0, sizeof(HttpSession));
   session.taos = taos;
   session.refCount = 1;
-  snprintf(session.id, HTTP_SESSION_ID_LEN, "%s.%s", pContext->user, pContext->pass);
+  int32_t len = snprintf(session.id, HTTP_SESSION_ID_LEN, "%s.%s", pContext->user, pContext->pass);
 
-  pContext->session = taosCachePut(server->sessionCache, session.id, &session, sizeof(HttpSession), tsHttpSessionExpire);
+  pContext->session = taosCachePut(server->sessionCache, session.id, len, &session, sizeof(HttpSession), tsHttpSessionExpire);
   // void *temp = pContext->session;
   // taosCacheRelease(server->sessionCache, (void **)&temp, false);
 
@@ -57,9 +57,9 @@ static void httpFetchSessionImp(HttpContext *pContext) {
   pthread_mutex_lock(&server->serverMutex);
 
   char sessionId[HTTP_SESSION_ID_LEN];
-  snprintf(sessionId, HTTP_SESSION_ID_LEN, "%s.%s", pContext->user, pContext->pass);
+  int32_t len = snprintf(sessionId, HTTP_SESSION_ID_LEN, "%s.%s", pContext->user, pContext->pass);
 
-  pContext->session = taosCacheAcquireByName(server->sessionCache, sessionId);
+  pContext->session = taosCacheAcquireByKey(server->sessionCache, sessionId, len);
   if (pContext->session != NULL) {
     atomic_add_fetch_32(&pContext->session->refCount, 1);
     httpDebug("context:%p, fd:%d, ip:%s, user:%s, find an exist session:%p:%p, sessionRef:%d", pContext, pContext->fd,
@@ -115,7 +115,7 @@ void httpCleanUpSessions() {
 }
 
 bool httpInitSessions() {
-  tsHttpServer.sessionCache = taosCacheInitWithCb(5, httpDestroySession);
+  tsHttpServer.sessionCache = taosCacheInitWithCb(TSDB_DATA_TYPE_BINARY, 5, false, httpDestroySession);
   if (tsHttpServer.sessionCache == NULL) {
     httpError("failed to init session cache");
     return false;
diff --git a/src/query/inc/qExecutor.h b/src/query/inc/qExecutor.h
index a83072384595d96fc60cc57ff35b1502c4b83b49..d7d59230b65bff91d28f42e732a54acb176019f7 100644
--- a/src/query/inc/qExecutor.h
+++ b/src/query/inc/qExecutor.h
@@ -27,6 +27,7 @@
 #include "tref.h"
 #include "tsdb.h"
 #include "tsqlfunction.h"
+#include "query.h"
 
 struct SColumnFilterElem;
 typedef bool (*__filter_func_t)(struct SColumnFilterElem* pFilter, char* val1, char* val2);
@@ -181,13 +182,13 @@ typedef struct SQueryRuntimeEnv {
 } SQueryRuntimeEnv;
 
 typedef struct SQInfo {
-  void*   signature;
-  int32_t pointsInterpo;
-  int32_t code;  // error code to returned to client
-  sem_t   dataReady;
-  void*   tsdb;
-  int32_t vgId;
-
+  void*            signature;
+  int32_t          pointsInterpo;
+  int32_t          code;  // error code to returned to client
+  sem_t            dataReady;
+  void*            tsdb;
+  void*            param;
+  int32_t          vgId;
   STableGroupInfo  tableGroupInfo;       // table id list < only includes the STable list>
   STableGroupInfo  tableqinfoGroupInfo;  // this is a group array list, including SArray<STableQueryInfo*> structure
   SQueryRuntimeEnv runtimeEnv;
@@ -202,8 +203,9 @@ typedef struct SQInfo {
    * We later may refactor to remove this attribution by using another flag to denote
    * whether a multimeter query is completed or not.
    */
-  int32_t tableIndex;
-  int32_t numOfGroupResultPages;
+  int32_t          tableIndex;
+  int32_t          numOfGroupResultPages;
+  _qinfo_free_fn_t fn;
 } SQInfo;
 
 #endif  // TDENGINE_QUERYEXECUTOR_H
diff --git a/src/query/src/qExecutor.c b/src/query/src/qExecutor.c
index 5a17e4e1e842b785538546ab0ee149f9b6e5dcc6..f33d739ba1f41e22c90ee33f6cc6133febbe0bee 100644
--- a/src/query/src/qExecutor.c
+++ b/src/query/src/qExecutor.c
@@ -4069,7 +4069,7 @@ static SFillColInfo* taosCreateFillColInfo(SQuery* pQuery) {
   return pFillCol;
 }
 
-int32_t doInitQInfo(SQInfo *pQInfo, void *param, void *tsdb, int32_t vgId, bool isSTableQuery) {
+int32_t doInitQInfo(SQInfo *pQInfo, STSBuf *pTsBuf, void *tsdb, int32_t vgId, bool isSTableQuery, void* freeParam, _qinfo_free_fn_t fn) {
   int32_t code = TSDB_CODE_SUCCESS;
   
   SQueryRuntimeEnv *pRuntimeEnv = &pQInfo->runtimeEnv;
@@ -4083,14 +4083,16 @@ int32_t doInitQInfo(SQInfo *pQInfo, void *param, void *tsdb, int32_t vgId, bool
   
   pQInfo->tsdb = tsdb;
   pQInfo->vgId = vgId;
+  pQInfo->param = freeParam;
+  pQInfo->fn = fn;
 
   pRuntimeEnv->pQuery = pQuery;
-  pRuntimeEnv->pTSBuf = param;
+  pRuntimeEnv->pTSBuf = pTsBuf;
   pRuntimeEnv->cur.vgroupIndex = -1;
   pRuntimeEnv->stableQuery = isSTableQuery;
   pRuntimeEnv->prevGroupId = INT32_MIN;
 
-  if (param != NULL) {
+  if (pTsBuf != NULL) {
     int16_t order = (pQuery->order.order == pRuntimeEnv->pTSBuf->tsOrder) ? TSDB_ORDER_ASC : TSDB_ORDER_DESC;
     tsBufSetTraverseOrder(pRuntimeEnv->pTSBuf, order);
   }
@@ -5697,8 +5699,7 @@ static bool isValidQInfo(void *param) {
   return (sig == (uint64_t)pQInfo);
 }
 
-
-static int32_t initQInfo(SQueryTableMsg *pQueryMsg, void *tsdb, int32_t vgId, SQInfo *pQInfo, bool isSTable) {
+static int32_t initQInfo(SQueryTableMsg *pQueryMsg, void *tsdb, int32_t vgId, SQInfo *pQInfo, bool isSTable, void* param, _qinfo_free_fn_t fn) {
   int32_t code = TSDB_CODE_SUCCESS;
   SQuery *pQuery = pQInfo->runtimeEnv.pQuery;
 
@@ -5731,7 +5732,7 @@ static int32_t initQInfo(SQueryTableMsg *pQueryMsg, void *tsdb, int32_t vgId, SQ
   }
 
   // filter the qualified
-  if ((code = doInitQInfo(pQInfo, pTSBuf, tsdb, vgId, isSTable)) != TSDB_CODE_SUCCESS) {
+  if ((code = doInitQInfo(pQInfo, pTSBuf, tsdb, vgId, isSTable, param, fn)) != TSDB_CODE_SUCCESS) {
     goto _error;
   }
   
@@ -5894,7 +5895,8 @@ static int32_t doDumpQueryResult(SQInfo *pQInfo, char *data) {
   return TSDB_CODE_SUCCESS;
 }
 
-int32_t qCreateQueryInfo(void *tsdb, int32_t vgId, SQueryTableMsg *pQueryMsg, qinfo_t *pQInfo) {
+int32_t qCreateQueryInfo(void* tsdb, int32_t vgId, SQueryTableMsg* pQueryMsg, void* param, _qinfo_free_fn_t fn,
+    qinfo_t* pQInfo) {
   assert(pQueryMsg != NULL);
 
   int32_t code = TSDB_CODE_SUCCESS;
@@ -5984,7 +5986,7 @@ int32_t qCreateQueryInfo(void *tsdb, int32_t vgId, SQueryTableMsg *pQueryMsg, qi
     goto _over;
   }
 
-  code = initQInfo(pQueryMsg, tsdb, vgId, *pQInfo, isSTableQuery);
+  code = initQInfo(pQueryMsg, tsdb, vgId, *pQInfo, isSTableQuery, param, fn);
 
 _over:
   free(tagCond);
@@ -6020,7 +6022,7 @@ static void doDestoryQueryInfo(SQInfo* pQInfo) {
   freeQInfo(pQInfo);
 }
 
-void qDestroyQueryInfo(qinfo_t qHandle, void (*fp)(void*), void* param) {
+void qDestroyQueryInfo(qinfo_t qHandle) {
   SQInfo* pQInfo = (SQInfo*) qHandle;
   if (!isValidQInfo(pQInfo)) {
     return;
@@ -6030,11 +6032,15 @@ void qDestroyQueryInfo(qinfo_t qHandle, void (*fp)(void*), void* param) {
   qDebug("QInfo:%p dec refCount, value:%d", pQInfo, ref);
 
   if (ref == 0) {
-    doDestoryQueryInfo(pQInfo);
+    _qinfo_free_fn_t fn = pQInfo->fn;
+    void* param = pQInfo->param;
 
-    if (fp != NULL) {
-      fp(param);
+    doDestoryQueryInfo(pQInfo);
+    if (fn != NULL) {
+      assert(param != NULL);
+      fn(param);
     }
+
   }
 }
 
@@ -6048,7 +6054,7 @@ void qTableQuery(qinfo_t qinfo, void (*fp)(void*), void* param) {
 
   if (isQueryKilled(pQInfo)) {
     qDebug("QInfo:%p it is already killed, abort", pQInfo);
-    qDestroyQueryInfo(pQInfo, fp, param);
+    qDestroyQueryInfo(pQInfo);
     return;
   }
 
@@ -6069,7 +6075,7 @@ void qTableQuery(qinfo_t qinfo, void (*fp)(void*), void* param) {
   }
 
   sem_post(&pQInfo->dataReady);
-  qDestroyQueryInfo(pQInfo, fp, param);
+  qDestroyQueryInfo(pQInfo);
 }
 
 int32_t qRetrieveQueryResultInfo(qinfo_t qinfo) {
@@ -6162,7 +6168,7 @@ int32_t qDumpRetrieveResult(qinfo_t qinfo, SRetrieveTableRsp **pRsp, int32_t *co
   return code;
 }
 
-int32_t qKillQuery(qinfo_t qinfo, void (*fp)(void*), void* param) {
+int32_t qKillQuery(qinfo_t qinfo) {
   SQInfo *pQInfo = (SQInfo *)qinfo;
 
   if (pQInfo == NULL || !isValidQInfo(pQInfo)) {
@@ -6170,8 +6176,7 @@ int32_t qKillQuery(qinfo_t qinfo, void (*fp)(void*), void* param) {
   }
 
   setQueryKilled(pQInfo);
-  qDestroyQueryInfo(pQInfo, fp, param);
-
+  qDestroyQueryInfo(pQInfo);
   return TSDB_CODE_SUCCESS;
 }
 
diff --git a/src/util/inc/tcache.h b/src/util/inc/tcache.h
index 17b38238316bf74d67824b119b774a8cd5804860..cd3d0d436f68b25fdc9fa71175acaaea5b5f408c 100644
--- a/src/util/inc/tcache.h
+++ b/src/util/inc/tcache.h
@@ -24,6 +24,8 @@ extern "C" {
 #include "tref.h"
 #include "hash.h"
 
+typedef void (*__cache_freeres_fn_t)(void*);
+
 typedef struct SCacheStatis {
   int64_t missCount;
   int64_t hitCount;
@@ -34,14 +36,15 @@ typedef struct SCacheStatis {
 
 typedef struct SCacheDataNode {
   uint64_t addedTime;    // the added time when this element is added or updated into cache
-  uint64_t expiredTime;  // expiredTime expiredTime when this element should be remove from cache
+  uint64_t lifespan;     // expiredTime expiredTime when this element should be remove from cache
   uint64_t signature;
   uint32_t size;         // allocated size for current SCacheDataNode
-  uint16_t keySize: 15;
-  bool     inTrashCan: 1;// denote if it is in trash or not
   T_REF_DECLARE()
-  char *key;
-  char  data[];
+  uint16_t keySize: 15;  // max key size: 32kb
+  bool     inTrashCan: 1;// denote if it is in trash or not
+  int32_t  extendFactor; // number of life span extend
+  char    *key;
+  char     data[];
 } SCacheDataNode;
 
 typedef struct STrashElem {
@@ -62,29 +65,32 @@ typedef struct {
   int64_t         totalSize;          // total allocated buffer in this hash table, SCacheObj is not included.
   int64_t         refreshTime;
   STrashElem *    pTrash;
-  void *          tmrCtrl;
-  void *          pTimer;
+//  void *          tmrCtrl;
+//  void *          pTimer;
   SCacheStatis    statistics;
   SHashObj *      pHashTable;
-  _hash_free_fn_t freeFp;
+  __cache_freeres_fn_t freeFp;
   uint32_t        numOfElemsInTrash;  // number of element in trash
   uint8_t         deleting;           // set the deleting flag to stop refreshing ASAP.
   pthread_t       refreshWorker;
-
+  bool            extendLifespan;     // auto extend life span when one item is accessed.
 #if defined(LINUX)
   pthread_rwlock_t lock;
 #else
-  pthread_mutex_t lock;
+  pthread_mutex_t  lock;
 #endif
 } SCacheObj;
 
 /**
  * initialize the cache object
- * @param refreshTime       refresh operation interval time, the maximum survival time when one element is expired and
- *                          not referenced by other objects
+ * @param keyType              key type
+ * @param refreshTimeInSeconds refresh operation interval time, the maximum survival time when one element is expired
+ *                             and not referenced by other objects
+ * @param extendLifespan       auto extend lifespan, if accessed
+ * @param fn                   free resource callback function
  * @return
  */
-SCacheObj *taosCacheInit(int64_t refreshTimeInSeconds);
+SCacheObj *taosCacheInit(int32_t keyType, int64_t refreshTimeInSeconds, bool extendLifespan, __cache_freeres_fn_t fn);
 
 /**
  * initialize the cache object and set the free object callback function
@@ -92,7 +98,7 @@ SCacheObj *taosCacheInit(int64_t refreshTimeInSeconds);
  * @param freeCb
  * @return
  */
-SCacheObj *taosCacheInitWithCb(int64_t refreshTimeInSeconds, void (*freeCb)(void *data));
+SCacheObj *taosCacheInitWithCb(int32_t keyType, int64_t refreshTimeInSeconds, bool extendLifespan, __cache_freeres_fn_t fn);
 
 /**
  * add data into cache
@@ -104,7 +110,7 @@ SCacheObj *taosCacheInitWithCb(int64_t refreshTimeInSeconds, void (*freeCb)(void
  * @param keepTime      survival time in second
  * @return              cached element
  */
-void *taosCachePut(SCacheObj *pCacheObj, const char *key, const void *pData, size_t dataSize, int keepTimeInSeconds);
+void *taosCachePut(SCacheObj *pCacheObj, const void *key, size_t keyLen, const void *pData, size_t dataSize, int keepTimeInSeconds);
 
 /**
  * get data from cache
@@ -112,22 +118,23 @@ void *taosCachePut(SCacheObj *pCacheObj, const char *key, const void *pData, siz
  * @param key           key
  * @return              cached data or NULL
  */
-void *taosCacheAcquireByName(SCacheObj *pCacheObj, const char *key);
+void *taosCacheAcquireByKey(SCacheObj *pCacheObj, const void *key, size_t keyLen);
 
 /**
  * update the expire time of data in cache 
  * @param pCacheObj     cache object
  * @param key           key
+ * @param keyLen        keyLen
  * @param expireTime    new expire time of data
  * @return
  */ 
-void* taosCacheUpdateExpireTimeByName(SCacheObj *pCacheObj, const char *key, uint64_t expireTime);
+void* taosCacheUpdateExpireTimeByName(SCacheObj *pCacheObj, const char *key, size_t keyLen, uint64_t expireTime);
 
 /**
  * Add one reference count for the exist data, and assign this data for a new owner.
  * The new owner needs to invoke the taosCacheRelease when it does not need this data anymore.
- * This procedure is a faster version of taosCacheAcquireByName function, which avoids the sideeffect of the problem of
- * the data is moved to trash, and taosCacheAcquireByName will fail to retrieve it again.
+ * This procedure is a faster version of taosCacheAcquireByKey function, which avoids the sideeffect of the problem of
+ * the data is moved to trash, and taosCacheAcquireByKey will fail to retrieve it again.
  *
  * @param handle
  * @param data
@@ -148,8 +155,7 @@ void *taosCacheTransfer(SCacheObj *pCacheObj, void **data);
  * if it is referenced by other object, it will be remain in cache
  * @param handle    cache object
  * @param data      not the key, actually referenced data
- * @param _remove   force model, reduce the ref count and move the data into
- * pTrash
+ * @param _remove   force model, reduce the ref count and move the data into pTrash
  */
 void taosCacheRelease(SCacheObj *pCacheObj, void **data, bool _remove);
 
diff --git a/src/util/src/tcache.c b/src/util/src/tcache.c
index 720741f0893086d4c9c3fb59bee0adfe4dc3f534..d763472a12dbff7ee7db6a2fc6b6a887e63a7465 100644
--- a/src/util/src/tcache.c
+++ b/src/util/src/tcache.c
@@ -119,7 +119,7 @@ static FORCE_INLINE void taosCacheReleaseNode(SCacheObj *pCacheObj, SCacheDataNo
   int32_t size = pNode->size;
   taosHashRemove(pCacheObj->pHashTable, pNode->key, pNode->keySize);
   
-  uDebug("key:%s, is removed from cache, total:%" PRId64 " size:%d bytes", pNode->key, pCacheObj->totalSize, size);  
+  uDebug("key:%p, is removed from cache,total:%" PRId64 ",size:%dbytes", pNode->key, pCacheObj->totalSize, size);
   if (pCacheObj->freeFp) pCacheObj->freeFp(pNode->data);
   free(pNode);
 }
@@ -167,7 +167,7 @@ static SCacheDataNode *taosUpdateCacheImpl(SCacheObj *pCacheObj, SCacheDataNode
     
     // update the timestamp information for updated key/value
     pNewNode->addedTime = taosGetTimestampMs();
-    pNewNode->expiredTime = pNewNode->addedTime + duration;
+    pNewNode->lifespan = duration;
     
     T_REF_INC(pNewNode);
     
@@ -224,8 +224,8 @@ static void doCleanupDataCache(SCacheObj *pCacheObj);
  */
 static void* taosCacheRefresh(void *handle);
 
-SCacheObj *taosCacheInitWithCb(int64_t refreshTime, void (*freeCb)(void *data)) {
-  if (refreshTime <= 0) {
+SCacheObj *taosCacheInitWithCb(int32_t keyType, int64_t refreshTimeInSeconds, bool extendLifespan, __cache_freeres_fn_t fn) {
+  if (refreshTimeInSeconds <= 0) {
     return NULL;
   }
   
@@ -235,7 +235,7 @@ SCacheObj *taosCacheInitWithCb(int64_t refreshTime, void (*freeCb)(void *data))
     return NULL;
   }
   
-  pCacheObj->pHashTable = taosHashInit(128, taosGetDefaultHashFunction(TSDB_DATA_TYPE_BINARY), false);
+  pCacheObj->pHashTable = taosHashInit(128, taosGetDefaultHashFunction(keyType), false);
   if (pCacheObj->pHashTable == NULL) {
     free(pCacheObj);
     uError("failed to allocate memory, reason:%s", strerror(errno));
@@ -243,10 +243,9 @@ SCacheObj *taosCacheInitWithCb(int64_t refreshTime, void (*freeCb)(void *data))
   }
   
   // set free cache node callback function for hash table
-  // taosHashSetFreecb(pCacheObj->pHashTable, taosFreeNode);
-  
-  pCacheObj->freeFp = freeCb;
-  pCacheObj->refreshTime = refreshTime * 1000;
+  pCacheObj->freeFp = fn;
+  pCacheObj->refreshTime = refreshTimeInSeconds * 1000;
+  pCacheObj->extendLifespan = extendLifespan;
 
   if (__cache_lock_init(pCacheObj) != 0) {
     taosHashCleanup(pCacheObj->pHashTable);
@@ -256,7 +255,7 @@ SCacheObj *taosCacheInitWithCb(int64_t refreshTime, void (*freeCb)(void *data))
     return NULL;
   }
 
-  pthread_attr_t thattr;
+  pthread_attr_t thattr = {{0}};
   pthread_attr_init(&thattr);
   pthread_attr_setdetachstate(&thattr, PTHREAD_CREATE_JOINABLE);
 
@@ -266,19 +265,17 @@ SCacheObj *taosCacheInitWithCb(int64_t refreshTime, void (*freeCb)(void *data))
   return pCacheObj;
 }
 
-SCacheObj *taosCacheInit(int64_t refreshTime) {
-  return taosCacheInitWithCb(refreshTime, NULL);
+SCacheObj *taosCacheInit(int32_t keyType, int64_t refreshTimeInSeconds, bool extendLifespan, __cache_freeres_fn_t fn) {
+  return taosCacheInitWithCb(keyType, refreshTimeInSeconds, extendLifespan, fn);
 }
 
-void *taosCachePut(SCacheObj *pCacheObj, const char *key, const void *pData, size_t dataSize, int duration) {
+void *taosCachePut(SCacheObj *pCacheObj, const void *key, size_t keyLen, const void *pData, size_t dataSize, int duration) {
   SCacheDataNode *pNode;
   
   if (pCacheObj == NULL || pCacheObj->pHashTable == NULL) {
     return NULL;
   }
-  
-  size_t keyLen = strlen(key);
-  
+
   __cache_wr_lock(pCacheObj);
   SCacheDataNode **pt = (SCacheDataNode **)taosHashGet(pCacheObj->pHashTable, key, keyLen);
   SCacheDataNode * pOld = (pt != NULL) ? (*pt) : NULL;
@@ -288,14 +285,14 @@ void *taosCachePut(SCacheObj *pCacheObj, const char *key, const void *pData, siz
     if (NULL != pNode) {
       pCacheObj->totalSize += pNode->size;
       
-      uDebug("key:%s, %p added into cache, added:%" PRIu64 ", expire:%" PRIu64 ", total:%" PRId64 ", size:%" PRId64 " bytes",
-             key, pNode, pNode->addedTime, pNode->expiredTime, pCacheObj->totalSize, dataSize);
+      uDebug("key:%p, %p added into cache, added:%" PRIu64 ", expire:%" PRIu64 ", total:%" PRId64 ", size:%" PRId64 " bytes",
+             key, pNode, pNode->addedTime, (pNode->lifespan * pNode->extendFactor + pNode->addedTime), pCacheObj->totalSize, dataSize);
     } else {
-      uError("key:%s, failed to added into cache, out of memory", key);
+      uError("key:%p, failed to added into cache, out of memory", key);
     }
   } else {  // old data exists, update the node
     pNode = taosUpdateCacheImpl(pCacheObj, pOld, key, keyLen, pData, dataSize, duration * 1000L);
-    uDebug("key:%s, %p exist in cache, updated", key, pNode);
+    uDebug("key:%p, %p exist in cache, updated", key, pNode);
   }
   
   __cache_unlock(pCacheObj);
@@ -303,57 +300,65 @@ void *taosCachePut(SCacheObj *pCacheObj, const char *key, const void *pData, siz
   return (pNode != NULL) ? pNode->data : NULL;
 }
 
-void *taosCacheAcquireByName(SCacheObj *pCacheObj, const char *key) {
+void *taosCacheAcquireByKey(SCacheObj *pCacheObj, const void *key, size_t keyLen) {
   if (pCacheObj == NULL || taosHashGetSize(pCacheObj->pHashTable) == 0) {
     return NULL;
   }
-  
-  uint32_t keyLen = (uint32_t)strlen(key);
-  
+
   __cache_rd_lock(pCacheObj);
   
   SCacheDataNode **ptNode = (SCacheDataNode **)taosHashGet(pCacheObj->pHashTable, key, keyLen);
+
+  int32_t ref = 0;
   if (ptNode != NULL) {
-    T_REF_INC(*ptNode);
+    ref = T_REF_INC(*ptNode);
+
+    // if the remained life span is less then the (*ptNode)->lifeSpan, add up one lifespan
+    if (pCacheObj->extendLifespan) {
+      int64_t now = taosGetTimestampMs();
+
+      if ((now - (*ptNode)->addedTime) < (*ptNode)->lifespan * (*ptNode)->extendFactor) {
+        (*ptNode)->extendFactor += 1;
+        uDebug("key:%p extend life time to %"PRId64, key, (*ptNode)->lifespan * (*ptNode)->extendFactor + (*ptNode)->addedTime);
+      }
+    }
   }
-  
   __cache_unlock(pCacheObj);
   
   if (ptNode != NULL) {
     atomic_add_fetch_32(&pCacheObj->statistics.hitCount, 1);
-    uDebug("key:%s, is retrieved from cache, %p refcnt:%d", key, (*ptNode), T_REF_VAL_GET(*ptNode));
+    uDebug("key:%p, is retrieved from cache, %p refcnt:%d", key, (*ptNode), ref);
   } else {
     atomic_add_fetch_32(&pCacheObj->statistics.missCount, 1);
-    uDebug("key:%s, not in cache, retrieved failed", key);
+    uDebug("key:%p, not in cache, retrieved failed", key);
   }
   
   atomic_add_fetch_32(&pCacheObj->statistics.totalAccess, 1);
   return (ptNode != NULL) ? (*ptNode)->data : NULL;
 }
 
-void* taosCacheUpdateExpireTimeByName(SCacheObj *pCacheObj, const char *key, uint64_t expireTime) {
+void* taosCacheUpdateExpireTimeByName(SCacheObj *pCacheObj, const char *key, size_t keyLen, uint64_t expireTime) {
   if (pCacheObj == NULL || taosHashGetSize(pCacheObj->pHashTable) == 0) {
     return NULL;
   }
-  
-  uint32_t keyLen = (uint32_t)strlen(key);
-  
+
   __cache_rd_lock(pCacheObj);
   
   SCacheDataNode **ptNode = (SCacheDataNode **)taosHashGet(pCacheObj->pHashTable, key, keyLen);
   if (ptNode != NULL) {
      T_REF_INC(*ptNode);
-    (*ptNode)->expiredTime = expireTime;
+    (*ptNode)->extendFactor += 1;
+//    (*ptNode)->lifespan = expireTime;
   }
   
   __cache_unlock(pCacheObj);
   
   if (ptNode != NULL) {
     atomic_add_fetch_32(&pCacheObj->statistics.hitCount, 1);
-    uDebug("key:%s, expireTime is updated in cache, %p refcnt:%d", key, (*ptNode), T_REF_VAL_GET(*ptNode));
+    uDebug("key:%p, expireTime is updated in cache, %p refcnt:%d", key, (*ptNode), T_REF_VAL_GET(*ptNode));
   } else {
     atomic_add_fetch_32(&pCacheObj->statistics.missCount, 1);
-    uDebug("key:%s, not in cache, retrieved failed", key);
+    uDebug("key:%p, not in cache, retrieved failed", key);
   }
   
   atomic_add_fetch_32(&pCacheObj->statistics.totalAccess, 1);
@@ -373,7 +378,17 @@ void *taosCacheAcquireByData(SCacheObj *pCacheObj, void *data) {
   
   int32_t ref = T_REF_INC(ptNode);
   uDebug("%p acquired by data in cache, refcnt:%d", ptNode, ref)
-  
+
+  // if the remained life span is less then the (*ptNode)->lifeSpan, add up one lifespan
+  if (pCacheObj->extendLifespan) {
+    int64_t now = taosGetTimestampMs();
+
+    if ((now - ptNode->addedTime) < ptNode->lifespan * ptNode->extendFactor) {
+      ptNode->extendFactor += 1;
+      uDebug("key:%p extend life time to %"PRId64, ptNode, ptNode->lifespan * ptNode->extendFactor + ptNode->addedTime);
+    }
+  }
+
   // the data if referenced by at least one object, so the reference count must be greater than the value of 2.
   assert(ref >= 2);
   return data;
@@ -408,21 +423,27 @@ void taosCacheRelease(SCacheObj *pCacheObj, void **data, bool _remove) {
   size_t offset = offsetof(SCacheDataNode, data);
   
   SCacheDataNode *pNode = (SCacheDataNode *)((char *)(*data) - offset);
-  
   if (pNode->signature != (uint64_t)pNode) {
-    uError("%p release invalid cache data", pNode);
+    uError("key:%p, release invalid cache data", pNode);
     return;
   }
   
   *data = NULL;
-  int32_t ref = T_REF_DEC(pNode);
-  uDebug("key:%s, is released, %p refcnt:%d", pNode->key, pNode, ref);
+  int16_t ref = T_REF_DEC(pNode);
+  uDebug("%p data released, refcnt:%d", pNode, ref);
   
-  if (_remove) {
+  if (_remove && (!pNode->inTrashCan)) {
     __cache_wr_lock(pCacheObj);
-    // pNode may be released immediately by other thread after the reference count of pNode is set to 0,
-    // So we need to lock it in the first place.
-    taosCacheMoveToTrash(pCacheObj, pNode);
+
+    if (T_REF_VAL_GET(pNode) == 0) {
+      // remove directly, if not referenced by other users
+      taosCacheReleaseNode(pCacheObj, pNode);
+    } else {
+      // pNode may be released immediately by other thread after the reference count of pNode is set to 0,
+      // So we need to lock it in the first place.
+      taosCacheMoveToTrash(pCacheObj, pNode);
+    }
+
     __cache_unlock(pCacheObj);
   }
 }
@@ -473,11 +494,11 @@ SCacheDataNode *taosCreateCacheNode(const char *key, size_t keyLen, const char *
 
   memcpy(pNewNode->key, key, keyLen);
 
-  pNewNode->addedTime = (uint64_t)taosGetTimestampMs();
-  pNewNode->expiredTime = pNewNode->addedTime + duration;
-
-  pNewNode->signature = (uint64_t)pNewNode;
-  pNewNode->size = (uint32_t)totalSize;
+  pNewNode->addedTime    = (uint64_t)taosGetTimestampMs();
+  pNewNode->lifespan     = duration;
+  pNewNode->extendFactor = 1;
+  pNewNode->signature    = (uint64_t)pNewNode;
+  pNewNode->size         = (uint32_t)totalSize;
 
   return pNewNode;
 }
@@ -501,7 +522,7 @@ void taosAddToTrash(SCacheObj *pCacheObj, SCacheDataNode *pNode) {
   pNode->inTrashCan = true;
   pCacheObj->numOfElemsInTrash++;
 
-  uDebug("key:%s, %p move to trash, numOfElem in trash:%d", pNode->key, pNode, pCacheObj->numOfElemsInTrash);
+  uDebug("key:%p, %p move to trash, numOfElem in trash:%d", pNode->key, pNode, pCacheObj->numOfElemsInTrash);
 }
 
 void taosRemoveFromTrashCan(SCacheObj *pCacheObj, STrashElem *pElem) {
@@ -522,7 +543,11 @@ void taosRemoveFromTrashCan(SCacheObj *pCacheObj, STrashElem *pElem) {
   }
 
   pElem->pData->signature = 0;
-  if (pCacheObj->freeFp) pCacheObj->freeFp(pElem->pData->data);
+  if (pCacheObj->freeFp) {
+    pCacheObj->freeFp(pElem->pData->data);
+  }
+
+  uError("-------------------free obj:%p", pElem->pData);
   free(pElem->pData);
   free(pElem);
 }
@@ -549,7 +574,7 @@ void taosTrashCanEmpty(SCacheObj *pCacheObj, bool force) {
     }
 
     if (force || (T_REF_VAL_GET(pElem->pData) == 0)) {
-      uDebug("key:%s, %p removed from trash. numOfElem in trash:%d", pElem->pData->key, pElem->pData,
+      uDebug("key:%p, %p removed from trash. numOfElem in trash:%d", pElem->pData->key, pElem->pData,
              pCacheObj->numOfElemsInTrash - 1);
       STrashElem *p = pElem;
 
@@ -573,7 +598,7 @@ void doCleanupDataCache(SCacheObj *pCacheObj) {
     if (T_REF_VAL_GET(pNode) <= 0) {
       taosCacheReleaseNode(pCacheObj, pNode);
     } else {
-      uDebug("key:%s, will not remove from cache, refcnt:%d", pNode->key, T_REF_VAL_GET(pNode));  
+      uDebug("key:%p, will not remove from cache, refcnt:%d", pNode->key, T_REF_VAL_GET(pNode));
     }
   }
   taosHashDestroyIter(pIter);
@@ -613,27 +638,32 @@ void* taosCacheRefresh(void *handle) {
 
     // reset the count value
     count = 0;
-    size_t num = taosHashGetSize(pCacheObj->pHashTable);
-    if (num == 0) {
+    size_t elemInHash = taosHashGetSize(pCacheObj->pHashTable);
+    if (elemInHash + pCacheObj->numOfElemsInTrash == 0) {
       continue;
     }
 
-    uint64_t expiredTime = taosGetTimestampMs();
     pCacheObj->statistics.refreshCount++;
 
-    SHashMutableIterator *pIter = taosHashCreateIter(pCacheObj->pHashTable);
+    // refresh data in hash table
+    if (elemInHash > 0) {
+      int64_t expiredTime = taosGetTimestampMs();
 
-    __cache_wr_lock(pCacheObj);
-    while (taosHashIterNext(pIter)) {
-      SCacheDataNode *pNode = *(SCacheDataNode **)taosHashIterGet(pIter);
-      if (pNode->expiredTime <= expiredTime && T_REF_VAL_GET(pNode) <= 0) {
-        taosCacheReleaseNode(pCacheObj, pNode);
+      SHashMutableIterator *pIter = taosHashCreateIter(pCacheObj->pHashTable);
+
+      __cache_wr_lock(pCacheObj);
+      while (taosHashIterNext(pIter)) {
+        SCacheDataNode *pNode = *(SCacheDataNode **)taosHashIterGet(pIter);
+        if ((pNode->addedTime + pNode->lifespan * pNode->extendFactor) <= expiredTime && T_REF_VAL_GET(pNode) <= 0) {
+          taosCacheReleaseNode(pCacheObj, pNode);
+        }
       }
-    }
 
-    __cache_unlock(pCacheObj);
+      __cache_unlock(pCacheObj);
+
+      taosHashDestroyIter(pIter);
+    }
 
-    taosHashDestroyIter(pIter);
     taosTrashCanEmpty(pCacheObj, false);
   }
 
diff --git a/src/util/tests/cacheTest.cpp b/src/util/tests/cacheTest.cpp
index 5762d5700bbb1945490846dcfaaf0e12f0fbaa27..43ac689ff47745cb2884455e39581f19586c7e7e 100644
--- a/src/util/tests/cacheTest.cpp
+++ b/src/util/tests/cacheTest.cpp
@@ -19,12 +19,12 @@ int32_t tsMaxMeterConnections = 200;
 // test cache
 TEST(testCase, client_cache_test) {
   const int32_t REFRESH_TIME_IN_SEC = 2;
-  SCacheObj* tscCacheHandle = taosCacheInit(REFRESH_TIME_IN_SEC);
+  SCacheObj* tscCacheHandle = taosCacheInit(TSDB_DATA_TYPE_BINARY, REFRESH_TIME_IN_SEC, 0, NULL);
 
   const char* key1 = "test1";
   char data1[] = "test11";
 
-  char* cachedObj = (char*) taosCachePut(tscCacheHandle, key1, data1, strlen(data1)+1, 1);
+  char* cachedObj = (char*) taosCachePut(tscCacheHandle, key1, strlen(key1), data1, strlen(data1)+1, 1);
   sleep(REFRESH_TIME_IN_SEC+1);
 
   printf("obj is still valid: %s\n", cachedObj);
@@ -33,7 +33,7 @@ TEST(testCase, client_cache_test) {
   taosCacheRelease(tscCacheHandle, (void**) &cachedObj, false);
 
   /* the object is cleared by cache clean operation */
-  cachedObj = (char*) taosCachePut(tscCacheHandle, key1, data2, strlen(data2)+1, 20);
+  cachedObj = (char*) taosCachePut(tscCacheHandle, key1, strlen(key1), data2, strlen(data2)+1, 20);
   printf("after updated: %s\n", cachedObj);
 
   printf("start to remove data from cache\n");
@@ -43,32 +43,32 @@ TEST(testCase, client_cache_test) {
   const char* key3 = "test2";
   const char* data3 = "kkkkkkk";
 
-  char* cachedObj2 = (char*) taosCachePut(tscCacheHandle, key3, data3, strlen(data3) + 1, 1);
+  char* cachedObj2 = (char*) taosCachePut(tscCacheHandle, key3, strlen(key3), data3, strlen(data3) + 1, 1);
   printf("%s\n", cachedObj2);
 
   taosCacheRelease(tscCacheHandle, (void**) &cachedObj2, false);
 
   sleep(3);
-  char* d = (char*) taosCacheAcquireByName(tscCacheHandle, key3);
+  char* d = (char*) taosCacheAcquireByKey(tscCacheHandle, key3, strlen(key3));
 //    assert(d == NULL);
 
   char key5[] = "test5";
   char data5[] = "data5kkkkk";
-  cachedObj2 = (char*) taosCachePut(tscCacheHandle, key5, data5, strlen(data5) + 1, 20);
+  cachedObj2 = (char*) taosCachePut(tscCacheHandle, key5, strlen(key5), data5, strlen(data5) + 1, 20);
 
   const char* data6= "new Data after updated";
   taosCacheRelease(tscCacheHandle, (void**) &cachedObj2, false);
 
-  cachedObj2 = (char*) taosCachePut(tscCacheHandle, key5, data6, strlen(data6) + 1, 20);
+  cachedObj2 = (char*) taosCachePut(tscCacheHandle, key5, strlen(key5), data6, strlen(data6) + 1, 20);
   printf("%s\n", cachedObj2);
 
   taosCacheRelease(tscCacheHandle, (void**) &cachedObj2, true);
 
   const char* data7 = "add call update procedure";
-  cachedObj2 = (char*) taosCachePut(tscCacheHandle, key5, data7, strlen(data7) + 1, 20);
+  cachedObj2 = (char*) taosCachePut(tscCacheHandle, key5, strlen(key5), data7, strlen(data7) + 1, 20);
   printf("%s\n=======================================\n\n", cachedObj2);
 
-  char* cc = (char*) taosCacheAcquireByName(tscCacheHandle, key5);
+  char* cc = (char*) taosCacheAcquireByKey(tscCacheHandle, key5, strlen(key5));
 
   taosCacheRelease(tscCacheHandle, (void**) &cachedObj2, true);
   taosCacheRelease(tscCacheHandle, (void**) &cc, false);
@@ -76,7 +76,7 @@ TEST(testCase, client_cache_test) {
   const char* data8 = "ttft";
   const char* key6 = "key6";
 
-  char* ft = (char*) taosCachePut(tscCacheHandle, key6, data8, strlen(data8), 20);
+  char* ft = (char*) taosCachePut(tscCacheHandle, key6, strlen(key6), data8, strlen(data8), 20);
   taosCacheRelease(tscCacheHandle, (void**) &ft, false);
 
   /**
@@ -85,7 +85,7 @@ TEST(testCase, client_cache_test) {
   uint64_t startTime = taosGetTimestampUs();
   printf("Cache Performance Test\nstart time:%" PRIu64 "\n", startTime);
   for(int32_t i=0; i<1000; ++i) {
-    char* dd = (char*) taosCacheAcquireByName(tscCacheHandle, key6);
+    char* dd = (char*) taosCacheAcquireByKey(tscCacheHandle, key6, strlen(key6));
     if (dd != NULL) {
 //      printf("get the data\n");
     } else {
@@ -105,7 +105,7 @@ TEST(testCase, client_cache_test) {
 
 TEST(testCase, cache_resize_test) {
   const int32_t REFRESH_TIME_IN_SEC = 2;
-  auto* pCache = taosCacheInit(REFRESH_TIME_IN_SEC);
+  auto* pCache = taosCacheInit(TSDB_DATA_TYPE_BINARY, REFRESH_TIME_IN_SEC, false, NULL);
 
   char key[256] = {0};
   char data[1024] = "abcdefghijk";
@@ -116,7 +116,7 @@ TEST(testCase, cache_resize_test) {
 
   for(int32_t i = 0; i < num; ++i) {
     int32_t len = sprintf(key, "abc_%7d", i);
-    taosCachePut(pCache, key, data, len, 3600);
+    taosCachePut(pCache, key, strlen(key), data, len, 3600);
   }
   uint64_t endTime = taosGetTimestampUs();
 
@@ -125,7 +125,7 @@ TEST(testCase, cache_resize_test) {
   startTime = taosGetTimestampUs();
   for(int32_t i = 0; i < num; ++i) {
     int32_t len = sprintf(key, "abc_%7d", i);
-    void* k = taosCacheAcquireByName(pCache, key);
+    void* k = taosCacheAcquireByKey(pCache, key, len);
     assert(k != 0);
   }
   endTime = taosGetTimestampUs();
diff --git a/src/vnode/inc/vnodeInt.h b/src/vnode/inc/vnodeInt.h
index e428eae688505f8930e0f981cb02326fea981752..76e53f3962ed55cf1a3aee875d10b83b22ac9c37 100644
--- a/src/vnode/inc/vnodeInt.h
+++ b/src/vnode/inc/vnodeInt.h
@@ -53,6 +53,7 @@ typedef struct {
   STsdbCfg     tsdbCfg;
   SSyncCfg     syncCfg;
   SWalCfg      walCfg;
+  void        *qHandlePool;  // query handle pool
   char        *rootDir;
   char         db[TSDB_DB_NAME_LEN];
 } SVnodeObj;
diff --git a/src/vnode/src/vnodeMain.c b/src/vnode/src/vnodeMain.c
index f71f6adefbe3923aa877bdbc0ad3a93ffb5a8cc8..192998c8a6060a58ed91075b3ab9978592a2d2f0 100644
--- a/src/vnode/src/vnodeMain.c
+++ b/src/vnode/src/vnodeMain.c
@@ -15,19 +15,22 @@
 
 #define _DEFAULT_SOURCE
 #include "os.h"
+
+#include "tcache.h"
+#include "cJSON.h"
+#include "dnode.h"
 #include "hash.h"
 #include "taoserror.h"
 #include "taosmsg.h"
-#include "tutil.h"
+#include "tglobal.h"
 #include "trpc.h"
 #include "tsdb.h"
 #include "ttime.h"
 #include "ttimer.h"
-#include "cJSON.h"
-#include "tglobal.h"
-#include "dnode.h"
+#include "tutil.h"
 #include "vnode.h"
 #include "vnodeInt.h"
+#include "query.h"
 
 #define TSDB_VNODE_VERSION_CONTENT_LEN 31
 
@@ -43,6 +46,7 @@ static uint32_t vnodeGetFileInfo(void *ahandle, char *name, uint32_t *index, uin
 static int      vnodeGetWalInfo(void *ahandle, char *name, uint32_t *index);
 static void     vnodeNotifyRole(void *ahandle, int8_t role);
 static void     vnodeNotifyFileSynced(void *ahandle, uint64_t fversion);
+static void     vnodeFreeqHandle(void* phandle);
 
 static pthread_once_t  vnodeModuleInit = PTHREAD_ONCE_INIT;
 
@@ -279,6 +283,9 @@ int32_t vnodeOpen(int32_t vnode, char *rootDir) {
   if (pVnode->role == TAOS_SYNC_ROLE_MASTER)
     cqStart(pVnode->cq);
 
+  const int32_t REFRESH_HANDLE_INTERVAL = 2; // every 2 seconds, rfresh handle pool
+  pVnode->qHandlePool = taosCacheInit(TSDB_DATA_TYPE_BIGINT, REFRESH_HANDLE_INTERVAL, true,  vnodeFreeqHandle);
+
   pVnode->events = NULL;
   pVnode->status = TAOS_VN_STATUS_READY;
   vDebug("vgId:%d, vnode is opened in %s, pVnode:%p", pVnode->vgId, rootDir, pVnode);
@@ -848,12 +855,12 @@ static int32_t vnodeReadVersion(SVnodeObj *pVnode) {
     goto PARSE_OVER;
   }
 
-  cJSON *version = cJSON_GetObjectItem(root, "version");
-  if (!version || version->type != cJSON_Number) {
+  cJSON *ver = cJSON_GetObjectItem(root, "version");
+  if (!ver || ver->type != cJSON_Number) {
     vError("vgId:%d, failed to read vnode version, version not found", pVnode->vgId);
     goto PARSE_OVER;
   }
-  pVnode->version = version->valueint;
+  pVnode->version = ver->valueint;
 
   terrno = TSDB_CODE_SUCCESS;
   vInfo("vgId:%d, read vnode version successfully, version:%" PRId64, pVnode->vgId, pVnode->version);
@@ -864,3 +871,12 @@ PARSE_OVER:
   if(fp) fclose(fp);
   return terrno;
 }
+
+void vnodeFreeqHandle(void *qHandle) {
+  void** handle = qHandle;
+  if (handle == NULL || *handle == NULL) {
+    return;
+  }
+
+  qKillQuery(*handle);
+}
\ No newline at end of file
diff --git a/src/vnode/src/vnodeRead.c b/src/vnode/src/vnodeRead.c
index 0c08c77e329828396e7c6760814f15e247c8977d..52adffff7e8c3fc3dc611d984ec90cafb813dbd1 100644
--- a/src/vnode/src/vnodeRead.c
+++ b/src/vnode/src/vnodeRead.c
@@ -15,20 +15,21 @@
 
 #define _DEFAULT_SOURCE
 #include "os.h"
-#include "taosmsg.h"
+
+#include "tglobal.h"
 #include "taoserror.h"
-#include "tqueue.h"
+#include "taosmsg.h"
+#include "tcache.h"
+#include "query.h"
 #include "trpc.h"
 #include "tsdb.h"
-#include "twal.h"
-#include "tdataformat.h"
 #include "vnode.h"
 #include "vnodeInt.h"
-#include "query.h"
 
 static int32_t (*vnodeProcessReadMsgFp[TSDB_MSG_TYPE_MAX])(SVnodeObj *pVnode, SReadMsg *pReadMsg);
 static int32_t  vnodeProcessQueryMsg(SVnodeObj *pVnode, SReadMsg *pReadMsg);
 static int32_t  vnodeProcessFetchMsg(SVnodeObj *pVnode, SReadMsg *pReadMsg);
+static int32_t  vnodeNotifyCurrentQhandle(void* handle, void* qhandle, int32_t vgId);
 
 void vnodeInitReadFp(void) {
   vnodeProcessReadMsgFp[TSDB_MSG_TYPE_QUERY] = vnodeProcessQueryMsg;
@@ -58,19 +59,6 @@ int32_t vnodeProcessRead(void *param, SReadMsg *pReadMsg) {
   return (*vnodeProcessReadMsgFp[msgType])(pVnode, pReadMsg);
 }
 
-// notify connection(handle) that current qhandle is created, if current connection from
-// client is broken, the query needs to be killed immediately.
-static int32_t vnodeNotifyCurrentQhandle(void* handle, void* qhandle, int32_t vgId) {
-  SRetrieveTableMsg* killQueryMsg = rpcMallocCont(sizeof(SRetrieveTableMsg));
-  killQueryMsg->qhandle = htobe64((uint64_t) qhandle);
-  killQueryMsg->free = htons(1);
-  killQueryMsg->header.vgId = htonl(vgId);
-  killQueryMsg->header.contLen = htonl(sizeof(SRetrieveTableMsg));
-
-  vDebug("QInfo:%p register qhandle to connect:%p", qhandle, handle);
-  return rpcReportProgress(handle, (char*) killQueryMsg, sizeof(SRetrieveTableMsg));
-}
-
 static int32_t vnodeProcessQueryMsg(SVnodeObj *pVnode, SReadMsg *pReadMsg) {
   void *   pCont = pReadMsg->pCont;
   int32_t  contLen = pReadMsg->contLen;
@@ -88,18 +76,25 @@ static int32_t vnodeProcessQueryMsg(SVnodeObj *pVnode, SReadMsg *pReadMsg) {
     vWarn("QInfo:%p connection %p broken, kill query", (void*)killQueryMsg->qhandle, pReadMsg->rpcMsg.handle);
     assert(pReadMsg->rpcMsg.contLen > 0 && killQueryMsg->free == 1);
 
-    // this message arrived here by means of the query message, so release the vnode is necessary
-    qKillQuery((qinfo_t) killQueryMsg->qhandle, vnodeRelease, pVnode);
-    vnodeRelease(pVnode);
+    // this message arrived here by means of the *query* message, so release the vnode is necessary
+    void** qhandle = taosCacheAcquireByKey(pVnode->qHandlePool, (void*) &killQueryMsg->qhandle, sizeof(killQueryMsg->qhandle));
+    if (qhandle == NULL || *qhandle == NULL) {  // todo handle invalid qhandle error
 
+    } else {
+//      qKillQuery((qinfo_t) killQueryMsg->qhandle);
+      taosCacheRelease(pVnode->qHandlePool, (void**) &qhandle, true);
+    }
+
+    vnodeRelease(pVnode);
     return TSDB_CODE_TSC_QUERY_CANCELLED; // todo change the error code
   }
 
   int32_t code = TSDB_CODE_SUCCESS;
   qinfo_t pQInfo = NULL;
+  void**  handle = NULL;
 
   if (contLen != 0) {
-    code = qCreateQueryInfo(pVnode->tsdb, pVnode->vgId, pQueryTableMsg, &pQInfo);
+    code = qCreateQueryInfo(pVnode->tsdb, pVnode->vgId, pQueryTableMsg, pVnode, vnodeRelease, &pQInfo);
 
     SQueryTableRsp *pRsp = (SQueryTableRsp *) rpcMallocCont(sizeof(SQueryTableRsp));
     pRsp->qhandle = htobe64((uint64_t) (pQInfo));
@@ -116,13 +111,15 @@ static int32_t vnodeProcessQueryMsg(SVnodeObj *pVnode, SReadMsg *pReadMsg) {
         pRsp->code = TSDB_CODE_RPC_NETWORK_UNAVAIL;
 
         // NOTE: there two refcount, needs to kill twice, todo refactor
-        qKillQuery(pQInfo, vnodeRelease, pVnode);
-        qKillQuery(pQInfo, vnodeRelease, pVnode);
+        // query has not been put into qhandle pool, kill it directly.
+        qKillQuery(pQInfo);
+        qKillQuery(pQInfo);
 
         return pRsp->code;
       }
 
-      vTrace("vgId:%d, QInfo:%p, dnode query msg disposed", pVnode->vgId, pQInfo);
+      handle = taosCachePut(pVnode->qHandlePool, pQInfo, sizeof(pQInfo), &pQInfo, sizeof(pQInfo), tsShellActivityTimer * 2);
+      assert(*handle == pQInfo);
     } else {
       assert(pQInfo == NULL);
       vnodeRelease(pVnode);
@@ -138,6 +135,7 @@ static int32_t vnodeProcessQueryMsg(SVnodeObj *pVnode, SReadMsg *pReadMsg) {
 
   if (pQInfo != NULL) {
     qTableQuery(pQInfo, vnodeRelease, pVnode); // do execute query
+    taosCacheRelease(pVnode->qHandlePool, (void**) &handle, false);
   }
 
   return code;
@@ -152,10 +150,18 @@ static int32_t vnodeProcessFetchMsg(SVnodeObj *pVnode, SReadMsg *pReadMsg) {
   pRetrieve->free = htons(pRetrieve->free);
 
   memset(pRet, 0, sizeof(SRspRet));
+  int32_t ret = 0;
+
+  void** handle = taosCacheAcquireByKey(pVnode->qHandlePool, &pQInfo, sizeof(pQInfo));
+  if (handle == NULL || *handle != pQInfo) {
+    ret = TSDB_CODE_QRY_INVALID_QHANDLE;
+  }
 
   if (pRetrieve->free == 1) {
     vDebug("vgId:%d, QInfo:%p, retrieve msg received to kill query and free qhandle", pVnode->vgId, pQInfo);
-    int32_t ret = qKillQuery(pQInfo, vnodeRelease, pVnode);
+
+    taosCacheRelease(pVnode->qHandlePool, handle, true);
+//    int32_t ret = qKillQuery(pQInfo);
 
     pRet->rsp = (SRetrieveTableRsp *)rpcMallocCont(sizeof(SRetrieveTableRsp));
     pRet->len = sizeof(SRetrieveTableRsp);
@@ -184,10 +190,24 @@ static int32_t vnodeProcessFetchMsg(SVnodeObj *pVnode, SReadMsg *pReadMsg) {
       pRet->qhandle = pQInfo;
       code = TSDB_CODE_VND_ACTION_NEED_REPROCESSED;
     } else { // no further execution invoked, release the ref to vnode
-      qDestroyQueryInfo(pQInfo, vnodeRelease, pVnode);
+      taosCacheRelease(pVnode->qHandlePool, (void**) &handle, true);
+//      qDestroyQueryInfo(pQInfo);
     }
   }
   
   vDebug("vgId:%d, QInfo:%p, retrieve msg is disposed", pVnode->vgId, pQInfo);
   return code;
 }
+
+// notify connection(handle) that current qhandle is created, if current connection from
+// client is broken, the query needs to be killed immediately.
+int32_t vnodeNotifyCurrentQhandle(void* handle, void* qhandle, int32_t vgId) {
+  SRetrieveTableMsg* killQueryMsg = rpcMallocCont(sizeof(SRetrieveTableMsg));
+  killQueryMsg->qhandle = htobe64((uint64_t) qhandle);
+  killQueryMsg->free = htons(1);
+  killQueryMsg->header.vgId = htonl(vgId);
+  killQueryMsg->header.contLen = htonl(sizeof(SRetrieveTableMsg));
+
+  vDebug("QInfo:%p register qhandle to connect:%p", qhandle, handle);
+  return rpcReportProgress(handle, (char*) killQueryMsg, sizeof(SRetrieveTableMsg));
+}
\ No newline at end of file