diff --git a/src/client/src/tscSystem.c b/src/client/src/tscSystem.c
index ea4cf12f9de399b7ff934ff189fa600930bb6374..0ce767926e61300d0bc3c048985b7175f6ba99ab 100644
--- a/src/client/src/tscSystem.c
+++ b/src/client/src/tscSystem.c
@@ -171,17 +171,51 @@ void taos_init_imp() {
   if(0 == tscEmbedded){
     taosTmrReset(tscCheckDiskUsage, 10, NULL, tscTmr, &tscCheckDiskUsageTmr);      
   }
+  
   int64_t refreshTime = tsMetricMetaKeepTimer < tsMeterMetaKeepTimer ? tsMetricMetaKeepTimer : tsMeterMetaKeepTimer;
   refreshTime = refreshTime > 2 ? 2 : refreshTime;
   refreshTime = refreshTime < 1 ? 1 : refreshTime;
 
-  if (tscCacheHandle == NULL) tscCacheHandle = taosCacheInit(tscTmr, refreshTime);
+  if (tscCacheHandle == NULL) {
+    tscCacheHandle = taosCacheInit(tscTmr, refreshTime);
+  }
 
   tscTrace("client is initialized successfully");
 }
 
 void taos_init() { pthread_once(&tscinit, taos_init_imp); }
 
+void taos_cleanup() {
+  if (tscCacheHandle != NULL) {
+    taosCacheCleanup(tscCacheHandle);
+//    tscCacheHandle = NULL;
+  }
+  
+  if (tscQhandle != NULL) {
+    taosCleanUpScheduler(tscQhandle);
+    tscQhandle = NULL;
+  }
+  
+  taosCloseLogger();
+  
+  if (pVnodeConn != NULL) {
+    rpcClose(pVnodeConn);
+    pVnodeConn = NULL;
+  }
+  
+  if (pTscMgmtConn != NULL) {
+    rpcClose(pTscMgmtConn);
+    pTscMgmtConn = NULL;
+  }
+  
+  if (tsGlobalConfig != NULL) {
+    tfree(tsGlobalConfig);
+  }
+  
+  taosMsleep(1000);
+  taosTmrCleanUp(tscTmr);
+}
+
 static int taos_options_imp(TSDB_OPTION option, const char *pStr) {
   SGlobalConfig *cfg = NULL;
 
diff --git a/src/inc/taos.h b/src/inc/taos.h
index 4a815d8ee53cef379454965b38330c356186fdd4..419685bd077a1df862e458be3b7b75ec645d6cd1 100644
--- a/src/inc/taos.h
+++ b/src/inc/taos.h
@@ -52,6 +52,7 @@ typedef struct taosField {
 #endif
 
 DLL_EXPORT void  taos_init();
+DLL_EXPORT void  taos_cleanup();
 DLL_EXPORT int   taos_options(TSDB_OPTION option, const void *arg, ...);
 DLL_EXPORT TAOS *taos_connect(const char *ip, const char *user, const char *pass, const char *db, uint16_t port);
 DLL_EXPORT void  taos_close(TAOS *taos);
diff --git a/src/kit/shell/inc/shell.h b/src/kit/shell/inc/shell.h
index 0315aa1b277a460ebce32107a9a76d2fc24f34a8..fcc5e0a87c715a3096ce160b2df2551d808bc910 100644
--- a/src/kit/shell/inc/shell.h
+++ b/src/kit/shell/inc/shell.h
@@ -71,7 +71,7 @@ extern void* shellLoopQuery(void* arg);
 extern void taos_error(TAOS* con);
 extern int regex_match(const char* s, const char* reg, int cflags);
 void shellReadCommand(TAOS* con, char command[]);
-void shellRunCommand(TAOS* con, char* command);
+int32_t shellRunCommand(TAOS* con, char* command);
 void shellRunCommandOnServer(TAOS* con, char command[]);
 void read_history();
 void write_history();
diff --git a/src/kit/shell/src/shellEngine.c b/src/kit/shell/src/shellEngine.c
index e291fdc551c5538f5391481065393935d78c65c6..69d0aa6a400a921a278698e7df8ef6340ab37f24 100644
--- a/src/kit/shell/src/shellEngine.c
+++ b/src/kit/shell/src/shellEngine.c
@@ -166,10 +166,10 @@ void shellReplaceCtrlChar(char *str) {
   *pstr = '\0';
 }
 
-void shellRunCommand(TAOS *con, char *command) {
+int32_t shellRunCommand(TAOS *con, char *command) {
   /* If command is empty just return */
   if (regex_match(command, "^[ \t;]*$", REG_EXTENDED)) {
-    return;
+    return 0;
   }
 
   /* Update the history vector. */
@@ -193,11 +193,11 @@ void shellRunCommand(TAOS *con, char *command) {
   if (regex_match(command, "^[ \t]*(quit|q|exit)[ \t;]*$", REG_EXTENDED | REG_ICASE)) {
     taos_close(con);
     write_history();
-    exitShell();
+    return -1;
   } else if (regex_match(command, "^[\t ]*clear[ \t;]*$", REG_EXTENDED | REG_ICASE)) {
     // If clear the screen.
     system("clear");
-    return;
+    return 0;
   } else if (regex_match(command, "^[ \t]*source[\t ]+[^ ]+[ \t;]*$", REG_EXTENDED | REG_ICASE)) {
     /* If source file. */
     char *c_ptr = strtok(command, " ;");
@@ -209,6 +209,8 @@ void shellRunCommand(TAOS *con, char *command) {
   } else {
     shellRunCommandOnServer(con, command);
   }
+  
+  return 0;
 }
 
 void shellRunCommandOnServer(TAOS *con, char command[]) {
diff --git a/src/kit/shell/src/shellLinux.c b/src/kit/shell/src/shellLinux.c
index cdf59a7293d8915153b6f148c86a52321b5384d9..15cee042e9e1b9f77353b2be7696a6b0f5eda7d7 100644
--- a/src/kit/shell/src/shellLinux.c
+++ b/src/kit/shell/src/shellLinux.c
@@ -295,6 +295,7 @@ void *shellLoopQuery(void *arg) {
     tscError("failed to malloc command");
     return NULL;
   }
+  
   while (1) {
     // Read command from shell.
 
@@ -304,11 +305,16 @@ void *shellLoopQuery(void *arg) {
     reset_terminal_mode();
 
     // Run the command
-    shellRunCommand(con, command);
+    if (shellRunCommand(con, command) != 0) {
+      break;
+    }
   }
+  
+  tfree(command);
+  exitShell();
 
   pthread_cleanup_pop(1);
-
+  
   return NULL;
 }
 
@@ -487,6 +493,7 @@ void showOnScreen(Command *cmd) {
 void cleanup_handler(void *arg) { tcsetattr(0, TCSANOW, &oldtio); }
 
 void exitShell() {
-  tcsetattr(0, TCSANOW, &oldtio);
+  /*int32_t ret =*/ tcsetattr(STDIN_FILENO, TCSANOW, &oldtio);
+  taos_cleanup();
   exit(EXIT_SUCCESS);
 }
diff --git a/src/kit/shell/src/shellMain.c b/src/kit/shell/src/shellMain.c
index 81a41453e8ab05b572c762a5abbcc97749e3ed62..b39fba285ff09a5e83632e17299565fcd1b4a943 100644
--- a/src/kit/shell/src/shellMain.c
+++ b/src/kit/shell/src/shellMain.c
@@ -95,7 +95,7 @@ int main(int argc, char* argv[]) {
     exit(EXIT_FAILURE);
   }
 
-  /* Interupt handler. */
+  /* Interrupt handler. */
   struct sigaction act;
   memset(&act, 0, sizeof(struct sigaction));
   
diff --git a/src/util/src/hash.c b/src/util/src/hash.c
index f0a23ec0937a42adca0f8bcfd71846c7340bb025..6beb195d36ab5043ed1659c8d9cb838810519d2b 100644
--- a/src/util/src/hash.c
+++ b/src/util/src/hash.c
@@ -101,8 +101,6 @@ static void doUpdateHashTable(SHashObj *pHashObj, SHashNode *pNode) {
   if (pNode->next) {
     (pNode->next)->prev = pNode;
   }
-
-  pTrace("key:%s %p update hash table", pNode->key, pNode);
 }
 
 /**
@@ -153,18 +151,18 @@ static void taosHashTableResize(SHashObj *pHashObj) {
   SHashNode *pNode = NULL;
   SHashNode *pNext = NULL;
 
-  int32_t newSize = pHashObj->capacity << 1U;
+  int32_t newSize = pHashObj->capacity << 1u;
   if (newSize > HASH_MAX_CAPACITY) {
-    pTrace("current capacity:%d, maximum capacity:%d, no resize applied due to limitation is reached",
-           pHashObj->capacity, HASH_MAX_CAPACITY);
+//    pTrace("current capacity:%d, maximum capacity:%d, no resize applied due to limitation is reached",
+//           pHashObj->capacity, HASH_MAX_CAPACITY);
     return;
   }
 
-  int64_t st = taosGetTimestampUs();
+//  int64_t st = taosGetTimestampUs();
 
   SHashEntry **pNewEntry = realloc(pHashObj->hashList, sizeof(SHashEntry *) * newSize);
   if (pNewEntry == NULL) {
-    pTrace("cache resize failed due to out of memory, capacity remain:%d", pHashObj->capacity);
+//    pTrace("cache resize failed due to out of memory, capacity remain:%d", pHashObj->capacity);
     return;
   }
 
@@ -230,10 +228,9 @@ static void taosHashTableResize(SHashObj *pHashObj) {
     }
   }
 
-  int64_t et = taosGetTimestampUs();
-
-  pTrace("hash table resize completed, new capacity:%d, load factor:%f, elapsed time:%fms", pHashObj->capacity,
-         ((double)pHashObj->size) / pHashObj->capacity, (et - st) / 1000.0);
+//  int64_t et = taosGetTimestampUs();
+//  pTrace("hash table resize completed, new capacity:%d, load factor:%f, elapsed time:%fms", pHashObj->capacity,
+//         ((double)pHashObj->size) / pHashObj->capacity, (et - st) / 1000.0);
 }
 
 /**