diff --git a/src/client/inc/tscBulkWrite.h b/src/client/inc/tscBulkWrite.h
index f83b9d33c429ecefa630b7db2c58f148f9a387b5..33a6a356b16cd4d778f3c734d40016a566b95c47 100644
--- a/src/client/inc/tscBulkWrite.h
+++ b/src/client/inc/tscBulkWrite.h
@@ -23,6 +23,9 @@ extern "C" {
 #include "tarray.h"
 #include "tthread.h"
 
+// forward declaration.
+typedef struct SSqlObj SSqlObj;
+
 /**
  * SAsyncBulkWriteDispatcher is an async batching dispatcher(for writing), it can buffer insertion statements, batch
  * and merge them into single statement.
@@ -51,15 +54,10 @@ typedef struct SAsyncBulkWriteDispatcher {
   
   // the number of insertion rows in the buffer.
   int32_t currentSize;
-  
-  // the number of item in the buffer.
-  volatile int32_t bufferSize;
-  
-  // while executing timeout task, the buffer will set exclusive for writing.
-  volatile bool exclusive;
 
   // whether the dispatcher is shutdown.
   volatile bool shutdown;
+  
 } SAsyncBulkWriteDispatcher;
 
 // forward declaration.
diff --git a/src/client/src/tscBulkWrite.c b/src/client/src/tscBulkWrite.c
index b723891500d4904702e539eb60651a3e1b5a813d..11b5c3902989b2d56fc72a0e1d4bb19e890a2cc2 100644
--- a/src/client/src/tscBulkWrite.c
+++ b/src/client/src/tscBulkWrite.c
@@ -151,7 +151,7 @@ int32_t dispatcherStatementMerge(SArray* statements, SSqlObj** result) {
  * @return              the items in the dispatcher, SArray<SSqlObj*>.
  */
 inline static SArray* dispatcherPollAll(SAsyncBulkWriteDispatcher* dispatcher) {
-  if (!atomic_load_32(&dispatcher->bufferSize)) {
+  if (!taosArrayGetSize(dispatcher->buffer)) {
     return NULL;
   }
   
@@ -162,7 +162,6 @@ inline static SArray* dispatcherPollAll(SAsyncBulkWriteDispatcher* dispatcher) {
   }
   
   dispatcher->currentSize = 0;
-  atomic_store_32(&dispatcher->bufferSize, 0);
   taosArrayClear(dispatcher->buffer);
   return statements;
 }
@@ -207,10 +206,8 @@ inline static bool dispatcherTryOffer(SAsyncBulkWriteDispatcher* dispatcher, SSq
   }
 
   taosArrayPush(dispatcher->buffer, pSql);
-  tscDebug("sql obj %p has been write to insert buffer", pSql);
-
-  atomic_fetch_add_32(&dispatcher->bufferSize, 1);
   dispatcher->currentSize += statementGetInsertionRows(pSql);
+  tscDebug("sql obj %p has been write to insert buffer", pSql);
   
   // the dispatcher has been shutdown or reach batch size.
   if (atomic_load_8(&dispatcher->shutdown) || dispatcher->currentSize >= dispatcher->batchSize) {
@@ -315,10 +312,8 @@ static void* dispatcherTimeoutCallback(void* arg) {
     struct timespec current;
     clock_gettime(CLOCK_REALTIME, &current);
     struct timespec timeout = afterMillis(current, dispatcher->timeoutMs);
-
-    atomic_store_8(&dispatcher->exclusive, true);
+    
     SArray* statements = dispatcherLockPollAll(dispatcher);
-    atomic_store_8(&dispatcher->exclusive, false);
     dispatcherExecute(statements);
     taosArrayDestroy(&statements);
     
@@ -338,10 +333,8 @@ SAsyncBulkWriteDispatcher* createAsyncBulkWriteDispatcher(int32_t batchSize, int
   dispatcher->currentSize = 0;
   dispatcher->batchSize = batchSize;
   dispatcher->timeoutMs = timeoutMs;
-
-  atomic_store_32(&dispatcher->bufferSize, 0);
+  
   atomic_store_8(&dispatcher->shutdown, false);
-  atomic_store_8(&dispatcher->exclusive, false);
 
   // init the buffer.
   dispatcher->buffer = taosArrayInit(batchSize, sizeof(SSqlObj*));
@@ -392,8 +385,12 @@ void destroyAsyncDispatcher(SAsyncBulkWriteDispatcher* dispatcher) {
   dispatcherShutdown(dispatcher);
 
   // poll and send all the statements in the buffer.
-  while (atomic_load_32(&dispatcher->bufferSize)) {
+  while (true) {
     SArray* statements = dispatcherLockPollAll(dispatcher);
+    if (!statements) {
+      break ;
+    }
+    
     dispatcherExecute(statements);
     taosArrayDestroy(&statements);
   }
@@ -452,11 +449,6 @@ bool dispatcherTryDispatch(SAsyncBulkWriteDispatcher* dispatcher, SSqlObj* pSql)
     return false;
   }
 
-  // the buffer is exclusive.
-  if (atomic_load_8(&dispatcher->exclusive)) {
-    return false;
-  }
-
   // try to offer pSql to the buffer.
   return dispatcherTryOffer(dispatcher, pSql);
 }
diff --git a/src/client/src/tscUtil.c b/src/client/src/tscUtil.c
index 19088d161e3fef1763c3c6363f8cac5158800648..a923757af8bb3d0a12c984f17c8e4fb2f1146e2b 100644
--- a/src/client/src/tscUtil.c
+++ b/src/client/src/tscUtil.c
@@ -2224,13 +2224,13 @@ static void extractTableNameList(SSqlObj *pSql, SInsertStatementParam *pInsertPa
  */
 int32_t tscMergeKVPayLoadSqlObj(SArray* statements, SSqlObj **result) {
   // statement array is empty.
-  if (statements == NULL || taosArrayGetSize(statements) == 0) {
+  if (!statements || !taosArrayGetSize(statements)) {
     return TSDB_CODE_TSC_INVALID_OPERATION;
   }
   
   // a.k.a SHashObj<int64_t, STableDataBlocks*>, the key value represents vgroup id.
   SHashObj*              pVnodeDataBlockHashList = taosHashInit(128, taosGetDefaultHashFunction(TSDB_DATA_TYPE_BIGINT), true, false);
-  if (pVnodeDataBlockHashList == NULL) {
+  if (!pVnodeDataBlockHashList) {
     return TSDB_CODE_TSC_OUT_OF_MEMORY;
   }
   
@@ -2307,7 +2307,7 @@ int32_t tscMergeKVPayLoadSqlObj(SArray* statements, SSqlObj **result) {
       // copy the data into vgroup data blocks.
       memcpy(dataBuf->pData + dataBuf->size, tableBlock->pData + tableBlock->headerSize, tableBlock->size - tableBlock->headerSize);
       dataBuf->size += tableBlock->size - tableBlock->headerSize;
-      dataBuf->numOfTables += 1;
+      dataBuf->numOfTables += tableBlock->numOfTables;
       tscDestroyDataBlock(pSql, tableBlock, false);
     }