diff --git a/source/libs/executor/inc/groupcache.h b/source/libs/executor/inc/groupcache.h
index 45e0d01be6..1278fa5553 100755
--- a/source/libs/executor/inc/groupcache.h
+++ b/source/libs/executor/inc/groupcache.h
@@ -46,6 +46,11 @@ typedef struct SGroupSeqBlkList {
   int64_t        endBlkId;
 } SGroupSeqBlkList;
 
+typedef struct SGroupBatchBlkList {
+  SRWLatch         lock;
+  SArray*          pBlkList;
+} SGroupBatchBlkList;
+
 typedef struct SGroupCacheData {
   TdThreadMutex  mutex;
   SArray*        waitQueue;
@@ -55,8 +60,8 @@ typedef struct SGroupCacheData {
   int32_t        downstreamIdx;
   int32_t        vgId;
   union {
-    SGroupSeqBlkList blkList;
-    SArray*          pBlkList;
+    SGroupSeqBlkList   seqList;
+    SGroupBatchBlkList batchList;
   };
   uint32_t       fileId;
   int64_t        startOffset;
diff --git a/source/libs/executor/src/groupcacheoperator.c b/source/libs/executor/src/groupcacheoperator.c
index 6b2dba25fa..117763b40a 100755
--- a/source/libs/executor/src/groupcacheoperator.c
+++ b/source/libs/executor/src/groupcacheoperator.c
@@ -219,6 +219,8 @@ static int32_t retrieveBlkFromBufCache(SGroupCacheOperatorInfo* pGCache, SGroupC
 
   //TODO READ FROM FILE
   code = TSDB_CODE_INVALID_PARA;
+  qError("block %" PRId64 "not found in dirty block list", blkId);
+  
   return code;
 }
 
@@ -369,10 +371,10 @@ static FORCE_INLINE void initNewGroupData(SGcDownstreamCtx* pCtx, SGroupCacheDat
   pGroup->vgId = vgId;
   pGroup->fileId = -1;
   if (batchFetch) {
-    pGroup->pBlkList = taosArrayInit(10, POINTER_BYTES);
+    pGroup->batchList.pBlkList = taosArrayInit(10, POINTER_BYTES);
   } else {
-    pGroup->blkList.startBlkId = -1;
-    pGroup->blkList.endBlkId = -1;
+    pGroup->seqList.startBlkId = -1;
+    pGroup->seqList.endBlkId = -1;
 
   }
   pGroup->startOffset = -1;
@@ -422,19 +424,21 @@ static int32_t addNewGroupData(struct SOperatorInfo* pOperator, SOperatorParam*
 
 static int32_t addBlkToGroupCache(bool batchFetch, SGroupCacheData* pGroup, SGcBlkBufInfo* pNewBlk) {
   if (batchFetch) {
-    taosArrayPush(pGroup->pBlkList, &pNewBlk->blkId);
-    qError("block added to group cache, total block num:%" PRId64, (int64_t)taosArrayGetSize(pGroup->pBlkList));
+    taosWLockLatch(&pGroup->batchList.lock);
+    taosArrayPush(pGroup->batchList.pBlkList, &pNewBlk->blkId);
+    qError("block added to group cache, total block num:%" PRId64, (int64_t)taosArrayGetSize(pGroup->batchList.pBlkList));
+    taosWUnLockLatch(&pGroup->batchList.lock);
     return TSDB_CODE_SUCCESS;
   }
   
-  if (pGroup->blkList.endBlkId > 0) {
-    pGroup->blkList.endBlkId = pNewBlk->blkId;
+  if (pGroup->seqList.endBlkId > 0) {
+    atomic_store_64(&pGroup->seqList.endBlkId, pNewBlk->blkId);
   } else {
-    pGroup->blkList.startBlkId = pNewBlk->blkId;
-    pGroup->blkList.endBlkId = pNewBlk->blkId;
+    atomic_store_64(&pGroup->seqList.startBlkId, pNewBlk->blkId);
+    atomic_store_64(&pGroup->seqList.endBlkId, pNewBlk->blkId);
   }
 
-  qError("block added to group cache, total block num:%" PRId64, pGroup->blkList.endBlkId - pGroup->blkList.startBlkId + 1);
+  qError("block added to group cache, total block num:%" PRId64, pGroup->seqList.endBlkId - pGroup->seqList.startBlkId + 1);
 
   return TSDB_CODE_SUCCESS;
 }
@@ -568,32 +572,38 @@ static int32_t getBlkFromSessionCacheImpl(struct SOperatorInfo* pOperator, int64
   *got = true;
   
   if (pGCache->batchFetch) {
+    SGroupBatchBlkList* pBatchList = &pSession->pGroupData->batchList;
+    taosRLockLatch(&pBatchList->lock);
+    int64_t blkNum = taosArrayGetSize(pBatchList->pBlkList);
     if (pSession->lastBlkId < 0) {
-      if (taosArrayGetSize(pSession->pGroupData->pBlkList) > 0) {
-        int64_t* pIdx = taosArrayGet(pSession->pGroupData->pBlkList, 0);
+      if (blkNum > 0) {
+        int64_t* pIdx = taosArrayGet(pBatchList->pBlkList, 0);
+        taosRUnLockLatch(&pBatchList->lock);
         code = retrieveBlkFromBufCache(pGCache, pSession->pGroupData, sessionId, *pIdx, &pSession->nextOffset, ppRes);
         pSession->lastBlkId = *pIdx;
         return code;
       }
-    } else if (pSession->lastBlkId < taosArrayGetSize(pSession->pGroupData->pBlkList)) {
-      int64_t* pIdx = taosArrayGet(pSession->pGroupData->pBlkList, pSession->lastBlkId + 1);
+    } else if (pSession->lastBlkId < blkNum) {
+      int64_t* pIdx = taosArrayGet(pBatchList->pBlkList, pSession->lastBlkId + 1);
+      taosRUnLockLatch(&pBatchList->lock);
       code = retrieveBlkFromBufCache(pGCache, pSession->pGroupData, sessionId, *pIdx, &pSession->nextOffset, ppRes);
       pSession->lastBlkId++;
       return code;
     }
-  }
-  
-  if (pSession->lastBlkId < 0) {
-    int64_t startBlkId = atomic_load_64(&pSession->pGroupData->blkList.startBlkId);
-    if (startBlkId > 0) {
-      code = retrieveBlkFromBufCache(pGCache, pSession->pGroupData, sessionId, startBlkId, &pSession->nextOffset, ppRes);
-      pSession->lastBlkId = startBlkId;
+    taosRUnLockLatch(&pBatchList->lock);
+  } else {
+    if (pSession->lastBlkId < 0) {
+      int64_t startBlkId = atomic_load_64(&pSession->pGroupData->seqList.startBlkId);
+      if (startBlkId > 0) {
+        code = retrieveBlkFromBufCache(pGCache, pSession->pGroupData, sessionId, startBlkId, &pSession->nextOffset, ppRes);
+        pSession->lastBlkId = startBlkId;
+        return code;
+      }
+    } else if (pSession->lastBlkId < atomic_load_64(&pSession->pGroupData->seqList.endBlkId)) {
+      code = retrieveBlkFromBufCache(pGCache, pSession->pGroupData, sessionId, pSession->lastBlkId + 1, &pSession->nextOffset, ppRes);
+      pSession->lastBlkId++;
       return code;
     }
-  } else if (pSession->lastBlkId < atomic_load_64(&pSession->pGroupData->blkList.endBlkId)) {
-    code = retrieveBlkFromBufCache(pGCache, pSession->pGroupData, sessionId, pSession->lastBlkId + 1, &pSession->nextOffset, ppRes);
-    pSession->lastBlkId++;
-    return code;
   }
 
   if (atomic_load_8((int8_t*)&pSession->pGroupData->fetchDone)) {