diff --git a/source/common/src/tglobal.c b/source/common/src/tglobal.c
index a6e30ae0b5b77479d8b3e6cf6c130f5c8817da04..80be8c6a35407045cfc042a810e957a6860ab49d 100644
--- a/source/common/src/tglobal.c
+++ b/source/common/src/tglobal.c
@@ -58,7 +58,7 @@ int32_t tsNumOfMnodeFetchThreads = 1;
 int32_t tsNumOfMnodeReadThreads = 1;
 int32_t tsNumOfVnodeQueryThreads = 4;
 int32_t tsNumOfVnodeStreamThreads = 2;
-int32_t tsNumOfVnodeFetchThreads = 4;
+int32_t tsNumOfVnodeFetchThreads = 1;
 int32_t tsNumOfVnodeWriteThreads = 2;
 int32_t tsNumOfVnodeSyncThreads = 2;
 int32_t tsNumOfVnodeRsmaThreads = 2;
@@ -162,8 +162,8 @@ int32_t tsMqRebalanceInterval = 2;
 int32_t tsTtlUnit = 86400;
 int32_t tsTtlPushInterval = 86400;
 int32_t tsGrantHBInterval = 60;
-int32_t tsUptimeInterval = 300;  // seconds
-char    tsUdfdResFuncs[1024] = ""; // udfd resident funcs that teardown when udfd exits
+int32_t tsUptimeInterval = 300;     // seconds
+char    tsUdfdResFuncs[1024] = "";  // udfd resident funcs that teardown when udfd exits
 
 #ifndef _STORAGE
 int32_t taosSetTfsCfg(SConfig *pCfg) {
@@ -366,9 +366,8 @@ static int32_t taosAddServerCfg(SConfig *pCfg) {
   tsNumOfVnodeStreamThreads = TMAX(tsNumOfVnodeStreamThreads, 4);
   if (cfgAddInt32(pCfg, "numOfVnodeStreamThreads", tsNumOfVnodeStreamThreads, 4, 1024, 0) != 0) return -1;
 
-  tsNumOfVnodeFetchThreads = tsNumOfCores / 4;
-  tsNumOfVnodeFetchThreads = TMAX(tsNumOfVnodeFetchThreads, 4);
-  if (cfgAddInt32(pCfg, "numOfVnodeFetchThreads", tsNumOfVnodeFetchThreads, 4, 1024, 0) != 0) return -1;
+  tsNumOfVnodeFetchThreads = 1;
+  if (cfgAddInt32(pCfg, "numOfVnodeFetchThreads", tsNumOfVnodeFetchThreads, 1, 1024, 0) != 0) return -1;
 
   tsNumOfVnodeWriteThreads = tsNumOfCores;
   tsNumOfVnodeWriteThreads = TMAX(tsNumOfVnodeWriteThreads, 1);
diff --git a/source/libs/executor/src/executor.c b/source/libs/executor/src/executor.c
index 45b88ec6a5c8143ba192aa7924cd873e4b406e6c..a36307de93aac793fc0168fe1fbbdb9800f0f506 100644
--- a/source/libs/executor/src/executor.c
+++ b/source/libs/executor/src/executor.c
@@ -52,11 +52,11 @@ static int32_t doSetStreamBlock(SOperatorInfo* pOperator, void* input, size_t nu
     // TODO: if a block was set but not consumed,
     // prevent setting a different type of block
     pInfo->validBlockIndex = 0;
-    if (pInfo->blockType == STREAM_INPUT__DATA_BLOCK) {
-      taosArrayClearP(pInfo->pBlockLists, taosMemoryFree);
-    } else {
-      taosArrayClear(pInfo->pBlockLists);
-    }
+    /*if (pInfo->blockType == STREAM_INPUT__DATA_BLOCK) {*/
+    /*taosArrayClearP(pInfo->pBlockLists, taosMemoryFree);*/
+    /*} else {*/
+    taosArrayClear(pInfo->pBlockLists);
+    /*}*/
 
     if (type == STREAM_INPUT__MERGED_SUBMIT) {
       // ASSERT(numOfBlocks > 1);
@@ -79,7 +79,9 @@ static int32_t doSetStreamBlock(SOperatorInfo* pOperator, void* input, size_t nu
     } else if (type == STREAM_INPUT__DATA_BLOCK) {
       for (int32_t i = 0; i < numOfBlocks; ++i) {
         SSDataBlock* pDataBlock = &((SSDataBlock*)input)[i];
+        taosArrayPush(pInfo->pBlockLists, &pDataBlock);
 
+#if 0
         // TODO optimize
         SSDataBlock* p = createOneDataBlock(pDataBlock, false);
         p->info = pDataBlock->info;
@@ -87,6 +89,7 @@ static int32_t doSetStreamBlock(SOperatorInfo* pOperator, void* input, size_t nu
         taosArrayClear(p->pDataBlock);
         taosArrayAddAll(p->pDataBlock, pDataBlock->pDataBlock);
         taosArrayPush(pInfo->pBlockLists, &p);
+#endif
       }
       pInfo->blockType = STREAM_INPUT__DATA_BLOCK;
     } else {
diff --git a/source/libs/executor/src/scanoperator.c b/source/libs/executor/src/scanoperator.c
index 4d16b2e17047de683f2c72ef871fd907e6dc1d81..8dcc2cd39be48e6d7c3d2cc6e14ed9239286cbb5 100644
--- a/source/libs/executor/src/scanoperator.c
+++ b/source/libs/executor/src/scanoperator.c
@@ -1602,26 +1602,30 @@ static SSDataBlock* doStreamScan(SOperatorInfo* pOperator) {
       } break;
       case STREAM_DELETE_DATA: {
         printDataBlock(pBlock, "stream scan delete recv");
+        SSDataBlock* pDelBlock = NULL;
         if (pInfo->tqReader) {
-          SSDataBlock* pDelBlock = createSpecialDataBlock(STREAM_DELETE_DATA);
+          pDelBlock = createSpecialDataBlock(STREAM_DELETE_DATA);
           filterDelBlockByUid(pDelBlock, pBlock, pInfo);
-          pBlock = pDelBlock;
+        } else {
+          pDelBlock = pBlock;
         }
-        printDataBlock(pBlock, "stream scan delete recv filtered");
         if (!isIntervalWindow(pInfo) && !isSessionWindow(pInfo) && !isStateWindow(pInfo)) {
-          generateDeleteResultBlock(pInfo, pBlock, pInfo->pDeleteDataRes);
+          generateDeleteResultBlock(pInfo, pDelBlock, pInfo->pDeleteDataRes);
           pInfo->pDeleteDataRes->info.type = STREAM_DELETE_RESULT;
-          printDataBlock(pBlock, "stream scan delete result");
+          printDataBlock(pDelBlock, "stream scan delete result");
           return pInfo->pDeleteDataRes;
         } else {
           pInfo->blockType = STREAM_INPUT__DATA_SUBMIT;
           pInfo->updateResIndex = 0;
-          generateScanRange(pInfo, pBlock, pInfo->pUpdateRes);
+          generateScanRange(pInfo, pDelBlock, pInfo->pUpdateRes);
           prepareRangeScan(pInfo, pInfo->pUpdateRes, &pInfo->updateResIndex);
           copyDataBlock(pInfo->pDeleteDataRes, pInfo->pUpdateRes);
           pInfo->pDeleteDataRes->info.type = STREAM_DELETE_DATA;
           pInfo->scanMode = STREAM_SCAN_FROM_DATAREADER_RANGE;
-          printDataBlock(pBlock, "stream scan delete data");
+          printDataBlock(pDelBlock, "stream scan delete data");
+          if (pInfo->tqReader) {
+            blockDataDestroy(pDelBlock);
+          }
           return pInfo->pDeleteDataRes;
         }
       } break;