diff --git a/src/system/detail/inc/vnodeQueryImpl.h b/src/system/detail/inc/vnodeQueryImpl.h
index 9e9101bb132cf8655cbf7bc79c4b65889a52e506..35279ca011f1a8aeec012e1d2311862dde2f95ca 100644
--- a/src/system/detail/inc/vnodeQueryImpl.h
+++ b/src/system/detail/inc/vnodeQueryImpl.h
@@ -111,7 +111,7 @@ typedef enum {
 #define SET_MASTER_SCAN_FLAG(runtime) ((runtime)->scanFlag = MASTER_SCAN)
 
 typedef int (*__block_search_fn_t)(char* data, int num, int64_t key, int order);
-typedef int32_t (*__read_data_fn_t)(int fd, SQInfo* pQInfo, SQueryFileInfo* pQueryFile, char* buf, uint64_t offset,
+typedef int32_t (*__read_data_fn_t)(int fd, SQInfo* pQInfo, SQueryFilesInfo* pQueryFile, char* buf, uint64_t offset,
                                     int32_t size);
 
 static FORCE_INLINE SMeterObj* getMeterObj(void* hashHandle, int32_t sid) {
@@ -191,7 +191,7 @@ int64_t getQueryStartPositionInCache(SQueryRuntimeEnv* pRuntimeEnv, int32_t* slo
 int64_t getNextAccessedKeyInData(SQuery* pQuery, int64_t* pPrimaryCol, SBlockInfo* pBlockInfo, int32_t blockStatus);
 
 uint32_t getDataBlocksForMeters(SMeterQuerySupportObj* pSupporter, SQuery* pQuery, char* pHeaderData,
-                                int32_t numOfMeters, SQueryFileInfo* pQueryFileInfo, SMeterDataInfo** pMeterDataInfo);
+                                int32_t numOfMeters, const char* filePath, SMeterDataInfo** pMeterDataInfo);
 int32_t LoadDatablockOnDemand(SCompBlock* pBlock, SField** pFields, uint8_t* blkStatus, SQueryRuntimeEnv* pRuntimeEnv,
                               int32_t fileIdx, int32_t slotIdx, __block_search_fn_t searchFn, bool onDemand);
 char *vnodeGetHeaderFileData(SQueryRuntimeEnv *pRuntimeEnv, int32_t vnodeId, int32_t fileIndex);
diff --git a/src/system/detail/inc/vnodeRead.h b/src/system/detail/inc/vnodeRead.h
index bc17eb569596dc09e815eb1b7ae586a73008b7e2..f37030d97eb0ccd1a1c07fdb29e72e61356d3fa5 100644
--- a/src/system/detail/inc/vnodeRead.h
+++ b/src/system/detail/inc/vnodeRead.h
@@ -47,29 +47,14 @@ typedef struct SQueryLoadCompBlockInfo {
   int32_t fileId;
   int32_t fileListIndex;
 } SQueryLoadCompBlockInfo;
+
 /*
  * the header file info for one vnode
  */
-typedef struct SQueryFileInfo {
-  int32_t fileID;              /* file id */
-  char    headerFilePath[PATH_MAX]; /* full file name */
-  char    dataFilePath[PATH_MAX];
-  char    lastFilePath[PATH_MAX];
-  int32_t defaultMappingSize; /* default mapping size */
-
-  int32_t  headerFd;        /* file handler */
-  char*    pHeaderFileData; /* mmap header files */
-  size_t   headFileSize;
-  int32_t  dataFd;
-  char*    pDataFileData;
-  size_t   dataFileSize;
-  uint64_t dtFileMappingOffset;
-
-  int32_t  lastFd;
-  size_t   lastFileSize;
-  uint64_t lastFileMappingOffset;
-
-} SQueryFileInfo;
+typedef struct SHeaderFileInfo {
+  int32_t fileID;        // file id
+  size_t  headFileSize;  // header file size
+} SHeaderFileInfo;
 
 typedef struct SQueryCostSummary {
   double cacheTimeUs;
@@ -106,6 +91,27 @@ typedef struct SOutputRes {
   SResultInfo* resultInfo;
 } SOutputRes;
 
+/*
+ * header files info, avoid to iterate the directory, the data is acquired
+ * during in query preparation function
+ */
+typedef struct SQueryFilesInfo {
+  SHeaderFileInfo* pFileInfo;
+  uint32_t         numOfFiles;  // the total available number of files for this virtual node during query execution
+  int32_t          current;     // the memory mapped header file, NOTE: only one header file can be mmap.
+  int32_t          vnodeId;
+  
+  int32_t          headerFd;    // header file fd
+  char*            pHeaderFileData; // mmap header files
+  
+  int32_t          dataFd;
+  int32_t          lastFd;
+  char             headerFilePath[PATH_MAX];  // current opened header file name
+  char             dataFilePath[PATH_MAX];    // current opened data file name
+  char             lastFilePath[PATH_MAX];    // current opened last file path
+  char             dbFilePathPrefix[PATH_MAX];
+} SQueryFilesInfo;
+
 typedef struct RuntimeEnvironment {
   SPositionInfo       startPos; /* the start position, used for secondary/third iteration */
   SPositionInfo       endPos;   /* the last access position in query, served as the start pos of reversed order query */
@@ -122,17 +128,10 @@ typedef struct RuntimeEnvironment {
   SQLFunctionCtx*     pCtx;
   SQueryLoadBlockInfo loadBlockInfo;         /* record current block load information */
   SQueryLoadCompBlockInfo loadCompBlockInfo; /* record current compblock information in SQuery */
-
-  /*
-   * header files info, avoid to iterate the directory, the data is acquired
-   * during in query preparation function
-   */
-  SQueryFileInfo*    pVnodeFiles;
-  uint32_t           numOfFiles;  // the total available number of files for this virtual node during query execution
-  int32_t            mmapedHFileIndex;  // the mmaped header file, NOTE: only one header file can be mmap.
+  SQueryFilesInfo         vnodeFileInfo;
   int16_t            numOfRowsPerPage;
   int16_t            offset[TSDB_MAX_COLUMNS];
-  int16_t            scanFlag; // denotes reversed scan of data or not
+  int16_t            scanFlag;  // denotes reversed scan of data or not
   SInterpolationInfo interpoInfo;
   SData**            pInterpoBuf;
   SOutputRes*        pResult;  // reference to SQuerySupporter->pResult
diff --git a/src/system/detail/src/vnodeQueryImpl.c b/src/system/detail/src/vnodeQueryImpl.c
index dfef6862d01579ca6d2aa89ca376bbd8444b0810..04c5dcb24ed2df51a5a5043365aca98a30f797ff 100644
--- a/src/system/detail/src/vnodeQueryImpl.c
+++ b/src/system/detail/src/vnodeQueryImpl.c
@@ -40,12 +40,12 @@ enum {
 
 #define IS_DISK_DATA_BLOCK(q) ((q)->fileId >= 0)
 
-static int32_t copyDataFromMMapBuffer(int fd, SQInfo *pQInfo, SQueryFileInfo *pQueryFile, char *buf, uint64_t offset,
-                                      int32_t size);
-static int32_t readDataFromDiskFile(int fd, SQInfo *pQInfo, SQueryFileInfo *pQueryFile, char *buf, uint64_t offset,
+//static int32_t copyDataFromMMapBuffer(int fd, SQInfo *pQInfo, SQueryFilesInfo *pQueryFile, char *buf, uint64_t offset,
+//                                      int32_t size);
+static int32_t readDataFromDiskFile(int fd, SQInfo *pQInfo, SQueryFilesInfo *pQueryFile, char *buf, uint64_t offset,
                                     int32_t size);
 
-__read_data_fn_t readDataFunctor[2] = {copyDataFromMMapBuffer, readDataFromDiskFile};
+//__read_data_fn_t readDataFunctor[2] = {copyDataFromMMapBuffer, readDataFromDiskFile};
 
 static void    vnodeInitLoadCompBlockInfo(SQueryLoadCompBlockInfo *pCompBlockLoadInfo);
 static int32_t moveToNextBlock(SQueryRuntimeEnv *pRuntimeEnv, int32_t step, __block_search_fn_t searchFn,
@@ -99,7 +99,7 @@ static FORCE_INLINE int32_t getCompHeaderStartPosition(SVnodeCfg *pCfg) {
 }
 
 static FORCE_INLINE int32_t validateCompBlockOffset(SQInfo *pQInfo, SMeterObj *pMeterObj, SCompHeader *pCompHeader,
-                                                    SQueryFileInfo *pQueryFileInfo, int32_t headerSize) {
+                                                    SHeaderFileInfo *pQueryFileInfo, int32_t headerSize) {
   if (pCompHeader->compInfoOffset < headerSize || pCompHeader->compInfoOffset > pQueryFileInfo->headFileSize) {
     dError("QInfo:%p vid:%d sid:%d id:%s, compInfoOffset:%d is not valid, size:%ld", pQInfo, pMeterObj->vnode,
            pMeterObj->sid, pMeterObj->meterId, pCompHeader->compInfoOffset, pQueryFileInfo->headFileSize);
@@ -195,7 +195,7 @@ static bool vnodeIsCompBlockInfoLoaded(SQueryRuntimeEnv *pRuntimeEnv, SMeterObj
   // if vnodeFreeFields is called, the pQuery->pFields is NULL
   if (pLoadCompBlockInfo->fileListIndex == fileIndex && pLoadCompBlockInfo->sid == pMeterObj->sid &&
       pQuery->pFields != NULL && pQuery->fileId > 0) {
-    assert(pRuntimeEnv->pVnodeFiles[fileIndex].fileID == pLoadCompBlockInfo->fileId && pQuery->numOfBlocks > 0);
+    assert(pRuntimeEnv->vnodeFileInfo.pFileInfo[fileIndex].fileID == pLoadCompBlockInfo->fileId && pQuery->numOfBlocks > 0);
     return true;
   }
 
@@ -207,7 +207,7 @@ static void vnodeSetCompBlockInfoLoaded(SQueryRuntimeEnv *pRuntimeEnv, int32_t f
 
   pLoadCompBlockInfo->sid = sid;
   pLoadCompBlockInfo->fileListIndex = fileIndex;
-  pLoadCompBlockInfo->fileId = pRuntimeEnv->pVnodeFiles[fileIndex].fileID;
+  pLoadCompBlockInfo->fileId = pRuntimeEnv->vnodeFileInfo.pFileInfo[fileIndex].fileID;
 }
 
 static void vnodeInitLoadCompBlockInfo(SQueryLoadCompBlockInfo *pCompBlockLoadInfo) {
@@ -259,49 +259,90 @@ static bool isHeaderFileEmpty(int32_t vnodeId, size_t headerFileSize) {
   return headerFileSize <= getCompHeaderStartPosition(pVnodeCfg);
 }
 
-static void doCloseQueryFileInfoFD(SQueryFileInfo* pVnodeFiles) {
-  tclose(pVnodeFiles->headerFd);
-  tclose(pVnodeFiles->dataFd);
-  tclose(pVnodeFiles->lastFd);
+static void doCloseQueryFileInfoFD(SQueryFilesInfo* pVnodeFilesInfo) {
+  tclose(pVnodeFilesInfo->headerFd);
+  tclose(pVnodeFilesInfo->dataFd);
+  tclose(pVnodeFilesInfo->lastFd);
+}
+
+static void doInitQueryFileInfoFD(SQueryFilesInfo* pVnodeFilesInfo) {
+  pVnodeFilesInfo->current = -1;
+  
+  pVnodeFilesInfo->headerFd = FD_INITIALIZER;  // set the initial value
+  pVnodeFilesInfo->dataFd = FD_INITIALIZER;
+  pVnodeFilesInfo->lastFd = FD_INITIALIZER;
 }
 
-static int32_t doOpenQueryFileInfoDF(SQInfo* pQInfo, SQueryFileInfo* pVnodeFiles) {
+static int32_t doOpenQueryFileData(SQInfo* pQInfo, SQueryFilesInfo* pVnodeFiles) {
   // if the header is smaller than a threshold value, this file is empty, no need to
+  SHeaderFileInfo* pCurrentFileInfo = &pVnodeFiles->pFileInfo[pVnodeFiles->current];
+  
+  // set the full file path for current opened files
+  snprintf(pVnodeFiles->headerFilePath, PATH_MAX, "%sv%df%d.head", pVnodeFiles->dbFilePathPrefix,
+      pVnodeFiles->vnodeId, pCurrentFileInfo->fileID);
+  
   pVnodeFiles->headerFd = open(pVnodeFiles->headerFilePath, O_RDONLY);
   if (!FD_VALID(pVnodeFiles->headerFd)) {
     dError("QInfo:%p failed open header file:%s reason:%s", pQInfo, pVnodeFiles->headerFilePath, strerror(errno));
     return -1;
   }
   
+  snprintf(pVnodeFiles->dataFilePath, PATH_MAX, "%sv%df%d.data", pVnodeFiles->dbFilePathPrefix,
+           pVnodeFiles->vnodeId, pCurrentFileInfo->fileID);
+  
   pVnodeFiles->dataFd = open(pVnodeFiles->dataFilePath, O_RDONLY);
-  if (!FD_VALID(pVnodeFiles->headerFd)) {
+  if (!FD_VALID(pVnodeFiles->dataFd)) {
     dError("QInfo:%p failed open data file:%s reason:%s", pQInfo, pVnodeFiles->dataFilePath, strerror(errno));
     return -1;
   }
   
+  snprintf(pVnodeFiles->lastFilePath, PATH_MAX, "%sv%df%d.last", pVnodeFiles->dbFilePathPrefix,
+           pVnodeFiles->vnodeId, pCurrentFileInfo->fileID);
+  
   pVnodeFiles->lastFd = open(pVnodeFiles->lastFilePath, O_RDONLY);
-  if (!FD_VALID(pVnodeFiles->headerFd)) {
+  if (!FD_VALID(pVnodeFiles->lastFd)) {
     dError("QInfo:%p failed open last file:%s reason:%s", pQInfo, pVnodeFiles->lastFilePath, strerror(errno));
     return -1;
   }
   
+  pVnodeFiles->pHeaderFileData = mmap(NULL, pCurrentFileInfo->headFileSize, PROT_READ, MAP_SHARED,
+                                      pVnodeFiles->headerFd, 0);
+  
+  if (pVnodeFiles->pHeaderFileData == MAP_FAILED) {
+    pVnodeFiles->pHeaderFileData = NULL;
+    
+    doCloseQueryFileInfoFD(pVnodeFiles);
+    doInitQueryFileInfoFD(pVnodeFiles);
+    
+    dError("QInfo:%p failed to mmap header file:%s, size:%lld, %s", pQInfo, pVnodeFiles->headerFilePath,
+           pCurrentFileInfo->headFileSize, strerror(errno));
+    
+    return -1;
+  } else {
+    if (madvise(pVnodeFiles->pHeaderFileData, pCurrentFileInfo->headFileSize, MADV_SEQUENTIAL) == -1) {
+      dError("QInfo:%p failed to advise kernel the usage of header file, reason:%s", pQInfo, strerror(errno));
+    }
+  }
+  
   return TSDB_CODE_SUCCESS;
 }
 
-static void doUnmapHeaderFileData(SQueryRuntimeEnv* pRuntimeEnv) {
-  if (pRuntimeEnv->mmapedHFileIndex >= 0) {
-    assert(pRuntimeEnv->mmapedHFileIndex < pRuntimeEnv->numOfFiles && pRuntimeEnv->mmapedHFileIndex >= 0);
+static void doCloseOpenedFileData(SQueryFilesInfo* pVnodeFileInfo) {
+  if (pVnodeFileInfo->current >= 0) {
+    
+    assert(pVnodeFileInfo->current < pVnodeFileInfo->numOfFiles && pVnodeFileInfo->current >= 0 &&
+        pVnodeFileInfo->pHeaderFileData != NULL);
     
-    SQueryFileInfo *otherVnodeFiles = &pRuntimeEnv->pVnodeFiles[pRuntimeEnv->mmapedHFileIndex];
-    munmap(otherVnodeFiles->pHeaderFileData, otherVnodeFiles->headFileSize);
+    SHeaderFileInfo *pCurrentFile = &pVnodeFileInfo->pFileInfo[pVnodeFileInfo->current];
     
-    otherVnodeFiles->pHeaderFileData = NULL;
-    doCloseQueryFileInfoFD(otherVnodeFiles);
+    munmap(pVnodeFileInfo->pHeaderFileData, pCurrentFile->headFileSize);
+    pVnodeFileInfo->pHeaderFileData = NULL;
     
-    pRuntimeEnv->mmapedHFileIndex = -1;
+    doCloseQueryFileInfoFD(pVnodeFileInfo);
+    doInitQueryFileInfoFD(pVnodeFileInfo);
   }
 
-  assert(pRuntimeEnv->mmapedHFileIndex == -1);
+  assert(pVnodeFileInfo->current == -1);
 }
 
 /**
@@ -314,46 +355,40 @@ static void doUnmapHeaderFileData(SQueryRuntimeEnv* pRuntimeEnv) {
  * @return   the return value may be null, so any invoker needs to check the returned value
  */
 char *vnodeGetHeaderFileData(SQueryRuntimeEnv *pRuntimeEnv, int32_t vnodeId, int32_t fileIndex) {
-  assert(fileIndex >= 0 && fileIndex < pRuntimeEnv->numOfFiles);
+  assert(fileIndex >= 0 && fileIndex < pRuntimeEnv->vnodeFileInfo.numOfFiles);
 
   SQuery *pQuery = pRuntimeEnv->pQuery;
   SQInfo *pQInfo = (SQInfo *)GET_QINFO_ADDR(pQuery);  // only for log output
 
-  SQueryFileInfo *pVnodeFiles = &pRuntimeEnv->pVnodeFiles[fileIndex];
+  SQueryFilesInfo *pVnodeFileInfo = &pRuntimeEnv->vnodeFileInfo;
+  SHeaderFileInfo *pHeaderFileInfo = &pVnodeFileInfo->pFileInfo[fileIndex];
   
-  if (pVnodeFiles->pHeaderFileData == NULL) {
-    assert(pRuntimeEnv->mmapedHFileIndex != fileIndex);
-    doUnmapHeaderFileData(pRuntimeEnv);     // do close the other memory mapped header file
-  
-    assert(pVnodeFiles->pHeaderFileData == NULL);
+  if (pVnodeFileInfo->current != fileIndex || pVnodeFileInfo->pHeaderFileData == NULL) {
+    if (pVnodeFileInfo->current >= 0) {
+      assert(pVnodeFileInfo->pHeaderFileData != NULL);
+    }
+    
+    doCloseOpenedFileData(pVnodeFileInfo);     // do close the other memory mapped header file
+    assert(pVnodeFileInfo->pHeaderFileData == NULL);
     
     // current header file is empty or broken, return directly
-    if (isHeaderFileEmpty(vnodeId, pVnodeFiles->headFileSize)) {
-      return pVnodeFiles->pHeaderFileData;
+    if (isHeaderFileEmpty(vnodeId, pHeaderFileInfo->headFileSize)) {
+      qTrace("QInfo:%p vid:%d, fileId:%d, index:%d, size:%d, ignore file, empty or broken", pQInfo,
+          pVnodeFileInfo->vnodeId, pHeaderFileInfo->fileID, fileIndex, pHeaderFileInfo->headFileSize);
+      
+      return pVnodeFileInfo->pHeaderFileData;
     }
     
-    if (doOpenQueryFileInfoDF(pQInfo, pVnodeFiles) != TSDB_CODE_SUCCESS) {
-      return pVnodeFiles->pHeaderFileData;
-    }
+    // set current opened file Index
+    pVnodeFileInfo->current = fileIndex;
     
-    pVnodeFiles->pHeaderFileData = mmap(NULL, pVnodeFiles->headFileSize, PROT_READ, MAP_SHARED, pVnodeFiles->headerFd, 0);
-    if (pVnodeFiles->pHeaderFileData == MAP_FAILED) {
-      pVnodeFiles->pHeaderFileData = NULL;
-      doCloseQueryFileInfoFD(pVnodeFiles);
-      
-      dError("QInfo:%p failed to mmap header file:%s, size:%lld, %s", pQInfo, pVnodeFiles->headerFilePath,
-          pVnodeFiles->headFileSize, strerror(errno));
-    } else {
-      pRuntimeEnv->mmapedHFileIndex = fileIndex;  // set the value in case of success mmap file
-      if (madvise(pVnodeFiles->pHeaderFileData, pVnodeFiles->headFileSize, MADV_SEQUENTIAL) == -1) {
-        dError("QInfo:%p failed to advise kernel the usage of header file, reason:%s", pQInfo, strerror(errno));
-      }
+    if (doOpenQueryFileData(pQInfo, pVnodeFileInfo) != TSDB_CODE_SUCCESS) {
+      doCloseOpenedFileData(pVnodeFileInfo);  // there may be partially open fd, close it anyway.
+      return pVnodeFileInfo->pHeaderFileData;
     }
-  } else {
-    assert(pRuntimeEnv->mmapedHFileIndex == fileIndex);
   }
 
-  return pVnodeFiles->pHeaderFileData;
+  return pVnodeFileInfo->pHeaderFileData;
 }
 
 /*
@@ -365,7 +400,7 @@ static int vnodeGetCompBlockInfo(SMeterObj *pMeterObj, SQueryRuntimeEnv *pRuntim
   SQInfo *pQInfo = (SQInfo *)GET_QINFO_ADDR(pQuery);
 
   SVnodeCfg *     pCfg = &vnodeList[pMeterObj->vnode].cfg;
-  SQueryFileInfo *pQueryFileInfo = &pRuntimeEnv->pVnodeFiles[fileIndex];
+  SHeaderFileInfo *pQueryFileInfo = &pRuntimeEnv->vnodeFileInfo.pFileInfo[fileIndex];
 
   int64_t st = taosGetTimestampUs();
 
@@ -392,7 +427,7 @@ static int vnodeGetCompBlockInfo(SMeterObj *pMeterObj, SQueryRuntimeEnv *pRuntim
 #endif
 
   // check the offset value integrity
-  if (validateHeaderOffsetSegment(pQInfo, pQueryFileInfo->headerFilePath, pMeterObj->vnode, data,
+  if (validateHeaderOffsetSegment(pQInfo, pRuntimeEnv->vnodeFileInfo.headerFilePath, pMeterObj->vnode, data,
                                   getCompHeaderSegSize(pCfg)) < 0) {
     return -1;
   }
@@ -420,7 +455,7 @@ static int vnodeGetCompBlockInfo(SMeterObj *pMeterObj, SQueryRuntimeEnv *pRuntim
 #endif
 
   // check compblock info integrity
-  if (validateCompBlockInfoSegment(pQInfo, pQueryFileInfo->headerFilePath, pMeterObj->vnode, compInfo,
+  if (validateCompBlockInfoSegment(pQInfo, pRuntimeEnv->vnodeFileInfo.headerFilePath, pMeterObj->vnode, compInfo,
                                    compHeader->compInfoOffset) < 0) {
     return -1;
   }
@@ -454,7 +489,7 @@ static int vnodeGetCompBlockInfo(SMeterObj *pMeterObj, SQueryRuntimeEnv *pRuntim
 #endif
 
   // check comp block integrity
-  if (validateCompBlockSegment(pQInfo, pQueryFileInfo->headerFilePath, compInfo, (char *)pQuery->pBlock,
+  if (validateCompBlockSegment(pQInfo, pRuntimeEnv->vnodeFileInfo.headerFilePath, compInfo, (char *)pQuery->pBlock,
                                pMeterObj->vnode, checksum) < 0) {
     return -1;
   }
@@ -464,7 +499,7 @@ static int vnodeGetCompBlockInfo(SMeterObj *pMeterObj, SQueryRuntimeEnv *pRuntim
 
   int64_t et = taosGetTimestampUs();
   qTrace("QInfo:%p vid:%d sid:%d id:%s, fileId:%d, load compblock info, size:%d, elapsed:%f ms", pQInfo,
-         pMeterObj->vnode, pMeterObj->sid, pMeterObj->meterId, pRuntimeEnv->pVnodeFiles[fileIndex].fileID,
+         pMeterObj->vnode, pMeterObj->sid, pMeterObj->meterId, pRuntimeEnv->vnodeFileInfo.pFileInfo[fileIndex].fileID,
          compBlockSize, (et - st) / 1000.0);
 
   pSummary->totalCompInfoSize += compBlockSize;
@@ -524,8 +559,9 @@ static int32_t binarySearchForBlock(SQuery *pQuery, int64_t key) {
   return binarySearchForBlockImpl(pQuery->pBlock, pQuery->numOfBlocks, key, pQuery->order.order);
 }
 
+#if 0
 /* unmap previous buffer */
-static UNUSED_FUNC int32_t resetMMapWindow(SQueryFileInfo *pQueryFileInfo) {
+static UNUSED_FUNC int32_t resetMMapWindow(SHeaderFileInfo *pQueryFileInfo) {
   munmap(pQueryFileInfo->pDataFileData, pQueryFileInfo->defaultMappingSize);
 
   pQueryFileInfo->dtFileMappingOffset = 0;
@@ -539,7 +575,7 @@ static UNUSED_FUNC int32_t resetMMapWindow(SQueryFileInfo *pQueryFileInfo) {
   return 0;
 }
 
-static int32_t moveMMapWindow(SQueryFileInfo *pQueryFileInfo, uint64_t offset) {
+static int32_t moveMMapWindow(SHeaderFileInfo *pQueryFileInfo, uint64_t offset) {
   uint64_t upperBnd = (pQueryFileInfo->dtFileMappingOffset + pQueryFileInfo->defaultMappingSize - 1);
 
   /* data that are located in current mmapping window */
@@ -586,7 +622,7 @@ static int32_t moveMMapWindow(SQueryFileInfo *pQueryFileInfo, uint64_t offset) {
   return 0;
 }
 
-static int32_t copyDataFromMMapBuffer(int fd, SQInfo *pQInfo, SQueryFileInfo *pQueryFile, char *buf, uint64_t offset,
+static int32_t copyDataFromMMapBuffer(int fd, SQInfo *pQInfo, SHeaderFileInfo *pQueryFile, char *buf, uint64_t offset,
                                       int32_t size) {
   assert(size >= 0);
 
@@ -637,7 +673,9 @@ static int32_t copyDataFromMMapBuffer(int fd, SQInfo *pQInfo, SQueryFileInfo *pQ
   return 0;
 }
 
-static int32_t readDataFromDiskFile(int fd, SQInfo *pQInfo, SQueryFileInfo *pQueryFile, char *buf, uint64_t offset,
+#endif
+
+static int32_t readDataFromDiskFile(int fd, SQInfo *pQInfo, SQueryFilesInfo *pQueryFile, char *buf, uint64_t offset,
                                     int32_t size) {
   assert(size >= 0);
 
@@ -652,7 +690,7 @@ static int32_t readDataFromDiskFile(int fd, SQInfo *pQInfo, SQueryFileInfo *pQue
   return 0;
 }
 
-static int32_t loadColumnIntoMem(SQuery *pQuery, SQueryFileInfo *pQueryFileInfo, SCompBlock *pBlock, SField *pFields,
+static int32_t loadColumnIntoMem(SQuery *pQuery, SQueryFilesInfo *pQueryFileInfo, SCompBlock *pBlock, SField *pFields,
                                  int32_t col, SData *sdata, void *tmpBuf, char *buffer, int32_t buffersize) {
   char *dst = (pBlock->algorithm) ? tmpBuf : sdata->data;
 
@@ -660,14 +698,14 @@ static int32_t loadColumnIntoMem(SQuery *pQuery, SQueryFileInfo *pQueryFileInfo,
   SQInfo *pQInfo = (SQInfo *)GET_QINFO_ADDR(pQuery);
 
   int     fd = pBlock->last ? pQueryFileInfo->lastFd : pQueryFileInfo->dataFd;
-  int32_t ret = (*readDataFunctor[DEFAULT_IO_ENGINE])(fd, pQInfo, pQueryFileInfo, dst, offset, pFields[col].len);
+  int32_t ret = readDataFromDiskFile(fd, pQInfo, pQueryFileInfo, dst, offset, pFields[col].len);
   if (ret != 0) {
     return ret;
   }
 
   // load checksum
   TSCKSUM checksum = 0;
-  ret = (*readDataFunctor[DEFAULT_IO_ENGINE])(fd, pQInfo, pQueryFileInfo, (char *)&checksum, offset + pFields[col].len,
+  ret = readDataFromDiskFile(fd, pQInfo, pQueryFileInfo, (char *)&checksum, offset + pFields[col].len,
                                               sizeof(TSCKSUM));
   if (ret != 0) {
     return ret;
@@ -689,12 +727,12 @@ static int32_t loadColumnIntoMem(SQuery *pQuery, SQueryFileInfo *pQueryFileInfo,
   return 0;
 }
 
-static int32_t loadDataBlockFieldsInfo(SQueryRuntimeEnv *pRuntimeEnv, SQueryFileInfo *pQueryFileInfo,
-                                       SCompBlock *pBlock, SField **pField) {
+static int32_t loadDataBlockFieldsInfo(SQueryRuntimeEnv *pRuntimeEnv, SCompBlock *pBlock, SField **pField) {
   SQuery *   pQuery = pRuntimeEnv->pQuery;
   SQInfo *   pQInfo = (SQInfo *)GET_QINFO_ADDR(pQuery);
   SMeterObj *pMeterObj = pRuntimeEnv->pMeterObj;
-
+  SQueryFilesInfo *pVnodeFilesInfo = &pRuntimeEnv->vnodeFileInfo;
+  
   size_t size = sizeof(SField) * (pBlock->numOfCols) + sizeof(TSCKSUM);
 
   // if *pField != NULL, this block is loaded once, in current query do nothing
@@ -709,9 +747,8 @@ static int32_t loadDataBlockFieldsInfo(SQueryRuntimeEnv *pRuntimeEnv, SQueryFile
 
   int64_t st = taosGetTimestampUs();
 
-  int     fd = pBlock->last ? pQueryFileInfo->lastFd : pQueryFileInfo->dataFd;
-  int32_t ret =
-      (*readDataFunctor[DEFAULT_IO_ENGINE])(fd, pQInfo, pQueryFileInfo, (char *)(*pField), pBlock->offset, size);
+  int     fd = pBlock->last ? pVnodeFilesInfo->lastFd : pVnodeFilesInfo->dataFd;
+  int32_t ret = readDataFromDiskFile(fd, pQInfo, pVnodeFilesInfo, (char *)(*pField), pBlock->offset, size);
   if (ret != 0) {
     return ret;
   }
@@ -719,7 +756,7 @@ static int32_t loadDataBlockFieldsInfo(SQueryRuntimeEnv *pRuntimeEnv, SQueryFile
   // check fields integrity
   if (!taosCheckChecksumWhole((uint8_t *)(*pField), size)) {
     dLError("QInfo:%p vid:%d sid:%d id:%s, slot:%d, failed to read sfields, file:%s, sfields area broken:%lld", pQInfo,
-            pMeterObj->vnode, pMeterObj->sid, pMeterObj->meterId, pQuery->slot, pQueryFileInfo->dataFilePath,
+            pMeterObj->vnode, pMeterObj->sid, pMeterObj->meterId, pQuery->slot, pVnodeFilesInfo->dataFilePath,
             pBlock->offset);
     return -1;
   }
@@ -747,7 +784,8 @@ static int32_t loadDataBlockIntoMem(SCompBlock *pBlock, SField **pField, SQueryR
   SMeterObj *pMeterObj = pRuntimeEnv->pMeterObj;
   SData **   sdata = pRuntimeEnv->colDataBuffer;
 
-  SQueryFileInfo *pQueryFileInfo = &pRuntimeEnv->pVnodeFiles[fileIdx];
+  assert(fileIdx == pRuntimeEnv->vnodeFileInfo.current);
+  
   SData **        primaryTSBuf = &pRuntimeEnv->primaryColBuffer;
   void *          tmpBuf = pRuntimeEnv->unzipBuffer;
 
@@ -760,7 +798,7 @@ static int32_t loadDataBlockIntoMem(SCompBlock *pBlock, SField **pField, SQueryR
   }
 
   /* failed to load fields info, return with error info */
-  if (loadSField && (loadDataBlockFieldsInfo(pRuntimeEnv, pQueryFileInfo, pBlock, pField) != 0)) {
+  if (loadSField && (loadDataBlockFieldsInfo(pRuntimeEnv, pBlock, pField) != 0)) {
     return -1;
   }
 
@@ -775,7 +813,7 @@ static int32_t loadDataBlockIntoMem(SCompBlock *pBlock, SField **pField, SQueryR
     } else {
       columnBytes += (*pField)[PRIMARYKEY_TIMESTAMP_COL_INDEX].len + sizeof(TSCKSUM);
       int32_t ret =
-          loadColumnIntoMem(pQuery, pQueryFileInfo, pBlock, *pField, PRIMARYKEY_TIMESTAMP_COL_INDEX, *primaryTSBuf,
+          loadColumnIntoMem(pQuery, &pRuntimeEnv->vnodeFileInfo, pBlock, *pField, PRIMARYKEY_TIMESTAMP_COL_INDEX, *primaryTSBuf,
                             tmpBuf, pRuntimeEnv->secondaryUnzipBuffer, pRuntimeEnv->unzipBufSize);
       if (ret != 0) {
         return -1;
@@ -813,7 +851,7 @@ static int32_t loadDataBlockIntoMem(SCompBlock *pBlock, SField **pField, SQueryR
           fillWithNull(pQuery, sdata[i]->data, i, pBlock->numOfPoints);
         } else {
           columnBytes += (*pField)[j].len + sizeof(TSCKSUM);
-          ret = loadColumnIntoMem(pQuery, pQueryFileInfo, pBlock, *pField, j, sdata[i], tmpBuf,
+          ret = loadColumnIntoMem(pQuery, &pRuntimeEnv->vnodeFileInfo, pBlock, *pField, j, sdata[i], tmpBuf,
                                   pRuntimeEnv->secondaryUnzipBuffer, pRuntimeEnv->unzipBufSize);
 
           pSummary->numOfSeek++;
@@ -1763,23 +1801,25 @@ static int32_t applyFunctionsOnBlock(SQueryRuntimeEnv *pRuntimeEnv, SBlockInfo *
 }
 
 int32_t vnodeGetVnodeHeaderFileIdx(int32_t *fid, SQueryRuntimeEnv *pRuntimeEnv, int32_t order) {
-  if (pRuntimeEnv->numOfFiles == 0) {
+  if (pRuntimeEnv->vnodeFileInfo.numOfFiles == 0) {
     return -1;
   }
 
+  SQueryFilesInfo* pVnodeFiles = &pRuntimeEnv->vnodeFileInfo;
+  
   /* set the initial file for current query */
-  if (order == TSQL_SO_ASC && *fid < pRuntimeEnv->pVnodeFiles[0].fileID) {
-    *fid = pRuntimeEnv->pVnodeFiles[0].fileID;
+  if (order == TSQL_SO_ASC && *fid < pVnodeFiles->pFileInfo[0].fileID) {
+    *fid = pVnodeFiles->pFileInfo[0].fileID;
     return 0;
-  } else if (order == TSQL_SO_DESC && *fid > pRuntimeEnv->pVnodeFiles[pRuntimeEnv->numOfFiles - 1].fileID) {
-    *fid = pRuntimeEnv->pVnodeFiles[pRuntimeEnv->numOfFiles - 1].fileID;
-    return pRuntimeEnv->numOfFiles - 1;
+  } else if (order == TSQL_SO_DESC && *fid > pVnodeFiles->pFileInfo[pVnodeFiles->numOfFiles - 1].fileID) {
+    *fid = pVnodeFiles->pFileInfo[pVnodeFiles->numOfFiles - 1].fileID;
+    return pVnodeFiles->numOfFiles - 1;
   }
 
-  int32_t numOfFiles = pRuntimeEnv->numOfFiles;
+  int32_t numOfFiles = pVnodeFiles->numOfFiles;
 
-  if (order == TSQL_SO_DESC && *fid > pRuntimeEnv->pVnodeFiles[numOfFiles - 1].fileID) {
-    *fid = pRuntimeEnv->pVnodeFiles[numOfFiles - 1].fileID;
+  if (order == TSQL_SO_DESC && *fid > pVnodeFiles->pFileInfo[numOfFiles - 1].fileID) {
+    *fid = pVnodeFiles->pFileInfo[numOfFiles - 1].fileID;
     return numOfFiles - 1;
   }
 
@@ -1787,12 +1827,12 @@ int32_t vnodeGetVnodeHeaderFileIdx(int32_t *fid, SQueryRuntimeEnv *pRuntimeEnv,
     int32_t i = 0;
     int32_t step = 1;
 
-    while (i<numOfFiles && * fid> pRuntimeEnv->pVnodeFiles[i].fileID) {
+    while (i<numOfFiles && * fid> pVnodeFiles->pFileInfo[i].fileID) {
       i += step;
     }
 
-    if (i < numOfFiles && *fid <= pRuntimeEnv->pVnodeFiles[i].fileID) {
-      *fid = pRuntimeEnv->pVnodeFiles[i].fileID;
+    if (i < numOfFiles && *fid <= pVnodeFiles->pFileInfo[i].fileID) {
+      *fid = pVnodeFiles->pFileInfo[i].fileID;
       return i;
     } else {
       return -1;
@@ -1801,12 +1841,12 @@ int32_t vnodeGetVnodeHeaderFileIdx(int32_t *fid, SQueryRuntimeEnv *pRuntimeEnv,
     int32_t i = numOfFiles - 1;
     int32_t step = -1;
 
-    while (i >= 0 && *fid < pRuntimeEnv->pVnodeFiles[i].fileID) {
+    while (i >= 0 && *fid < pVnodeFiles->pFileInfo[i].fileID) {
       i += step;
     }
 
-    if (i >= 0 && *fid >= pRuntimeEnv->pVnodeFiles[i].fileID) {
-      *fid = pRuntimeEnv->pVnodeFiles[i].fileID;
+    if (i >= 0 && *fid >= pVnodeFiles->pFileInfo[i].fileID) {
+      *fid = pVnodeFiles->pFileInfo[i].fileID;
       return i;
     } else {
       return -1;
@@ -2137,24 +2177,11 @@ static void teardownQueryRuntimeEnv(SQueryRuntimeEnv *pRuntimeEnv) {
     tfree(pRuntimeEnv->primaryColBuffer);
   }
 
-  for (int32_t i = 0; i < pRuntimeEnv->numOfFiles; ++i) {
-    SQueryFileInfo *pQFileInfo = &(pRuntimeEnv->pVnodeFiles[i]);
-    if (pQFileInfo->pHeaderFileData != NULL && pQFileInfo->pHeaderFileData != MAP_FAILED) {
-      munmap(pQFileInfo->pHeaderFileData, pQFileInfo->headFileSize);
-    }
-    tclose(pQFileInfo->headerFd);
-
-    if (pQFileInfo->pDataFileData != NULL && pQFileInfo->pDataFileData != MAP_FAILED) {
-      munmap(pQFileInfo->pDataFileData, pQFileInfo->defaultMappingSize);
-    }
+  doCloseOpenedFileData(&pRuntimeEnv->vnodeFileInfo);
 
-    tclose(pQFileInfo->dataFd);
-    tclose(pQFileInfo->lastFd);
-  }
-
-  if (pRuntimeEnv->pVnodeFiles != NULL) {
-    pRuntimeEnv->numOfFiles = 0;
-    free(pRuntimeEnv->pVnodeFiles);
+  if (pRuntimeEnv->vnodeFileInfo.pFileInfo != NULL) {
+    pRuntimeEnv->vnodeFileInfo.numOfFiles = 0;
+    free(pRuntimeEnv->vnodeFileInfo.pFileInfo);
   }
 
   if (pRuntimeEnv->pInterpoBuf != NULL) {
@@ -2962,8 +2989,8 @@ bool vnodeParametersSafetyCheck(SQuery *pQuery) {
 }
 
 static int file_order_comparator(const void *p1, const void *p2) {
-  SQueryFileInfo *pInfo1 = (SQueryFileInfo *)p1;
-  SQueryFileInfo *pInfo2 = (SQueryFileInfo *)p2;
+  SHeaderFileInfo *pInfo1 = (SHeaderFileInfo *)p1;
+  SHeaderFileInfo *pInfo2 = (SHeaderFileInfo *)p2;
 
   if (pInfo1->fileID == pInfo2->fileID) {
     return 0;
@@ -2983,24 +3010,17 @@ static int file_order_comparator(const void *p1, const void *p2) {
  * @param prefix
  * @return
  */
-static int32_t vnodeOpenVnodeDBFiles(SQueryFileInfo *pVnodeFiles, int32_t fid, int32_t vnodeId, char *fileName,
-      char *prefix) {
+static int32_t vnodeOpenVnodeDBFiles(SQueryFilesInfo *pVnodeFiles, int32_t fid, int32_t index, char *fileName) {
+  SHeaderFileInfo *pFileInfo = &pVnodeFiles->pFileInfo[index];
   
-  pVnodeFiles->fileID = fid;
-  pVnodeFiles->defaultMappingSize = DEFAULT_DATA_FILE_MMAP_WINDOW_SIZE;
+  pFileInfo->fileID = fid;
 
-  snprintf(pVnodeFiles->headerFilePath, PATH_MAX, "%s%s", prefix, fileName);
+  char buf[PATH_MAX] = {0};
+  snprintf(buf, PATH_MAX, "%s%s", pVnodeFiles->dbFilePathPrefix, fileName);
 
   struct stat fstat = {0};
-  if (stat(pVnodeFiles->headerFilePath, &fstat) < 0) return -1;
-  pVnodeFiles->headFileSize = fstat.st_size;
-
-  snprintf(pVnodeFiles->dataFilePath, PATH_MAX, "%sv%df%d.data", prefix, vnodeId, fid);
-  snprintf(pVnodeFiles->lastFilePath, PATH_MAX, "%sv%df%d.last", prefix, vnodeId, fid);
-  
-  pVnodeFiles->headerFd = FD_INITIALIZER;
-  pVnodeFiles->dataFd = FD_INITIALIZER;
-  pVnodeFiles->lastFd = FD_INITIALIZER;
+  if (stat(buf, &fstat) < 0) return -1;
+  pFileInfo->headFileSize = fstat.st_size;
 
 #if DEFAULT_IO_ENGINE == IO_ENGINE_MMAP
   /* enforce kernel to preload data when the file is mapping */
@@ -3035,23 +3055,23 @@ _clean:
 #endif
 }
 
-static void vnodeOpenAllFiles(SQInfo *pQInfo, int32_t vnodeId) {
-  char dbFilePathPrefix[TSDB_FILENAME_LEN] = {0};
-
-  sprintf(dbFilePathPrefix, "%s/vnode%d/db/", tsDirectory, vnodeId);
-  DIR *pDir = opendir(dbFilePathPrefix);
-  if (pDir == NULL) {
-    dError("QInfo:%p failed to open directory:%s", pQInfo, dbFilePathPrefix);
-    return;
-  }
-
+static void vnodeRecordAllFiles(SQInfo *pQInfo, int32_t vnodeId) {
   char suffix[] = ".head";
 
   struct dirent *pEntry = NULL;
   size_t         alloc = 4;  // default allocated size
 
-  SQueryRuntimeEnv *pRuntimeEnv = &(pQInfo->pMeterQuerySupporter->runtimeEnv);
-  pRuntimeEnv->pVnodeFiles = calloc(1, sizeof(SQueryFileInfo) * alloc);
+  SQueryFilesInfo *pVnodeFilesInfo = &(pQInfo->pMeterQuerySupporter->runtimeEnv.vnodeFileInfo);
+  pVnodeFilesInfo->vnodeId = vnodeId;
+  
+  sprintf(pVnodeFilesInfo->dbFilePathPrefix, "%s/vnode%d/db/", tsDirectory, vnodeId);
+  DIR *pDir = opendir(pVnodeFilesInfo->dbFilePathPrefix);
+  if (pDir == NULL) {
+    dError("QInfo:%p failed to open directory:%s", pQInfo, pVnodeFilesInfo->dbFilePathPrefix);
+    return;
+  }
+
+  pVnodeFilesInfo->pFileInfo = calloc(1, sizeof(SHeaderFileInfo) * alloc);
   SVnodeObj *pVnode = &vnodeList[vnodeId];
 
   while ((pEntry = readdir(pDir)) != NULL) {
@@ -3085,26 +3105,28 @@ static void vnodeOpenAllFiles(SQInfo *pQInfo, int32_t vnodeId) {
 
     assert(fid >= 0 && vid >= 0);
 
-    if (++pRuntimeEnv->numOfFiles > alloc) {
-      alloc = alloc << 1;
-      pRuntimeEnv->pVnodeFiles = realloc(pRuntimeEnv->pVnodeFiles, alloc * sizeof(SQueryFileInfo));
-      memset(&pRuntimeEnv->pVnodeFiles[alloc >> 1], 0, (alloc >> 1) * sizeof(SQueryFileInfo));
+    if (++pVnodeFilesInfo->numOfFiles > alloc) {
+      alloc = alloc << 1U;
+      pVnodeFilesInfo->pFileInfo = realloc(pVnodeFilesInfo->pFileInfo, alloc * sizeof(SHeaderFileInfo));
+      memset(&pVnodeFilesInfo->pFileInfo[alloc >> 1U], 0, (alloc >> 1U) * sizeof(SHeaderFileInfo));
     }
 
-    SQueryFileInfo *pVnodeFiles = &pRuntimeEnv->pVnodeFiles[pRuntimeEnv->numOfFiles - 1];
-    int32_t         ret = vnodeOpenVnodeDBFiles(pVnodeFiles, fid, vnodeId, pEntry->d_name, dbFilePathPrefix);
+    SHeaderFileInfo *pVnodeFiles = &pVnodeFilesInfo->pFileInfo[pVnodeFilesInfo->numOfFiles - 1];
+    
+    int32_t ret = vnodeOpenVnodeDBFiles(pVnodeFilesInfo, fid, pVnodeFilesInfo->numOfFiles - 1, pEntry->d_name);
     if (ret < 0) {
-      memset(pVnodeFiles, 0, sizeof(SQueryFileInfo));  // reset information
-      pRuntimeEnv->numOfFiles -= 1;
+      memset(pVnodeFiles, 0, sizeof(SHeaderFileInfo));  // reset information
+      pVnodeFilesInfo->numOfFiles -= 1;
     }
   }
 
   closedir(pDir);
 
-  dTrace("QInfo:%p find %d data files in %s to be checked", pQInfo, pRuntimeEnv->numOfFiles, dbFilePathPrefix);
+  dTrace("QInfo:%p find %d data files in %s to be checked", pQInfo, pVnodeFilesInfo->numOfFiles,
+      pVnodeFilesInfo->dbFilePathPrefix);
 
   /* order the files information according their names */
-  qsort(pRuntimeEnv->pVnodeFiles, (size_t)pRuntimeEnv->numOfFiles, sizeof(SQueryFileInfo), file_order_comparator);
+  qsort(pVnodeFilesInfo->pFileInfo, (size_t)pVnodeFilesInfo->numOfFiles, sizeof(SHeaderFileInfo), file_order_comparator);
 }
 
 static void updateOffsetVal(SQueryRuntimeEnv *pRuntimeEnv, SBlockInfo *pBlockInfo, void *pBlock) {
@@ -3686,7 +3708,8 @@ int32_t vnodeQuerySingleMeterPrepare(SQInfo *pQInfo, SMeterObj *pMeterObj, SMete
   // dataInCache requires lastKey value
   pQuery->lastKey = pQuery->skey;
 
-  pSupporter->runtimeEnv.mmapedHFileIndex = -1;  // set the initial value
+  doInitQueryFileInfoFD(&pSupporter->runtimeEnv.vnodeFileInfo);
+  
   vnodeInitDataBlockInfo(&pSupporter->runtimeEnv.loadBlockInfo);
   vnodeInitLoadCompBlockInfo(&pSupporter->runtimeEnv.loadCompBlockInfo);
 
@@ -3719,7 +3742,7 @@ int32_t vnodeQuerySingleMeterPrepare(SQInfo *pQInfo, SMeterObj *pMeterObj, SMete
     return ret;
   }
 
-  vnodeOpenAllFiles(pQInfo, pMeterObj->vnode);
+  vnodeRecordAllFiles(pQInfo, pMeterObj->vnode);
 
   if (isGroupbyNormalCol(pQuery->pGroupbyExpr)) {
     if ((ret = allocateOutputBufForGroup(pSupporter, pQuery, false)) != TSDB_CODE_SUCCESS) {
@@ -3855,8 +3878,8 @@ int32_t vnodeMultiMeterQueryPrepare(SQInfo *pQInfo, SQuery *pQuery, void *param)
   pQuery->pointsRead = 0;
 
   changeExecuteScanOrder(pQuery, true);
-
-  pSupporter->runtimeEnv.mmapedHFileIndex = -1;  // set the initial value
+  
+  doInitQueryFileInfoFD(&pSupporter->runtimeEnv.vnodeFileInfo);
   vnodeInitDataBlockInfo(&pSupporter->runtimeEnv.loadBlockInfo);
   vnodeInitLoadCompBlockInfo(&pSupporter->runtimeEnv.loadCompBlockInfo);
 
@@ -3897,7 +3920,7 @@ int32_t vnodeMultiMeterQueryPrepare(SQInfo *pQInfo, SQuery *pQuery, void *param)
   }
 
   tSidSetSort(pSupporter->pSidSet);
-  vnodeOpenAllFiles(pQInfo, pMeter->vnode);
+  vnodeRecordAllFiles(pQInfo, pMeter->vnode);
 
   if ((ret = allocateOutputBufForGroup(pSupporter, pQuery, true)) != TSDB_CODE_SUCCESS) {
     return ret;
@@ -4038,7 +4061,7 @@ TSKEY getTimestampInDiskBlock(SQueryRuntimeEnv *pRuntimeEnv, int32_t index) {
 
   // the fields info is not loaded, load it into memory
   if (pQuery->pFields == NULL || pQuery->pFields[pQuery->slot] == NULL) {
-    loadDataBlockFieldsInfo(pRuntimeEnv, &pRuntimeEnv->pVnodeFiles[fileIndex], pBlock, &pQuery->pFields[pQuery->slot]);
+    loadDataBlockFieldsInfo(pRuntimeEnv, pBlock, &pQuery->pFields[pQuery->slot]);
   }
 
   SET_DATA_BLOCK_LOADED(pRuntimeEnv->blockStatus);
@@ -5533,7 +5556,8 @@ SMeterDataInfo **vnodeFilterQualifiedMeters(SQInfo *pQInfo, int32_t vid, int32_t
   SMeterQuerySupportObj *pSupporter = pQInfo->pMeterQuerySupporter;
   SMeterSidExtInfo **    pMeterSidExtInfo = pSupporter->pMeterSidExtInfo;
   SQueryRuntimeEnv *     pRuntimeEnv = &pSupporter->runtimeEnv;
-  SQueryFileInfo *       pQueryFileInfo = &pRuntimeEnv->pVnodeFiles[fileIndex];
+  
+  SHeaderFileInfo *      pQueryFileInfo = &pRuntimeEnv->vnodeFileInfo.pFileInfo[fileIndex];
 
   SVnodeObj *pVnode = &vnodeList[vid];
 
@@ -5545,7 +5569,7 @@ SMeterDataInfo **vnodeFilterQualifiedMeters(SQInfo *pQInfo, int32_t vid, int32_t
   int32_t tmsize = sizeof(SCompHeader) * (pVnode->cfg.maxSessions) + sizeof(TSCKSUM);
 
   // file is corrupted, abort query in current file
-  if (validateHeaderOffsetSegment(pQInfo, pQueryFileInfo->headerFilePath, vid, pHeaderFileData, tmsize) < 0) {
+  if (validateHeaderOffsetSegment(pQInfo, pRuntimeEnv->vnodeFileInfo.headerFilePath, vid, pHeaderFileData, tmsize) < 0) {
     *numOfMeters = 0;
     return 0;
   }
@@ -5835,7 +5859,7 @@ static bool setCurrentQueryRange(SMeterDataInfo *pMeterDataInfo, SQuery *pQuery,
  * @return
  */
 uint32_t getDataBlocksForMeters(SMeterQuerySupportObj *pSupporter, SQuery *pQuery, char *pHeaderData,
-                                int32_t numOfMeters, SQueryFileInfo *pQueryFileInfo, SMeterDataInfo **pMeterDataInfo) {
+                                int32_t numOfMeters, const char* filePath, SMeterDataInfo **pMeterDataInfo) {
   uint32_t           numOfBlocks = 0;
   SQInfo *           pQInfo = (SQInfo *)GET_QINFO_ADDR(pQuery);
   SQueryCostSummary *pSummary = &pSupporter->runtimeEnv.summary;
@@ -5847,7 +5871,7 @@ uint32_t getDataBlocksForMeters(SMeterQuerySupportObj *pSupporter, SQuery *pQuer
     SMeterObj *pMeterObj = pMeterDataInfo[j]->pMeterObj;
 
     SCompInfo *compInfo = (SCompInfo *)(pHeaderData + pMeterDataInfo[j]->offsetInHeaderFile);
-    int32_t    ret = validateCompBlockInfoSegment(pQInfo, pQueryFileInfo->headerFilePath, pMeterObj->vnode, compInfo,
+    int32_t    ret = validateCompBlockInfoSegment(pQInfo, filePath, pMeterObj->vnode, compInfo,
                                                pMeterDataInfo[j]->offsetInHeaderFile);
     if (ret != 0) {
       clearMeterDataBlockInfo(pMeterDataInfo[j]);
@@ -5866,8 +5890,7 @@ uint32_t getDataBlocksForMeters(SMeterQuerySupportObj *pSupporter, SQuery *pQuer
 
     // check compblock integrity
     TSCKSUM checksum = *(TSCKSUM *)((char *)compInfo + sizeof(SCompInfo) + size);
-    ret = validateCompBlockSegment(pQInfo, pQueryFileInfo->headerFilePath, compInfo, (char *)pCompBlock,
-                                   pMeterObj->vnode, checksum);
+    ret = validateCompBlockSegment(pQInfo, filePath, compInfo, (char *)pCompBlock, pMeterObj->vnode, checksum);
     if (ret < 0) {
       clearMeterDataBlockInfo(pMeterDataInfo[j]);
       continue;
@@ -6540,7 +6563,7 @@ int32_t LoadDatablockOnDemand(SCompBlock *pBlock, SField **pFields, uint8_t *blk
                               int32_t fileIdx, int32_t slotIdx, __block_search_fn_t searchFn, bool onDemand) {
   SQuery *        pQuery = pRuntimeEnv->pQuery;
   SMeterObj *     pMeterObj = pRuntimeEnv->pMeterObj;
-  SQueryFileInfo *pQueryFileInfo = &pRuntimeEnv->pVnodeFiles[fileIdx];
+  SHeaderFileInfo *pQueryFileInfo = &pRuntimeEnv->vnodeFileInfo.pFileInfo[fileIdx];
 
   TSKEY *primaryKeys = (TSKEY *)pRuntimeEnv->primaryColBuffer->data;
 
@@ -6575,7 +6598,7 @@ int32_t LoadDatablockOnDemand(SCompBlock *pBlock, SField **pFields, uint8_t *blk
 
       setTimestampRange(pRuntimeEnv, pBlock->keyFirst, pBlock->keyLast);
     } else if (req == BLK_DATA_FILEDS_NEEDED) {
-      if (loadDataBlockFieldsInfo(pRuntimeEnv, pQueryFileInfo, pBlock, pFields) < 0) {
+      if (loadDataBlockFieldsInfo(pRuntimeEnv, pBlock, pFields) < 0) {
         return DISK_DATA_LOAD_FAILED;
       }
     } else {
@@ -6584,7 +6607,7 @@ int32_t LoadDatablockOnDemand(SCompBlock *pBlock, SField **pFields, uint8_t *blk
     }
   } else {
   _load_all:
-    if (loadDataBlockFieldsInfo(pRuntimeEnv, pQueryFileInfo, pBlock, pFields) < 0) {
+    if (loadDataBlockFieldsInfo(pRuntimeEnv, pBlock, pFields) < 0) {
       return DISK_DATA_LOAD_FAILED;
     }
 
diff --git a/src/system/detail/src/vnodeQueryProcess.c b/src/system/detail/src/vnodeQueryProcess.c
index b1398f7a4a0223c43f4b4848daeccfb65f61af50..e73c96d04c73cdac622dcd83889a7b09f086865a 100644
--- a/src/system/detail/src/vnodeQueryProcess.c
+++ b/src/system/detail/src/vnodeQueryProcess.c
@@ -266,7 +266,9 @@ static SMeterDataInfo *queryOnMultiDataFiles(SQInfo *pQInfo, SMeterDataInfo *pMe
   __block_search_fn_t searchFn = vnodeSearchKeyFunc[pTempMeter->searchAlgorithm];
 
   int32_t vnodeId = pTempMeter->vnode;
-  dTrace("QInfo:%p start to check data blocks in %d files", pQInfo, pRuntimeEnv->numOfFiles);
+  SQueryFilesInfo* pVnodeFileInfo = &pRuntimeEnv->vnodeFileInfo;
+  
+  dTrace("QInfo:%p start to check data blocks in %d files", pQInfo, pVnodeFileInfo->numOfFiles);
 
   int32_t            fid = QUERY_IS_ASC_QUERY(pQuery) ? -1 : INT32_MAX;
   int32_t            step = GET_FORWARD_DIRECTION_FACTOR(pQuery->order.order);
@@ -289,9 +291,8 @@ static SMeterDataInfo *queryOnMultiDataFiles(SQInfo *pQInfo, SMeterDataInfo *pMe
     pQuery->fileId = fid;
     pSummary->numOfFiles++;
 
-    SQueryFileInfo *pQueryFileInfo = &pRuntimeEnv->pVnodeFiles[fileIdx];
-    char *pHeaderData = vnodeGetHeaderFileData(pRuntimeEnv, vnodeId, fileIdx);
-    if (pHeaderData == NULL) { // failed to mmap header file into buffer, ignore current file, try next
+    char *pHeaderFileData = vnodeGetHeaderFileData(pRuntimeEnv, vnodeId, fileIdx);
+    if (pHeaderFileData == NULL) { // failed to mmap header file into buffer, ignore current file, try next
       fid += step;
       continue;
     }
@@ -308,20 +309,21 @@ static SMeterDataInfo *queryOnMultiDataFiles(SQInfo *pQInfo, SMeterDataInfo *pMe
       return NULL;
     }
 
-    dTrace("QInfo:%p file:%s, %d meters qualified", pQInfo, pQueryFileInfo->dataFilePath, numOfQualifiedMeters);
+    dTrace("QInfo:%p file:%s, %d meters qualified", pQInfo, pVnodeFileInfo->dataFilePath, numOfQualifiedMeters);
     
-    // none of meters in query set have pHeaderData in this file, try next file
+    // none of meters in query set have pHeaderFileData in this file, try next file
     if (numOfQualifiedMeters == 0) {
       fid += step;
       tfree(pReqMeterDataInfo);
       continue;
     }
 
-    uint32_t numOfBlocks = getDataBlocksForMeters(pSupporter, pQuery, pHeaderData, numOfQualifiedMeters, pQueryFileInfo,
-                                                  pReqMeterDataInfo);
+    uint32_t numOfBlocks = getDataBlocksForMeters(pSupporter, pQuery, pHeaderFileData, numOfQualifiedMeters,
+        pVnodeFileInfo->headerFilePath, pReqMeterDataInfo);
 
-    dTrace("QInfo:%p file:%s, %d meters contains %d blocks to be checked", pQInfo, pQueryFileInfo->dataFilePath,
+    dTrace("QInfo:%p file:%s, %d meters contains %d blocks to be checked", pQInfo, pVnodeFileInfo->dataFilePath,
            numOfQualifiedMeters, numOfBlocks);
+    
     if (numOfBlocks == 0) {
       fid += step;
       tfree(pReqMeterDataInfo);
@@ -346,7 +348,7 @@ static SMeterDataInfo *queryOnMultiDataFiles(SQInfo *pQInfo, SMeterDataInfo *pMe
 
     totalBlocks += numOfBlocks;
 
-    // sequentially scan the pHeaderData file
+    // sequentially scan the pHeaderFileData file
     int32_t j = QUERY_IS_ASC_QUERY(pQuery) ? 0 : numOfBlocks - 1;
 
     for (; j < numOfBlocks && j >= 0; j += step) {
@@ -428,7 +430,7 @@ static SMeterDataInfo *queryOnMultiDataFiles(SQInfo *pQInfo, SMeterDataInfo *pMe
   }
 
   int64_t time = taosGetTimestampUs() - st;
-  dTrace("QInfo:%p complete check %d files, %d blocks, elapsed time:%.3fms", pQInfo, pRuntimeEnv->numOfFiles,
+  dTrace("QInfo:%p complete check %d files, %d blocks, elapsed time:%.3fms", pQInfo, pVnodeFileInfo->numOfFiles,
          totalBlocks, time / 1000.0);
 
   pSummary->fileTimeUs += time;