diff --git a/source/libs/stream/src/streamSnapshot.c b/source/libs/stream/src/streamSnapshot.c
index d6dd4dccc8..4d116efe0f 100644
--- a/source/libs/stream/src/streamSnapshot.c
+++ b/source/libs/stream/src/streamSnapshot.c
@@ -14,6 +14,7 @@
  */
 
 #include "streamSnapshot.h"
+#include "query.h"
 #include "rocksdb/c.h"
 #include "tcommon.h"
 
@@ -26,8 +27,9 @@ enum SBackendFileType {
 };
 
 typedef struct SBackendFileItem {
-  char*  name;
-  int8_t type;
+  char*   name;
+  int8_t  type;
+  int64_t size;
 } SBackendFileItem;
 typedef struct SBackendFile {
   char*   pCurrent;
@@ -54,6 +56,7 @@ struct SStreamSnapBlockHdr {
   int64_t index;
   char    name[128];
   int64_t size;
+  int64_t totalSize;
   uint8_t data[];
 };
 struct SStreamSnapReader {
@@ -127,25 +130,30 @@ int32_t streamSnapHandleInit(SStreamSnapHandle* handle, char* path) {
   // current
   item.name = pFile->pCurrent;
   item.type = ROCKSDB_CURRENT_TYPE;
+  taosStatFile(pFile->pCurrent, &item.size, NULL);
   taosArrayPush(list, &item);
   // mainfest
   item.name = pFile->pMainfest;
   item.type = ROCKSDB_MAINFEST_TYPE;
+  taosStatFile(pFile->pMainfest, &item.size, NULL);
   taosArrayPush(list, &item);
   // options
   item.name = pFile->pOptions;
   item.type = ROCKSDB_OPTIONS_TYPE;
+  taosStatFile(pFile->pOptions, &item.size, NULL);
   taosArrayPush(list, &item);
   // sst
   for (int i = 0; i < taosArrayGetSize(pFile->pSst); i++) {
     char* sst = taosArrayGetP(pFile->pSst, i);
     item.name = sst;
     item.type = ROCKSDB_SST_TYPE;
+    taosStatFile(sst, &item.size, NULL);
     taosArrayPush(list, &item);
   }
   // meta
   item.name = pFile->pCheckpointMeta;
   item.type = ROCKSDB_CHECKPOINT_META_TYPE;
+  taosStatFile(pFile->pCheckpointMeta, &item.size, NULL);
   taosArrayPush(list, &item);
 
   handle->pBackendFile = pFile;
@@ -209,30 +217,43 @@ int32_t streamSnapReaderClose(SStreamSnapReader* pReader) {
 }
 int32_t streamSnapRead(SStreamSnapReader* pReader, uint8_t** ppData, int64_t* size) {
   // impl later
+  int32_t            code = 0;
   SStreamSnapHandle* pHandle = &pReader->handle;
   SBackendFileItem*  item = taosArrayGet(pHandle->pFileList, pHandle->currFileIdx);
 
   uint8_t* buf = taosMemoryCalloc(1, sizeof(SStreamSnapBlockHdr) + kBlockSize);
-  int64_t  nread = taosReadFile(pHandle->fd, buf + sizeof(SStreamSnapBlockHdr), kBlockSize);
+  int64_t  nread = taosPReadFile(pHandle->fd, buf + sizeof(SStreamSnapBlockHdr), kBlockSize, pHandle->offset);
   if (nread == -1) {
+    code = TAOS_SYSTEM_ERROR(terrno);
+    qError("stream snap failed to read snap, file name:%s, reason:%s", item->name, tstrerror(code));
+    return code;
     // handle later
     return -1;
+  } else if (nread <= kBlockSize) {
+    // left bytes less than kBlockSize
+    pHandle->offset += nread;
+    if (pHandle->offset >= item->size || nread < kBlockSize) {
+      taosCloseFile(&pHandle->fd);
+      pHandle->currFileIdx += 1;
+    }
   } else {
-    taosCloseFile(&pHandle->fd);
-    pHandle->currFileIdx += 1;
     if (pHandle->currFileIdx >= taosArrayGetSize(pHandle->pFileList)) {
       // finish
       return 0;
     }
     item = taosArrayGet(pHandle->pFileList, pHandle->currFileIdx);
+
+    pHandle->offset = 0;
     pHandle->fd = taosOpenFile(item->name, TD_FILE_READ);
     // handle err later
     nread = taosReadFile(pHandle->fd, buf + sizeof(SStreamSnapBlockHdr), kBlockSize);
+    pHandle->offset += nread;
   }
 
   SStreamSnapBlockHdr* pHdr = (SStreamSnapBlockHdr*)buf;
   pHdr->size = nread;
   pHdr->type = item->type;
+  pHdr->totalSize = item->size;
 
   memcpy(pHdr->name, item->name, strlen(item->name));
   pHandle->seraial += nread;
@@ -264,18 +285,25 @@ int32_t streamSnapWriterOpen(void* pMeta, int64_t sver, int64_t ever, SStreamSna
 
   handle->pFileList = list;
   handle->currFileIdx = 0;
+  handle->offset = 0;
   handle->fd = taosOpenFile(taosArrayGet(handle->pFileList, handle->currFileIdx), TD_FILE_WRITE);
   *ppWriter = pWriter;
   return 0;
 }
 
 int32_t streamSnapWrite(SStreamSnapWriter* pWriter, uint8_t* pData, uint32_t nData) {
-  SStreamSnapBlockHdr* pHdr = (SStreamSnapBlockHdr*)pData;
+  int32_t code = 0;
 
-  SStreamSnapHandle* handle = &pWriter->handle;
-  SBackendFileItem*  pItem = taosArrayGetP(handle->pFileList, handle->currFileIdx);
+  SStreamSnapBlockHdr* pHdr = (SStreamSnapBlockHdr*)pData;
+  SStreamSnapHandle*   handle = &pWriter->handle;
+  SBackendFileItem*    pItem = taosArrayGetP(handle->pFileList, handle->currFileIdx);
   if (strlen(pHdr->name) == strlen(pItem->name) && strcmp(pHdr->name, pItem->name) == 0) {
-    taosWriteFile(handle->fd, pHdr->data, pHdr->size);
+    if (taosPWriteFile(handle->fd, pHdr->data, pHdr->size, handle->offset) != pHdr->size) {
+      code = TAOS_SYSTEM_ERROR(terrno);
+      qError("stream snap failed to write snap, file name:%s, reason:%s", pHdr->name, tstrerror(code));
+      return code;
+    }
+    handle->offset += pHdr->size;
   } else {
     taosCloseFile(&handle->fd);
 
@@ -284,9 +312,12 @@ int32_t streamSnapWrite(SStreamSnapWriter* pWriter, uint8_t* pData, uint32_t nDa
     item.type = pHdr->type;
     taosArrayPush(handle->pFileList, &item);
 
-    handle->fd = taosOpenFile(taosArrayGet(handle->pFileList, taosArrayGetSize(handle->pFileList) - 1), TD_FILE_WRITE);
-    taosWriteFile(handle->fd, pHdr->data, pHdr->size);
+    handle->offset = 0;
     handle->currFileIdx += 1;
+    handle->fd = taosOpenFile(taosArrayGet(handle->pFileList, taosArrayGetSize(handle->pFileList) - 1), TD_FILE_WRITE);
+
+    taosPWriteFile(handle->fd, pHdr->data, pHdr->size, handle->offset);
+    handle->offset += pHdr->size;
   }
 
   // impl later