diff --git a/source/dnode/vnode/src/tsdb/tsdbReaderWriter.c b/source/dnode/vnode/src/tsdb/tsdbReaderWriter.c
index a6141311cf..cd2c6e7051 100644
--- a/source/dnode/vnode/src/tsdb/tsdbReaderWriter.c
+++ b/source/dnode/vnode/src/tsdb/tsdbReaderWriter.c
@@ -18,9 +18,12 @@
 #define TSDB_DEFAULT_PAGE_SIZE 4096
 
 // =============== PAGE-WISE FILE ===============
-#define PAGE_CONTENT_SIZE(SIZE)   ((SIZE) - sizeof(TSCKSUM))
-#define PAGE_OFFSET(PGNO, SIZE)   (((PGNO)-1) * (SIZE))
-#define OFFSET_PGNO(OFFSET, SIZE) ((OFFSET) / (SIZE) + 1)
+#define PAGE_CONTENT_SIZE(PAGE) ((PAGE) - sizeof(TSCKSUM))
+#define LOGIC_TO_FILE_OFFSET(OFFSET, PAGE) \
+  ((OFFSET) / PAGE_CONTENT_SIZE(PAGE) * (PAGE) + (OFFSET) % PAGE_CONTENT_SIZE(PAGE))
+#define FILE_TO_LOGIC_OFFSET(OFFSET, PAGE) ((OFFSET) / (PAGE)*PAGE_CONTENT_SIZE(PAGE) + (OFFSET) % (PAGE))
+#define PAGE_OFFSET(PGNO, PAGE)            (((PGNO)-1) * (PAGE))
+#define OFFSET_PGNO(OFFSET, PAGE)          ((OFFSET) / (PAGE) + 1)
 
 static int32_t tsdbOpenFile(const char *path, int32_t szPage, int32_t flag, STsdbFD **ppFD) {
   int32_t  code = 0;
@@ -140,16 +143,17 @@ _exit:
   return code;
 }
 
-static int32_t tsdbReadFile(STsdbFD *pFD, int64_t offset, uint8_t *pBuf, int64_t count) {
+static int32_t tsdbReadFile(STsdbFD *pFD, int64_t offset, uint8_t *pBuf, int64_t size) {
   int32_t code = 0;
   int64_t n;
-  int64_t pgno = OFFSET_PGNO(offset, pFD->szPage);
+  int64_t fOffset = LOGIC_TO_FILE_OFFSET(offset, pFD->szPage);
+  int64_t pgno = OFFSET_PGNO(fOffset, pFD->szPage);
   int32_t szPgCont = PAGE_CONTENT_SIZE(pFD->szPage);
 
   ASSERT(pgno);
   if (pFD->pgno == pgno) {
-    int64_t bOff = offset % pFD->szPage;
-    int64_t nRead = TMIN(szPgCont - bOff, count);
+    int64_t bOff = fOffset % pFD->szPage;
+    int64_t nRead = TMIN(szPgCont - bOff, size);
 
     ASSERT(bOff < szPgCont);
 
@@ -158,11 +162,11 @@ static int32_t tsdbReadFile(STsdbFD *pFD, int64_t offset, uint8_t *pBuf, int64_t
     pgno++;
   }
 
-  while (n < count) {
+  while (n < size) {
     code = tsdbReadFilePage(pFD, pgno);
     if (code) goto _exit;
 
-    int64_t nRead = TMIN(szPgCont, count - n);
+    int64_t nRead = TMIN(szPgCont, size - n);
     memcpy(pBuf + n, pFD->pBuf, nRead);
 
     n += nRead;
@@ -794,9 +798,10 @@ _err:
 }
 
 int32_t tsdbReadBlockIdx(SDataFReader *pReader, SArray *aBlockIdx) {
-  int32_t code = 0;
-  int64_t offset = pReader->pSet->pHeadF->offset;
-  int64_t size = pReader->pSet->pHeadF->size - offset;  // todo
+  int32_t    code = 0;
+  SHeadFile *pHeadFile = pReader->pSet->pHeadF;
+  int64_t    offset = pHeadFile->offset;
+  int64_t    size = pHeadFile->size - offset;
 
   taosArrayClear(aBlockIdx);
   if (size == 0) return code;
@@ -810,10 +815,7 @@ int32_t tsdbReadBlockIdx(SDataFReader *pReader, SArray *aBlockIdx) {
   if (code) goto _err;
 
   // decode
-  uint32_t delimiter;
-  int64_t  n = tGetU32(pReader->aBuf[0], &delimiter);
-  ASSERT(delimiter == TSDB_FILE_DLMT);
-
+  int64_t n = 0;
   while (n < size) {
     SBlockIdx blockIdx;
     n += tGetBlockIdx(pReader->aBuf[0] + n, &blockIdx);
@@ -833,9 +835,10 @@ _err:
 }
 
 int32_t tsdbReadSstBlk(SDataFReader *pReader, int32_t iSst, SArray *aSstBlk) {
-  int32_t code = 0;
-  int64_t offset = pReader->pSet->aSstF[iSst]->offset;
-  int64_t size = pReader->pSet->aSstF[iSst]->size - offset;  // todo
+  int32_t   code = 0;
+  SSstFile *pSstFile = pReader->pSet->aSstF[iSst];
+  int64_t   offset = pSstFile->offset;
+  int64_t   size = pSstFile->size - offset;
 
   taosArrayClear(aSstBlk);
   if (size == 0) return code;
@@ -849,10 +852,7 @@ int32_t tsdbReadSstBlk(SDataFReader *pReader, int32_t iSst, SArray *aSstBlk) {
   if (code) goto _err;
 
   // decode
-  uint32_t delimiter;
-  int64_t  n = tGetU32(pReader->aBuf[0], &delimiter);
-  ASSERT(delimiter == TSDB_FILE_DLMT);
-
+  int64_t n = 0;
   while (n < size) {
     SSstBlk sstBlk;
     n += tGetSstBlk(pReader->aBuf[0] + n, &sstBlk);
@@ -885,16 +885,12 @@ int32_t tsdbReadBlock(SDataFReader *pReader, SBlockIdx *pBlockIdx, SMapData *mBl
   if (code) goto _err;
 
   // decode
-  uint32_t delimiter;
-  int64_t  n = tGetU32(pReader->aBuf[0], &delimiter);
-  ASSERT(delimiter == TSDB_FILE_DLMT);
-
-  int64_t tn = tGetMapData(pReader->aBuf[0] + n, mBlock);
-  if (tn < 0) {
+  int64_t n = tGetMapData(pReader->aBuf[0], mBlock);
+  if (n < 0) {
     code = TSDB_CODE_OUT_OF_MEMORY;
     goto _err;
   }
-  ASSERT(n + tn == size);
+  ASSERT(n == size);
 
   return code;
 
@@ -912,12 +908,11 @@ int32_t tsdbReadBlockSma(SDataFReader *pReader, SDataBlk *pDataBlk, SArray *aCol
   taosArrayClear(aColumnDataAgg);
 
   // alloc
-  int32_t size = pSmaInfo->size;
-  code = tRealloc(&pReader->aBuf[0], size);
+  code = tRealloc(&pReader->aBuf[0], pSmaInfo->size);
   if (code) goto _err;
 
   // read
-  code = tsdbReadFile(pReader->pSmaFD, pSmaInfo->offset, pReader->aBuf[0], size);
+  code = tsdbReadFile(pReader->pSmaFD, pSmaInfo->offset, pReader->aBuf[0], pSmaInfo->size);
   if (code) goto _err;
 
   // decode
@@ -1117,7 +1112,8 @@ int32_t tsdbReadSstBlockEx(SDataFReader *pReader, int32_t iSst, SSstBlk *pSstBlk
   int32_t code = 0;
 
   // read
-  tsdbReadFile(pReader->aSstFD[iSst], pSstBlk->bInfo.offset, pReader->aBuf[0], pSstBlk->bInfo.szBlock);
+  code = tsdbReadFile(pReader->aSstFD[iSst], pSstBlk->bInfo.offset, pReader->aBuf[0], pSstBlk->bInfo.szBlock);
+  if (code) goto _exit;
 
   // decmpr
   code = tDecmprBlockData(pReader->aBuf[0], pSstBlk->bInfo.szBlock, pBlockData, &pReader->aBuf[1]);