diff --git a/source/dnode/vnode/src/inc/meta.h b/source/dnode/vnode/src/inc/meta.h
index 2efc33a8ee1350d3c2ee05536eced70b9edc3463..adfbb919206a184664655cc11746c1d25c14147b 100644
--- a/source/dnode/vnode/src/inc/meta.h
+++ b/source/dnode/vnode/src/inc/meta.h
@@ -66,7 +66,6 @@ int32_t metaCacheOpen(SMeta* pMeta);
 void    metaCacheClose(SMeta* pMeta);
 int32_t metaCacheUpsert(SMeta* pMeta, SMetaInfo* pInfo);
 int32_t metaCacheDrop(SMeta* pMeta, int64_t uid);
-int32_t metaCacheGet(SMeta* pMeta, int64_t uid, SMetaInfo* pInfo);
 
 struct SMeta {
   TdThreadRwlock lock;
diff --git a/source/dnode/vnode/src/meta/metaQuery.c b/source/dnode/vnode/src/meta/metaQuery.c
index 9c879bf36950842a70879ebfc391731a37324565..9bbff6c6bd2285f752c6b104f5445e3c06927168 100644
--- a/source/dnode/vnode/src/meta/metaQuery.c
+++ b/source/dnode/vnode/src/meta/metaQuery.c
@@ -127,7 +127,7 @@ _err:
 //   return 0;
 // }
 
-bool metaIsTableExist(SMeta  *pMeta, tb_uid_t uid) {
+bool metaIsTableExist(SMeta *pMeta, tb_uid_t uid) {
   // query uid.idx
   if (tdbTbGet(pMeta->pUidIdx, &uid, sizeof(uid), NULL, NULL) < 0) {
     return false;
@@ -1051,6 +1051,8 @@ int32_t metaGetTableTags(SMeta *pMeta, uint64_t suid, SArray *uidList, SHashObj
   return TSDB_CODE_SUCCESS;
 }
 
+int32_t metaCacheGet(SMeta *pMeta, int64_t uid, SMetaInfo *pInfo);
+
 int32_t metaGetInfo(SMeta *pMeta, int64_t uid, SMetaInfo *pInfo) {
   int32_t code = 0;
   void   *pData = NULL;
diff --git a/source/dnode/vnode/src/tsdb/tsdbFile.c b/source/dnode/vnode/src/tsdb/tsdbFile.c
index 5db02fa285cd675f72aba603d7bd3b6cfed2db9e..00d2ac848f6d599fef54d9957047521e27062c89 100644
--- a/source/dnode/vnode/src/tsdb/tsdbFile.c
+++ b/source/dnode/vnode/src/tsdb/tsdbFile.c
@@ -188,11 +188,16 @@ int32_t tPutDFileSet(uint8_t *p, SDFileSet *pSet) {
   n += tPutI32v(p ? p + n : p, pSet->diskId.level);
   n += tPutI32v(p ? p + n : p, pSet->diskId.id);
   n += tPutI32v(p ? p + n : p, pSet->fid);
+
+  // data
   n += tPutHeadFile(p ? p + n : p, pSet->pHeadF);
   n += tPutDataFile(p ? p + n : p, pSet->pDataF);
-  n += tPutLastFile(p ? p + n : p, pSet->pLastF);
   n += tPutSmaFile(p ? p + n : p, pSet->pSmaF);
 
+  // last
+  n += tPutU8(p ? p + n : p, 1);  // for future compatibility
+  n += tPutLastFile(p ? p + n : p, pSet->pLastF);
+
   return n;
 }
 
@@ -202,11 +207,17 @@ int32_t tGetDFileSet(uint8_t *p, SDFileSet *pSet) {
   n += tGetI32v(p + n, &pSet->diskId.level);
   n += tGetI32v(p + n, &pSet->diskId.id);
   n += tGetI32v(p + n, &pSet->fid);
+
+  // data
   n += tGetHeadFile(p + n, pSet->pHeadF);
   n += tGetDataFile(p + n, pSet->pDataF);
-  n += tGetLastFile(p + n, pSet->pLastF);
   n += tGetSmaFile(p + n, pSet->pSmaF);
 
+  // last
+  uint8_t nLast;
+  n += tGetU8(p + n, &nLast);
+  n += tGetLastFile(p + n, pSet->pLastF);
+
   return n;
 }
 
diff --git a/source/dnode/vnode/src/tsdb/tsdbSnapshot.c b/source/dnode/vnode/src/tsdb/tsdbSnapshot.c
index a970b0be74c9468b05525bf71684006fa813fb2e..744f16b113e898659234fe5fc9a522be951bc70d 100644
--- a/source/dnode/vnode/src/tsdb/tsdbSnapshot.c
+++ b/source/dnode/vnode/src/tsdb/tsdbSnapshot.c
@@ -30,8 +30,6 @@ struct STsdbSnapReader {
   SArray*       aBlockL;    // SArray<SBlockL>
   SBlockIdx*    pBlockIdx;
   SBlockL*      pBlockL;
-  SBlock*       pBlock;
-  SBlock        block;
 
   int32_t    iBlockIdx;
   int32_t    iBlockL;
@@ -78,9 +76,6 @@ static int32_t tsdbSnapReadData(STsdbSnapReader* pReader, uint8_t** ppData) {
         if (code) goto _err;
 
         pReader->iBlock = 0;
-        if (pReader->iBlock < pReader->mBlock.nItem) {
-          tMapDataGetItemByIdx(&pReader->mBlock, pReader->iBlock, &pReader->block, tGetBlock);
-        }
       } else {
         pReader->pBlockIdx = NULL;
       }
@@ -97,18 +92,16 @@ static int32_t tsdbSnapReadData(STsdbSnapReader* pReader, uint8_t** ppData) {
 
     while (true) {
       if (pReader->pBlockIdx && pReader->pBlockL) {
-        TABLEID minId = {.suid = pReader->pBlockL->suid, .uid = pReader->pBlockL->minUid};
-        TABLEID maxId = {.suid = pReader->pBlockL->suid, .uid = pReader->pBlockL->maxUid};
-
-        if (tTABLEIDCmprFn(pReader->pBlockIdx, &minId) < 0) {
-          // TODO
-        } else if (tTABLEIDCmprFn(pReader->pBlockIdx, &maxId) < 0) {
-          // TODO
-        } else {
-          // TODO
-        }
+        TABLEID id = {.suid = pReader->pBlockL->suid, .uid = pReader->pBlockL->minUid};
+
+        // if (tTABLEIDCmprFn(pReader->pBlockIdx, &minId) < 0) {
+        //   // TODO
+        // } else if (tTABLEIDCmprFn(pReader->pBlockIdx, &maxId) < 0) {
+        //   // TODO
+        // } else {
+        //   // TODO
+        // }
       } else if (pReader->pBlockIdx) {
-        // may have problem (todo)
         while (pReader->iBlock < pReader->mBlock.nItem) {
           SBlock block;
           tMapDataGetItemByIdx(&pReader->mBlock, pReader->iBlock, &block, tGetBlock);
@@ -119,9 +112,24 @@ static int32_t tsdbSnapReadData(STsdbSnapReader* pReader, uint8_t** ppData) {
 
           // next
           pReader->iBlock++;
+          if (*ppData) break;
+        }
 
-          if (*ppData) goto _exit;
+        if (pReader->iBlock >= pReader->mBlock.nItem) {
+          pReader->iBlockIdx++;
+          if (pReader->iBlockIdx < taosArrayGetSize(pReader->aBlockIdx)) {
+            pReader->pBlockIdx = (SBlockIdx*)taosArrayGet(pReader->aBlockIdx, pReader->iBlockIdx);
+
+            code = tsdbReadBlock(pReader->pDataFReader, pReader->pBlockIdx, &pReader->mBlock);
+            if (code) goto _err;
+
+            pReader->iBlock = 0;
+          } else {
+            pReader->pBlockIdx = NULL;
+          }
         }
+
+        if (*ppData) goto _exit;
       } else if (pReader->pBlockL) {
         while (pReader->pBlockL) {
           if (pReader->pBlockL->minVer <= pReader->ever && pReader->pBlockL->maxVer >= pReader->sver) {