diff --git a/source/dnode/vnode/src/inc/tsdb.h b/source/dnode/vnode/src/inc/tsdb.h
index 98a3ee9fdb2b871995c1306ea70d8af8049fd8ce..33c2c8a737ad91aede25dcafd7c2a03ca6ed5015 100644
--- a/source/dnode/vnode/src/inc/tsdb.h
+++ b/source/dnode/vnode/src/inc/tsdb.h
@@ -66,11 +66,11 @@ typedef struct SSmaInfo      SSmaInfo;
 typedef struct SBlockCol     SBlockCol;
 typedef struct SVersionRange SVersionRange;
 
-#define TSDB_FILE_DLMT         ((uint32_t)0xF00AFA0F)
-#define TSDB_MAX_SUBBLOCKS     8
-#define TSDB_MAX_LAST_FILE     16
-#define TSDB_DEFAULT_LAST_FILE 8
-#define TSDB_FHDR_SIZE         512
+#define TSDB_FILE_DLMT        ((uint32_t)0xF00AFA0F)
+#define TSDB_MAX_SUBBLOCKS    8
+#define TSDB_MAX_SST_FILE     16
+#define TSDB_DEFAULT_SST_FILE 8
+#define TSDB_FHDR_SIZE        512
 
 #define HAS_NONE  ((int8_t)0x1)
 #define HAS_NULL  ((int8_t)0x2)
@@ -563,7 +563,7 @@ struct SDFileSet {
   SDataFile *pDataF;
   SSmaFile  *pSmaF;
   uint8_t    nSstF;
-  SSstFile  *aSstF[TSDB_MAX_LAST_FILE];
+  SSstFile  *aSstF[TSDB_MAX_SST_FILE];
 };
 
 struct SRowIter {
@@ -598,7 +598,7 @@ struct SDataFWriter {
   SHeadFile fHead;
   SDataFile fData;
   SSmaFile  fSma;
-  SSstFile  fSst[TSDB_MAX_LAST_FILE];
+  SSstFile  fSst[TSDB_MAX_SST_FILE];
 
   uint8_t *aBuf[4];
 };
@@ -615,7 +615,7 @@ struct SDataFReader {
   TdFilePtr  pHeadFD;
   TdFilePtr  pDataFD;
   TdFilePtr  pSmaFD;
-  TdFilePtr  aLastFD[TSDB_MAX_LAST_FILE];
+  TdFilePtr  aLastFD[TSDB_MAX_SST_FILE];
 
   uint8_t *aBuf[3];
 };
diff --git a/source/dnode/vnode/src/tsdb/tsdbCommit.c b/source/dnode/vnode/src/tsdb/tsdbCommit.c
index 42ab6ce3b255deb90464e8ccc7068402bed5c677..5b827d8ed213037084633147bf5d631e826b9c4d 100644
--- a/source/dnode/vnode/src/tsdb/tsdbCommit.c
+++ b/source/dnode/vnode/src/tsdb/tsdbCommit.c
@@ -71,7 +71,7 @@ typedef struct {
     SDataIter *pIter;
     SRBTree    rbt;
     SDataIter  dataIter;
-    SDataIter  aDataIter[TSDB_MAX_LAST_FILE];
+    SDataIter  aDataIter[TSDB_MAX_SST_FILE];
     int8_t     toLastOnly;
   };
   struct {
@@ -760,7 +760,7 @@ static int32_t tsdbStartCommit(STsdb *pTsdb, SCommitter *pCommitter) {
   pCommitter->minRow = pTsdb->pVnode->config.tsdbCfg.minRows;
   pCommitter->maxRow = pTsdb->pVnode->config.tsdbCfg.maxRows;
   pCommitter->cmprAlg = pTsdb->pVnode->config.tsdbCfg.compression;
-  pCommitter->maxLast = TSDB_DEFAULT_LAST_FILE;  // TODO: make it as a config
+  pCommitter->maxLast = TSDB_DEFAULT_SST_FILE;  // TODO: make it as a config
   pCommitter->aTbDataP = tsdbMemTableGetTbDataArray(pTsdb->imem);
   if (pCommitter->aTbDataP == NULL) {
     code = TSDB_CODE_OUT_OF_MEMORY;
@@ -790,7 +790,7 @@ static int32_t tsdbCommitDataStart(SCommitter *pCommitter) {
   if (code) goto _exit;
 
   // merger
-  for (int32_t iSst = 0; iSst < TSDB_MAX_LAST_FILE; iSst++) {
+  for (int32_t iSst = 0; iSst < TSDB_MAX_SST_FILE; iSst++) {
     SDataIter *pIter = &pCommitter->aDataIter[iSst];
     pIter->aSstBlk = taosArrayInit(0, sizeof(SSstBlk));
     if (pIter->aSstBlk == NULL) {
@@ -832,7 +832,7 @@ static void tsdbCommitDataEnd(SCommitter *pCommitter) {
   tBlockDataDestroy(&pCommitter->dReader.bData, 1);
 
   // merger
-  for (int32_t iSst = 0; iSst < TSDB_MAX_LAST_FILE; iSst++) {
+  for (int32_t iSst = 0; iSst < TSDB_MAX_SST_FILE; iSst++) {
     SDataIter *pIter = &pCommitter->aDataIter[iSst];
     taosArrayDestroy(pIter->aSstBlk);
     tBlockDataDestroy(&pIter->bData, 1);
diff --git a/source/dnode/vnode/src/tsdb/tsdbMergeTree.c b/source/dnode/vnode/src/tsdb/tsdbMergeTree.c
index ce36d74467ec02d62ea1a2546865567ad750d306..0589199d24a2fadc2eb0876f1041636726eaacab 100644
--- a/source/dnode/vnode/src/tsdb/tsdbMergeTree.c
+++ b/source/dnode/vnode/src/tsdb/tsdbMergeTree.c
@@ -273,7 +273,8 @@ static FORCE_INLINE int32_t tLDataIterCmprFn(const void *p1, const void *p2) {
   }
 }
 
-int32_t tMergeTreeOpen(SMergeTree *pMTree, int8_t backward, SDataFReader* pFReader, uint64_t uid, STimeWindow* pTimeWindow, SVersionRange* pVerRange) {
+int32_t tMergeTreeOpen(SMergeTree *pMTree, int8_t backward, SDataFReader *pFReader, uint64_t uid,
+                       STimeWindow *pTimeWindow, SVersionRange *pVerRange) {
   pMTree->backward = backward;
   pMTree->pIter = NULL;
   pMTree->pIterList = taosArrayInit(4, POINTER_BYTES);
@@ -284,8 +285,8 @@ int32_t tMergeTreeOpen(SMergeTree *pMTree, int8_t backward, SDataFReader* pFRead
   tRBTreeCreate(&pMTree->rbt, tLDataIterCmprFn);
   int32_t code = TSDB_CODE_OUT_OF_MEMORY;
 
-  struct SLDataIter* pIterList[TSDB_DEFAULT_LAST_FILE] = {0};
-  for(int32_t i = 0; i < pFReader->pSet->nSstF; ++i) { // open all last file
+  struct SLDataIter *pIterList[TSDB_DEFAULT_SST_FILE] = {0};
+  for (int32_t i = 0; i < pFReader->pSet->nSstF; ++i) {  // open all last file
     code = tLDataIterOpen(&pIterList[i], pFReader, i, pMTree->backward, uid, pTimeWindow, pVerRange);
     if (code != TSDB_CODE_SUCCESS) {
       goto _end;
@@ -302,7 +303,7 @@ int32_t tMergeTreeOpen(SMergeTree *pMTree, int8_t backward, SDataFReader* pFRead
 
   return code;
 
-  _end:
+_end:
   tMergeTreeClose(pMTree);
   return code;
 }