diff --git a/source/dnode/vnode/src/tsdb/tsdbCommit2.c b/source/dnode/vnode/src/tsdb/tsdbCommit2.c
index ce88aa55d35f13ef08c94da687050a2af7dde841..7e5db55ebac5a271f3e3172bc386ffb042d8aafc 100644
--- a/source/dnode/vnode/src/tsdb/tsdbCommit2.c
+++ b/source/dnode/vnode/src/tsdb/tsdbCommit2.c
@@ -21,8 +21,8 @@ typedef struct {
   TFileSetArray *fsetArr;
   TFileOpArray   fopArray[1];
 
-  SSkmInfo skmTb[1];
-  SSkmInfo skmRow[1];
+  // SSkmInfo skmTb[1];
+  // SSkmInfo skmRow[1];
 
   int32_t minutes;
   int8_t  precision;
@@ -56,45 +56,29 @@ typedef struct {
   SIterMerger   *tombIterMerger;
 
   // writer
-  SBlockData       blockData[2];
-  int32_t          blockDataIdx;
-  SDataFileWriter *dataWriter;
-  SSttFileWriter  *sttWriter;
+  SFSetWriter *writer;
 } SCommitter2;
 
 static int32_t tsdbCommitOpenWriter(SCommitter2 *committer) {
   int32_t code = 0;
   int32_t lino = 0;
 
-  // stt writer
-  SSttFileWriterConfig config[1] = {{
+  SFSetWriterConfig config = {
       .tsdb = committer->tsdb,
+      .toSttOnly = true,
+      .compactVersion = committer->compactVersion,
+      .minRow = committer->minRow,
       .maxRow = committer->maxRow,
       .szPage = committer->szPage,
       .cmprAlg = committer->cmprAlg,
-      .compactVersion = committer->compactVersion,
-      .did = committer->ctx->did,
       .fid = committer->ctx->fid,
       .cid = committer->ctx->cid,
+      .did = committer->ctx->did,
       .level = 0,
-  }};
-
-  code = tsdbSttFileWriterOpen(config, &committer->sttWriter);
-  TSDB_CHECK_CODE(code, lino, _exit);
+  };
 
-  // data writer
   if (committer->sttTrigger == 1) {
-    // data writer
-    SDataFileWriterConfig config = {
-        .tsdb = committer->tsdb,
-        .cmprAlg = committer->cmprAlg,
-        .maxRow = committer->maxRow,
-        .szPage = committer->szPage,
-        .fid = committer->ctx->fid,
-        .cid = committer->ctx->cid,
-        .did = committer->ctx->did,
-        .compactVersion = committer->compactVersion,
-    };
+    config.toSttOnly = false;
 
     if (committer->ctx->fset) {
       for (int32_t ftype = TSDB_FTYPE_MIN; ftype < TSDB_FTYPE_MAX; ftype++) {
@@ -104,11 +88,11 @@ static int32_t tsdbCommitOpenWriter(SCommitter2 *committer) {
         }
       }
     }
-
-    code = tsdbDataFileWriterOpen(&config, &committer->dataWriter);
-    TSDB_CHECK_CODE(code, lino, _exit);
   }
 
+  code = tsdbFSetWriterOpen(&config, &committer->writer);
+  TSDB_CHECK_CODE(code, lino, _exit);
+
 _exit:
   if (code) {
     TSDB_ERROR_LOG(TD_VID(committer->tsdb->pVnode), lino, code);
@@ -117,22 +101,10 @@ _exit:
 }
 
 static int32_t tsdbCommitCloseWriter(SCommitter2 *committer) {
-  int32_t code = 0;
-  int32_t lino = 0;
-
-  code = tsdbSttFileWriterClose(&committer->sttWriter, 0, committer->fopArray);
-  TSDB_CHECK_CODE(code, lino, _exit);
-
-  code = tsdbDataFileWriterClose(&committer->dataWriter, 0, committer->fopArray);
-  TSDB_CHECK_CODE(code, lino, _exit);
-
-_exit:
-  if (code) {
-    TSDB_ERROR_LOG(TD_VID(committer->tsdb->pVnode), lino, code);
-  }
-  return code;
+  return tsdbFSetWriterClose(&committer->writer, 0, committer->fopArray);
 }
 
+#if 0
 static int32_t tsdbCommitTSDataToDataTableBegin(SCommitter2 *committer, const TABLEID *tbid) {
   int32_t code = 0;
   int32_t lino = 0;
@@ -328,17 +300,30 @@ _exit:
   }
   return code;
 }
+#endif
 
 static int32_t tsdbCommitTSData(SCommitter2 *committer) {
-  int32_t code = 0;
-  int32_t lino = 0;
+  int32_t   code = 0;
+  int32_t   lino = 0;
+  SMetaInfo info;
 
-  // loop iter
-  if (committer->sttTrigger == 1) {
-    code = tsdbCommitTSDataToData(committer);
+  for (SRowInfo *row; (row = tsdbIterMergerGetData(committer->dataIterMerger)) != NULL;) {
+    if (row->uid != committer->ctx->tbid->uid) {
+      // Ignore table of obsolescence
+      if (metaGetInfo(committer->tsdb->pVnode->pMeta, row->uid, &info, NULL) != 0) {
+        code = tsdbIterMergerSkipTableData(committer->dataIterMerger, (TABLEID *)row);
+        TSDB_CHECK_CODE(code, lino, _exit);
+        continue;
+      }
+
+      committer->ctx->tbid->suid = row->suid;
+      committer->ctx->tbid->uid = row->uid;
+    }
+
+    code = tsdbFSetWriteRow(committer->writer, row);
     TSDB_CHECK_CODE(code, lino, _exit);
-  } else {
-    code = tsdbCommitTSDataToStt(committer);
+
+    code = tsdbIterMergerNext(committer->dataIterMerger);
     TSDB_CHECK_CODE(code, lino, _exit);
   }
 
@@ -353,22 +338,12 @@ static int32_t tsdbCommitTombData(SCommitter2 *committer) {
   int32_t code = 0;
   int32_t lino = 0;
 
-  if (committer->dataWriter == NULL || tsdbSttFileWriterIsOpened(committer->sttWriter)) {
-    for (STombRecord *record; (record = tsdbIterMergerGetTombRecord(committer->tombIterMerger));) {
-      code = tsdbSttFileWriteTombRecord(committer->sttWriter, record);
-      TSDB_CHECK_CODE(code, lino, _exit);
-
-      code = tsdbIterMergerNext(committer->tombIterMerger);
-      TSDB_CHECK_CODE(code, lino, _exit);
-    }
-  } else {
-    for (STombRecord *record; (record = tsdbIterMergerGetTombRecord(committer->tombIterMerger));) {
-      code = tsdbDataFileWriteTombRecord(committer->dataWriter, record);
-      TSDB_CHECK_CODE(code, lino, _exit);
+  for (STombRecord *record; (record = tsdbIterMergerGetTombRecord(committer->tombIterMerger));) {
+    code = tsdbFSetWriteTombRecord(committer->writer, record);
+    TSDB_CHECK_CODE(code, lino, _exit);
 
-      code = tsdbIterMergerNext(committer->tombIterMerger);
-      TSDB_CHECK_CODE(code, lino, _exit);
-    }
+    code = tsdbIterMergerNext(committer->tombIterMerger);
+    TSDB_CHECK_CODE(code, lino, _exit);
   }
 
 _exit:
@@ -529,8 +504,7 @@ static int32_t tsdbCommitFileSetBegin(SCommitter2 *committer) {
 
   ASSERT(TARRAY2_SIZE(committer->dataIterArray) == 0);
   ASSERT(committer->dataIterMerger == NULL);
-  ASSERT(committer->sttWriter == NULL);
-  ASSERT(committer->dataWriter == NULL);
+  ASSERT(committer->writer == NULL);
 
   code = tsdbCommitOpenReader(committer);
   TSDB_CHECK_CODE(code, lino, _exit);
@@ -660,8 +634,7 @@ static int32_t tsdbCloseCommitter(SCommitter2 *committer, int32_t eno) {
     ASSERT(0);
   }
 
-  ASSERT(committer->dataWriter == NULL);
-  ASSERT(committer->sttWriter == NULL);
+  ASSERT(committer->writer == NULL);
   ASSERT(committer->dataIterMerger == NULL);
   ASSERT(committer->tombIterMerger == NULL);
   TARRAY2_DESTROY(committer->dataIterArray, NULL);
diff --git a/source/dnode/vnode/src/tsdb/tsdbCommit2.h b/source/dnode/vnode/src/tsdb/tsdbCommit2.h
index 72d7eb48eeb119de5918dfb2096383f75cbada65..41f72f345b4575f90c0632b857e0d0eae6f89a7a 100644
--- a/source/dnode/vnode/src/tsdb/tsdbCommit2.h
+++ b/source/dnode/vnode/src/tsdb/tsdbCommit2.h
@@ -15,6 +15,7 @@
 
 #include "tsdbDataFileRW.h"
 #include "tsdbFS2.h"
+#include "tsdbFSetRW.h"
 #include "tsdbIter.h"
 #include "tsdbSttFileRW.h"
 
diff --git a/source/dnode/vnode/src/tsdb/tsdbFSetRW.h b/source/dnode/vnode/src/tsdb/tsdbFSetRW.h
index 76f734c16f2eede744f14b4580e4137762095dcf..b5710407cfe40e28736c2949d3f3421e131c6624 100644
--- a/source/dnode/vnode/src/tsdb/tsdbFSetRW.h
+++ b/source/dnode/vnode/src/tsdb/tsdbFSetRW.h
@@ -41,7 +41,6 @@ typedef struct {
     bool   exist;
     STFile file;
   } files[TSDB_FTYPE_MAX];
-  STFile sttFile;
 } SFSetWriterConfig;
 
 int32_t tsdbFSetWriterOpen(SFSetWriterConfig *config, SFSetWriter **writer);
diff --git a/source/dnode/vnode/src/tsdb/tsdbMerge.c b/source/dnode/vnode/src/tsdb/tsdbMerge.c
index 358d735b1dc033fe9d2e21fba9ffffb53c8c737a..97229714e878130f9b3c27b89b6bd6a3a287eb58 100644
--- a/source/dnode/vnode/src/tsdb/tsdbMerge.c
+++ b/source/dnode/vnode/src/tsdb/tsdbMerge.c
@@ -19,15 +19,13 @@ typedef struct {
   STsdb         *tsdb;
   TFileSetArray *fsetArr;
 
-  int32_t  sttTrigger;
-  int32_t  maxRow;
-  int32_t  minRow;
-  int32_t  szPage;
-  int8_t   cmprAlg;
-  int64_t  compactVersion;
-  int64_t  cid;
-  SSkmInfo skmTb[1];
-  SSkmInfo skmRow[1];
+  int32_t sttTrigger;
+  int32_t maxRow;
+  int32_t minRow;
+  int32_t szPage;
+  int8_t  cmprAlg;
+  int64_t compactVersion;
+  int64_t cid;
 
   // context
   struct {
@@ -37,10 +35,7 @@ typedef struct {
     bool       toData;
     int32_t    level;
     SSttLvl   *lvl;
-    // STFileObj *fobj;
     TABLEID    tbid[1];
-    int32_t    blockDataIdx;
-    SBlockData blockData[2];
   } ctx[1];
 
   TFileOpArray fopArr[1];
@@ -53,8 +48,7 @@ typedef struct {
   TTsdbIterArray tombIterArr[1];
   SIterMerger   *tombIterMerger;
   // writer
-  SSttFileWriter  *sttWriter;
-  SDataFileWriter *dataWriter;
+  SFSetWriter *writer;
 } SMerger;
 
 static int32_t tsdbMergerOpen(SMerger *merger) {
@@ -86,8 +80,7 @@ static int32_t tsdbMergerClose(SMerger *merger) {
   }
   taosThreadRwlockUnlock(&merger->tsdb->rwLock);
 
-  ASSERT(merger->dataWriter == NULL);
-  ASSERT(merger->sttWriter == NULL);
+  ASSERT(merger->writer == NULL);
   ASSERT(merger->dataIterMerger == NULL);
   ASSERT(TARRAY2_SIZE(merger->dataIterArr) == 0);
   ASSERT(TARRAY2_SIZE(merger->sttReaderArr) == 0);
@@ -96,11 +89,6 @@ static int32_t tsdbMergerClose(SMerger *merger) {
   TARRAY2_DESTROY(merger->dataIterArr, NULL);
   TARRAY2_DESTROY(merger->sttReaderArr, NULL);
   TARRAY2_DESTROY(merger->fopArr, NULL);
-  for (int32_t i = 0; i < ARRAY_SIZE(merger->ctx->blockData); i++) {
-    tBlockDataDestroy(merger->ctx->blockData + i);
-  }
-  tDestroyTSchema(merger->skmTb->pTSchema);
-  tDestroyTSchema(merger->skmRow->pTSchema);
 
 _exit:
   if (code) {
@@ -109,6 +97,7 @@ _exit:
   return code;
 }
 
+#if 0
 static int32_t tsdbMergeToDataTableEnd(SMerger *merger) {
   if (merger->ctx->blockData[0].nRow + merger->ctx->blockData[1].nRow == 0) return 0;
 
@@ -297,6 +286,7 @@ _exit:
   }
   return code;
 }
+#endif
 
 static int32_t tsdbMergeFileSetBeginOpenReader(SMerger *merger) {
   int32_t code = 0;
@@ -413,49 +403,36 @@ static int32_t tsdbMergeFileSetBeginOpenWriter(SMerger *merger) {
     code = TSDB_CODE_FS_NO_VALID_DISK;
     TSDB_CHECK_CODE(code, lino, _exit);
   }
-
-  {
-    // to new level
-    SSttFileWriterConfig config[1] = {{
-        .tsdb = merger->tsdb,
-        .maxRow = merger->maxRow,
-        .szPage = merger->szPage,
-        .cmprAlg = merger->cmprAlg,
-        .compactVersion = merger->compactVersion,
-        .did = did,
-        .fid = merger->ctx->fset->fid,
-        .cid = merger->cid,
-        .level = merger->ctx->level,
-    }};
-    code = tsdbSttFileWriterOpen(config, &merger->sttWriter);
-    TSDB_CHECK_CODE(code, lino, _exit);
-  }
+  SFSetWriterConfig config = {
+      .tsdb = merger->tsdb,
+      .toSttOnly = true,
+      .compactVersion = merger->compactVersion,
+      .minRow = merger->minRow,
+      .maxRow = merger->maxRow,
+      .szPage = merger->szPage,
+      .cmprAlg = merger->cmprAlg,
+      .fid = merger->ctx->fset->fid,
+      .cid = merger->cid,
+      .did = did,
+      .level = merger->ctx->level,
+  };
 
   if (merger->ctx->toData) {
-    SDataFileWriterConfig config[1] = {{
-        .tsdb = merger->tsdb,
-        .cmprAlg = merger->cmprAlg,
-        .maxRow = merger->maxRow,
-        .szPage = merger->szPage,
-        .fid = merger->ctx->fset->fid,
-        .cid = merger->cid,
-        .did = did,
-        .compactVersion = merger->compactVersion,
-    }};
+    config.toSttOnly = false;
 
-    for (int32_t i = 0; i < TSDB_FTYPE_MAX; i++) {
-      if (merger->ctx->fset->farr[i]) {
-        config->files[i].exist = true;
-        config->files[i].file = merger->ctx->fset->farr[i]->f[0];
+    for (int32_t ftype = 0; ftype < TSDB_FTYPE_MAX; ++ftype) {
+      if (merger->ctx->fset->farr[ftype]) {
+        config.files[ftype].exist = true;
+        config.files[ftype].file = merger->ctx->fset->farr[ftype]->f[0];
       } else {
-        config->files[i].exist = false;
+        config.files[ftype].exist = false;
       }
     }
-
-    code = tsdbDataFileWriterOpen(config, &merger->dataWriter);
-    TSDB_CHECK_CODE(code, lino, _exit);
   }
 
+  code = tsdbFSetWriterOpen(&config, &merger->writer);
+  TSDB_CHECK_CODE(code, lino, _exit);
+
 _exit:
   if (code) {
     TSDB_ERROR_LOG(vid, lino, code);
@@ -470,15 +447,10 @@ static int32_t tsdbMergeFileSetBegin(SMerger *merger) {
   ASSERT(TARRAY2_SIZE(merger->sttReaderArr) == 0);
   ASSERT(TARRAY2_SIZE(merger->dataIterArr) == 0);
   ASSERT(merger->dataIterMerger == NULL);
-  ASSERT(merger->sttWriter == NULL);
-  ASSERT(merger->dataWriter == NULL);
+  ASSERT(merger->writer == NULL);
 
   merger->ctx->tbid->suid = 0;
   merger->ctx->tbid->uid = 0;
-  merger->ctx->blockDataIdx = 0;
-  for (int32_t i = 0; i < ARRAY_SIZE(merger->ctx->blockData); ++i) {
-    tBlockDataReset(merger->ctx->blockData + i);
-  }
 
   // open reader
   code = tsdbMergeFileSetBeginOpenReader(merger);
@@ -500,23 +472,7 @@ _exit:
 }
 
 static int32_t tsdbMergeFileSetEndCloseWriter(SMerger *merger) {
-  int32_t code = 0;
-  int32_t lino = 0;
-  int32_t vid = TD_VID(merger->tsdb->pVnode);
-
-  code = tsdbSttFileWriterClose(&merger->sttWriter, 0, merger->fopArr);
-  TSDB_CHECK_CODE(code, lino, _exit);
-
-  if (merger->ctx->toData) {
-    code = tsdbDataFileWriterClose(&merger->dataWriter, 0, merger->fopArr);
-    TSDB_CHECK_CODE(code, lino, _exit);
-  }
-
-_exit:
-  if (code) {
-    TSDB_ERROR_LOG(vid, lino, code);
-  }
-  return code;
+  return tsdbFSetWriterClose(&merger->writer, 0, merger->fopArr);
 }
 
 static int32_t tsdbMergeFileSetEndCloseIter(SMerger *merger) {
@@ -560,12 +516,49 @@ static int32_t tsdbMergeFileSet(SMerger *merger, STFileSet *fset) {
   code = tsdbMergeFileSetBegin(merger);
   TSDB_CHECK_CODE(code, lino, _exit);
 
-  // do merge
-  if (merger->ctx->toData) {
-    code = tsdbMergeToDataLevel(merger);
+  // data
+  SMetaInfo info;
+  SRowInfo *row;
+  merger->ctx->tbid->suid = 0;
+  merger->ctx->tbid->uid = 0;
+  while ((row = tsdbIterMergerGetData(merger->dataIterMerger)) != NULL) {
+    if (row->uid != merger->ctx->tbid->uid) {
+      if (metaGetInfo(merger->tsdb->pVnode->pMeta, row->uid, &info, NULL) != 0) {
+        code = tsdbIterMergerSkipTableData(merger->dataIterMerger, (TABLEID *)row);
+        TSDB_CHECK_CODE(code, lino, _exit);
+        continue;
+      }
+
+      merger->ctx->tbid->uid = row->uid;
+      merger->ctx->tbid->suid = row->suid;
+    }
+
+    code = tsdbFSetWriteRow(merger->writer, row);
     TSDB_CHECK_CODE(code, lino, _exit);
-  } else {
-    code = tsdbMergeToUpperLevel(merger);
+
+    code = tsdbIterMergerNext(merger->dataIterMerger);
+    TSDB_CHECK_CODE(code, lino, _exit);
+  }
+
+  // tomb
+  STombRecord *record;
+  merger->ctx->tbid->suid = 0;
+  merger->ctx->tbid->uid = 0;
+  while ((record = tsdbIterMergerGetTombRecord(merger->tombIterMerger)) != NULL) {
+    if (record->uid != merger->ctx->tbid->uid) {
+      merger->ctx->tbid->uid = record->uid;
+      merger->ctx->tbid->suid = record->suid;
+
+      if (metaGetInfo(merger->tsdb->pVnode->pMeta, record->uid, &info, NULL) != 0) {
+        code = tsdbIterMergerSkipTableData(merger->tombIterMerger, merger->ctx->tbid);
+        TSDB_CHECK_CODE(code, lino, _exit);
+        continue;
+      }
+    }
+    code = tsdbFSetWriteTombRecord(merger->writer, record);
+    TSDB_CHECK_CODE(code, lino, _exit);
+
+    code = tsdbIterMergerNext(merger->tombIterMerger);
     TSDB_CHECK_CODE(code, lino, _exit);
   }
 
diff --git a/source/dnode/vnode/src/tsdb/tsdbMerge.h b/source/dnode/vnode/src/tsdb/tsdbMerge.h
index e4c7aef614a44c7309dfe15e0aedf4884213151d..69d802fd2776eddba8d65090dfe5717ba4bb76bc 100644
--- a/source/dnode/vnode/src/tsdb/tsdbMerge.h
+++ b/source/dnode/vnode/src/tsdb/tsdbMerge.h
@@ -15,6 +15,7 @@
 
 #include "tsdbDataFileRW.h"
 #include "tsdbFS2.h"
+#include "tsdbFSetRW.h"
 #include "tsdbIter.h"
 #include "tsdbSttFileRW.h"
 #include "tsdbUtil2.h"