diff --git a/source/dnode/vnode/src/tsdb/tsdbCommit.c b/source/dnode/vnode/src/tsdb/tsdbCommit.c
index 26e691b249..4b43871096 100644
--- a/source/dnode/vnode/src/tsdb/tsdbCommit.c
+++ b/source/dnode/vnode/src/tsdb/tsdbCommit.c
@@ -20,6 +20,32 @@ typedef struct {
   STSchema *pTSchema;
 } SSkmInfo;
 
+typedef struct {
+  int64_t suid;
+  int64_t uid;
+  TSDBROW row;
+} SRowInfo;
+
+typedef struct {
+  SRBTreeNode n;
+  SRowInfo    r;
+  int8_t      type;
+  union {
+    struct {
+      SArray     *aTbDataP;
+      int32_t     iTbDataP;
+      STbDataIter iter;
+    };  // memory data iter
+    struct {
+      int32_t    iLast;
+      SArray    *aBlockL;
+      int32_t    iBlockL;
+      SBlockData bData;
+      int32_t    iRow;
+    };  // last file data iter
+  };
+} SDataIter;
+
 typedef struct {
   STsdb *pTsdb;
   int8_t toMerge;
@@ -47,6 +73,10 @@ typedef struct {
     SMapData      mBlock;  // SMapData<SBlock>
     SBlockData    bData;
   } dReader;
+  struct {
+    SDataIter *pIter;
+    SRBTree    rbt;
+  };
   struct {
     SDataFWriter *pWriter;
     SArray       *aBlockIdx;  // SArray<SBlockIdx>
@@ -65,6 +95,9 @@ typedef struct {
   SArray      *aDelData;  // SArray<SDelData>
 } SCommitter;
 
+extern int32_t tsdbReadLastBlockEx(SDataFReader *pReader, int32_t iLast, SBlockL *pBlockL,
+                                   SBlockData *pBlockData);  // todo
+
 static int32_t tsdbStartCommit(STsdb *pTsdb, SCommitter *pCommitter);
 static int32_t tsdbCommitData(SCommitter *pCommitter);
 static int32_t tsdbCommitDel(SCommitter *pCommitter);
@@ -1289,28 +1322,7 @@ _err:
   return code;
 }
 
-// Merger =====================================================================
-typedef struct {
-  int64_t suid;
-  int64_t uid;
-  TSDBROW row;
-} SRowInfo;
-
-typedef struct {
-  SRowInfo      rowInfo;
-  SDataFReader *pReader;
-  int32_t       iLast;
-  SArray       *aBlockL;  // SArray<SBlockL>
-  int32_t       iBlockL;
-  SBlockData    bData;
-  int32_t       iRow;
-} SLDataIter;
-
-typedef struct {
-  SRBTreeNode *pNode;
-  SRBTree      rbt;
-} SDataMerger;
-
+// ================================================================================
 static int32_t tRowInfoCmprFn(const void *p1, const void *p2) {
   SRowInfo *pInfo1 = (SRowInfo *)p1;
   SRowInfo *pInfo2 = (SRowInfo *)p2;
@@ -1330,6 +1342,165 @@ static int32_t tRowInfoCmprFn(const void *p1, const void *p2) {
   return tsdbRowCmprFn(&pInfo1->row, &pInfo2->row);
 }
 
+static int32_t tsdbNextCommitRow(SCommitter *pCommitter, SRowInfo **ppInfo) {
+  int32_t code = 0;
+
+  if (pCommitter->pIter) {
+    SDataIter *pIter = pCommitter->pIter;
+    if (pCommitter->pIter->type == 0) {  // memory
+      tsdbTbDataIterNext(&pIter->iter);
+      TSDBROW *pRow = tsdbTbDataIterGet(&pIter->iter);
+      while (true) {
+        if (pRow && TSDBROW_TS(pRow) > pCommitter->maxKey) {
+          pCommitter->nextKey = TMIN(pCommitter->nextKey, TSDBROW_TS(pRow));
+          pRow = NULL;
+        }
+
+        if (pRow) {
+          pIter->r.suid = pIter->iter.pTbData->suid;
+          pIter->r.uid = pIter->iter.pTbData->uid;
+          pIter->r.row = *pRow;
+          break;
+        }
+
+        pIter->iTbDataP++;
+        if (pIter->iTbDataP < taosArrayGetSize(pIter->aTbDataP)) {
+          STbData *pTbData = (STbData *)taosArrayGetP(pIter->aTbDataP, pIter->iTbDataP);
+          TSDBKEY  keyFrom = {.ts = pCommitter->minKey, .version = VERSION_MIN};
+          tsdbTbDataIterOpen(pTbData, &keyFrom, 0, &pIter->iter);
+          pRow = tsdbTbDataIterGet(&pIter->iter);
+          continue;
+        } else {
+          pCommitter->pIter = NULL;
+          break;
+        }
+      }
+    } else if (pCommitter->pIter->type == 1) {  // last file
+      pIter->iRow++;
+      if (pIter->iRow < pIter->bData.nRow) {
+        pIter->r.uid = pIter->bData.uid ? pIter->bData.uid : pIter->bData.aUid[pIter->iRow];
+        pIter->r.row = tsdbRowFromBlockData(&pIter->bData, pIter->iRow);
+      } else {
+        pIter->iBlockL++;
+        if (pIter->iBlockL < taosArrayGetSize(pIter->aBlockL)) {
+          SBlockL *pBlockL = (SBlockL *)taosArrayGet(pIter->aBlockL, pIter->iBlockL);
+
+          code = tsdbReadLastBlockEx(pCommitter->dReader.pReader, pIter->iLast, pBlockL, &pIter->bData);
+          if (code) goto _exit;
+
+          pIter->iRow = 0;
+          pIter->r.suid = pIter->bData.suid;
+          pIter->r.uid = pIter->bData.uid ? pIter->bData.uid : pIter->bData.aUid[0];
+          pIter->r.row = tsdbRowFromBlockData(&pIter->bData, 0);
+        } else {
+          pCommitter->pIter = NULL;
+        }
+      }
+    } else {
+      ASSERT(0);
+    }
+
+    // compare with min in RB Tree
+    pIter = (SDataIter *)tRBTreeMin(&pCommitter->rbt);
+    if (pCommitter->pIter && pIter) {
+      int32_t c = tRowInfoCmprFn(&pCommitter->pIter->r, &pIter->r);
+      if (c > 0) {
+        tRBTreePut(&pCommitter->rbt, (SRBTreeNode *)pCommitter->pIter);
+        pCommitter->pIter = NULL;
+      } else {
+        ASSERT(c);
+      }
+    }
+  }
+
+  if (pCommitter->pIter == NULL) {
+    pCommitter->pIter = (SDataIter *)tRBTreeMin(&pCommitter->rbt);
+    if (pCommitter->pIter) {
+      tRBTreeDrop(&pCommitter->rbt, (SRBTreeNode *)pCommitter->pIter);
+    }
+  }
+
+  if (pCommitter->pIter) {
+    *ppInfo = &pCommitter->pIter->r;
+  } else {
+    *ppInfo = NULL;
+  }
+
+_exit:
+  return code;
+}
+
+static int32_t tsdbCommitFileDataImpl(SCommitter *pCommitter) {
+  int32_t code = 0;
+
+  SRowInfo *pRowInfo = NULL;
+  TABLEID   id = {0};
+  while (true) {
+    code = tsdbNextCommitRow(pCommitter, &pRowInfo);
+    if (code) goto _err;
+
+    if (pRowInfo == NULL) {
+      // end the commit (todo)
+      break;
+    }
+
+    if (id.suid != pRowInfo->suid || id.uid != pRowInfo->uid) {
+      // table changed, end current table commit (todo)
+
+      // prepare the new
+      id.suid = pRowInfo->suid;
+      id.uid = pRowInfo->uid;
+    }
+
+    SBlockIdx *pBlockIdx = pCommitter->dReader.pBlockIdx;
+    if (pBlockIdx && pBlockIdx->suid == id.suid && pBlockIdx->uid == id.uid) {
+      while (true) {
+        /* code */
+      }
+    }
+
+    if (pRowInfo->row.type == 0) {
+      code = tsdbCommitterUpdateRowSchema(pCommitter, pRowInfo->suid, pRowInfo->uid, TSDBROW_SVERSION(&pRowInfo->row));
+      if (code) goto _err;
+    }
+
+    code = tBlockDataAppendRow(&pCommitter->dWriter.bData, &pRowInfo->row, pCommitter->skmRow.pTSchema, pRowInfo->uid);
+    if (code) goto _err;
+
+    if (pCommitter->dWriter.bData.nRow >= pCommitter->maxRow * 4 / 5) {
+      if (1 /*toLastOnly*/) {
+        code = tsdbCommitLastBlock(pCommitter);
+        if (code) goto _err;
+      } else {
+        code = tsdbCommitDataBlock(pCommitter, NULL);
+        if (code) goto _err;
+      }
+    }
+  }
+
+  return code;
+
+_err:
+  tsdbError("vgId:%d tsdb commit file data impl failed since %s", TD_VID(pCommitter->pTsdb->pVnode), tstrerror(code));
+  return code;
+}
+
+// ================================================================================
+typedef struct {
+  SRowInfo      rowInfo;
+  SDataFReader *pReader;
+  int32_t       iLast;
+  SArray       *aBlockL;  // SArray<SBlockL>
+  int32_t       iBlockL;
+  SBlockData    bData;
+  int32_t       iRow;
+} SLDataIter;
+
+typedef struct {
+  SRBTreeNode *pNode;
+  SRBTree      rbt;
+} SDataMerger;
+
 static void tDataMergerInit(SDataMerger *pMerger, SArray *aNodeP) {
   pMerger->pNode = NULL;
   tRBTreeCreate(&pMerger->rbt, tRowInfoCmprFn);
@@ -1341,9 +1512,6 @@ static void tDataMergerInit(SDataMerger *pMerger, SArray *aNodeP) {
   }
 }
 
-extern int32_t tsdbReadLastBlockEx(SDataFReader *pReader, int32_t iLast, SBlockL *pBlockL,
-                                   SBlockData *pBlockData);  // todo
-
 static int32_t tDataMergeNext(SDataMerger *pMerger, SRowInfo **ppInfo) {
   int32_t code = 0;
 
@@ -1401,7 +1569,6 @@ _exit:
   return code;
 }
 
-// ================================================================================
 typedef struct {
   STsdb  *pTsdb;
   int8_t  maxLast;