diff --git a/include/libs/wal/wal.h b/include/libs/wal/wal.h
index 7342af4d1844f2a561bd15240f82326d6e20d618..c435cdb03bcd67e13fc7ac819b1b4089fa04e0aa 100644
--- a/include/libs/wal/wal.h
+++ b/include/libs/wal/wal.h
@@ -61,30 +61,41 @@ extern "C" {
     }                                                             \
   }
 
-#define WAL_HEAD_VER 0
+#define WAL_HEAD_VER     0
 #define WAL_NOSUFFIX_LEN 20
-#define WAL_SUFFIX_AT (WAL_NOSUFFIX_LEN + 1)
-#define WAL_LOG_SUFFIX "log"
+#define WAL_SUFFIX_AT    (WAL_NOSUFFIX_LEN + 1)
+#define WAL_LOG_SUFFIX   "log"
 #define WAL_INDEX_SUFFIX "idx"
-#define WAL_REFRESH_MS 1000
-#define WAL_MAX_SIZE (TSDB_MAX_WAL_SIZE + sizeof(SWalHead))
-#define WAL_PATH_LEN (TSDB_FILENAME_LEN + 12)
-#define WAL_FILE_LEN (WAL_PATH_LEN + 32)
-#define WAL_MAGIC 0xFAFBFCFDULL
+#define WAL_REFRESH_MS   1000
+#define WAL_MAX_SIZE     (TSDB_MAX_WAL_SIZE + sizeof(SWalHead))
+#define WAL_PATH_LEN     (TSDB_FILENAME_LEN + 12)
+#define WAL_FILE_LEN     (WAL_PATH_LEN + 32)
+#define WAL_MAGIC        0xFAFBFCFDULL
 
 #define WAL_CUR_FAILED 1
 
 #pragma pack(push, 1)
 typedef enum { TAOS_WAL_NOLOG = 0, TAOS_WAL_WRITE = 1, TAOS_WAL_FSYNC = 2 } EWalType;
 
+// used by sync module
+typedef struct {
+  int8_t   isWeek;
+  uint64_t seqNum;
+  uint64_t term;
+} SSyncInfo;
+
 typedef struct SWalReadHead {
   int8_t  headVer;
-  int16_t msgType;
   int8_t  reserved;
+  int16_t msgType;
   int32_t len;
   int64_t ingestTs;  // not implemented
   int64_t version;
-  char    body[];
+
+  // sync info
+  SSyncInfo syncInfo;
+
+  char body[];
 } SWalReadHead;
 
 typedef struct {
@@ -117,16 +128,16 @@ typedef struct SWal {
   SWalCfg cfg;
   int32_t fsyncSeq;
   // meta
-  SWalVer vers;
+  SWalVer   vers;
   TdFilePtr pWriteLogTFile;
   TdFilePtr pWriteIdxTFile;
-  int32_t writeCur;
-  SArray *fileInfoSet;
+  int32_t   writeCur;
+  SArray   *fileInfoSet;
   // status
   int64_t totSize;
   int64_t lastRollSeq;
   // ctl
-  int64_t         refId;
+  int64_t       refId;
   TdThreadMutex mutex;
   // path
   char path[WAL_PATH_LEN];
@@ -158,6 +169,7 @@ int32_t walAlter(SWal *, SWalCfg *pCfg);
 void    walClose(SWal *);
 
 // write
+int64_t walWriteWithSyncInfo(SWal *, int64_t index, tmsg_t msgType, SSyncInfo info, const void *body, int32_t bodyLen);
 int64_t walWrite(SWal *, int64_t index, tmsg_t msgType, const void *body, int32_t bodyLen);
 void    walFsync(SWal *, bool force);
 
diff --git a/source/client/stream/stream.c b/source/client/stream/stream.c
deleted file mode 100644
index 6dea4a4e57392be988126c579648f39a8270b9bf..0000000000000000000000000000000000000000
--- a/source/client/stream/stream.c
+++ /dev/null
@@ -1,14 +0,0 @@
-/*
- * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
- *
- * This program is free software: you can use, redistribute, and/or modify
- * it under the terms of the GNU Affero General Public License, version 3
- * or later ("AGPL"), as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
\ No newline at end of file
diff --git a/source/libs/wal/src/walWrite.c b/source/libs/wal/src/walWrite.c
index 8392e66e58107914021b14dae9b690d4d24ccf09..e1b347d2b8215ff420676827a0ad0bd5cb901415 100644
--- a/source/libs/wal/src/walWrite.c
+++ b/source/libs/wal/src/walWrite.c
@@ -253,7 +253,8 @@ static int walWriteIndex(SWal *pWal, int64_t ver, int64_t offset) {
   return 0;
 }
 
-int64_t walWrite(SWal *pWal, int64_t index, tmsg_t msgType, const void *body, int32_t bodyLen) {
+int64_t walWriteWithSyncInfo(SWal *pWal, int64_t index, tmsg_t msgType, SSyncInfo syncInfo, const void *body,
+                             int32_t bodyLen) {
   if (pWal == NULL) return -1;
   int code = 0;
 
@@ -296,6 +297,10 @@ int64_t walWrite(SWal *pWal, int64_t index, tmsg_t msgType, const void *body, in
   int64_t offset = walGetCurFileOffset(pWal);
   pWal->writeHead.head.len = bodyLen;
   pWal->writeHead.head.msgType = msgType;
+
+  // sync info
+  pWal->writeHead.head.syncInfo = syncInfo;
+
   pWal->writeHead.cksumHead = walCalcHeadCksum(&pWal->writeHead);
   pWal->writeHead.cksumBody = walCalcBodyCksum(body, bodyLen);
 
@@ -332,6 +337,15 @@ int64_t walWrite(SWal *pWal, int64_t index, tmsg_t msgType, const void *body, in
   return 0;
 }
 
+int64_t walWrite(SWal *pWal, int64_t index, tmsg_t msgType, const void *body, int32_t bodyLen) {
+  SSyncInfo info = {
+      .isWeek = -1,
+      .seqNum = UINT64_MAX,
+      .term = UINT64_MAX,
+  };
+  return walWriteWithSyncInfo(pWal, index, msgType, info, body, bodyLen);
+}
+
 void walFsync(SWal *pWal, bool forceFsync) {
   if (forceFsync || (pWal->cfg.level == TAOS_WAL_FSYNC && pWal->cfg.fsyncPeriod == 0)) {
     wTrace("vgId:%d, fileId:%" PRId64 ".log, do fsync", pWal->cfg.vgId, walGetCurFileFirstVer(pWal));