diff --git a/include/common/tmsgdef.h b/include/common/tmsgdef.h
index a12a635837..f4890206fe 100644
--- a/include/common/tmsgdef.h
+++ b/include/common/tmsgdef.h
@@ -250,8 +250,8 @@ enum {
 
   TD_NEW_MSG_SEG(TDMT_SYNC_MSG)
   TD_DEF_MSG_TYPE(TDMT_SYNC_TIMEOUT, "sync-timer", NULL, NULL)
-  TD_DEF_MSG_TYPE(TDMT_SYNC_PING, "sync-ping", NULL, NULL)
-  TD_DEF_MSG_TYPE(TDMT_SYNC_PING_REPLY, "sync-ping-reply", NULL, NULL)
+  TD_DEF_MSG_TYPE(TDMT_SYNC_PING, "sync-ping", NULL, NULL)             // no longer used
+  TD_DEF_MSG_TYPE(TDMT_SYNC_PING_REPLY, "sync-ping-reply", NULL, NULL) // no longer used
   TD_DEF_MSG_TYPE(TDMT_SYNC_CLIENT_REQUEST, "sync-client-request", NULL, NULL)
   TD_DEF_MSG_TYPE(TDMT_SYNC_CLIENT_REQUEST_BATCH, "sync-client-request-batch", NULL, NULL)
   TD_DEF_MSG_TYPE(TDMT_SYNC_CLIENT_REQUEST_REPLY, "sync-client-request-reply", NULL, NULL)
diff --git a/source/dnode/mgmt/mgmt_mnode/src/mmHandle.c b/source/dnode/mgmt/mgmt_mnode/src/mmHandle.c
index ec4f42c847..a322f76800 100644
--- a/source/dnode/mgmt/mgmt_mnode/src/mmHandle.c
+++ b/source/dnode/mgmt/mgmt_mnode/src/mmHandle.c
@@ -183,8 +183,6 @@ SArray *mmGetMsgHandles() {
   if (dmSetMgmtHandle(pArray, TDMT_VND_COMPACT_RSP, mmPutMsgToWriteQueue, 0) == NULL) goto _OVER;
 
   if (dmSetMgmtHandle(pArray, TDMT_SYNC_TIMEOUT, mmPutMsgToSyncQueue, 1) == NULL) goto _OVER;
-  if (dmSetMgmtHandle(pArray, TDMT_SYNC_PING, mmPutMsgToSyncQueue, 1) == NULL) goto _OVER;
-  if (dmSetMgmtHandle(pArray, TDMT_SYNC_PING_REPLY, mmPutMsgToSyncQueue, 1) == NULL) goto _OVER;
   if (dmSetMgmtHandle(pArray, TDMT_SYNC_CLIENT_REQUEST, mmPutMsgToSyncQueue, 1) == NULL) goto _OVER;
   if (dmSetMgmtHandle(pArray, TDMT_SYNC_CLIENT_REQUEST_BATCH, mmPutMsgToSyncQueue, 1) == NULL) goto _OVER;
   if (dmSetMgmtHandle(pArray, TDMT_SYNC_CLIENT_REQUEST_REPLY, mmPutMsgToSyncQueue, 1) == NULL) goto _OVER;
diff --git a/source/dnode/mgmt/mgmt_vnode/src/vmHandle.c b/source/dnode/mgmt/mgmt_vnode/src/vmHandle.c
index 2265f58060..e15d7ac3df 100644
--- a/source/dnode/mgmt/mgmt_vnode/src/vmHandle.c
+++ b/source/dnode/mgmt/mgmt_vnode/src/vmHandle.c
@@ -450,8 +450,6 @@ SArray *vmGetMsgHandles() {
   if (dmSetMgmtHandle(pArray, TDMT_DND_DROP_VNODE, vmPutMsgToMgmtQueue, 0) == NULL) goto _OVER;
 
   if (dmSetMgmtHandle(pArray, TDMT_SYNC_TIMEOUT, vmPutMsgToSyncQueue, 0) == NULL) goto _OVER;
-  if (dmSetMgmtHandle(pArray, TDMT_SYNC_PING, vmPutMsgToSyncQueue, 0) == NULL) goto _OVER;
-  if (dmSetMgmtHandle(pArray, TDMT_SYNC_PING_REPLY, vmPutMsgToSyncQueue, 0) == NULL) goto _OVER;
   if (dmSetMgmtHandle(pArray, TDMT_SYNC_CLIENT_REQUEST, vmPutMsgToSyncQueue, 0) == NULL) goto _OVER;
   if (dmSetMgmtHandle(pArray, TDMT_SYNC_CLIENT_REQUEST_BATCH, vmPutMsgToSyncQueue, 0) == NULL) goto _OVER;
   if (dmSetMgmtHandle(pArray, TDMT_SYNC_CLIENT_REQUEST_REPLY, vmPutMsgToSyncQueue, 0) == NULL) goto _OVER;
diff --git a/source/libs/sync/inc/syncInt.h b/source/libs/sync/inc/syncInt.h
index 46bbb14421..d9eefab33f 100644
--- a/source/libs/sync/inc/syncInt.h
+++ b/source/libs/sync/inc/syncInt.h
@@ -67,8 +67,6 @@ extern "C" {
 
 typedef struct SyncTimeout            SyncTimeout;
 typedef struct SyncClientRequest      SyncClientRequest;
-typedef struct SyncPing               SyncPing;
-typedef struct SyncPingReply          SyncPingReply;
 typedef struct SyncRequestVote        SyncRequestVote;
 typedef struct SyncRequestVoteReply   SyncRequestVoteReply;
 typedef struct SyncAppendEntries      SyncAppendEntries;
@@ -93,17 +91,6 @@ typedef struct SyncHeartbeatReply     SyncHeartbeatReply;
 typedef struct SyncHeartbeat          SyncHeartbeat;
 typedef struct SyncPreSnapshot        SyncPreSnapshot;
 
-typedef int32_t (*FpOnPingCb)(SSyncNode* ths, SyncPing* pMsg);
-typedef int32_t (*FpOnPingReplyCb)(SSyncNode* ths, SyncPingReply* pMsg);
-typedef int32_t (*FpOnClientRequestCb)(SSyncNode* ths, SRpcMsg* pMsg, SyncIndex* pRetIndex);
-typedef int32_t (*FpOnRequestVoteCb)(SSyncNode* ths, SyncRequestVote* pMsg);
-typedef int32_t (*FpOnRequestVoteReplyCb)(SSyncNode* ths, SyncRequestVoteReply* pMsg);
-typedef int32_t (*FpOnAppendEntriesCb)(SSyncNode* ths, SyncAppendEntries* pMsg);
-typedef int32_t (*FpOnAppendEntriesReplyCb)(SSyncNode* ths, SyncAppendEntriesReply* pMsg);
-typedef int32_t (*FpOnTimeoutCb)(SSyncNode* pSyncNode, SyncTimeout* pMsg);
-typedef int32_t (*FpOnSnapshotCb)(SSyncNode* ths, SyncSnapshotSend* pMsg);
-typedef int32_t (*FpOnSnapshotReplyCb)(SSyncNode* ths, SyncSnapshotRsp* pMsg);
-
 extern bool gRaftDetailLog;
 
 typedef struct SRaftId {
@@ -220,18 +207,6 @@ typedef struct SSyncNode {
   // peer heartbeat timer
   SSyncTimer peerHeartbeatTimerArr[TSDB_MAX_REPLICA];
 
-  // callback
-  FpOnPingCb               FpOnPing;
-  FpOnPingReplyCb          FpOnPingReply;
-  FpOnClientRequestCb      FpOnClientRequest;
-  FpOnTimeoutCb            FpOnTimeout;
-  FpOnRequestVoteCb        FpOnRequestVote;
-  FpOnRequestVoteReplyCb   FpOnRequestVoteReply;
-  FpOnAppendEntriesCb      FpOnAppendEntries;
-  FpOnAppendEntriesReplyCb FpOnAppendEntriesReply;
-  FpOnSnapshotCb           FpOnSnapshot;
-  FpOnSnapshotReplyCb      FpOnSnapshotReply;
-
   // tools
   SSyncRespMgr* pSyncRespMgr;
 
@@ -269,12 +244,6 @@ bool          syncNodeSnapshotEnable(SSyncNode* pSyncNode);
 ESyncStrategy syncNodeStrategy(SSyncNode* pSyncNode);
 SyncIndex     syncNodeGetSnapshotConfigIndex(SSyncNode* pSyncNode, SyncIndex snapshotLastApplyIndex);
 
-// ping --------------
-int32_t syncNodePing(SSyncNode* pSyncNode, const SRaftId* destRaftId, SyncPing* pMsg);
-int32_t syncNodePingSelf(SSyncNode* pSyncNode);
-int32_t syncNodePingPeers(SSyncNode* pSyncNode);
-int32_t syncNodePingAll(SSyncNode* pSyncNode);
-
 // timer control --------------
 int32_t syncNodeStartPingTimer(SSyncNode* pSyncNode);
 int32_t syncNodeStopPingTimer(SSyncNode* pSyncNode);
diff --git a/source/libs/sync/inc/syncMessage.h b/source/libs/sync/inc/syncMessage.h
index 7dc04d0b86..2110c80df3 100644
--- a/source/libs/sync/inc/syncMessage.h
+++ b/source/libs/sync/inc/syncMessage.h
@@ -22,60 +22,6 @@ extern "C" {
 
 #include "syncInt.h"
 
-// ---------------------------------------------
-typedef struct SyncPing {
-  uint32_t bytes;
-  int32_t  vgId;
-  uint32_t msgType;
-  SRaftId  srcId;
-  SRaftId  destId;
-  // private data
-  uint32_t dataLen;
-  char     data[];
-} SyncPing;
-
-
-void      syncPingDestroy(SyncPing* pMsg);
-void      syncPingSerialize(const SyncPing* pMsg, char* buf, uint32_t bufLen);
-void      syncPingDeserialize(const char* buf, uint32_t len, SyncPing* pMsg);
-SyncPing* syncPingDeserialize2(const char* buf, uint32_t len);
-SyncPing* syncPingFromRpcMsg2(const SRpcMsg* pRpcMsg);
-
-// ---------------------------------------------
-typedef struct SyncPingReply {
-  uint32_t bytes;
-  int32_t  vgId;
-  uint32_t msgType;
-  SRaftId  srcId;
-  SRaftId  destId;
-  // private data
-  uint32_t dataLen;
-  char     data[];
-} SyncPingReply;
-
-SyncPingReply* syncPingReplyBuild(uint32_t dataLen);
-SyncPingReply* syncPingReplyBuild2(const SRaftId* srcId, const SRaftId* destId, int32_t vgId, const char* str);
-SyncPingReply* syncPingReplyBuild3(const SRaftId* srcId, const SRaftId* destId, int32_t vgId);
-void           syncPingReplyDestroy(SyncPingReply* pMsg);
-void           syncPingReplySerialize(const SyncPingReply* pMsg, char* buf, uint32_t bufLen);
-void           syncPingReplyDeserialize(const char* buf, uint32_t len, SyncPingReply* pMsg);
-char*          syncPingReplySerialize2(const SyncPingReply* pMsg, uint32_t* len);
-SyncPingReply* syncPingReplyDeserialize2(const char* buf, uint32_t len);
-int32_t        syncPingReplySerialize3(const SyncPingReply* pMsg, char* buf, int32_t bufLen);
-SyncPingReply* syncPingReplyDeserialize3(void* buf, int32_t bufLen);
-void           syncPingReply2RpcMsg(const SyncPingReply* pMsg, SRpcMsg* pRpcMsg);
-void           syncPingReplyFromRpcMsg(const SRpcMsg* pRpcMsg, SyncPingReply* pMsg);
-SyncPingReply* syncPingReplyFromRpcMsg2(const SRpcMsg* pRpcMsg);
-cJSON*         syncPingReply2Json(const SyncPingReply* pMsg);
-char*          syncPingReply2Str(const SyncPingReply* pMsg);
-
-// for debug ----------------------
-void syncPingReplyPrint(const SyncPingReply* pMsg);
-void syncPingReplyPrint2(char* s, const SyncPingReply* pMsg);
-void syncPingReplyLog(const SyncPingReply* pMsg);
-void syncPingReplyLog2(char* s, const SyncPingReply* pMsg);
-
-// ---------------------------------------------
 typedef enum ESyncTimeoutType {
   SYNC_TIMEOUT_PING = 100,
   SYNC_TIMEOUT_ELECTION,
@@ -656,8 +602,6 @@ void syncLocalCmdLog(const SyncLocalCmd* pMsg);
 void syncLocalCmdLog2(char* s, const SyncLocalCmd* pMsg);
 
 // on message ----------------------
-int32_t syncNodeOnPing(SSyncNode* ths, SyncPing* pMsg);
-int32_t syncNodeOnPingReply(SSyncNode* ths, SyncPingReply* pMsg);
 
 int32_t syncNodeOnRequestVote(SSyncNode* ths, SyncRequestVote* pMsg);
 int32_t syncNodeOnRequestVoteReply(SSyncNode* ths, SyncRequestVoteReply* pMsg);
diff --git a/source/libs/sync/src/syncMain.c b/source/libs/sync/src/syncMain.c
index 25f6c5e6f1..c9e6885e50 100644
--- a/source/libs/sync/src/syncMain.c
+++ b/source/libs/sync/src/syncMain.c
@@ -145,14 +145,6 @@ int32_t syncProcessMsg(int64_t rid, SRpcMsg* pMsg) {
     SyncTimeout* pSyncMsg = syncTimeoutFromRpcMsg2(pMsg);
     code = syncNodeOnTimer(pSyncNode, pSyncMsg);
     syncTimeoutDestroy(pSyncMsg);
-  } else if (pMsg->msgType == TDMT_SYNC_PING) {
-    SyncPing* pSyncMsg = syncPingFromRpcMsg2(pMsg);
-    code = syncNodeOnPing(pSyncNode, pSyncMsg);
-    syncPingDestroy(pSyncMsg);
-  } else if (pMsg->msgType == TDMT_SYNC_PING_REPLY) {
-    SyncPingReply* pSyncMsg = syncPingReplyFromRpcMsg2(pMsg);
-    code = syncNodeOnPingReply(pSyncNode, pSyncMsg);
-    syncPingReplyDestroy(pSyncMsg);
   } else if (pMsg->msgType == TDMT_SYNC_CLIENT_REQUEST) {
     code = syncNodeOnClientRequest(pSyncNode, pMsg, NULL);
   } else if (pMsg->msgType == TDMT_SYNC_REQUEST_VOTE) {
@@ -906,18 +898,6 @@ SSyncNode* syncNodeOpen(SSyncInfo* pSyncInfo) {
     syncHbTimerInit(pSyncNode, &(pSyncNode->peerHeartbeatTimerArr[i]), (pSyncNode->replicasId)[i]);
   }
 
-  // init callback
-  pSyncNode->FpOnPing = syncNodeOnPing;
-  pSyncNode->FpOnPingReply = syncNodeOnPingReply;
-  pSyncNode->FpOnClientRequest = syncNodeOnClientRequest;
-  pSyncNode->FpOnTimeout = syncNodeOnTimer;
-  pSyncNode->FpOnSnapshot = syncNodeOnSnapshot;
-  pSyncNode->FpOnSnapshotReply = syncNodeOnSnapshotReply;
-  pSyncNode->FpOnRequestVote = syncNodeOnRequestVote;
-  pSyncNode->FpOnRequestVoteReply = syncNodeOnRequestVoteReply;
-  pSyncNode->FpOnAppendEntries = syncNodeOnAppendEntries;
-  pSyncNode->FpOnAppendEntriesReply = syncNodeOnAppendEntriesReply;
-
   // tools
   pSyncNode->pSyncRespMgr = syncRespMgrCreate(pSyncNode, SYNC_RESP_TTL_MS);
   if (pSyncNode->pSyncRespMgr == NULL) {
@@ -2062,33 +2042,6 @@ static int32_t syncNodeAppendNoop(SSyncNode* ths) {
   return ret;
 }
 
-// on message ----
-int32_t syncNodeOnPing(SSyncNode* ths, SyncPing* pMsg) {
-  sTrace("vgId:%d, recv sync-ping", ths->vgId);
-
-  SyncPingReply* pMsgReply = syncPingReplyBuild3(&ths->myRaftId, &pMsg->srcId, ths->vgId);
-  SRpcMsg        rpcMsg;
-  syncPingReply2RpcMsg(pMsgReply, &rpcMsg);
-
-  /*
-    // htonl
-    SMsgHead* pHead = rpcMsg.pCont;
-    pHead->contLen = htonl(pHead->contLen);
-    pHead->vgId = htonl(pHead->vgId);
-  */
-
-  syncNodeSendMsgById(&pMsgReply->destId, ths, &rpcMsg);
-  syncPingReplyDestroy(pMsgReply);
-
-  return 0;
-}
-
-int32_t syncNodeOnPingReply(SSyncNode* ths, SyncPingReply* pMsg) {
-  int32_t ret = 0;
-  sTrace("vgId:%d, recv sync-ping-reply", ths->vgId);
-  return ret;
-}
-
 int32_t syncNodeOnHeartbeat(SSyncNode* ths, SyncHeartbeat* pMsg) {
   syncLogRecvHeartbeat(ths, pMsg, "");
 
diff --git a/source/libs/sync/src/syncMessage.c b/source/libs/sync/src/syncMessage.c
index 565b21eb55..74f4a19f81 100644
--- a/source/libs/sync/src/syncMessage.c
+++ b/source/libs/sync/src/syncMessage.c
@@ -152,309 +152,6 @@ void syncTimeoutLog2(char* s, const SyncTimeout* pMsg) {
 }
 
 
-void syncPingDestroy(SyncPing* pMsg) {
-  if (pMsg != NULL) {
-    taosMemoryFree(pMsg);
-  }
-}
-
-void syncPingSerialize(const SyncPing* pMsg, char* buf, uint32_t bufLen) {
-  ASSERT(pMsg->bytes <= bufLen);
-  memcpy(buf, pMsg, pMsg->bytes);
-}
-
-void syncPingDeserialize(const char* buf, uint32_t len, SyncPing* pMsg) {
-  memcpy(pMsg, buf, len);
-  ASSERT(len == pMsg->bytes);
-  ASSERT(pMsg->bytes == sizeof(SyncPing) + pMsg->dataLen);
-}
-
-SyncPing* syncPingDeserialize2(const char* buf, uint32_t len) {
-  uint32_t  bytes = *((uint32_t*)buf);
-  SyncPing* pMsg = taosMemoryMalloc(bytes);
-  ASSERT(pMsg != NULL);
-  syncPingDeserialize(buf, len, pMsg);
-  ASSERT(len == pMsg->bytes);
-  return pMsg;
-}
-
-
-SyncPing* syncPingFromRpcMsg2(const SRpcMsg* pRpcMsg) {
-  SyncPing* pMsg = syncPingDeserialize2(pRpcMsg->pCont, pRpcMsg->contLen);
-  ASSERT(pMsg != NULL);
-  return pMsg;
-}
-
-// ---- message process SyncPingReply----
-SyncPingReply* syncPingReplyBuild(uint32_t dataLen) {
-  uint32_t       bytes = sizeof(SyncPingReply) + dataLen;
-  SyncPingReply* pMsg = taosMemoryMalloc(bytes);
-  memset(pMsg, 0, bytes);
-  pMsg->bytes = bytes;
-  pMsg->msgType = TDMT_SYNC_PING_REPLY;
-  pMsg->dataLen = dataLen;
-  return pMsg;
-}
-
-SyncPingReply* syncPingReplyBuild2(const SRaftId* srcId, const SRaftId* destId, int32_t vgId, const char* str) {
-  uint32_t       dataLen = strlen(str) + 1;
-  SyncPingReply* pMsg = syncPingReplyBuild(dataLen);
-  pMsg->vgId = vgId;
-  pMsg->srcId = *srcId;
-  pMsg->destId = *destId;
-  snprintf(pMsg->data, pMsg->dataLen, "%s", str);
-  return pMsg;
-}
-
-SyncPingReply* syncPingReplyBuild3(const SRaftId* srcId, const SRaftId* destId, int32_t vgId) {
-  SyncPingReply* pMsg = syncPingReplyBuild2(srcId, destId, vgId, "pang");
-  return pMsg;
-}
-
-void syncPingReplyDestroy(SyncPingReply* pMsg) {
-  if (pMsg != NULL) {
-    taosMemoryFree(pMsg);
-  }
-}
-
-void syncPingReplySerialize(const SyncPingReply* pMsg, char* buf, uint32_t bufLen) {
-  ASSERT(pMsg->bytes <= bufLen);
-  memcpy(buf, pMsg, pMsg->bytes);
-}
-
-void syncPingReplyDeserialize(const char* buf, uint32_t len, SyncPingReply* pMsg) {
-  memcpy(pMsg, buf, len);
-  ASSERT(len == pMsg->bytes);
-  ASSERT(pMsg->bytes == sizeof(SyncPingReply) + pMsg->dataLen);
-}
-
-char* syncPingReplySerialize2(const SyncPingReply* pMsg, uint32_t* len) {
-  char* buf = taosMemoryMalloc(pMsg->bytes);
-  ASSERT(buf != NULL);
-  syncPingReplySerialize(pMsg, buf, pMsg->bytes);
-  if (len != NULL) {
-    *len = pMsg->bytes;
-  }
-  return buf;
-}
-
-SyncPingReply* syncPingReplyDeserialize2(const char* buf, uint32_t len) {
-  uint32_t       bytes = *((uint32_t*)buf);
-  SyncPingReply* pMsg = taosMemoryMalloc(bytes);
-  ASSERT(pMsg != NULL);
-  syncPingReplyDeserialize(buf, len, pMsg);
-  ASSERT(len == pMsg->bytes);
-  return pMsg;
-}
-
-int32_t syncPingReplySerialize3(const SyncPingReply* pMsg, char* buf, int32_t bufLen) {
-  SEncoder encoder = {0};
-  tEncoderInit(&encoder, buf, bufLen);
-  if (tStartEncode(&encoder) < 0) {
-    return -1;
-  }
-
-  if (tEncodeU32(&encoder, pMsg->bytes) < 0) {
-    return -1;
-  }
-  if (tEncodeI32(&encoder, pMsg->vgId) < 0) {
-    return -1;
-  }
-  if (tEncodeU32(&encoder, pMsg->msgType) < 0) {
-    return -1;
-  }
-  if (tEncodeU64(&encoder, pMsg->srcId.addr) < 0) {
-    return -1;
-  }
-  if (tEncodeI32(&encoder, pMsg->srcId.vgId) < 0) {
-    return -1;
-  }
-  if (tEncodeU64(&encoder, pMsg->destId.addr) < 0) {
-    return -1;
-  }
-  if (tEncodeI32(&encoder, pMsg->destId.vgId) < 0) {
-    return -1;
-  }
-  if (tEncodeU32(&encoder, pMsg->dataLen) < 0) {
-    return -1;
-  }
-  if (tEncodeBinary(&encoder, pMsg->data, pMsg->dataLen)) {
-    return -1;
-  }
-
-  tEndEncode(&encoder);
-  int32_t tlen = encoder.pos;
-  tEncoderClear(&encoder);
-  return tlen;
-}
-
-SyncPingReply* syncPingReplyDeserialize3(void* buf, int32_t bufLen) {
-  SDecoder decoder = {0};
-  tDecoderInit(&decoder, buf, bufLen);
-  if (tStartDecode(&decoder) < 0) {
-    return NULL;
-  }
-
-  SyncPingReply* pMsg = NULL;
-  uint32_t       bytes;
-  if (tDecodeU32(&decoder, &bytes) < 0) {
-    return NULL;
-  }
-
-  pMsg = taosMemoryMalloc(bytes);
-  ASSERT(pMsg != NULL);
-  pMsg->bytes = bytes;
-
-  if (tDecodeI32(&decoder, &pMsg->vgId) < 0) {
-    taosMemoryFree(pMsg);
-    return NULL;
-  }
-  if (tDecodeU32(&decoder, &pMsg->msgType) < 0) {
-    taosMemoryFree(pMsg);
-    return NULL;
-  }
-  if (tDecodeU64(&decoder, &pMsg->srcId.addr) < 0) {
-    taosMemoryFree(pMsg);
-    return NULL;
-  }
-  if (tDecodeI32(&decoder, &pMsg->srcId.vgId) < 0) {
-    taosMemoryFree(pMsg);
-    return NULL;
-  }
-  if (tDecodeU64(&decoder, &pMsg->destId.addr) < 0) {
-    taosMemoryFree(pMsg);
-    return NULL;
-  }
-  if (tDecodeI32(&decoder, &pMsg->destId.vgId) < 0) {
-    taosMemoryFree(pMsg);
-    return NULL;
-  }
-  if (tDecodeU32(&decoder, &pMsg->dataLen) < 0) {
-    taosMemoryFree(pMsg);
-    return NULL;
-  }
-  uint32_t len;
-  char*    data = NULL;
-  if (tDecodeBinary(&decoder, (uint8_t**)(&data), &len) < 0) {
-    taosMemoryFree(pMsg);
-    return NULL;
-  }
-  ASSERT(len == pMsg->dataLen);
-  memcpy(pMsg->data, data, len);
-
-  tEndDecode(&decoder);
-  tDecoderClear(&decoder);
-  return pMsg;
-}
-
-void syncPingReply2RpcMsg(const SyncPingReply* pMsg, SRpcMsg* pRpcMsg) {
-  memset(pRpcMsg, 0, sizeof(*pRpcMsg));
-  pRpcMsg->msgType = pMsg->msgType;
-  pRpcMsg->contLen = pMsg->bytes;
-  pRpcMsg->pCont = rpcMallocCont(pRpcMsg->contLen);
-  syncPingReplySerialize(pMsg, pRpcMsg->pCont, pRpcMsg->contLen);
-}
-
-void syncPingReplyFromRpcMsg(const SRpcMsg* pRpcMsg, SyncPingReply* pMsg) {
-  syncPingReplyDeserialize(pRpcMsg->pCont, pRpcMsg->contLen, pMsg);
-}
-
-SyncPingReply* syncPingReplyFromRpcMsg2(const SRpcMsg* pRpcMsg) {
-  SyncPingReply* pMsg = syncPingReplyDeserialize2(pRpcMsg->pCont, pRpcMsg->contLen);
-  ASSERT(pMsg != NULL);
-  return pMsg;
-}
-
-cJSON* syncPingReply2Json(const SyncPingReply* pMsg) {
-  char   u64buf[128] = {0};
-  cJSON* pRoot = cJSON_CreateObject();
-
-  if (pMsg != NULL) {
-    cJSON_AddNumberToObject(pRoot, "bytes", pMsg->bytes);
-    cJSON_AddNumberToObject(pRoot, "vgId", pMsg->vgId);
-    cJSON_AddNumberToObject(pRoot, "msgType", pMsg->msgType);
-
-    cJSON* pSrcId = cJSON_CreateObject();
-    snprintf(u64buf, sizeof(u64buf), "%" PRIu64, pMsg->srcId.addr);
-    cJSON_AddStringToObject(pSrcId, "addr", u64buf);
-    {
-      uint64_t u64 = pMsg->srcId.addr;
-      cJSON*   pTmp = pSrcId;
-      char     host[128] = {0};
-      uint16_t port;
-      syncUtilU642Addr(u64, host, sizeof(host), &port);
-      cJSON_AddStringToObject(pTmp, "addr_host", host);
-      cJSON_AddNumberToObject(pTmp, "addr_port", port);
-    }
-    cJSON_AddNumberToObject(pSrcId, "vgId", pMsg->srcId.vgId);
-    cJSON_AddItemToObject(pRoot, "srcId", pSrcId);
-
-    cJSON* pDestId = cJSON_CreateObject();
-    snprintf(u64buf, sizeof(u64buf), "%" PRIu64, pMsg->destId.addr);
-    cJSON_AddStringToObject(pDestId, "addr", u64buf);
-    {
-      uint64_t u64 = pMsg->destId.addr;
-      cJSON*   pTmp = pDestId;
-      char     host[128] = {0};
-      uint16_t port;
-      syncUtilU642Addr(u64, host, sizeof(host), &port);
-      cJSON_AddStringToObject(pTmp, "addr_host", host);
-      cJSON_AddNumberToObject(pTmp, "addr_port", port);
-    }
-    cJSON_AddNumberToObject(pDestId, "vgId", pMsg->destId.vgId);
-    cJSON_AddItemToObject(pRoot, "destId", pDestId);
-
-    cJSON_AddNumberToObject(pRoot, "dataLen", pMsg->dataLen);
-    char* s;
-    s = syncUtilPrintBin((char*)(pMsg->data), pMsg->dataLen);
-    cJSON_AddStringToObject(pRoot, "data", s);
-    taosMemoryFree(s);
-    s = syncUtilPrintBin2((char*)(pMsg->data), pMsg->dataLen);
-    cJSON_AddStringToObject(pRoot, "data2", s);
-    taosMemoryFree(s);
-  }
-
-  cJSON* pJson = cJSON_CreateObject();
-  cJSON_AddItemToObject(pJson, "SyncPingReply", pRoot);
-  return pJson;
-}
-
-char* syncPingReply2Str(const SyncPingReply* pMsg) {
-  cJSON* pJson = syncPingReply2Json(pMsg);
-  char*  serialized = cJSON_Print(pJson);
-  cJSON_Delete(pJson);
-  return serialized;
-}
-
-// for debug ----------------------
-void syncPingReplyPrint(const SyncPingReply* pMsg) {
-  char* serialized = syncPingReply2Str(pMsg);
-  printf("syncPingReplyPrint | len:%zu | %s \n", strlen(serialized), serialized);
-  fflush(NULL);
-  taosMemoryFree(serialized);
-}
-
-void syncPingReplyPrint2(char* s, const SyncPingReply* pMsg) {
-  char* serialized = syncPingReply2Str(pMsg);
-  printf("syncPingReplyPrint2 | len:%zu | %s | %s \n", strlen(serialized), s, serialized);
-  fflush(NULL);
-  taosMemoryFree(serialized);
-}
-
-void syncPingReplyLog(const SyncPingReply* pMsg) {
-  char* serialized = syncPingReply2Str(pMsg);
-  sTrace("syncPingReplyLog | len:%zu | %s", strlen(serialized), serialized);
-  taosMemoryFree(serialized);
-}
-
-void syncPingReplyLog2(char* s, const SyncPingReply* pMsg) {
-  if (gRaftDetailLog) {
-    char* serialized = syncPingReply2Str(pMsg);
-    sTrace("syncPingReplyLog2 | len:%zu | %s | %s", strlen(serialized), s, serialized);
-    taosMemoryFree(serialized);
-  }
-}
-
 // ---- message process SyncClientRequest----
 SyncClientRequest* syncClientRequestAlloc(uint32_t dataLen) {
   uint32_t           bytes = sizeof(SyncClientRequest) + dataLen;
diff --git a/source/libs/sync/test/syncConfigChangeSnapshotTest.cpp b/source/libs/sync/test/syncConfigChangeSnapshotTest.cpp
index c29def9ca3..057f2ea6dd 100644
--- a/source/libs/sync/test/syncConfigChangeSnapshotTest.cpp
+++ b/source/libs/sync/test/syncConfigChangeSnapshotTest.cpp
@@ -223,18 +223,18 @@ int64_t createSyncNode(int32_t replicaNum, int32_t myIndex, int32_t vgId, SWal*
 
   SSyncNode* pSyncNode = (SSyncNode*)syncNodeAcquire(rid);
   assert(pSyncNode != NULL);
-  gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
-  gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
-  gSyncIO->FpOnSyncTimeout = pSyncNode->FpOnTimeout;
-  gSyncIO->FpOnSyncClientRequest = pSyncNode->FpOnClientRequest;
+  // gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
+  // gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
+  // gSyncIO->FpOnSyncTimeout = pSyncNode->FpOnTimeout;
+  // gSyncIO->FpOnSyncClientRequest = pSyncNode->FpOnClientRequest;
 
-  gSyncIO->FpOnSyncRequestVote = pSyncNode->FpOnRequestVote;
-  gSyncIO->FpOnSyncRequestVoteReply = pSyncNode->FpOnRequestVoteReply;
-  gSyncIO->FpOnSyncAppendEntries = pSyncNode->FpOnAppendEntries;
-  gSyncIO->FpOnSyncAppendEntriesReply = pSyncNode->FpOnAppendEntriesReply;
+  // gSyncIO->FpOnSyncRequestVote = pSyncNode->FpOnRequestVote;
+  // gSyncIO->FpOnSyncRequestVoteReply = pSyncNode->FpOnRequestVoteReply;
+  // gSyncIO->FpOnSyncAppendEntries = pSyncNode->FpOnAppendEntries;
+  // gSyncIO->FpOnSyncAppendEntriesReply = pSyncNode->FpOnAppendEntriesReply;
 
-  gSyncIO->FpOnSyncSnapshot = pSyncNode->FpOnSnapshot;
-  gSyncIO->FpOnSyncSnapshotReply = pSyncNode->FpOnSnapshotReply;
+  // gSyncIO->FpOnSyncSnapshot = pSyncNode->FpOnSnapshot;
+  // gSyncIO->FpOnSyncSnapshotReply = pSyncNode->FpOnSnapshotReply;
 
   gSyncIO->pSyncNode = pSyncNode;
   syncNodeRelease(pSyncNode);
diff --git a/source/libs/sync/test/syncConfigChangeTest.cpp b/source/libs/sync/test/syncConfigChangeTest.cpp
index 23acadc0cc..bab3d2236f 100644
--- a/source/libs/sync/test/syncConfigChangeTest.cpp
+++ b/source/libs/sync/test/syncConfigChangeTest.cpp
@@ -146,16 +146,16 @@ int64_t createSyncNode(int32_t replicaNum, int32_t myIndex, int32_t vgId, SWal*
 
   SSyncNode* pSyncNode = (SSyncNode*)syncNodeAcquire(rid);
   assert(pSyncNode != NULL);
-  gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
-  gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
-  gSyncIO->FpOnSyncRequestVote = pSyncNode->FpOnRequestVote;
-  gSyncIO->FpOnSyncRequestVoteReply = pSyncNode->FpOnRequestVoteReply;
-  gSyncIO->FpOnSyncAppendEntries = pSyncNode->FpOnAppendEntries;
-  gSyncIO->FpOnSyncAppendEntriesReply = pSyncNode->FpOnAppendEntriesReply;
-  gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
-  gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
-  gSyncIO->FpOnSyncTimeout = pSyncNode->FpOnTimeout;
-  gSyncIO->FpOnSyncClientRequest = pSyncNode->FpOnClientRequest;
+  // gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
+  // gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
+  // gSyncIO->FpOnSyncRequestVote = pSyncNode->FpOnRequestVote;
+  // gSyncIO->FpOnSyncRequestVoteReply = pSyncNode->FpOnRequestVoteReply;
+  // gSyncIO->FpOnSyncAppendEntries = pSyncNode->FpOnAppendEntries;
+  // gSyncIO->FpOnSyncAppendEntriesReply = pSyncNode->FpOnAppendEntriesReply;
+  // gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
+  // gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
+  // gSyncIO->FpOnSyncTimeout = pSyncNode->FpOnTimeout;
+  // gSyncIO->FpOnSyncClientRequest = pSyncNode->FpOnClientRequest;
   gSyncIO->pSyncNode = pSyncNode;
   syncNodeRelease(pSyncNode);
 
diff --git a/source/libs/sync/test/syncElectTest.cpp b/source/libs/sync/test/syncElectTest.cpp
index 59d731c823..58c0e7d13a 100644
--- a/source/libs/sync/test/syncElectTest.cpp
+++ b/source/libs/sync/test/syncElectTest.cpp
@@ -59,15 +59,15 @@ SSyncNode* createSyncNode(int32_t replicaNum, int32_t myIndex, int32_t vgId, SWa
   SSyncNode* pSyncNode = syncNodeOpen(&syncInfo);
   assert(pSyncNode != NULL);
 
-  gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
-  gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
-  gSyncIO->FpOnSyncRequestVote = pSyncNode->FpOnRequestVote;
-  gSyncIO->FpOnSyncRequestVoteReply = pSyncNode->FpOnRequestVoteReply;
-  gSyncIO->FpOnSyncAppendEntries = pSyncNode->FpOnAppendEntries;
-  gSyncIO->FpOnSyncAppendEntriesReply = pSyncNode->FpOnAppendEntriesReply;
-  gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
-  gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
-  gSyncIO->FpOnSyncTimeout = pSyncNode->FpOnTimeout;
+  // gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
+  // gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
+  // gSyncIO->FpOnSyncRequestVote = pSyncNode->FpOnRequestVote;
+  // gSyncIO->FpOnSyncRequestVoteReply = pSyncNode->FpOnRequestVoteReply;
+  // gSyncIO->FpOnSyncAppendEntries = pSyncNode->FpOnAppendEntries;
+  // gSyncIO->FpOnSyncAppendEntriesReply = pSyncNode->FpOnAppendEntriesReply;
+  // gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
+  // gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
+  // gSyncIO->FpOnSyncTimeout = pSyncNode->FpOnTimeout;
   gSyncIO->pSyncNode = pSyncNode;
 
   syncNodeStart(pSyncNode);
diff --git a/source/libs/sync/test/syncEnqTest.cpp b/source/libs/sync/test/syncEnqTest.cpp
index 54bfb1b387..d2ae46a443 100644
--- a/source/libs/sync/test/syncEnqTest.cpp
+++ b/source/libs/sync/test/syncEnqTest.cpp
@@ -38,15 +38,15 @@ SSyncNode* syncNodeInit() {
   SSyncNode* pSyncNode = syncNodeOpen(&syncInfo);
   assert(pSyncNode != NULL);
 
-  gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
-  gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
-  gSyncIO->FpOnSyncRequestVote = pSyncNode->FpOnRequestVote;
-  gSyncIO->FpOnSyncRequestVoteReply = pSyncNode->FpOnRequestVoteReply;
-  gSyncIO->FpOnSyncAppendEntries = pSyncNode->FpOnAppendEntries;
-  gSyncIO->FpOnSyncAppendEntriesReply = pSyncNode->FpOnAppendEntriesReply;
-  gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
-  gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
-  gSyncIO->FpOnSyncTimeout = pSyncNode->FpOnTimeout;
+  // gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
+  // gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
+  // gSyncIO->FpOnSyncRequestVote = pSyncNode->FpOnRequestVote;
+  // gSyncIO->FpOnSyncRequestVoteReply = pSyncNode->FpOnRequestVoteReply;
+  // gSyncIO->FpOnSyncAppendEntries = pSyncNode->FpOnAppendEntries;
+  // gSyncIO->FpOnSyncAppendEntriesReply = pSyncNode->FpOnAppendEntriesReply;
+  // gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
+  // gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
+  // gSyncIO->FpOnSyncTimeout = pSyncNode->FpOnTimeout;
   gSyncIO->pSyncNode = pSyncNode;
 
   return pSyncNode;
diff --git a/source/libs/sync/test/syncIOSendMsgTest.cpp b/source/libs/sync/test/syncIOSendMsgTest.cpp
index a082f9373a..ae74929b7b 100644
--- a/source/libs/sync/test/syncIOSendMsgTest.cpp
+++ b/source/libs/sync/test/syncIOSendMsgTest.cpp
@@ -38,15 +38,15 @@ SSyncNode* syncNodeInit() {
   SSyncNode* pSyncNode = syncNodeOpen(&syncInfo);
   assert(pSyncNode != NULL);
 
-  gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
-  gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
-  gSyncIO->FpOnSyncRequestVote = pSyncNode->FpOnRequestVote;
-  gSyncIO->FpOnSyncRequestVoteReply = pSyncNode->FpOnRequestVoteReply;
-  gSyncIO->FpOnSyncAppendEntries = pSyncNode->FpOnAppendEntries;
-  gSyncIO->FpOnSyncAppendEntriesReply = pSyncNode->FpOnAppendEntriesReply;
-  gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
-  gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
-  gSyncIO->FpOnSyncTimeout = pSyncNode->FpOnTimeout;
+  // gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
+  // gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
+  // gSyncIO->FpOnSyncRequestVote = pSyncNode->FpOnRequestVote;
+  // gSyncIO->FpOnSyncRequestVoteReply = pSyncNode->FpOnRequestVoteReply;
+  // gSyncIO->FpOnSyncAppendEntries = pSyncNode->FpOnAppendEntries;
+  // gSyncIO->FpOnSyncAppendEntriesReply = pSyncNode->FpOnAppendEntriesReply;
+  // gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
+  // gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
+  // gSyncIO->FpOnSyncTimeout = pSyncNode->FpOnTimeout;
   gSyncIO->pSyncNode = pSyncNode;
 
   return pSyncNode;
diff --git a/source/libs/sync/test/syncInitTest.cpp b/source/libs/sync/test/syncInitTest.cpp
index b15a767db5..1e0ff54514 100644
--- a/source/libs/sync/test/syncInitTest.cpp
+++ b/source/libs/sync/test/syncInitTest.cpp
@@ -38,14 +38,14 @@ SSyncNode* syncNodeInit() {
   SSyncNode* pSyncNode = syncNodeOpen(&syncInfo);
   assert(pSyncNode != NULL);
 
-  gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
-  gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
-  gSyncIO->FpOnSyncClientRequest = pSyncNode->FpOnClientRequest;
-  gSyncIO->FpOnSyncRequestVote = pSyncNode->FpOnRequestVote;
-  gSyncIO->FpOnSyncRequestVoteReply = pSyncNode->FpOnRequestVoteReply;
-  gSyncIO->FpOnSyncAppendEntries = pSyncNode->FpOnAppendEntries;
-  gSyncIO->FpOnSyncAppendEntriesReply = pSyncNode->FpOnAppendEntriesReply;
-  gSyncIO->FpOnSyncTimeout = pSyncNode->FpOnTimeout;
+  // gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
+  // gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
+  // gSyncIO->FpOnSyncClientRequest = pSyncNode->FpOnClientRequest;
+  // gSyncIO->FpOnSyncRequestVote = pSyncNode->FpOnRequestVote;
+  // gSyncIO->FpOnSyncRequestVoteReply = pSyncNode->FpOnRequestVoteReply;
+  // gSyncIO->FpOnSyncAppendEntries = pSyncNode->FpOnAppendEntries;
+  // gSyncIO->FpOnSyncAppendEntriesReply = pSyncNode->FpOnAppendEntriesReply;
+  // gSyncIO->FpOnSyncTimeout = pSyncNode->FpOnTimeout;
   gSyncIO->pSyncNode = pSyncNode;
 
   return pSyncNode;
diff --git a/source/libs/sync/test/syncPingSelfTest.cpp b/source/libs/sync/test/syncPingSelfTest.cpp
index 19f377e037..975565770a 100644
--- a/source/libs/sync/test/syncPingSelfTest.cpp
+++ b/source/libs/sync/test/syncPingSelfTest.cpp
@@ -39,14 +39,14 @@ SSyncNode* syncNodeInit() {
   SSyncNode* pSyncNode = syncNodeOpen(&syncInfo);
   assert(pSyncNode != NULL);
 
-  gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
-  gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
-  gSyncIO->FpOnSyncClientRequest = pSyncNode->FpOnClientRequest;
-  gSyncIO->FpOnSyncRequestVote = pSyncNode->FpOnRequestVote;
-  gSyncIO->FpOnSyncRequestVoteReply = pSyncNode->FpOnRequestVoteReply;
-  gSyncIO->FpOnSyncAppendEntries = pSyncNode->FpOnAppendEntries;
-  gSyncIO->FpOnSyncAppendEntriesReply = pSyncNode->FpOnAppendEntriesReply;
-  gSyncIO->FpOnSyncTimeout = pSyncNode->FpOnTimeout;
+  // gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
+  // gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
+  // gSyncIO->FpOnSyncClientRequest = pSyncNode->FpOnClientRequest;
+  // gSyncIO->FpOnSyncRequestVote = pSyncNode->FpOnRequestVote;
+  // gSyncIO->FpOnSyncRequestVoteReply = pSyncNode->FpOnRequestVoteReply;
+  // gSyncIO->FpOnSyncAppendEntries = pSyncNode->FpOnAppendEntries;
+  // gSyncIO->FpOnSyncAppendEntriesReply = pSyncNode->FpOnAppendEntriesReply;
+  // gSyncIO->FpOnSyncTimeout = pSyncNode->FpOnTimeout;
   gSyncIO->pSyncNode = pSyncNode;
 
   return pSyncNode;
diff --git a/source/libs/sync/test/syncPingTimerTest.cpp b/source/libs/sync/test/syncPingTimerTest.cpp
index ded7e22eac..8aa4e9dada 100644
--- a/source/libs/sync/test/syncPingTimerTest.cpp
+++ b/source/libs/sync/test/syncPingTimerTest.cpp
@@ -39,14 +39,14 @@ SSyncNode* syncNodeInit() {
   SSyncNode* pSyncNode = syncNodeOpen(&syncInfo);
   assert(pSyncNode != NULL);
 
-  gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
-  gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
-  gSyncIO->FpOnSyncClientRequest = pSyncNode->FpOnClientRequest;
-  gSyncIO->FpOnSyncRequestVote = pSyncNode->FpOnRequestVote;
-  gSyncIO->FpOnSyncRequestVoteReply = pSyncNode->FpOnRequestVoteReply;
-  gSyncIO->FpOnSyncAppendEntries = pSyncNode->FpOnAppendEntries;
-  gSyncIO->FpOnSyncAppendEntriesReply = pSyncNode->FpOnAppendEntriesReply;
-  gSyncIO->FpOnSyncTimeout = pSyncNode->FpOnTimeout;
+  // gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
+  // gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
+  // gSyncIO->FpOnSyncClientRequest = pSyncNode->FpOnClientRequest;
+  // gSyncIO->FpOnSyncRequestVote = pSyncNode->FpOnRequestVote;
+  // gSyncIO->FpOnSyncRequestVoteReply = pSyncNode->FpOnRequestVoteReply;
+  // gSyncIO->FpOnSyncAppendEntries = pSyncNode->FpOnAppendEntries;
+  // gSyncIO->FpOnSyncAppendEntriesReply = pSyncNode->FpOnAppendEntriesReply;
+  // gSyncIO->FpOnSyncTimeout = pSyncNode->FpOnTimeout;
   gSyncIO->pSyncNode = pSyncNode;
 
   return pSyncNode;
diff --git a/source/libs/sync/test/syncPingTimerTest2.cpp b/source/libs/sync/test/syncPingTimerTest2.cpp
index 4f1bb64798..e77358f375 100644
--- a/source/libs/sync/test/syncPingTimerTest2.cpp
+++ b/source/libs/sync/test/syncPingTimerTest2.cpp
@@ -39,14 +39,14 @@ SSyncNode* syncNodeInit() {
   SSyncNode* pSyncNode = syncNodeOpen(&syncInfo);
   assert(pSyncNode != NULL);
 
-  gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
-  gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
-  gSyncIO->FpOnSyncClientRequest = pSyncNode->FpOnClientRequest;
-  gSyncIO->FpOnSyncRequestVote = pSyncNode->FpOnRequestVote;
-  gSyncIO->FpOnSyncRequestVoteReply = pSyncNode->FpOnRequestVoteReply;
-  gSyncIO->FpOnSyncAppendEntries = pSyncNode->FpOnAppendEntries;
-  gSyncIO->FpOnSyncAppendEntriesReply = pSyncNode->FpOnAppendEntriesReply;
-  gSyncIO->FpOnSyncTimeout = pSyncNode->FpOnTimeout;
+  // gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
+  // gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
+  // gSyncIO->FpOnSyncClientRequest = pSyncNode->FpOnClientRequest;
+  // gSyncIO->FpOnSyncRequestVote = pSyncNode->FpOnRequestVote;
+  // gSyncIO->FpOnSyncRequestVoteReply = pSyncNode->FpOnRequestVoteReply;
+  // gSyncIO->FpOnSyncAppendEntries = pSyncNode->FpOnAppendEntries;
+  // gSyncIO->FpOnSyncAppendEntriesReply = pSyncNode->FpOnAppendEntriesReply;
+  // gSyncIO->FpOnSyncTimeout = pSyncNode->FpOnTimeout;
   gSyncIO->pSyncNode = pSyncNode;
 
   return pSyncNode;
diff --git a/source/libs/sync/test/syncReplicateTest.cpp b/source/libs/sync/test/syncReplicateTest.cpp
index 2419ec0974..4a82bba15d 100644
--- a/source/libs/sync/test/syncReplicateTest.cpp
+++ b/source/libs/sync/test/syncReplicateTest.cpp
@@ -120,16 +120,16 @@ int64_t createSyncNode(int32_t replicaNum, int32_t myIndex, int32_t vgId, SWal*
 
   SSyncNode* pSyncNode = (SSyncNode*)syncNodeAcquire(rid);
   assert(pSyncNode != NULL);
-  gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
-  gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
-  gSyncIO->FpOnSyncRequestVote = pSyncNode->FpOnRequestVote;
-  gSyncIO->FpOnSyncRequestVoteReply = pSyncNode->FpOnRequestVoteReply;
-  gSyncIO->FpOnSyncAppendEntries = pSyncNode->FpOnAppendEntries;
-  gSyncIO->FpOnSyncAppendEntriesReply = pSyncNode->FpOnAppendEntriesReply;
-  gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
-  gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
-  gSyncIO->FpOnSyncTimeout = pSyncNode->FpOnTimeout;
-  gSyncIO->FpOnSyncClientRequest = pSyncNode->FpOnClientRequest;
+  // gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
+  // gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
+  // gSyncIO->FpOnSyncRequestVote = pSyncNode->FpOnRequestVote;
+  // gSyncIO->FpOnSyncRequestVoteReply = pSyncNode->FpOnRequestVoteReply;
+  // gSyncIO->FpOnSyncAppendEntries = pSyncNode->FpOnAppendEntries;
+  // gSyncIO->FpOnSyncAppendEntriesReply = pSyncNode->FpOnAppendEntriesReply;
+  // gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
+  // gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
+  // gSyncIO->FpOnSyncTimeout = pSyncNode->FpOnTimeout;
+  // gSyncIO->FpOnSyncClientRequest = pSyncNode->FpOnClientRequest;
   gSyncIO->pSyncNode = pSyncNode;
   syncNodeRelease(pSyncNode);
 
diff --git a/source/libs/sync/test/syncSnapshotTest.cpp b/source/libs/sync/test/syncSnapshotTest.cpp
index 40eac0b55f..15854eeca6 100644
--- a/source/libs/sync/test/syncSnapshotTest.cpp
+++ b/source/libs/sync/test/syncSnapshotTest.cpp
@@ -116,14 +116,14 @@ SSyncNode *syncNodeInit() {
   SSyncNode *pSyncNode = syncNodeOpen(&syncInfo);
   assert(pSyncNode != NULL);
 
-  gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
-  gSyncIO->FpOnSyncClientRequest = pSyncNode->FpOnClientRequest;
-  gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
-  gSyncIO->FpOnSyncRequestVote = pSyncNode->FpOnRequestVote;
-  gSyncIO->FpOnSyncRequestVoteReply = pSyncNode->FpOnRequestVoteReply;
-  gSyncIO->FpOnSyncAppendEntries = pSyncNode->FpOnAppendEntries;
-  gSyncIO->FpOnSyncAppendEntriesReply = pSyncNode->FpOnAppendEntriesReply;
-  gSyncIO->FpOnSyncTimeout = pSyncNode->FpOnTimeout;
+  // gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
+  // gSyncIO->FpOnSyncClientRequest = pSyncNode->FpOnClientRequest;
+  // gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
+  // gSyncIO->FpOnSyncRequestVote = pSyncNode->FpOnRequestVote;
+  // gSyncIO->FpOnSyncRequestVoteReply = pSyncNode->FpOnRequestVoteReply;
+  // gSyncIO->FpOnSyncAppendEntries = pSyncNode->FpOnAppendEntries;
+  // gSyncIO->FpOnSyncAppendEntriesReply = pSyncNode->FpOnAppendEntriesReply;
+  // gSyncIO->FpOnSyncTimeout = pSyncNode->FpOnTimeout;
   gSyncIO->pSyncNode = pSyncNode;
 
   syncNodeStart(pSyncNode);
diff --git a/source/libs/sync/test/syncTestTool.cpp b/source/libs/sync/test/syncTestTool.cpp
index e8d40d5054..8c486df118 100644
--- a/source/libs/sync/test/syncTestTool.cpp
+++ b/source/libs/sync/test/syncTestTool.cpp
@@ -257,16 +257,16 @@ int64_t createSyncNode(int32_t replicaNum, int32_t myIndex, int32_t vgId, SWal*
 
   SSyncNode* pSyncNode = (SSyncNode*)syncNodeAcquire(rid);
   assert(pSyncNode != NULL);
-  gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
-  gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
-  gSyncIO->FpOnSyncTimeout = pSyncNode->FpOnTimeout;
-  gSyncIO->FpOnSyncClientRequest = pSyncNode->FpOnClientRequest;
-  gSyncIO->FpOnSyncRequestVote = pSyncNode->FpOnRequestVote;
-  gSyncIO->FpOnSyncRequestVoteReply = pSyncNode->FpOnRequestVoteReply;
-  gSyncIO->FpOnSyncAppendEntries = pSyncNode->FpOnAppendEntries;
-  gSyncIO->FpOnSyncAppendEntriesReply = pSyncNode->FpOnAppendEntriesReply;
-  gSyncIO->FpOnSyncSnapshot = pSyncNode->FpOnSnapshot;
-  gSyncIO->FpOnSyncSnapshotReply = pSyncNode->FpOnSnapshotReply;
+  // gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
+  // gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
+  // gSyncIO->FpOnSyncTimeout = pSyncNode->FpOnTimeout;
+  // gSyncIO->FpOnSyncClientRequest = pSyncNode->FpOnClientRequest;
+  // gSyncIO->FpOnSyncRequestVote = pSyncNode->FpOnRequestVote;
+  // gSyncIO->FpOnSyncRequestVoteReply = pSyncNode->FpOnRequestVoteReply;
+  // gSyncIO->FpOnSyncAppendEntries = pSyncNode->FpOnAppendEntries;
+  // gSyncIO->FpOnSyncAppendEntriesReply = pSyncNode->FpOnAppendEntriesReply;
+  // gSyncIO->FpOnSyncSnapshot = pSyncNode->FpOnSnapshot;
+  // gSyncIO->FpOnSyncSnapshotReply = pSyncNode->FpOnSnapshotReply;
 
   gSyncIO->pSyncNode = pSyncNode;
   syncNodeRelease(pSyncNode);
diff --git a/source/libs/sync/test/syncVotesGrantedTest.cpp b/source/libs/sync/test/syncVotesGrantedTest.cpp
index 2d2a12c656..67573a6a37 100644
--- a/source/libs/sync/test/syncVotesGrantedTest.cpp
+++ b/source/libs/sync/test/syncVotesGrantedTest.cpp
@@ -39,14 +39,14 @@ SSyncNode* syncNodeInit() {
   pSyncNode = syncNodeOpen(&syncInfo);
   assert(pSyncNode != NULL);
 
-  gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
-  gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
-  gSyncIO->FpOnSyncRequestVote = pSyncNode->FpOnRequestVote;
-  gSyncIO->FpOnSyncRequestVoteReply = pSyncNode->FpOnRequestVoteReply;
-  gSyncIO->FpOnSyncAppendEntries = pSyncNode->FpOnAppendEntries;
-  gSyncIO->FpOnSyncAppendEntriesReply = pSyncNode->FpOnAppendEntriesReply;
-  gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
-  gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
+  // gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
+  // gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
+  // gSyncIO->FpOnSyncRequestVote = pSyncNode->FpOnRequestVote;
+  // gSyncIO->FpOnSyncRequestVoteReply = pSyncNode->FpOnRequestVoteReply;
+  // gSyncIO->FpOnSyncAppendEntries = pSyncNode->FpOnAppendEntries;
+  // gSyncIO->FpOnSyncAppendEntriesReply = pSyncNode->FpOnAppendEntriesReply;
+  // gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
+  // gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
   gSyncIO->pSyncNode = pSyncNode;
 
   return pSyncNode;
diff --git a/source/libs/sync/test/syncVotesRespondTest.cpp b/source/libs/sync/test/syncVotesRespondTest.cpp
index 712e97edc9..3a0dac98b0 100644
--- a/source/libs/sync/test/syncVotesRespondTest.cpp
+++ b/source/libs/sync/test/syncVotesRespondTest.cpp
@@ -40,14 +40,14 @@ SSyncNode* syncNodeInit() {
   pSyncNode = syncNodeOpen(&syncInfo);
   assert(pSyncNode != NULL);
 
-  gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
-  gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
-  gSyncIO->FpOnSyncRequestVote = pSyncNode->FpOnRequestVote;
-  gSyncIO->FpOnSyncRequestVoteReply = pSyncNode->FpOnRequestVoteReply;
-  gSyncIO->FpOnSyncAppendEntries = pSyncNode->FpOnAppendEntries;
-  gSyncIO->FpOnSyncAppendEntriesReply = pSyncNode->FpOnAppendEntriesReply;
-  gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
-  gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
+  // gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
+  // gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
+  // gSyncIO->FpOnSyncRequestVote = pSyncNode->FpOnRequestVote;
+  // gSyncIO->FpOnSyncRequestVoteReply = pSyncNode->FpOnRequestVoteReply;
+  // gSyncIO->FpOnSyncAppendEntries = pSyncNode->FpOnAppendEntries;
+  // gSyncIO->FpOnSyncAppendEntriesReply = pSyncNode->FpOnAppendEntriesReply;
+  // gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
+  // gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
   gSyncIO->pSyncNode = pSyncNode;
 
   return pSyncNode;
diff --git a/source/libs/sync/test/syncWriteTest.cpp b/source/libs/sync/test/syncWriteTest.cpp
index 56dd0a5845..aae1862681 100644
--- a/source/libs/sync/test/syncWriteTest.cpp
+++ b/source/libs/sync/test/syncWriteTest.cpp
@@ -94,14 +94,14 @@ SSyncNode *syncNodeInit() {
   SSyncNode *pSyncNode = syncNodeOpen(&syncInfo);
   assert(pSyncNode != NULL);
 
-  gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
-  gSyncIO->FpOnSyncClientRequest = pSyncNode->FpOnClientRequest;
-  gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
-  gSyncIO->FpOnSyncRequestVote = pSyncNode->FpOnRequestVote;
-  gSyncIO->FpOnSyncRequestVoteReply = pSyncNode->FpOnRequestVoteReply;
-  gSyncIO->FpOnSyncAppendEntries = pSyncNode->FpOnAppendEntries;
-  gSyncIO->FpOnSyncAppendEntriesReply = pSyncNode->FpOnAppendEntriesReply;
-  gSyncIO->FpOnSyncTimeout = pSyncNode->FpOnTimeout;
+  // gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
+  // gSyncIO->FpOnSyncClientRequest = pSyncNode->FpOnClientRequest;
+  // gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
+  // gSyncIO->FpOnSyncRequestVote = pSyncNode->FpOnRequestVote;
+  // gSyncIO->FpOnSyncRequestVoteReply = pSyncNode->FpOnRequestVoteReply;
+  // gSyncIO->FpOnSyncAppendEntries = pSyncNode->FpOnAppendEntries;
+  // gSyncIO->FpOnSyncAppendEntriesReply = pSyncNode->FpOnAppendEntriesReply;
+  // gSyncIO->FpOnSyncTimeout = pSyncNode->FpOnTimeout;
   gSyncIO->pSyncNode = pSyncNode;
 
   syncNodeStart(pSyncNode);
diff --git a/source/libs/sync/test/sync_test_lib/inc/syncIO.h b/source/libs/sync/test/sync_test_lib/inc/syncIO.h
index 955a832b68..2c5e19d863 100644
--- a/source/libs/sync/test/sync_test_lib/inc/syncIO.h
+++ b/source/libs/sync/test/sync_test_lib/inc/syncIO.h
@@ -25,6 +25,7 @@ extern "C" {
 #include <stdlib.h>
 #include "os.h"
 #include "syncInt.h"
+#include "syncTest.h"
 #include "taosdef.h"
 #include "tqueue.h"
 #include "trpc.h"
@@ -32,6 +33,9 @@ extern "C" {
 #define TICK_Q_TIMER_MS    1000
 #define TICK_Ping_TIMER_MS 1000
 
+typedef struct SyncPing      SyncPing;
+typedef struct SyncPingReply SyncPingReply;
+
 typedef struct SSyncIO {
   STaosQueue *pMsgQ;
   STaosQset  *pQset;
diff --git a/source/libs/sync/test/sync_test_lib/inc/syncTest.h b/source/libs/sync/test/sync_test_lib/inc/syncTest.h
index 93da2df5a2..f531304178 100644
--- a/source/libs/sync/test/sync_test_lib/inc/syncTest.h
+++ b/source/libs/sync/test/sync_test_lib/inc/syncTest.h
@@ -42,6 +42,20 @@ extern "C" {
 
 extern void addEpIntoEpSet(SEpSet* pEpSet, const char* fqdn, uint16_t port);
 
+typedef struct SyncPing      SyncPing;
+typedef struct SyncPingReply SyncPingReply;
+
+typedef int32_t (*FpOnPingCb)(SSyncNode* ths, SyncPing* pMsg);
+typedef int32_t (*FpOnPingReplyCb)(SSyncNode* ths, SyncPingReply* pMsg);
+typedef int32_t (*FpOnClientRequestCb)(SSyncNode* ths, SRpcMsg* pMsg, SyncIndex* pRetIndex);
+typedef int32_t (*FpOnRequestVoteCb)(SSyncNode* ths, SyncRequestVote* pMsg);
+typedef int32_t (*FpOnRequestVoteReplyCb)(SSyncNode* ths, SyncRequestVoteReply* pMsg);
+typedef int32_t (*FpOnAppendEntriesCb)(SSyncNode* ths, SyncAppendEntries* pMsg);
+typedef int32_t (*FpOnAppendEntriesReplyCb)(SSyncNode* ths, SyncAppendEntriesReply* pMsg);
+typedef int32_t (*FpOnTimeoutCb)(SSyncNode* pSyncNode, SyncTimeout* pMsg);
+typedef int32_t (*FpOnSnapshotCb)(SSyncNode* ths, SyncSnapshotSend* pMsg);
+typedef int32_t (*FpOnSnapshotReplyCb)(SSyncNode* ths, SyncSnapshotRsp* pMsg);
+
 cJSON* syncEntry2Json(const SSyncRaftEntry* pEntry);
 char*  syncEntry2Str(const SSyncRaftEntry* pEntry);
 void   syncEntryPrint(const SSyncRaftEntry* pObj);
@@ -127,6 +141,18 @@ void   syncRpcMsgLog2(char* s, SRpcMsg* pMsg);
 
 
 // origin syncMessage
+typedef struct SyncPing {
+  uint32_t bytes;
+  int32_t  vgId;
+  uint32_t msgType;
+  SRaftId  srcId;
+  SRaftId  destId;
+  // private data
+  uint32_t dataLen;
+  char     data[];
+} SyncPing;
+
+
 SyncPing* syncPingBuild(uint32_t dataLen);
 SyncPing* syncPingBuild2(const SRaftId* srcId, const SRaftId* destId, int32_t vgId, const char* str);
 SyncPing* syncPingBuild3(const SRaftId* srcId, const SRaftId* destId, int32_t vgId);
@@ -141,6 +167,51 @@ void      syncPingPrint(const SyncPing* pMsg);
 void      syncPingPrint2(char* s, const SyncPing* pMsg);
 void      syncPingLog(const SyncPing* pMsg);
 void      syncPingLog2(char* s, const SyncPing* pMsg);
+void      syncPingDestroy(SyncPing* pMsg);
+void      syncPingSerialize(const SyncPing* pMsg, char* buf, uint32_t bufLen);
+void      syncPingDeserialize(const char* buf, uint32_t len, SyncPing* pMsg);
+SyncPing* syncPingDeserialize2(const char* buf, uint32_t len);
+SyncPing* syncPingFromRpcMsg2(const SRpcMsg* pRpcMsg);
+
+typedef struct SyncPingReply {
+  uint32_t bytes;
+  int32_t  vgId;
+  uint32_t msgType;
+  SRaftId  srcId;
+  SRaftId  destId;
+  // private data
+  uint32_t dataLen;
+  char     data[];
+} SyncPingReply;
+
+SyncPingReply* syncPingReplyBuild(uint32_t dataLen);
+SyncPingReply* syncPingReplyBuild2(const SRaftId* srcId, const SRaftId* destId, int32_t vgId, const char* str);
+SyncPingReply* syncPingReplyBuild3(const SRaftId* srcId, const SRaftId* destId, int32_t vgId);
+void           syncPingReplyDestroy(SyncPingReply* pMsg);
+void           syncPingReplySerialize(const SyncPingReply* pMsg, char* buf, uint32_t bufLen);
+void           syncPingReplyDeserialize(const char* buf, uint32_t len, SyncPingReply* pMsg);
+char*          syncPingReplySerialize2(const SyncPingReply* pMsg, uint32_t* len);
+SyncPingReply* syncPingReplyDeserialize2(const char* buf, uint32_t len);
+int32_t        syncPingReplySerialize3(const SyncPingReply* pMsg, char* buf, int32_t bufLen);
+SyncPingReply* syncPingReplyDeserialize3(void* buf, int32_t bufLen);
+void           syncPingReply2RpcMsg(const SyncPingReply* pMsg, SRpcMsg* pRpcMsg);
+void           syncPingReplyFromRpcMsg(const SRpcMsg* pRpcMsg, SyncPingReply* pMsg);
+SyncPingReply* syncPingReplyFromRpcMsg2(const SRpcMsg* pRpcMsg);
+cJSON*         syncPingReply2Json(const SyncPingReply* pMsg);
+char*          syncPingReply2Str(const SyncPingReply* pMsg);
+
+// for debug ----------------------
+void syncPingReplyPrint(const SyncPingReply* pMsg);
+void syncPingReplyPrint2(char* s, const SyncPingReply* pMsg);
+void syncPingReplyLog(const SyncPingReply* pMsg);
+void syncPingReplyLog2(char* s, const SyncPingReply* pMsg);
+
+int32_t syncNodeOnPing(SSyncNode* ths, SyncPing* pMsg);
+int32_t syncNodeOnPingReply(SSyncNode* ths, SyncPingReply* pMsg);
+int32_t syncNodePing(SSyncNode* pSyncNode, const SRaftId* destRaftId, SyncPing* pMsg);
+int32_t syncNodePingSelf(SSyncNode* pSyncNode);
+int32_t syncNodePingPeers(SSyncNode* pSyncNode);
+int32_t syncNodePingAll(SSyncNode* pSyncNode);
 
 #ifdef __cplusplus
 }
diff --git a/source/libs/sync/test/sync_test_lib/src/syncMainDebug.c b/source/libs/sync/test/sync_test_lib/src/syncMainDebug.c
index 5e1a9be164..6b461da0e5 100644
--- a/source/libs/sync/test/sync_test_lib/src/syncMainDebug.c
+++ b/source/libs/sync/test/sync_test_lib/src/syncMainDebug.c
@@ -138,20 +138,20 @@ cJSON* syncNode2Json(const SSyncNode* pSyncNode) {
     cJSON_AddStringToObject(pRoot, "heartbeatTimerCounter", u64buf);
 
     // callback
-    snprintf(u64buf, sizeof(u64buf), "%p", pSyncNode->FpOnPing);
-    cJSON_AddStringToObject(pRoot, "FpOnPing", u64buf);
-    snprintf(u64buf, sizeof(u64buf), "%p", pSyncNode->FpOnPingReply);
-    cJSON_AddStringToObject(pRoot, "FpOnPingReply", u64buf);
-    snprintf(u64buf, sizeof(u64buf), "%p", pSyncNode->FpOnRequestVote);
-    cJSON_AddStringToObject(pRoot, "FpOnRequestVote", u64buf);
-    snprintf(u64buf, sizeof(u64buf), "%p", pSyncNode->FpOnRequestVoteReply);
-    cJSON_AddStringToObject(pRoot, "FpOnRequestVoteReply", u64buf);
-    snprintf(u64buf, sizeof(u64buf), "%p", pSyncNode->FpOnAppendEntries);
-    cJSON_AddStringToObject(pRoot, "FpOnAppendEntries", u64buf);
-    snprintf(u64buf, sizeof(u64buf), "%p", pSyncNode->FpOnAppendEntriesReply);
-    cJSON_AddStringToObject(pRoot, "FpOnAppendEntriesReply", u64buf);
-    snprintf(u64buf, sizeof(u64buf), "%p", pSyncNode->FpOnTimeout);
-    cJSON_AddStringToObject(pRoot, "FpOnTimeout", u64buf);
+    // snprintf(u64buf, sizeof(u64buf), "%p", pSyncNode->FpOnPing);
+    // cJSON_AddStringToObject(pRoot, "FpOnPing", u64buf);
+    // snprintf(u64buf, sizeof(u64buf), "%p", pSyncNode->FpOnPingReply);
+    // cJSON_AddStringToObject(pRoot, "FpOnPingReply", u64buf);
+    // snprintf(u64buf, sizeof(u64buf), "%p", pSyncNode->FpOnRequestVote);
+    // cJSON_AddStringToObject(pRoot, "FpOnRequestVote", u64buf);
+    // snprintf(u64buf, sizeof(u64buf), "%p", pSyncNode->FpOnRequestVoteReply);
+    // cJSON_AddStringToObject(pRoot, "FpOnRequestVoteReply", u64buf);
+    // snprintf(u64buf, sizeof(u64buf), "%p", pSyncNode->FpOnAppendEntries);
+    // cJSON_AddStringToObject(pRoot, "FpOnAppendEntries", u64buf);
+    // snprintf(u64buf, sizeof(u64buf), "%p", pSyncNode->FpOnAppendEntriesReply);
+    // cJSON_AddStringToObject(pRoot, "FpOnAppendEntriesReply", u64buf);
+    // snprintf(u64buf, sizeof(u64buf), "%p", pSyncNode->FpOnTimeout);
+    // cJSON_AddStringToObject(pRoot, "FpOnTimeout", u64buf);
 
     // restoreFinish
     cJSON_AddNumberToObject(pRoot, "restoreFinish", pSyncNode->restoreFinish);
@@ -253,3 +253,29 @@ int32_t syncNodePingAll(SSyncNode* pSyncNode) {
   return ret;
 }
 
+// on message ----
+int32_t syncNodeOnPing(SSyncNode* ths, SyncPing* pMsg) {
+  sTrace("vgId:%d, recv sync-ping", ths->vgId);
+
+  SyncPingReply* pMsgReply = syncPingReplyBuild3(&ths->myRaftId, &pMsg->srcId, ths->vgId);
+  SRpcMsg        rpcMsg;
+  syncPingReply2RpcMsg(pMsgReply, &rpcMsg);
+
+  /*
+    // htonl
+    SMsgHead* pHead = rpcMsg.pCont;
+    pHead->contLen = htonl(pHead->contLen);
+    pHead->vgId = htonl(pHead->vgId);
+  */
+
+  syncNodeSendMsgById(&pMsgReply->destId, ths, &rpcMsg);
+  syncPingReplyDestroy(pMsgReply);
+
+  return 0;
+}
+
+int32_t syncNodeOnPingReply(SSyncNode* ths, SyncPingReply* pMsg) {
+  int32_t ret = 0;
+  sTrace("vgId:%d, recv sync-ping-reply", ths->vgId);
+  return ret;
+}
diff --git a/source/libs/sync/test/sync_test_lib/src/syncMessageDebug.c b/source/libs/sync/test/sync_test_lib/src/syncMessageDebug.c
index cdd2ae045d..c56d983e6e 100644
--- a/source/libs/sync/test/sync_test_lib/src/syncMessageDebug.c
+++ b/source/libs/sync/test/sync_test_lib/src/syncMessageDebug.c
@@ -254,6 +254,308 @@ void syncPingLog2(char* s, const SyncPing* pMsg) {
   }
 }
 
+void syncPingDestroy(SyncPing* pMsg) {
+  if (pMsg != NULL) {
+    taosMemoryFree(pMsg);
+  }
+}
+
+void syncPingSerialize(const SyncPing* pMsg, char* buf, uint32_t bufLen) {
+  ASSERT(pMsg->bytes <= bufLen);
+  memcpy(buf, pMsg, pMsg->bytes);
+}
+
+void syncPingDeserialize(const char* buf, uint32_t len, SyncPing* pMsg) {
+  memcpy(pMsg, buf, len);
+  ASSERT(len == pMsg->bytes);
+  ASSERT(pMsg->bytes == sizeof(SyncPing) + pMsg->dataLen);
+}
+
+SyncPing* syncPingDeserialize2(const char* buf, uint32_t len) {
+  uint32_t  bytes = *((uint32_t*)buf);
+  SyncPing* pMsg = taosMemoryMalloc(bytes);
+  ASSERT(pMsg != NULL);
+  syncPingDeserialize(buf, len, pMsg);
+  ASSERT(len == pMsg->bytes);
+  return pMsg;
+}
+
+SyncPing* syncPingFromRpcMsg2(const SRpcMsg* pRpcMsg) {
+  SyncPing* pMsg = syncPingDeserialize2(pRpcMsg->pCont, pRpcMsg->contLen);
+  ASSERT(pMsg != NULL);
+  return pMsg;
+}
+
+// ---- message process SyncPingReply----
+SyncPingReply* syncPingReplyBuild(uint32_t dataLen) {
+  uint32_t       bytes = sizeof(SyncPingReply) + dataLen;
+  SyncPingReply* pMsg = taosMemoryMalloc(bytes);
+  memset(pMsg, 0, bytes);
+  pMsg->bytes = bytes;
+  pMsg->msgType = TDMT_SYNC_PING_REPLY;
+  pMsg->dataLen = dataLen;
+  return pMsg;
+}
+
+SyncPingReply* syncPingReplyBuild2(const SRaftId* srcId, const SRaftId* destId, int32_t vgId, const char* str) {
+  uint32_t       dataLen = strlen(str) + 1;
+  SyncPingReply* pMsg = syncPingReplyBuild(dataLen);
+  pMsg->vgId = vgId;
+  pMsg->srcId = *srcId;
+  pMsg->destId = *destId;
+  snprintf(pMsg->data, pMsg->dataLen, "%s", str);
+  return pMsg;
+}
+
+SyncPingReply* syncPingReplyBuild3(const SRaftId* srcId, const SRaftId* destId, int32_t vgId) {
+  SyncPingReply* pMsg = syncPingReplyBuild2(srcId, destId, vgId, "pang");
+  return pMsg;
+}
+
+void syncPingReplyDestroy(SyncPingReply* pMsg) {
+  if (pMsg != NULL) {
+    taosMemoryFree(pMsg);
+  }
+}
+
+void syncPingReplySerialize(const SyncPingReply* pMsg, char* buf, uint32_t bufLen) {
+  ASSERT(pMsg->bytes <= bufLen);
+  memcpy(buf, pMsg, pMsg->bytes);
+}
+
+void syncPingReplyDeserialize(const char* buf, uint32_t len, SyncPingReply* pMsg) {
+  memcpy(pMsg, buf, len);
+  ASSERT(len == pMsg->bytes);
+  ASSERT(pMsg->bytes == sizeof(SyncPingReply) + pMsg->dataLen);
+}
+
+char* syncPingReplySerialize2(const SyncPingReply* pMsg, uint32_t* len) {
+  char* buf = taosMemoryMalloc(pMsg->bytes);
+  ASSERT(buf != NULL);
+  syncPingReplySerialize(pMsg, buf, pMsg->bytes);
+  if (len != NULL) {
+    *len = pMsg->bytes;
+  }
+  return buf;
+}
+
+SyncPingReply* syncPingReplyDeserialize2(const char* buf, uint32_t len) {
+  uint32_t       bytes = *((uint32_t*)buf);
+  SyncPingReply* pMsg = taosMemoryMalloc(bytes);
+  ASSERT(pMsg != NULL);
+  syncPingReplyDeserialize(buf, len, pMsg);
+  ASSERT(len == pMsg->bytes);
+  return pMsg;
+}
+
+int32_t syncPingReplySerialize3(const SyncPingReply* pMsg, char* buf, int32_t bufLen) {
+  SEncoder encoder = {0};
+  tEncoderInit(&encoder, buf, bufLen);
+  if (tStartEncode(&encoder) < 0) {
+    return -1;
+  }
+
+  if (tEncodeU32(&encoder, pMsg->bytes) < 0) {
+    return -1;
+  }
+  if (tEncodeI32(&encoder, pMsg->vgId) < 0) {
+    return -1;
+  }
+  if (tEncodeU32(&encoder, pMsg->msgType) < 0) {
+    return -1;
+  }
+  if (tEncodeU64(&encoder, pMsg->srcId.addr) < 0) {
+    return -1;
+  }
+  if (tEncodeI32(&encoder, pMsg->srcId.vgId) < 0) {
+    return -1;
+  }
+  if (tEncodeU64(&encoder, pMsg->destId.addr) < 0) {
+    return -1;
+  }
+  if (tEncodeI32(&encoder, pMsg->destId.vgId) < 0) {
+    return -1;
+  }
+  if (tEncodeU32(&encoder, pMsg->dataLen) < 0) {
+    return -1;
+  }
+  if (tEncodeBinary(&encoder, pMsg->data, pMsg->dataLen)) {
+    return -1;
+  }
+
+  tEndEncode(&encoder);
+  int32_t tlen = encoder.pos;
+  tEncoderClear(&encoder);
+  return tlen;
+}
+
+SyncPingReply* syncPingReplyDeserialize3(void* buf, int32_t bufLen) {
+  SDecoder decoder = {0};
+  tDecoderInit(&decoder, buf, bufLen);
+  if (tStartDecode(&decoder) < 0) {
+    return NULL;
+  }
+
+  SyncPingReply* pMsg = NULL;
+  uint32_t       bytes;
+  if (tDecodeU32(&decoder, &bytes) < 0) {
+    return NULL;
+  }
+
+  pMsg = taosMemoryMalloc(bytes);
+  ASSERT(pMsg != NULL);
+  pMsg->bytes = bytes;
+
+  if (tDecodeI32(&decoder, &pMsg->vgId) < 0) {
+    taosMemoryFree(pMsg);
+    return NULL;
+  }
+  if (tDecodeU32(&decoder, &pMsg->msgType) < 0) {
+    taosMemoryFree(pMsg);
+    return NULL;
+  }
+  if (tDecodeU64(&decoder, &pMsg->srcId.addr) < 0) {
+    taosMemoryFree(pMsg);
+    return NULL;
+  }
+  if (tDecodeI32(&decoder, &pMsg->srcId.vgId) < 0) {
+    taosMemoryFree(pMsg);
+    return NULL;
+  }
+  if (tDecodeU64(&decoder, &pMsg->destId.addr) < 0) {
+    taosMemoryFree(pMsg);
+    return NULL;
+  }
+  if (tDecodeI32(&decoder, &pMsg->destId.vgId) < 0) {
+    taosMemoryFree(pMsg);
+    return NULL;
+  }
+  if (tDecodeU32(&decoder, &pMsg->dataLen) < 0) {
+    taosMemoryFree(pMsg);
+    return NULL;
+  }
+  uint32_t len;
+  char*    data = NULL;
+  if (tDecodeBinary(&decoder, (uint8_t**)(&data), &len) < 0) {
+    taosMemoryFree(pMsg);
+    return NULL;
+  }
+  ASSERT(len == pMsg->dataLen);
+  memcpy(pMsg->data, data, len);
+
+  tEndDecode(&decoder);
+  tDecoderClear(&decoder);
+  return pMsg;
+}
+
+void syncPingReply2RpcMsg(const SyncPingReply* pMsg, SRpcMsg* pRpcMsg) {
+  memset(pRpcMsg, 0, sizeof(*pRpcMsg));
+  pRpcMsg->msgType = pMsg->msgType;
+  pRpcMsg->contLen = pMsg->bytes;
+  pRpcMsg->pCont = rpcMallocCont(pRpcMsg->contLen);
+  syncPingReplySerialize(pMsg, pRpcMsg->pCont, pRpcMsg->contLen);
+}
+
+void syncPingReplyFromRpcMsg(const SRpcMsg* pRpcMsg, SyncPingReply* pMsg) {
+  syncPingReplyDeserialize(pRpcMsg->pCont, pRpcMsg->contLen, pMsg);
+}
+
+SyncPingReply* syncPingReplyFromRpcMsg2(const SRpcMsg* pRpcMsg) {
+  SyncPingReply* pMsg = syncPingReplyDeserialize2(pRpcMsg->pCont, pRpcMsg->contLen);
+  ASSERT(pMsg != NULL);
+  return pMsg;
+}
+
+cJSON* syncPingReply2Json(const SyncPingReply* pMsg) {
+  char   u64buf[128] = {0};
+  cJSON* pRoot = cJSON_CreateObject();
+
+  if (pMsg != NULL) {
+    cJSON_AddNumberToObject(pRoot, "bytes", pMsg->bytes);
+    cJSON_AddNumberToObject(pRoot, "vgId", pMsg->vgId);
+    cJSON_AddNumberToObject(pRoot, "msgType", pMsg->msgType);
+
+    cJSON* pSrcId = cJSON_CreateObject();
+    snprintf(u64buf, sizeof(u64buf), "%" PRIu64, pMsg->srcId.addr);
+    cJSON_AddStringToObject(pSrcId, "addr", u64buf);
+    {
+      uint64_t u64 = pMsg->srcId.addr;
+      cJSON*   pTmp = pSrcId;
+      char     host[128] = {0};
+      uint16_t port;
+      syncUtilU642Addr(u64, host, sizeof(host), &port);
+      cJSON_AddStringToObject(pTmp, "addr_host", host);
+      cJSON_AddNumberToObject(pTmp, "addr_port", port);
+    }
+    cJSON_AddNumberToObject(pSrcId, "vgId", pMsg->srcId.vgId);
+    cJSON_AddItemToObject(pRoot, "srcId", pSrcId);
+
+    cJSON* pDestId = cJSON_CreateObject();
+    snprintf(u64buf, sizeof(u64buf), "%" PRIu64, pMsg->destId.addr);
+    cJSON_AddStringToObject(pDestId, "addr", u64buf);
+    {
+      uint64_t u64 = pMsg->destId.addr;
+      cJSON*   pTmp = pDestId;
+      char     host[128] = {0};
+      uint16_t port;
+      syncUtilU642Addr(u64, host, sizeof(host), &port);
+      cJSON_AddStringToObject(pTmp, "addr_host", host);
+      cJSON_AddNumberToObject(pTmp, "addr_port", port);
+    }
+    cJSON_AddNumberToObject(pDestId, "vgId", pMsg->destId.vgId);
+    cJSON_AddItemToObject(pRoot, "destId", pDestId);
+
+    cJSON_AddNumberToObject(pRoot, "dataLen", pMsg->dataLen);
+    char* s;
+    s = syncUtilPrintBin((char*)(pMsg->data), pMsg->dataLen);
+    cJSON_AddStringToObject(pRoot, "data", s);
+    taosMemoryFree(s);
+    s = syncUtilPrintBin2((char*)(pMsg->data), pMsg->dataLen);
+    cJSON_AddStringToObject(pRoot, "data2", s);
+    taosMemoryFree(s);
+  }
+
+  cJSON* pJson = cJSON_CreateObject();
+  cJSON_AddItemToObject(pJson, "SyncPingReply", pRoot);
+  return pJson;
+}
+
+char* syncPingReply2Str(const SyncPingReply* pMsg) {
+  cJSON* pJson = syncPingReply2Json(pMsg);
+  char*  serialized = cJSON_Print(pJson);
+  cJSON_Delete(pJson);
+  return serialized;
+}
+
+// for debug ----------------------
+void syncPingReplyPrint(const SyncPingReply* pMsg) {
+  char* serialized = syncPingReply2Str(pMsg);
+  printf("syncPingReplyPrint | len:%zu | %s \n", strlen(serialized), serialized);
+  fflush(NULL);
+  taosMemoryFree(serialized);
+}
+
+void syncPingReplyPrint2(char* s, const SyncPingReply* pMsg) {
+  char* serialized = syncPingReply2Str(pMsg);
+  printf("syncPingReplyPrint2 | len:%zu | %s | %s \n", strlen(serialized), s, serialized);
+  fflush(NULL);
+  taosMemoryFree(serialized);
+}
+
+void syncPingReplyLog(const SyncPingReply* pMsg) {
+  char* serialized = syncPingReply2Str(pMsg);
+  sTrace("syncPingReplyLog | len:%zu | %s", strlen(serialized), serialized);
+  taosMemoryFree(serialized);
+}
+
+void syncPingReplyLog2(char* s, const SyncPingReply* pMsg) {
+  if (gRaftDetailLog) {
+    char* serialized = syncPingReply2Str(pMsg);
+    sTrace("syncPingReplyLog2 | len:%zu | %s | %s", strlen(serialized), s, serialized);
+    taosMemoryFree(serialized);
+  }
+}
+
 // ---------------------------------------------
 cJSON* syncRpcMsg2Json(SRpcMsg* pRpcMsg) {
   cJSON* pRoot;