Merge pull request #13807 from taosdata/feature/3.0_mhli

refactor(sync): update replica index in snapshot sender

include/libs/sync/sync.h

@@ -47,8 +47,9 @@ typedef enum {
 typedef enum {
   TAOS_SYNC_PROPOSE_SUCCESS = 0,
   TAOS_SYNC_PROPOSE_NOT_LEADER = 1,
-  TAOS_SYNC_PROPOSE_OTHER_ERROR = 2,
-  TAOS_SYNC_ONLY_ONE_REPLICA = 3,
+  TAOS_SYNC_ONLY_ONE_REPLICA = 2,
+  TAOS_SYNC_NOT_IN_NEW_CONFIG = 3,
+  TAOS_SYNC_OTHER_ERROR = 100,
 } ESyncProposeCode;
 
 typedef enum {
@@ -110,6 +111,7 @@ typedef struct SSyncFSM {
 
   void (*FpRestoreFinishCb)(struct SSyncFSM* pFsm);
   void (*FpReConfigCb)(struct SSyncFSM* pFsm, const SRpcMsg* pMsg, SReConfigCbMeta cbMeta);
+  void (*FpLeaderTransferCb)(struct SSyncFSM* pFsm, const SRpcMsg* pMsg, SFsmCbMeta cbMeta);
 
   int32_t (*FpGetSnapshot)(struct SSyncFSM* pFsm, SSnapshot* pSnapshot);
 
@@ -199,15 +201,13 @@ bool        syncIsRestoreFinish(int64_t rid);
 int32_t     syncGetSnapshotMeta(int64_t rid, struct SSnapshotMeta* sMeta);
 
 int32_t syncReconfig(int64_t rid, const SSyncCfg* pNewCfg);
-int32_t syncReconfigRaw(int64_t rid, const SSyncCfg* pNewCfg, SRpcMsg* pRpcMsg);
+
+// build SRpcMsg, need to call syncPropose with SRpcMsg
+int32_t syncReconfigBuild(int64_t rid, const SSyncCfg* pNewCfg, SRpcMsg* pRpcMsg);
 
 int32_t syncLeaderTransfer(int64_t rid);
 int32_t syncLeaderTransferTo(int64_t rid, SNodeInfo newLeader);
 
-// to be moved to static
-void syncStartNormal(int64_t rid);
-void syncStartStandBy(int64_t rid);
-
 #ifdef __cplusplus
 }
 #endif

include/libs/sync/syncTools.h

@@ -467,6 +467,7 @@ typedef struct SyncLeaderTransfer {
    SRaftId  srcId;
    SRaftId  destId;
    */
+  SNodeInfo newNodeInfo;
   SRaftId newLeaderId;
 } SyncLeaderTransfer;
 

source/dnode/mnode/impl/src/mndMain.c

@@ -380,22 +380,22 @@ void mndStop(SMnode *pMnode) {
 int32_t mndProcessSyncMsg(SRpcMsg *pMsg) {
   SMnode    *pMnode = pMsg->info.node;
   SSyncMgmt *pMgmt = &pMnode->syncMgmt;
-  int32_t    code = TAOS_SYNC_PROPOSE_OTHER_ERROR;
+  int32_t    code = TAOS_SYNC_OTHER_ERROR;
 
   if (!syncEnvIsStart()) {
     mError("failed to process sync msg:%p type:%s since syncEnv stop", pMsg, TMSG_INFO(pMsg->msgType));
-    return TAOS_SYNC_PROPOSE_OTHER_ERROR;
+    return TAOS_SYNC_OTHER_ERROR;
   }
 
   SSyncNode *pSyncNode = syncNodeAcquire(pMgmt->sync);
   if (pSyncNode == NULL) {
     mError("failed to process sync msg:%p type:%s since syncNode is null", pMsg, TMSG_INFO(pMsg->msgType));
-    return TAOS_SYNC_PROPOSE_OTHER_ERROR;
+    return TAOS_SYNC_OTHER_ERROR;
   }
 
   if (mndAcquireSyncRef(pMnode) != 0) {
     mError("failed to process sync msg:%p type:%s since %s", pMsg, TMSG_INFO(pMsg->msgType), terrstr());
-    return TAOS_SYNC_PROPOSE_OTHER_ERROR;
+    return TAOS_SYNC_OTHER_ERROR;
   }
 
   char  logBuf[512] = {0};
@@ -456,7 +456,7 @@ int32_t mndProcessSyncMsg(SRpcMsg *pMsg) {
       tmsgSendRsp(&rsp);
     } else {
       mError("failed to process msg:%p since invalid type:%s", pMsg, TMSG_INFO(pMsg->msgType));
-      code = TAOS_SYNC_PROPOSE_OTHER_ERROR;
+      code = TAOS_SYNC_OTHER_ERROR;
     }
   } else {
     if (pMsg->msgType == TDMT_SYNC_TIMEOUT) {
@@ -497,7 +497,7 @@ int32_t mndProcessSyncMsg(SRpcMsg *pMsg) {
       tmsgSendRsp(&rsp);
     } else {
       mError("failed to process msg:%p since invalid type:%s", pMsg, TMSG_INFO(pMsg->msgType));
-      code = TAOS_SYNC_PROPOSE_OTHER_ERROR;
+      code = TAOS_SYNC_OTHER_ERROR;
     }
   }
 

source/dnode/mnode/impl/src/mndSync.c

@@ -236,7 +236,7 @@ int32_t mndSyncPropose(SMnode *pMnode, SSdbRaw *pRaw, int32_t transId) {
     tsem_wait(&pMgmt->syncSem);
   } else if (code == TAOS_SYNC_PROPOSE_NOT_LEADER) {
     terrno = TSDB_CODE_APP_NOT_READY;
-  } else if (code == TAOS_SYNC_PROPOSE_OTHER_ERROR) {
+  } else if (code == TAOS_SYNC_OTHER_ERROR) {
     terrno = TSDB_CODE_SYN_INTERNAL_ERROR;
   } else {
     terrno = TSDB_CODE_APP_ERROR;
@@ -254,13 +254,16 @@ int32_t mndSyncPropose(SMnode *pMnode, SSdbRaw *pRaw, int32_t transId) {
 void mndSyncStart(SMnode *pMnode) {
   SSyncMgmt *pMgmt = &pMnode->syncMgmt;
   syncSetMsgCb(pMgmt->sync, &pMnode->msgCb);
+  syncStart(pMgmt->sync);
+  mDebug("mnode sync started, id:%" PRId64 " standby:%d", pMgmt->sync, pMgmt->standby);
 
+/*
   if (pMgmt->standby) {
     syncStartStandBy(pMgmt->sync);
   } else {
     syncStart(pMgmt->sync);
   }
-  mDebug("mnode sync started, id:%" PRId64 " standby:%d", pMgmt->sync, pMgmt->standby);
+*/  
 }
 
 void mndSyncStop(SMnode *pMnode) {}

source/dnode/vnode/src/vnd/vnodeSvr.c

@@ -289,7 +289,7 @@ void vnodeUpdateMetaRsp(SVnode *pVnode, STableMetaRsp *pMetaRsp) {
 }
 
 int32_t vnodeProcessSyncReq(SVnode *pVnode, SRpcMsg *pMsg, SRpcMsg **pRsp) {
-  int32_t ret = TAOS_SYNC_PROPOSE_OTHER_ERROR;
+  int32_t ret = TAOS_SYNC_OTHER_ERROR;
 
   if (syncEnvIsStart()) {
     SSyncNode *pSyncNode = syncNodeAcquire(pVnode->sync);
@@ -370,13 +370,13 @@ int32_t vnodeProcessSyncReq(SVnode *pVnode, SRpcMsg *pMsg, SRpcMsg **pRsp) {
 
     } else {
       vError("==vnodeProcessSyncReq== error msg type:%d", pRpcMsg->msgType);
-      ret = TAOS_SYNC_PROPOSE_OTHER_ERROR;
+      ret = TAOS_SYNC_OTHER_ERROR;
     }
 
     syncNodeRelease(pSyncNode);
   } else {
     vError("==vnodeProcessSyncReq== error syncEnv stop");
-    ret = TAOS_SYNC_PROPOSE_OTHER_ERROR;
+    ret = TAOS_SYNC_OTHER_ERROR;
   }
 
   return ret;

source/dnode/vnode/src/vnd/vnodeSync.c

@@ -283,11 +283,14 @@ int32_t vnodeSyncOpen(SVnode *pVnode, char *path) {
 
 void vnodeSyncStart(SVnode *pVnode) {
   syncSetMsgCb(pVnode->sync, &pVnode->msgCb);
+  syncStart(pVnode->sync);
+  /*
   if (pVnode->config.standby) {
     syncStartStandBy(pVnode->sync);
   } else {
     syncStart(pVnode->sync);
   }
+  */
 }
 
 void vnodeSyncClose(SVnode *pVnode) { syncStop(pVnode->sync); }

source/libs/sync/inc/syncInt.h

@@ -168,6 +168,7 @@ SSyncNode* syncNodeOpen(const SSyncInfo* pSyncInfo);
 void       syncNodeStart(SSyncNode* pSyncNode);
 void       syncNodeStartStandBy(SSyncNode* pSyncNode);
 void       syncNodeClose(SSyncNode* pSyncNode);
+int32_t    syncNodePropose(SSyncNode* pSyncNode, const SRpcMsg* pMsg, bool isWeak);
 
 // option
 bool syncNodeSnapshotEnable(SSyncNode* pSyncNode);
@@ -232,6 +233,9 @@ int32_t syncNodeCommit(SSyncNode* ths, SyncIndex beginIndex, SyncIndex endIndex,
 bool                 syncNodeInRaftGroup(SSyncNode* ths, SRaftId* pRaftId);
 SSyncSnapshotSender* syncNodeGetSnapshotSender(SSyncNode* ths, SRaftId* pDestId);
 
+void syncStartNormal(int64_t rid);
+void syncStartStandBy(int64_t rid);
+
 // for debug --------------
 void syncNodePrint(SSyncNode* pObj);
 void syncNodePrint2(char* s, SSyncNode* pObj);

source/libs/sync/src/syncAppendEntries.c

@@ -995,7 +995,7 @@ int32_t syncNodeOnAppendEntriesSnapshotCb(SSyncNode* ths, SyncAppendEntries* pMs
             ths->commitIndex = snapshot.lastApplyIndex;
 
             sDebug("vgId:%d sync event commit by snapshot from index:%ld to index:%ld, %s", ths->vgId, commitBegin,
-                  commitEnd, syncUtilState2String(ths->state));
+                   commitEnd, syncUtilState2String(ths->state));
           }
 
           SyncIndex beginIndex = ths->commitIndex + 1;

source/libs/sync/src/syncCommit.c

@@ -57,7 +57,7 @@ void syncMaybeAdvanceCommitIndex(SSyncNode* pSyncNode) {
     pSyncNode->commitIndex = snapshot.lastApplyIndex;
 
     sDebug("vgId:%d sync event commit by snapshot from index:%ld to index:%ld, %s", pSyncNode->vgId,
-          pSyncNode->commitIndex, snapshot.lastApplyIndex, syncUtilState2String(pSyncNode->state));
+           pSyncNode->commitIndex, snapshot.lastApplyIndex, syncUtilState2String(pSyncNode->state));
   }
 
   // update commit index

source/libs/sync/src/syncMain.c

@@ -149,12 +149,12 @@ void syncStop(int64_t rid) {
 int32_t syncSetStandby(int64_t rid) {
   SSyncNode* pSyncNode = (SSyncNode*)taosAcquireRef(tsNodeRefId, rid);
   if (pSyncNode == NULL) {
-    return -1;
+    return TAOS_SYNC_OTHER_ERROR;
   }
 
   if (pSyncNode->state == TAOS_SYNC_STATE_LEADER) {
     taosReleaseRef(tsNodeRefId, pSyncNode->rid);
-    return -1;
+    return TAOS_SYNC_OTHER_ERROR;
   }
 
   // state change
@@ -174,14 +174,88 @@ int32_t syncSetStandby(int64_t rid) {
   return 0;
 }
 
-int32_t syncReconfig(int64_t rid, const SSyncCfg* pSyncCfg) {
+int32_t syncReconfigBuild(int64_t rid, const SSyncCfg* pNewCfg, SRpcMsg* pRpcMsg) {
+  SSyncNode* pSyncNode = (SSyncNode*)taosAcquireRef(tsNodeRefId, rid);
+  if (pSyncNode == NULL) {
+    return TAOS_SYNC_OTHER_ERROR;
+  }
+  ASSERT(rid == pSyncNode->rid);
+
   int32_t ret = 0;
-  char*   newconfig = syncCfg2Str((SSyncCfg*)pSyncCfg);
+  bool    IamInNew = false;
+  for (int i = 0; i < pNewCfg->replicaNum; ++i) {
+    if (strcmp((pNewCfg->nodeInfo)[i].nodeFqdn, pSyncNode->myNodeInfo.nodeFqdn) == 0 &&
+        (pNewCfg->nodeInfo)[i].nodePort == pSyncNode->myNodeInfo.nodePort) {
+      IamInNew = true;
+    }
+
+    /*
+        SRaftId newId;
+        newId.addr = syncUtilAddr2U64((pNewCfg->nodeInfo)[i].nodeFqdn, (pNewCfg->nodeInfo)[i].nodePort);
+        newId.vgId = pSyncNode->vgId;
+        if (syncUtilSameId(&(pSyncNode->myRaftId), &newId)) {
+          IamInNew = true;
+        }
+    */
+  }
+
+  if (!IamInNew) {
+    taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+    return TAOS_SYNC_NOT_IN_NEW_CONFIG;
+  }
+
+  char* newconfig = syncCfg2Str((SSyncCfg*)pNewCfg);
+  pRpcMsg->msgType = TDMT_SYNC_CONFIG_CHANGE;
+  pRpcMsg->info.noResp = 1;
+  pRpcMsg->contLen = strlen(newconfig) + 1;
+  pRpcMsg->pCont = rpcMallocCont(pRpcMsg->contLen);
+  snprintf(pRpcMsg->pCont, pRpcMsg->contLen, "%s", newconfig);
+  taosMemoryFree(newconfig);
+
+  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+  return ret;
+}
+
+int32_t syncReconfig(int64_t rid, const SSyncCfg* pNewCfg) {
+  SSyncNode* pSyncNode = (SSyncNode*)taosAcquireRef(tsNodeRefId, rid);
+  if (pSyncNode == NULL) {
+    return TAOS_SYNC_OTHER_ERROR;
+  }
+  ASSERT(rid == pSyncNode->rid);
+
+  bool IamInNew = false;
+  for (int i = 0; i < pNewCfg->replicaNum; ++i) {
+    if (strcmp((pNewCfg->nodeInfo)[i].nodeFqdn, pSyncNode->myNodeInfo.nodeFqdn) == 0 &&
+        (pNewCfg->nodeInfo)[i].nodePort == pSyncNode->myNodeInfo.nodePort) {
+      IamInNew = true;
+    }
+
+    /*
+        // some problem in inet_addr
+
+        SRaftId newId = EMPTY_RAFT_ID;
+        newId.addr = syncUtilAddr2U64((pNewCfg->nodeInfo)[i].nodeFqdn, (pNewCfg->nodeInfo)[i].nodePort);
+        newId.vgId = pSyncNode->vgId;
+
+        if (syncUtilSameId(&(pSyncNode->myRaftId), &newId)) {
+          IamInNew = true;
+        }
+      */
+  }
+
+  if (!IamInNew) {
+    sError("sync reconfig error, not in new config");
+    taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+    return TAOS_SYNC_NOT_IN_NEW_CONFIG;
+  }
 
+  char* newconfig = syncCfg2Str((SSyncCfg*)pNewCfg);
   if (gRaftDetailLog) {
     sInfo("==syncReconfig== newconfig:%s", newconfig);
   }
 
+  int32_t ret = 0;
+
   SRpcMsg rpcMsg = {0};
   rpcMsg.msgType = TDMT_SYNC_CONFIG_CHANGE;
   rpcMsg.info.noResp = 1;
@@ -189,58 +263,59 @@ int32_t syncReconfig(int64_t rid, const SSyncCfg* pSyncCfg) {
   rpcMsg.pCont = rpcMallocCont(rpcMsg.contLen);
   snprintf(rpcMsg.pCont, rpcMsg.contLen, "%s", newconfig);
   taosMemoryFree(newconfig);
-  ret = syncPropose(rid, &rpcMsg, false);
+  ret = syncNodePropose(pSyncNode, &rpcMsg, false);
+
+  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
   return ret;
 }
 
 int32_t syncLeaderTransfer(int64_t rid) {
-  int32_t ret = 0;
+  SSyncNode* pSyncNode = (SSyncNode*)taosAcquireRef(tsNodeRefId, rid);
+  if (pSyncNode == NULL) {
+    return TAOS_SYNC_OTHER_ERROR;
+  }
+  ASSERT(rid == pSyncNode->rid);
+
+  if (pSyncNode->peersNum == 0) {
+    taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+    return TAOS_SYNC_OTHER_ERROR;
+  }
+
+  SNodeInfo newLeader = (pSyncNode->peersNodeInfo)[0];
+  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
 
+  int32_t ret = syncLeaderTransferTo(rid, newLeader);
   return ret;
 }
 
 int32_t syncLeaderTransferTo(int64_t rid, SNodeInfo newLeader) {
   SSyncNode* pSyncNode = (SSyncNode*)taosAcquireRef(tsNodeRefId, rid);
   if (pSyncNode == NULL) {
-    return false;
+    return TAOS_SYNC_OTHER_ERROR;
   }
-  assert(rid == pSyncNode->rid);
+  ASSERT(rid == pSyncNode->rid);
   int32_t ret = 0;
 
   if (pSyncNode->replicaNum == 1) {
-    taosReleaseRef(tsNodeRefId, pSyncNode->rid);
     sError("only one replica, cannot drop leader");
+    taosReleaseRef(tsNodeRefId, pSyncNode->rid);
     return TAOS_SYNC_ONLY_ONE_REPLICA;
   }
 
   SyncLeaderTransfer* pMsg = syncLeaderTransferBuild(pSyncNode->vgId);
   pMsg->newLeaderId.addr = syncUtilAddr2U64(newLeader.nodeFqdn, newLeader.nodePort);
   pMsg->newLeaderId.vgId = pSyncNode->vgId;
+  pMsg->newNodeInfo = newLeader;
   ASSERT(pMsg != NULL);
   SRpcMsg rpcMsg = {0};
   syncLeaderTransfer2RpcMsg(pMsg, &rpcMsg);
   syncLeaderTransferDestroy(pMsg);
 
-  ret = syncPropose(rid, &rpcMsg, false);
-
+  ret = syncNodePropose(pSyncNode, &rpcMsg, false);
   taosReleaseRef(tsNodeRefId, pSyncNode->rid);
   return ret;
 }
 
-int32_t syncReconfigRaw(int64_t rid, const SSyncCfg* pNewCfg, SRpcMsg* pRpcMsg) {
-  int32_t ret = 0;
-  char*   newconfig = syncCfg2Str((SSyncCfg*)pNewCfg);
-
-  pRpcMsg->msgType = TDMT_SYNC_CONFIG_CHANGE;
-  pRpcMsg->info.noResp = 1;
-  pRpcMsg->contLen = strlen(newconfig) + 1;
-  pRpcMsg->pCont = rpcMallocCont(pRpcMsg->contLen);
-  snprintf(pRpcMsg->pCont, pRpcMsg->contLen, "%s", newconfig);
-  taosMemoryFree(newconfig);
-
-  return ret;
-}
-
 bool syncCanLeaderTransfer(int64_t rid) {
   SSyncNode* pSyncNode = (SSyncNode*)taosAcquireRef(tsNodeRefId, rid);
   if (pSyncNode == NULL) {
@@ -273,8 +348,6 @@ bool syncCanLeaderTransfer(int64_t rid) {
   return matchOK;
 }
 
-int32_t syncGiveUpLeader(int64_t rid) { return 0; }
-
 int32_t syncForwardToPeer(int64_t rid, const SRpcMsg* pMsg, bool isWeak) {
   int32_t ret = syncPropose(rid, pMsg, isWeak);
   return ret;
@@ -469,16 +542,26 @@ int32_t syncPropose(int64_t rid, const SRpcMsg* pMsg, bool isWeak) {
 
   SSyncNode* pSyncNode = taosAcquireRef(tsNodeRefId, rid);
   if (pSyncNode == NULL) {
-    return TAOS_SYNC_PROPOSE_OTHER_ERROR;
+    return TAOS_SYNC_OTHER_ERROR;
   }
   assert(rid == pSyncNode->rid);
+  sDebug("vgId:%d sync event propose msgType:%s", pSyncNode->vgId, TMSG_INFO(pMsg->msgType));
+  ret = syncNodePropose(pSyncNode, pMsg, isWeak);
+
+  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+  return ret;
+}
+
+int32_t syncNodePropose(SSyncNode* pSyncNode, const SRpcMsg* pMsg, bool isWeak) {
+  int32_t ret = TAOS_SYNC_PROPOSE_SUCCESS;
+  sDebug("vgId:%d sync event propose msgType:%s", pSyncNode->vgId, TMSG_INFO(pMsg->msgType));
 
   if (pSyncNode->state == TAOS_SYNC_STATE_LEADER) {
     SRespStub stub;
     stub.createTime = taosGetTimestampMs();
     stub.rpcMsg = *pMsg;
     uint64_t seqNum = syncRespMgrAdd(pSyncNode->pSyncRespMgr, &stub);
-    sDebug("vgId:%d, sync event propose, type:%s seq:%" PRIu64 " handle:%p", pSyncNode->vgId, TMSG_INFO(pMsg->msgType),
+    sDebug("vgId:%d sync event propose, type:%s seq:%" PRIu64 " handle:%p", pSyncNode->vgId, TMSG_INFO(pMsg->msgType),
            seqNum, pMsg->info.handle);
 
     SyncClientRequest* pSyncMsg = syncClientRequestBuild2(pMsg, seqNum, isWeak, pSyncNode->vgId);
@@ -488,16 +571,14 @@ int32_t syncPropose(int64_t rid, const SRpcMsg* pMsg, bool isWeak) {
     if (pSyncNode->FpEqMsg != NULL && (*pSyncNode->FpEqMsg)(pSyncNode->msgcb, &rpcMsg) == 0) {
       ret = TAOS_SYNC_PROPOSE_SUCCESS;
     } else {
-      sTrace("syncPropose pSyncNode->FpEqMsg is NULL");
+      sError("syncPropose pSyncNode->FpEqMsg is NULL");
     }
     syncClientRequestDestroy(pSyncMsg);
   } else {
-    sDebug("vgId:%d, failed to propose since not leader, type:%s handle:%p %s", pSyncNode->vgId,
-           TMSG_INFO(pMsg->msgType), pMsg->info.handle, syncUtilState2String(pSyncNode->state));
+    sError("syncPropose not leader, %s", syncUtilState2String(pSyncNode->state));
     ret = TAOS_SYNC_PROPOSE_NOT_LEADER;
   }
 
-  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
   return ret;
 }
 
@@ -1162,8 +1243,14 @@ void syncNodeUpdateConfig(SSyncNode* pSyncNode, SSyncCfg* newConfig, SyncIndex l
   int32_t oldReplicaNum = pSyncNode->replicaNum;
   SRaftId oldReplicasId[TSDB_MAX_REPLICA];
   memcpy(oldReplicasId, pSyncNode->replicasId, sizeof(oldReplicasId));
-  SSyncSnapshotSender*   oldSenders[TSDB_MAX_REPLICA];
-  memcpy(oldSenders, pSyncNode->senders, sizeof(oldSenders));
+  SSyncSnapshotSender* oldSenders[TSDB_MAX_REPLICA];
+  for (int i = 0; i < TSDB_MAX_REPLICA; ++i) {
+    oldSenders[i] = (pSyncNode->senders)[i];
+    sDebug("vgId:%d sync event save senders %d, %p", pSyncNode->vgId, i, oldSenders[i]);
+    if (gRaftDetailLog) {
+      ;
+    }
+  }
 
   // init internal
   pSyncNode->myNodeInfo = pSyncNode->pRaftCfg->cfg.nodeInfo[pSyncNode->pRaftCfg->cfg.myIndex];
@@ -1195,24 +1282,51 @@ void syncNodeUpdateConfig(SSyncNode* pSyncNode, SSyncCfg* newConfig, SyncIndex l
 
   pSyncNode->quorum = syncUtilQuorum(pSyncNode->pRaftCfg->cfg.replicaNum);
 
-  // reset snapshot senders, memory leak
+  // reset snapshot senders
+
+  // clear new
   for (int i = 0; i < TSDB_MAX_REPLICA; ++i) {
     (pSyncNode->senders)[i] = NULL;
   }
+
+  // reset new
   for (int i = 0; i < pSyncNode->replicaNum; ++i) {
+    // reset sender
+    bool reset = false;
     for (int j = 0; j < TSDB_MAX_REPLICA; ++j) {
       if (syncUtilSameId(&(pSyncNode->replicasId)[i], &oldReplicasId[j])) {
-        char host[128];
+        char     host[128];
         uint16_t port;
         syncUtilU642Addr((pSyncNode->replicasId)[i].addr, host, sizeof(host), &port);
-        sDebug("vgId:%d sync event reset sender for %lu, %s:%d", pSyncNode->vgId, (pSyncNode->replicasId)[i].addr, host, port);
+        sDebug("vgId:%d sync event reset sender for %lu, newIndex:%d, %s:%d, %p", pSyncNode->vgId,
+               (pSyncNode->replicasId)[i].addr, i, host, port, oldSenders[j]);
         (pSyncNode->senders)[i] = oldSenders[j];
+        oldSenders[j] = NULL;
+        reset = true;
+
+        // reset replicaIndex
+        int32_t oldreplicaIndex = (pSyncNode->senders)[i]->replicaIndex;
+        (pSyncNode->senders)[i]->replicaIndex = i;
+        sDebug("vgId:%d sync event udpate replicaIndex from %d to %d, %s:%d, %p, reset:%d", pSyncNode->vgId,
+               oldreplicaIndex, i, host, port, (pSyncNode->senders)[i], reset);
       }
     }
   }
+
+  // create new
   for (int i = 0; i < TSDB_MAX_REPLICA; ++i) {
     if ((pSyncNode->senders)[i] == NULL) {
       (pSyncNode->senders)[i] = snapshotSenderCreate(pSyncNode, i);
+      sDebug("vgId:%d sync event create new sender %p replicaIndex:%d", pSyncNode->vgId, (pSyncNode->senders)[i], i);
+    }
+  }
+
+  // free old
+  for (int i = 0; i < TSDB_MAX_REPLICA; ++i) {
+    if (oldSenders[i] != NULL) {
+      snapshotSenderDestroy(oldSenders[i]);
+      sDebug("vgId:%d sync event delete old sender %p replicaIndex:%d", pSyncNode->vgId, oldSenders[i], i);
+      oldSenders[i] = NULL;
     }
   }
 
@@ -1272,8 +1386,8 @@ void syncNodeUpdateTerm(SSyncNode* pSyncNode, SyncTerm term) {
 }
 
 void syncNodeBecomeFollower(SSyncNode* pSyncNode, const char* debugStr) {
-  sDebug("vgId:%d sync event become follower, isStandBy:%d, %s", pSyncNode->vgId, pSyncNode->pRaftCfg->isStandBy,
-         debugStr);
+  sDebug("vgId:%d sync event become follower, isStandBy:%d, replicaNum:%d, %s", pSyncNode->vgId,
+         pSyncNode->pRaftCfg->isStandBy, pSyncNode->replicaNum, debugStr);
 
   // maybe clear leader cache
   if (pSyncNode->state == TAOS_SYNC_STATE_LEADER) {
@@ -1307,8 +1421,8 @@ void syncNodeBecomeFollower(SSyncNode* pSyncNode, const char* debugStr) {
 //     /\ UNCHANGED <<messages, currentTerm, votedFor, candidateVars, logVars>>
 //
 void syncNodeBecomeLeader(SSyncNode* pSyncNode, const char* debugStr) {
-  sDebug("vgId:%d sync event become leader, isStandBy:%d, %s", pSyncNode->vgId, pSyncNode->pRaftCfg->isStandBy,
-         debugStr);
+  sDebug("vgId:%d sync event become leader, isStandBy:%d, replicaNum:%d %s", pSyncNode->vgId,
+         pSyncNode->pRaftCfg->isStandBy, pSyncNode->replicaNum, debugStr);
 
   // state change
   pSyncNode->state = TAOS_SYNC_STATE_LEADER;
@@ -1857,10 +1971,52 @@ const char* syncStr(ESyncState state) {
 }
 
 static int32_t syncDoLeaderTransfer(SSyncNode* ths, SRpcMsg* pRpcMsg, SSyncRaftEntry* pEntry) {
-  SyncLeaderTransfer* pSyncLeaderTransfer;
-  if (syncUtilSameId(&(pSyncLeaderTransfer->newLeaderId), &(ths->myRaftId))) {
+  SyncLeaderTransfer* pSyncLeaderTransfer = syncLeaderTransferFromRpcMsg2(pRpcMsg);
+
+  /*
+    char     host[128];
+    uint16_t port;
+    syncUtilU642Addr(pSyncLeaderTransfer->newLeaderId.addr, host, sizeof(host), &port);
+    sDebug("vgId:%d sync event, maybe leader transfer to %s:%d %lu", ths->vgId, host, port,
+           pSyncLeaderTransfer->newLeaderId.addr);
+  */
+
+  sDebug("vgId:%d sync event, begin leader transfer", ths->vgId);
+
+  if (strcmp(pSyncLeaderTransfer->newNodeInfo.nodeFqdn, ths->myNodeInfo.nodeFqdn) == 0 &&
+      pSyncLeaderTransfer->newNodeInfo.nodePort == ths->myNodeInfo.nodePort) {
+    sDebug("vgId:%d sync event, maybe leader transfer to %s:%d %lu", ths->vgId,
+           pSyncLeaderTransfer->newNodeInfo.nodeFqdn, pSyncLeaderTransfer->newNodeInfo.nodePort,
+           pSyncLeaderTransfer->newLeaderId.addr);
+
+    // reset elect timer now!
+    int32_t electMS = 1;
+    int32_t ret = syncNodeRestartElectTimer(ths, electMS);
+    ASSERT(ret == 0);
   }
 
+  /*
+    if (syncUtilSameId(&(pSyncLeaderTransfer->newLeaderId), &(ths->myRaftId))) {
+      // reset elect timer now!
+      int32_t electMS = 1;
+      int32_t ret = syncNodeRestartElectTimer(ths, electMS);
+      ASSERT(ret == 0);
+    }
+  */
+  if (ths->pFsm->FpLeaderTransferCb != NULL) {
+    SFsmCbMeta cbMeta;
+    cbMeta.code = 0;
+    cbMeta.currentTerm = ths->pRaftStore->currentTerm;
+    cbMeta.flag = 0;
+    cbMeta.index = pEntry->index;
+    cbMeta.isWeak = pEntry->isWeak;
+    cbMeta.seqNum = pEntry->seqNum;
+    cbMeta.state = ths->state;
+    cbMeta.term = pEntry->term;
+    ths->pFsm->FpLeaderTransferCb(ths->pFsm, pRpcMsg, cbMeta);
+  }
+
+  syncLeaderTransferDestroy(pSyncLeaderTransfer);
   return 0;
 }
 
@@ -1884,26 +2040,31 @@ static int32_t syncNodeConfigChange(SSyncNode* ths, SRpcMsg* pRpcMsg, SSyncRaftE
 
   bool isDrop;
 
-  //if (IamInNew || (!IamInNew && ths->state != TAOS_SYNC_STATE_LEADER)) {
+  // if (IamInNew || (!IamInNew && ths->state != TAOS_SYNC_STATE_LEADER)) {
   if (IamInNew) {
     syncNodeUpdateConfig(ths, &newSyncCfg, pEntry->index, &isDrop);
 
     // change isStandBy to normal
     if (!isDrop) {
+      char tmpbuf[128];
+      snprintf(tmpbuf, sizeof(tmpbuf), "config change from %d to %d", oldSyncCfg.replicaNum, newSyncCfg.replicaNum);
       if (ths->state == TAOS_SYNC_STATE_LEADER) {
-        syncNodeBecomeLeader(ths, "config change");
+        syncNodeBecomeLeader(ths, tmpbuf);
       } else {
-        syncNodeBecomeFollower(ths, "config change");
+        syncNodeBecomeFollower(ths, tmpbuf);
       }
     }
   } else {
-    syncNodeBecomeFollower(ths, "config change2");
+    char tmpbuf[128];
+    snprintf(tmpbuf, sizeof(tmpbuf), "config change2 from %d to %d", oldSyncCfg.replicaNum, newSyncCfg.replicaNum);
+    syncNodeBecomeFollower(ths, tmpbuf);
   }
-  
+
   if (gRaftDetailLog) {
     char* sOld = syncCfg2Str(&oldSyncCfg);
     char* sNew = syncCfg2Str(&newSyncCfg);
-    sInfo("==config change== 0x11 old:%s new:%s isDrop:%d index:%ld \n", sOld, sNew, isDrop, pEntry->index);
+    sInfo("==config change== 0x11 old:%s new:%s isDrop:%d index:%ld IamInNew:%d \n", sOld, sNew, isDrop, pEntry->index,
+          IamInNew);
     taosMemoryFree(sOld);
     taosMemoryFree(sNew);
   }
@@ -1965,7 +2126,7 @@ int32_t syncNodeCommit(SSyncNode* ths, SyncIndex beginIndex, SyncIndex endIndex,
           ASSERT(code == 0);
         }
 
-        // config change
+        // leader transfer
         if (pEntry->originalRpcType == TDMT_SYNC_LEADER_TRANSFER) {
           code = syncDoLeaderTransfer(ths, &rpcMsg, pEntry);
           ASSERT(code == 0);

source/libs/sync/src/syncSnapshot.c

@@ -393,7 +393,7 @@ cJSON *snapshotSender2Json(SSyncSnapshotSender *pSender) {
 
 char *snapshotSender2Str(SSyncSnapshotSender *pSender) {
   cJSON *pJson = snapshotSender2Json(pSender);
-  char * serialized = cJSON_Print(pJson);
+  char  *serialized = cJSON_Print(pJson);
   cJSON_Delete(pJson);
   return serialized;
 }
@@ -514,7 +514,7 @@ cJSON *snapshotReceiver2Json(SSyncSnapshotReceiver *pReceiver) {
     cJSON_AddStringToObject(pFromId, "addr", u64buf);
     {
       uint64_t u64 = pReceiver->fromId.addr;
-      cJSON *  pTmp = pFromId;
+      cJSON   *pTmp = pFromId;
       char     host[128] = {0};
       uint16_t port;
       syncUtilU642Addr(u64, host, sizeof(host), &port);
@@ -538,7 +538,7 @@ cJSON *snapshotReceiver2Json(SSyncSnapshotReceiver *pReceiver) {
 
 char *snapshotReceiver2Str(SSyncSnapshotReceiver *pReceiver) {
   cJSON *pJson = snapshotReceiver2Json(pReceiver);
-  char * serialized = cJSON_Print(pJson);
+  char  *serialized = cJSON_Print(pJson);
   cJSON_Delete(pJson);
   return serialized;
 }
@@ -588,6 +588,8 @@ int32_t syncNodeOnSnapshotSendCb(SSyncNode *pSyncNode, SyncSnapshotSend *pMsg) {
 
         // maybe update lastconfig
         if (pMsg->lastConfigIndex >= SYNC_INDEX_BEGIN) {
+          int32_t oldReplicaNum = pSyncNode->replicaNum;
+
           // update new config myIndex
           bool     IamInNew = false;
           SSyncCfg newSyncCfg = pMsg->lastConfig;
@@ -614,10 +616,12 @@ int32_t syncNodeOnSnapshotSendCb(SSyncNode *pSyncNode, SyncSnapshotSend *pMsg) {
 
           // change isStandBy to normal
           if (!isDrop) {
+            char tmpbuf[128];
+            snprintf(tmpbuf, sizeof(tmpbuf), "config change3 from %d to %d", oldReplicaNum, newSyncCfg.replicaNum);
             if (pSyncNode->state == TAOS_SYNC_STATE_LEADER) {
-              syncNodeBecomeLeader(pSyncNode, "config change");
+              syncNodeBecomeLeader(pSyncNode, tmpbuf);
             } else {
-              syncNodeBecomeFollower(pSyncNode, "config change");
+              syncNodeBecomeFollower(pSyncNode, tmpbuf);
             }
           }
         }

source/libs/sync/test/CMakeLists.txt

 add_executable(syncTest "")
+add_executable(syncRaftIdCheck "")
 add_executable(syncEnvTest "")
 add_executable(syncPingTimerTest "")
 add_executable(syncIOTickQTest "")
@@ -54,6 +55,10 @@ target_sources(syncTest
     PRIVATE
     "syncTest.cpp"
 )
+target_sources(syncRaftIdCheck
+    PRIVATE
+    "syncRaftIdCheck.cpp"
+)
 target_sources(syncEnvTest
     PRIVATE
     "syncEnvTest.cpp"
@@ -257,6 +262,11 @@ target_include_directories(syncTest
     "${TD_SOURCE_DIR}/include/libs/sync"
     "${CMAKE_CURRENT_SOURCE_DIR}/../inc"
 )
+target_include_directories(syncRaftIdCheck
+    PUBLIC
+    "${TD_SOURCE_DIR}/include/libs/sync"
+    "${CMAKE_CURRENT_SOURCE_DIR}/../inc"
+)
 target_include_directories(syncEnvTest
     PUBLIC
     "${TD_SOURCE_DIR}/include/libs/sync"
@@ -508,6 +518,10 @@ target_link_libraries(syncTest
     sync
     gtest_main
 )
+target_link_libraries(syncRaftIdCheck
+    sync
+    gtest_main
+)
 target_link_libraries(syncEnvTest
     sync
     gtest_main

source/libs/sync/test/syncRaftIdCheck.cpp

+#include <gtest/gtest.h>
+#include <stdio.h>
+#include "syncIO.h"
+#include "syncInt.h"
+#include "syncUtil.h"
+
+void usage(char* exe) {
+  printf("Usage: %s host port \n", exe);
+  printf("Usage: %s u64 \n", exe);
+}
+
+int main(int argc, char** argv) {
+  if (argc == 2) {
+    uint64_t u64 = atoll(argv[1]);
+    char     host[128];
+    uint16_t port;
+    syncUtilU642Addr(u64, host, sizeof(host), &port);
+    printf("%lu -> %s:%d \n", u64, host, port);
+
+  } else if (argc == 3) {
+    uint64_t u64;
+    char*    host = argv[1];
+    uint16_t port = atoi(argv[2]);
+    u64 = syncUtilAddr2U64(host, port);
+    printf("%s:%d -> %lu \n", host, port, u64);
+  } else {
+    usage(argv[0]);
+    exit(-1);
+  }
+
+  return 0;
+}

source/libs/sync/test/syncTestTool.cpp

@@ -153,6 +153,16 @@ void ReConfigCb(struct SSyncFSM* pFsm, const SRpcMsg* pMsg, SReConfigCbMeta cbMe
   taosMemoryFree(s);
 }
 
+void LeaderTransferCb(struct SSyncFSM* pFsm, const SRpcMsg* pMsg, SFsmCbMeta cbMeta) {
+  char logBuf[256] = {0};
+  snprintf(logBuf, sizeof(logBuf),
+           "==callback== ==LeaderTransferCb== pFsm:%p, index:%ld, isWeak:%d, code:%d, state:%d %s, flag:%lu, term:%lu "
+           "currentTerm:%lu \n",
+           pFsm, cbMeta.index, cbMeta.isWeak, cbMeta.code, cbMeta.state, syncUtilState2String(cbMeta.state),
+           cbMeta.flag, cbMeta.term, cbMeta.currentTerm);
+  syncRpcMsgLog2(logBuf, (SRpcMsg*)pMsg);
+}
+
 SSyncFSM* createFsm() {
   SSyncFSM* pFsm = (SSyncFSM*)taosMemoryMalloc(sizeof(SSyncFSM));
   memset(pFsm, 0, sizeof(*pFsm));
@@ -172,6 +182,8 @@ SSyncFSM* createFsm() {
   pFsm->FpSnapshotStopWrite = SnapshotStopWrite;
   pFsm->FpSnapshotDoWrite = SnapshotDoWrite;
 
+  pFsm->FpLeaderTransferCb = LeaderTransferCb;
+
   return pFsm;
 }
 
@@ -277,7 +289,8 @@ void usage(char* exe) {
   printf(
       "usage: %s  replicaNum(1-5)  myIndex(0-..)  enableSnapshot(0/1)  lastApplyIndex(>=-1)  lastApplyTerm(>=0)  "
       "writeRecordNum(>=0)  "
-      "isStandBy(0/1)  isConfigChange(0-5)  iterTimes(>=0)  finishLastApplyIndex(>=-1)  finishLastApplyTerm(>=0) \n",
+      "isStandBy(0/1)  isConfigChange(0-5)  iterTimes(>=0)  finishLastApplyIndex(>=-1)  finishLastApplyTerm(>=0) "
+      "leaderTransfer(0/1) \n",
       exe);
 }
 
@@ -294,9 +307,9 @@ SRpcMsg* createRpcMsg(int i, int count, int myIndex) {
 int main(int argc, char** argv) {
   sprintf(tsTempDir, "%s", ".");
   tsAsyncLog = 0;
-  sDebugFlag = DEBUG_SCREEN + DEBUG_FILE + DEBUG_TRACE + DEBUG_INFO + DEBUG_ERROR;
+  sDebugFlag = DEBUG_SCREEN + DEBUG_FILE + DEBUG_TRACE + DEBUG_INFO + DEBUG_ERROR + DEBUG_DEBUG;
 
-  if (argc != 12) {
+  if (argc != 13) {
     usage(argv[0]);
     exit(-1);
   }
@@ -312,12 +325,14 @@ int main(int argc, char** argv) {
   int32_t iterTimes = atoi(argv[9]);
   int32_t finishLastApplyIndex = atoi(argv[10]);
   int32_t finishLastApplyTerm = atoi(argv[11]);
+  int32_t leaderTransfer = atoi(argv[12]);
 
-  sTrace(
+  sInfo(
       "args: replicaNum:%d, myIndex:%d, enableSnapshot:%d, lastApplyIndex:%d, lastApplyTerm:%d, writeRecordNum:%d, "
-      "isStandBy:%d, isConfigChange:%d, iterTimes:%d, finishLastApplyIndex:%d, finishLastApplyTerm:%d",
+      "isStandBy:%d, isConfigChange:%d, iterTimes:%d, finishLastApplyIndex:%d, finishLastApplyTerm:%d, "
+      "leaderTransfer:%d",
       replicaNum, myIndex, enableSnapshot, lastApplyIndex, lastApplyTerm, writeRecordNum, isStandBy, isConfigChange,
-      iterTimes, finishLastApplyIndex, finishLastApplyTerm);
+      iterTimes, finishLastApplyIndex, finishLastApplyTerm, leaderTransfer);
 
   // check parameter
   assert(replicaNum >= 1 && replicaNum <= 5);
@@ -363,24 +378,31 @@ int main(int argc, char** argv) {
 
   //---------------------------
   int32_t alreadySend = 0;
+  int32_t leaderTransferWait = 0;
   while (1) {
     char* simpleStr = syncNode2SimpleStr(pSyncNode);
 
+    leaderTransferWait++;
+    if (leaderTransferWait == 7) {
+      sTrace("begin leader transfer ...");
+      int32_t ret = syncLeaderTransfer(rid);
+    }
+
     if (alreadySend < writeRecordNum) {
       SRpcMsg* pRpcMsg = createRpcMsg(alreadySend, writeRecordNum, myIndex);
       int32_t  ret = syncPropose(rid, pRpcMsg, false);
       if (ret == TAOS_SYNC_PROPOSE_NOT_LEADER) {
-        sTrace("%s value%d write not leader", simpleStr, alreadySend);
+        sTrace("%s value%d write not leader, leaderTransferWait:%d", simpleStr, alreadySend, leaderTransferWait);
       } else {
         assert(ret == 0);
-        sTrace("%s value%d write ok", simpleStr, alreadySend);
+        sTrace("%s value%d write ok, leaderTransferWait:%d", simpleStr, alreadySend, leaderTransferWait);
       }
       alreadySend++;
 
       rpcFreeCont(pRpcMsg->pCont);
       taosMemoryFree(pRpcMsg);
     } else {
-      sTrace("%s", simpleStr);
+      sTrace("%s, leaderTransferWait:%d", simpleStr, leaderTransferWait);
     }
 
     taosMsleep(1000);