Merge pull request #15838 from taosdata/feature/3.0_mhli

refactor(sync): make leader life longer

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

@@ -722,10 +722,12 @@ void vnodeSyncClose(SVnode *pVnode) { syncStop(pVnode->sync); }
 
 bool vnodeIsLeader(SVnode *pVnode) {
   if (!syncIsReady(pVnode->sync)) {
+    vDebug("vgId:%d, vnode not ready", pVnode->config.vgId);
     return false;
   }
 
   if (!pVnode->restored) {
+    vDebug("vgId:%d, vnode not restored", pVnode->config.vgId);
     terrno = TSDB_CODE_APP_NOT_READY;
     return false;
   }

source/libs/sync/src/syncMain.c

@@ -2668,7 +2668,22 @@ int32_t syncDoLeaderTransfer(SSyncNode* ths, SRpcMsg* pRpcMsg, SSyncRaftEntry* p
     syncNodeEventLog(ths, "I am not follower, can not do leader transfer");
     return 0;
   }
-  syncNodeEventLog(ths, "do leader transfer");
+
+  if (!ths->restoreFinish) {
+    syncNodeEventLog(ths, "restore not finish, can not do leader transfer");
+    return 0;
+  }
+
+  if (ths->vgId > 1) {
+    syncNodeEventLog(ths, "I am vnode, can not do leader transfer");
+    return 0;
+  }
+
+  do {
+    char logBuf[128];
+    snprintf(logBuf, sizeof(logBuf), "do leader transfer, index:%ld", pEntry->index);
+    syncNodeEventLog(ths, logBuf);
+  } while (0);
 
   bool sameId = syncUtilSameId(&(pSyncLeaderTransfer->newLeaderId), &(ths->myRaftId));
   bool sameNodeInfo = strcmp(pSyncLeaderTransfer->newNodeInfo.nodeFqdn, ths->myNodeInfo.nodeFqdn) == 0 &&