fix(sync) delete assert, due to config change

source/libs/sync/src/syncIndexMgr.c

@@ -60,7 +60,9 @@ void syncIndexMgrSetIndex(SSyncIndexMgr *pSyncIndexMgr, const SRaftId *pRaftId,
       return;
     }
   }
-  assert(0);
+
+  // maybe config change
+  // assert(0);
 }
 
 SyncIndex syncIndexMgrGetIndex(SSyncIndexMgr *pSyncIndexMgr, const SRaftId *pRaftId) {

source/libs/sync/src/syncMain.c

@@ -981,6 +981,7 @@ char* syncNode2SimpleStr(const SSyncNode* pSyncNode) {
 }
 
 void syncNodeUpdateConfig(SSyncNode* pSyncNode, SSyncCfg* newConfig, bool* isDrop) {
+  SSyncCfg oldConfig = pSyncNode->pRaftCfg->cfg;
   pSyncNode->pRaftCfg->cfg = *newConfig;
   int32_t ret = 0;
 
@@ -1014,6 +1015,15 @@ void syncNodeUpdateConfig(SSyncNode* pSyncNode, SSyncCfg* newConfig, bool* isDro
 
   // isDrop
   *isDrop = true;
+  bool IamInOld, IamInNew;
+  for (int i = 0; i < oldConfig.replicaNum; ++i) {
+    if (strcmp((oldConfig.nodeInfo)[i].nodeFqdn, pSyncNode->myNodeInfo.nodeFqdn) == 0 &&
+        (oldConfig.nodeInfo)[i].nodePort == pSyncNode->myNodeInfo.nodePort) {
+      *isDrop = false;
+      break;
+    }
+  }
+
   for (int i = 0; i < newConfig->replicaNum; ++i) {
     if (strcmp((newConfig->nodeInfo)[i].nodeFqdn, pSyncNode->myNodeInfo.nodeFqdn) == 0 &&
         (newConfig->nodeInfo)[i].nodePort == pSyncNode->myNodeInfo.nodePort) {