[GitHub] [shardingsphere] caqhy commented on pull request #20984: Support Nacos to persist metadata in cluster mode

[GitBox <gi...@apache.org>]

caqhy commented on PR #20984:
URL: https://github.com/apache/shardingsphere/pull/20984#issuecomment-1246775707

   when etcd listener triggers in cluster mode，application throws NPE.
   ```[ERROR] 2022-09-14 21:31:54.592 [grpc-default-executor-1] c.g.common.eventbus.EventBus.default - Exception thrown by subscriber method renew(org.apache.shardingsphere.mode.manager.cluster.coordinator.registry.config.event.rule.RuleConfigurationsChangedEvent) on subscriber org.apache.shardingsphere.mode.manager.cluster.coordinator.ClusterContextManagerCoordinator@6ea246af when dispatching event: org.apache.shardingsphere.mode.manager.cluster.coordinator.registry.config.event.rule.RuleConfigurationsChangedEvent@36eaf53b
   java.lang.NullPointerException: null
   	at org.apache.shardingsphere.mode.manager.ContextManager.getStaleResourceHeldRules(ContextManager.java:325)
   	at org.apache.shardingsphere.mode.manager.ContextManager.alterRuleConfiguration(ContextManager.java:271)
   	at org.apache.shardingsphere.mode.manager.cluster.coordinator.ClusterContextManagerCoordinator.renew(ClusterContextManagerCoordinator.java:149)
   	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
   	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   	at java.lang.reflect.Method.invoke(Method.java:498)
   	at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:87)
   	at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:144)
   	at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:72)
   	at com.google.common.util.concurrent.DirectExecutor.execute(DirectExecutor.java:30)
   	at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:67)
   	at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:108)
   	at com.google.common.eventbus.EventBus.post(EventBus.java:212)
   	at org.apache.shardingsphere.infra.util.eventbus.EventBusContext.post(EventBusContext.java:51)
   	at java.util.Optional.ifPresent(Optional.java:159)
   	at org.apache.shardingsphere.mode.manager.cluster.coordinator.registry.GovernanceWatcherFactory.lambda$watch$0(GovernanceWatcherFactory.java:59)
   	at org.apache.shardingsphere.mode.repository.cluster.etcd.EtcdRepository.lambda$watch$2(EtcdRepository.java:157)
   	at io.etcd.jetcd.Watch$1.onNext(Watch.java:168)
   	at io.etcd.jetcd.WatchImpl$WatcherImpl.onNext(WatchImpl.java:289)
   	at io.etcd.jetcd.WatchImpl$WatcherImpl.onNext(WatchImpl.java:111)
   	at io.grpc.stub.ClientCalls$StreamObserverToCallListenerAdapter.onMessage(ClientCalls.java:465)
   	at io.grpc.ForwardingClientCallListener.onMessage(ForwardingClientCallListener.java:33)
   	at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1MessagesAvailable.runInternal(ClientCallImpl.java:652)
   	at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1MessagesAvailable.runInContext(ClientCallImpl.java:637)
   	at io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37)
   	at io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:123)
   	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
   	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
   	at java.lang.Thread.run(Thread.java:748)


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