zhangyz-hd opened a new issue #8985: URL: https://github.com/apache/dubbo/issues/8985
- [x] I have searched the [issues](https://github.com/apache/dubbo/issues) of this repository and believe that this is not a duplicate. - [x] I have checked the [FAQ](https://github.com/apache/dubbo/blob/master/FAQ.md) of this repository and believe that this is not a duplicate. ### Environment * Dubbo version: 3.0.3/3.0.4-SNAPSHOT * Operating System version: ANY * Java version: 8 ### Steps to reproduce this issue 1. 以最简单的demo配置启动服务提供者 ``` dubbo.application.name=dubbo-demo-annotation-provider dubbo.protocol.name=dubbo dubbo.protocol.port=20881 dubbo.application.metadataType=remote dubbo.registry.address=zookeeper://127.0.0.1:2181 dubbo.metadata-report.address=zookeeper://127.0.0.1:2182 ``` 2. 启动后，等待一会儿，退出java进程，出现AbstractServiceDiscovery.update相关的异常日志 ``` org.apache.dubbo.rpc.RpcException: Failed register instance DefaultServiceInstance{, serviceName='dubbo-demo-annotation-provider', host='192.168.3.50', port=20881, enabled=true, healthy=true, metadata={dubbo.metadata-service.url-params={"version":"1.0.0","dubbo":"2.0.2","release":"3.0.4-SNAPSHOT","port":"20881","protocol":"dubbo"}, dubbo.endpoints=[{"port":20881,"protocol":"dubbo"}], dubbo.metadata.revision=0, dubbo.metadata.storage-type=remote}} at org.apache.dubbo.registry.zookeeper.ZookeeperServiceDiscovery.doRegister(ZookeeperServiceDiscovery.java:97) at org.apache.dubbo.registry.client.AbstractServiceDiscovery.register(AbstractServiceDiscovery.java:48) at org.apache.dubbo.registry.zookeeper.ZookeeperServiceDiscovery.doUpdate(ZookeeperServiceDiscovery.java:105) at org.apache.dubbo.registry.client.AbstractServiceDiscovery.update(AbstractServiceDiscovery.java:64) at org.apache.dubbo.registry.client.metadata.ServiceInstanceMetadataUtils.lambda$refreshMetadataAndInstance$2(ServiceInstanceMetadataUtils.java:280) at java.util.ArrayList.forEach(ArrayList.java:1259) at org.apache.dubbo.registry.client.metadata.ServiceInstanceMetadataUtils.refreshMetadataAndInstance(ServiceInstanceMetadataUtils.java:270) at org.apache.dubbo.config.deploy.DefaultApplicationDeployer.lambda$registerServiceInstance$2(DefaultApplicationDeployer.java:714) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) ``` 或 ``` [07/10/21 12:24:30:108 CST] Dubbo-framework-scheduler-thread-1 ERROR deploy.DefaultApplicationDeployer: [DUBBO] Refresh instance and metadata error, dubbo version: 3.0.4-SNAPSHOT, current host: 192.168.3.50 java.lang.RuntimeException at org.apache.dubbo.common.function.ThrowableConsumer.execute(ThrowableConsumer.java:51) at org.apache.dubbo.common.function.ThrowableConsumer.execute(ThrowableConsumer.java:64) at org.apache.dubbo.registry.zookeeper.ZookeeperServiceDiscovery.doInServiceRegistry(ZookeeperServiceDiscovery.java:184) at org.apache.dubbo.registry.zookeeper.ZookeeperServiceDiscovery.doUnregister(ZookeeperServiceDiscovery.java:110) at org.apache.dubbo.registry.client.AbstractServiceDiscovery.unregister(AbstractServiceDiscovery.java:73) at org.apache.dubbo.registry.zookeeper.ZookeeperServiceDiscovery.doUpdate(ZookeeperServiceDiscovery.java:104) at org.apache.dubbo.registry.client.AbstractServiceDiscovery.update(AbstractServiceDiscovery.java:64) at org.apache.dubbo.registry.client.metadata.ServiceInstanceMetadataUtils.lambda$refreshMetadataAndInstance$2(ServiceInstanceMetadataUtils.java:280) at java.util.ArrayList.forEach(ArrayList.java:1259) at org.apache.dubbo.registry.client.metadata.ServiceInstanceMetadataUtils.refreshMetadataAndInstance(ServiceInstanceMetadataUtils.java:270) at org.apache.dubbo.config.deploy.DefaultApplicationDeployer.lambda$registerServiceInstance$2(DefaultApplicationDeployer.java:714) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294) 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) ``` ### 简单分析 1. jvm退出，触发ServiceConfig#unexport，在InMemoryWritableMetadataService#unexportURL中释放了metadataSemaphore 2. 在DefaultApplicationDeployer#registerServiceInstance中，localMetadataService.blockUntilUpdated();获得metadataSemaphore，继续运行后续的ServiceInstanceMetadataUtils.refreshMetadataAndInstance。而此时jvm正在退出，部分对象已经销毁，无法完成一个完整的refreshMetadataAndInstance动作。 -- This is an automated message from the Apache Git Service. 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