Question

我只是使用org.apache.zookeeper.server.ZooKeeperServerMain.runFromConfig(ServerConfig)方法启动了zookeeper服务器（3.4.6），然后尝试将其关闭。在关机期间，我得到了这个：

11:43:11,176 WARN {main} [org.apache.zookeeper.jmx.MBeanRegistry] Failed to unregister MBean InMemoryDataTree
11:43:11,176 WARN {main} [org.apache.zookeeper.jmx.MBeanRegistry] Error during unregister
javax.management.InstanceNotFoundException: org.apache.ZooKeeperService:name0=StandaloneServer_port-1,name1=InMemoryDataTree
    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getMBean(DefaultMBeanServerInterceptor.java:1095)
    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.exclusiveUnregisterMBean(DefaultMBeanServerInterceptor.java:427)
    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.unregisterMBean(DefaultMBeanServerInterceptor.java:415)
    at com.sun.jmx.mbeanserver.JmxMBeanServer.unregisterMBean(JmxMBeanServer.java:546)
    at org.apache.zookeeper.jmx.MBeanRegistry.unregister(MBeanRegistry.java:115)
    at org.apache.zookeeper.jmx.MBeanRegistry.unregister(MBeanRegistry.java:132)
    at org.apache.zookeeper.server.ZooKeeperServer.unregisterJMX(ZooKeeperServer.java:465)
    at org.apache.zookeeper.server.ZooKeeperServer.shutdown(ZooKeeperServer.java:458)
    at org.apache.zookeeper.server.NIOServerCnxnFactory.shutdown(NIOServerCnxnFactory.java:271)
    at org.apache.zookeeper.server.ZooKeeperServerMain.shutdown(ZooKeeperServerMain.java:132)
...

遗憾的是，我不知道取消注册MBean InMemoryDataTree 的错误是什么意思。除了某些项目构建的日志之外，我没有找到任何搜索引擎。我可以阅读代码，但显然需要很多时间来理解它。

我是否必须在启动过程中更改某些内容以摆脱这种情况，或者这是否完全正常？

Answer 1

日志表明它是一个警告，通过查看源和注释，可以在很大程度上被忽略。根据我的经验，我不记得看到那些特定的消息，但一直遇到运行时异常/错误，使后续的单元测试无法运行，导致我的gradle构建退出测试任务而不生成报告。

我不知道你是怎么试图关闭ZookeeperServerMain的，但我的工作是扩展ZookeeperServerMain以便我可以访问它的受保护的关闭方法。

public class MyZookeeperServerMain extends ZookeeperServerMain{
    ...
    public void openZoo() {
    /**/
    Properties startupProperties = createProperties(DEFAULT_LOG_DIR, 2181);

    QuorumPeerConfig quorumConfiguration = new QuorumPeerConfig();
    try {
        quorumConfiguration.parseProperties(startupProperties);
    } catch (Exception e) {
        throw new RuntimeException(e);
    }

    zooKeeperServer = new MyZookeeperServerMain();
    final ServerConfig configuration = new ServerConfig();
    configuration.readFrom(quorumConfiguration);

    zooEntrance = new Thread() {
        public void run() {
            try {
                zooKeeperServer.runFromConfig(configuration);
            }
            catch (IOException e) {
                LOG.error("ZooKeeper Failed", e);
            }
            catch(Exception ie)
            {
                LOG.debug("shutting down zookeeper", ie);
            }
            catch(Error e)
            {
                System.out.println("error stopping zooKeeper: " + e);
            }
        }
    };
    zooEntrance.start();
  }

  public void closeZoo() {
    zooKeeperServer.shutdown();
  }
}

嵌入式ZooKeeper Server关闭期间发出警告

1 个答案: