Question

我使用Curator 1.2.4并且当我想监视一个znode以查看其子项的更改时，我一直得到ConnectionLossException。

然后我实现了像这样的观察者

public class CuratorChildWatcherImpl implements CuratorWatcher {

    private CuratorFramework client;

    public CuratorChildWatcherImpl(CuratorFramework client) {
        this.client = client;
    }

    @Override
    public void process(WatchedEvent event) throws Exception {
       List<String> children=client.getChildren().usingWatcher(this).forPath(event.getPath());
       // Do other stuff with the children znode.
    }
}

如果ConnectionLossException设置为10秒，则代码每隔11秒抛出connectionTimeout。似乎异常是connectionTimeout加1秒。为什么呢？

我检查了源代码，发现GetChildrenBuilderImpl将调用CuratorZookeeperClient的blockUntilConnectedOrTimeout方法，该方法每1秒检查一次连接状态。

2013-04-17 17:22:08 [ERROR]-[com.netflix.curator.ConnectionState.getZooKeeper(ConnectionState.java:97)] Connection timed out for connection string (...) and timeout (10000) / elapsed (10317913)
org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = ConnectionLoss
    at com.netflix.curator.ConnectionState.getZooKeeper(ConnectionState.java:94)
    at com.netflix.curator.CuratorZookeeperClient.getZooKeeper(CuratorZookeeperClient.java:107)
    at com.netflix.curator.framework.imps.CuratorFrameworkImpl.getZooKeeper(CuratorFrameworkImpl.java:413)
    at com.netflix.curator.framework.imps.GetChildrenBuilderImpl$3.call(GetChildrenBuilderImpl.java:213)
    at com.netflix.curator.framework.imps.GetChildrenBuilderImpl$3.call(GetChildrenBuilderImpl.java:202)
    at com.netflix.curator.RetryLoop.callWithRetry(RetryLoop.java:106)
    at com.netflix.curator.framework.imps.GetChildrenBuilderImpl.pathInForeground(GetChildrenBuilderImpl.java:198)
    at com.netflix.curator.framework.imps.GetChildrenBuilderImpl.forPath(GetChildrenBuilderImpl.java:190)
    at com.netflix.curator.framework.imps.GetChildrenBuilderImpl.forPath(GetChildrenBuilderImpl.java:37)
    at com.netflix.curator.framework.imps.NamespaceWatcher.process(NamespaceWatcher.java:56)
    at org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:521)

Answer 1

这是在CURATOR-24 The current method of managing hung ZK handles needs improvement下跟踪的Curator / ZooKeeper交互中的一个已知错误。它固定在2.0.1孵化版本中。

何时以及为什么Curator会抛出ConnectionLossException？

1 个答案: