apache-curator

I am facing a strange NPE when starting Apache Curator's ServiceProvider . This happens intermittently on the servers, but I was not able to reproduce the error locally, that's why it's so difficult to know what's the problem. Here's the code: CuratorFramework curatorFramework = CuratorFrameworkFactory.newClient(zookeeperConnectString, new RetryNTimes(5, 1000)); curatorFramework.start(); ServiceDiscovery<Void> serviceDiscovery = ServiceDiscoveryBuilder.builder(Void.class).basePath(ZK_BASE_PATH).client(curatorFramework).build(); serviceDiscovery.start(); ServiceProvider<Void> serviceProvider =

How to programmatically detect which server in a ZooKeeper ensemble a client is connected to? I'm using the Apache Curator API and I am listening for state changes in connection by registering ConnectionStateListener . I would like to know which server in the ensemble a client is connected to when the client reconnects if the server it was connected to goes down. You can see this in the logs produced by Curator. In the example output below, the CuratorFramework client has been given 4 different ZooKeeper instances in the connectionString that it can connect to. As can be seen in the log, it

I use Curator 1.2.4 and I keep getting ConnectionLossException when I want to monitor one znode for its children's changes. I then implemented a watcher like this 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. } } Every 11 seconds the code throws

This is the code mentioned on kazoo readthedocs election=zk.Election("/electionpath", "my-identifier") what are the input arguments to be passed to make particular node as leader? (i.e what does /electionpath and my-identifier refers here?) In Short: "/electionpath" is your path of interest where you will be creating nodes, adding data and watching nodes using dataWatchers. "my-identifier" is identifier to the non re-entrant lock which will be used to verify who is the leader out of the contenders and allow writes only to leader. In Detail: To simplify it explaining first why there should be