Re: When session expired event fired?

[Patrick Hunt]

Here's one that I know of that's open - LinkedIn's Norbert
http://wiki.github.com/rhavyn/norbert/

Patrick

neptune wrote:

Thanks for your quick answer.
I will make cluster member ship service using zookeeper.
If a node in a cluster can't connect to zookeeper cluster, the node killed
by oneself (like google bigtables' tabletserver).
If no session expired, client check disconnected time.
Any idea or usage for cluster membership service using zookeeper?

Thanks.

2010/2/9 Mahadev Konar <maha...@yahoo-inc.com>

Hi,
 a zookeeper client does not expire a session until and unless it is able
to
connect to one of the servers. In your case if you kill all the servers,
the
client is not able to connect to any of the servers and will keep trying to
connect to the three servers. It cannot expire a session on its own and
needs to hear from the server to know if the session is expired or not.

Does that help?

Thanks
mahadev


On 2/8/10 2:37 PM, "neptune" <opennept...@gmail.com> wrote:

Hi all.
I have a question. I started zookeeper(3.2.2) on three servers.
When session expired event fired in following code?
I expected that if client can't connect to server(disconnected) for

session

timeout, zookeeper fires session expired event.
I killed three zookeeper server sequentially. Client retry to connect
zookeeper server. Never occured Expired event.

*class WatcherTest {
  public static void main(String[] args) {
    (new **WatcherTest*()).exec();
*  }

  private WatcherTest() throws Exception {
    zk = new ZooKeeper("server1:2181,server2:2181:server3:2181", 10 *

1000,

this);
  }
  private void exec() {
    while(ture) {
      //do something
    }
  }
  public void process(WatchedEvent event) {
    if (event.getType() == Event.EventType.None) {
      switch (event.getState()) {
      case SyncConnected:
        System.out.println("ZK SyncConnected");
        break;
      case Disconnected:
        System.out.println("ZK Disconnected");
        break;
      case Expired:
        System.out.println("ZK Session Expired");
        System.exit(0);
        break;
      }
    }
}
*