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Date: Thu, 20 May 2010 08:21:04 -0400
From: Gregory Haskins <gregory.haskins@gmail.com>
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To: zookeeper-user@hadoop.apache.org
Subject: problem connecting to zookeeper server
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Hi,

ZooKeeper newbie here, so probably simple 'pilot error', but yet I am
stuck so any help appreciated.

I am trying to stand up a zookeeper environment so I can check things
out.  I have an opensuse 11.2 virtual machine that I run the server in,
and then I try to write a java client to connect to it from an OSX
10.6.3 machine.  No matter what combination of v3.2.2 or v.3.3.1 I try
(e.g. both client and server running v3.2.2, v3.3.1, or mixed) I get an
error similar to the following:

Client side:

Exception in thread "main"
org.apache.zookeeper.KeeperException$ConnectionLossException:
KeeperErrorCode =3D ConnectionLoss for /myapp
        at
org.apache.zookeeper.KeeperException.create(zookeeper:KeeperException.jav=
a):90)
        at
org.apache.zookeeper.KeeperException.create(zookeeper:KeeperException.jav=
a):42)
        at
org.apache.zookeeper.ZooKeeper.create(zookeeper:ZooKeeper.java):608)
        at com.novell.lsg.zookeeperclient.App.run(App.java:32)
        at com.novell.lsg.zookeeperclient.App.main(App.java:50)

Server side:

 2010-05-20 07:59:31,517 - WARN=20
[NIOServerCxn.Factory:2181:NIOServerCnxn@518] - Exception causing close
of session 0x0 due to java.io.IOException: Read error
2010-05-20 07:59:31,518 - INFO=20
[NIOServerCxn.Factory:2181:NIOServerCnxn@857] - closing session:0x0
NIOServerCnxn: java.nio.channels.SocketChannel[connected
local=3D/192.168.1.124:2181 remote=3D/192.168.1.141:50135]

The server side error varies slightly depending on the versions in use
at the time, but its always related to problems reading the client
stream.  In this particular run, I have v3.2.2 running on both sides.=20
Any help appreciated!

In case it matters, here is my client

package com.novell.lsg.zookeeperclient;

import java.util.List;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooKeeper;

/**
 * Hello world!
 *
 */
public class App implements Watcher {

    ZooKeeper zk;
    boolean dead =3D false;

    public App() throws Exception {
        zk =3D new ZooKeeper("192.168.1.124:2181", 0, this);
    }

    private void getChildren() throws Exception {
        List<String> children =3D zk.getChildren("/", true);

        System.out.println("Current child list:");
        for (String child : children) {
            System.out.println(child);
        }
    }

    private void run() throws Exception {
        String znode =3D zk.create("/myapp", null, null,
CreateMode.EPHEMERAL_SEQUENTIAL);

        System.out.println("Created " + znode);
        getChildren();

        try {
            synchronized (this) {
                while (!this.dead) {
                    wait();
                }
            }
        } catch (InterruptedException e) {
        }

        System.out.println("Exiting");
    }

    public static void main(String[] args) throws Exception {
        new App().run();

    }

    public void process(WatchedEvent event) {
        System.out.println("Event: " + event.getType().toString());
    }
}


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