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https://issues.apache.org/jira/browse/KAFKA-462?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jay Kreps resolved KAFKA-462.
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Resolution: Won't Fix
> ZK thread crashing doesn't bring down the broker (and doesn't come back up).
> ----------------------------------------------------------------------------
>
> Key: KAFKA-462
> URL: https://issues.apache.org/jira/browse/KAFKA-462
> Project: Kafka
> Issue Type: Bug
> Components: core
> Affects Versions: 0.7
> Reporter: Matt Jones
>
> I think the simplest explanation is the traceback. The broker had been up
> starting at 2012-07-31 18:45:42,951 (based upon the 'Starting Kafka server'
> log entry), and the error was fixed with a restart of the broker at
> 2012-08-14 20:59:41,581.
> It looks like zookeeper thread crashed, but the broker kept operating as
> usual. The expected behavior would be that the zookeeper thread crashing
> would cause the whole broker to crash, or the zookeeper thread would start
> itself back up.
> [2012-08-08 01:25:13,398] 624270894 [main-SendThread(zookeeper001:2181)] INFO
> org.apache.zookeeper.ClientCnxn - Client session timed out, have not heard
> from server in 8749ms for sessionid 0x138e4edc04c1e50, closing socket
> connection and attempting reconnect
> [2012-08-08 01:25:15,136] 624272632 [main-EventThread] INFO
> org.I0Itec.zkclient.ZkClient - zookeeper state changed (Disconnected)
> [2012-08-08 01:25:15,702] 624273198 [main-SendThread(zookeeper001:2181)]
> INFO org.apache.zookeeper.ClientCnxn - Opening socket connection to server
> zookeeper003/10.125.95.193:2181
> [2012-08-08 01:25:15,704] 624273200 [main-SendThread(zookeeper003:2181)]
> INFO org.apache.zookeeper.ClientCnxn - Socket connection established to
> zookeeper003/10.125.95.193:2181, initiating session
> [2012-08-08 01:25:15,709] 624273205 [main-EventThread] INFO
> org.I0Itec.zkclient.ZkClient - zookeeper state changed (Expired)
> [2012-08-08 01:25:15,709] 624273205 [main-EventThread] INFO
> org.apache.zookeeper.ZooKeeper - Initiating client connection,
> connectString=zookeeper001:2181,zookeeper002:2181,zookeeper003:2181
> sessionTimeout=6000 watcher=org.I0Itec.zkclient.ZkClient@26d66426
> [2012-08-08 01:25:21,514] 624279010 [main-SendThread(zookeeper003:2181)]
> INFO org.apache.zookeeper.ClientCnxn - Unable to reconnect to ZooKeeper
> service, session 0x138e4edc04c1e50 has expired, closing socket connection
> [2012-08-08 01:25:47,135] 624304631 [main-EventThread] ERROR
> org.apache.zookeeper.ClientCnxn - Error while calling watcher
> at
> org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:530)
> at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:506)
> Caused by: org.I0Itec.zkclient.exception.ZkException: Unable to connect to
> zookeeper001:2181,zookeeper002:2181,zookeeper003:2181
> Caused by: java.net.UnknownHostException: zookeeper001
> at org.apache.zookeeper.ClientCnxn.<init>(ClientCnxn.java:386)
> at org.apache.zookeeper.ClientCnxn.<init>(ClientCnxn.java:331)
> at org.apache.zookeeper.ZooKeeper.<init>(ZooKeeper.java:377)
> [2012-08-08 01:25:48,620] 624306116 [main-EventThread] INFO
> org.apache.zookeeper.ClientCnxn - EventThread shut down
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