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From "Jun Rao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-5473) handle ZK session expiration properly when a new session can't be established
Date Mon, 19 Jun 2017 21:38:00 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-5473?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16054781#comment-16054781
] 

Jun Rao commented on KAFKA-5473:
--------------------------------

One thing to note is that the construction of the ZooKeeper object can throw an exception.

org.I0Itec.zkclient.exception.ZkException: Unable to connect to zookeeper.host.xxx.xxx:2181
at org.I0Itec.zkclient.ZkConnection.connect(ZkConnection.java:72)
at org.I0Itec.zkclient.ZkClient.reconnect(ZkClient.java:1289)
at org.I0Itec.zkclient.ZkClient.processStateChanged(ZkClient.java:721)
at org.I0Itec.zkclient.ZkClient.process(ZkClient.java:632)
at org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:530)
at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:505)
Caused by: java.net.UnknownHostException: zookeeper.host.xxx.xxx
at java.net.InetAddress.getAllByName0(InetAddress.java:1280)
at java.net.InetAddress.getAllByName(InetAddress.java:1192)
at java.net.InetAddress.getAllByName(InetAddress.java:1126)
at org.apache.zookeeper.client.StaticHostProvider.<init>(StaticHostProvider.java:61)
at org.apache.zookeeper.ZooKeeper.<init>(ZooKeeper.java:445)
at org.apache.zookeeper.ZooKeeper.<init>(ZooKeeper.java:380)
at org.I0Itec.zkclient.ZkConnection.connect(ZkConnection.java:70)

> handle ZK session expiration properly when a new session can't be established
> -----------------------------------------------------------------------------
>
>                 Key: KAFKA-5473
>                 URL: https://issues.apache.org/jira/browse/KAFKA-5473
>             Project: Kafka
>          Issue Type: Sub-task
>    Affects Versions: 0.9.0.0
>            Reporter: Jun Rao
>
> In https://issues.apache.org/jira/browse/KAFKA-2405, we change the logic in handling
ZK session expiration a bit. If a new ZK session can't be established after session expiration,
we just log an error and continue. However, this can leave the broker in a bad state since
it's up, but not registered from the controller's perspective. Replicas on this broker may
never to be in sync.



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