[jira] [Resolved] (KAFKA-620) UnknownHostError looking for a ZK node crashes the broker

["Guozhang Wang (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-620?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Guozhang Wang resolved KAFKA-620.
---------------------------------
    Resolution: Duplicate

> UnknownHostError looking for a ZK node crashes the broker
> ---------------------------------------------------------
>
>                 Key: KAFKA-620
>                 URL: https://issues.apache.org/jira/browse/KAFKA-620
>             Project: Kafka
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 0.7.1
>         Environment: linux. Amazon's AMI
>            Reporter: Matthew Rathbone
>
> If you totally kill a zookeeper node so that it's hostname no longer resolves to anything, the broker will die with a java.net.UnknownHostException.
> You will then be unable to restart the broker until the unknown host(s) is removed from the server.properties.
> We ran into this issue while testing our resilience to widespread AWS outages, if you can point me to the right place, I could have a go at fixing it? Unfortunately, I suspect the issue might be in the non-standard Zookeeper library that kafka uses.
> Here's the stack trace:
> org.I0Itec.zkclient.exception.ZkException: Unable to connect to [list of zookeepers]
> 	at org.I0Itec.zkclient.ZkConnection.connect(ZkConnection.java:66)
> 	at org.I0Itec.zkclient.ZkClient.connect(ZkClient.java:872)
> 	at org.I0Itec.zkclient.ZkClient.<init>(ZkClient.java:98)
> 	at org.I0Itec.zkclient.ZkClient.<init>(ZkClient.java:84)
> 	at kafka.server.KafkaZooKeeper.startup(KafkaZooKeeper.scala:44)
> 	at kafka.log.LogManager.<init>(LogManager.scala:87)
> 	at kafka.server.KafkaServer.startup(KafkaServer.scala:58)
> 	at kafka.server.KafkaServerStartable.startup(KafkaServerStartable.scala:34)
> 	at kafka.Kafka$.main(Kafka.scala:50)
> 	at kafka.Kafka.main(Kafka.scala)
> Caused by: java.net.UnknownHostException: zk-101
> 	at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)
> 	at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:850)
> 	at java.net.InetAddress.getAddressFromNameService(InetAddress.java:1201)
> 	at java.net.InetAddress.getAllByName0(InetAddress.java:1154)
> 	at java.net.InetAddress.getAllByName(InetAddress.java:1084)
> 	at java.net.InetAddress.getAllByName(InetAddress.java:1020)
> 	at org.apache.zookeeper.ClientCnxn.<init>(ClientCnxn.java:387)
> 	at org.apache.zookeeper.ClientCnxn.<init>(ClientCnxn.java:332)
> 	at org.apache.zookeeper.ZooKeeper.<init>(ZooKeeper.java:383)
> 	at org.I0Itec.zkclient.ZkConnection.connect(ZkConnection.java:64)
> 	... 9 more



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