[jira] [Commented] (KAFKA-799) Infinite loop trying to start a broker

["Swapnil Ghike (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13598169#comment-13598169 ] 

Swapnil Ghike commented on KAFKA-799:
-------------------------------------

Hmm, I tried booting up zookeeper and a kafka broker but could not reproduce this issue. Do you know any other way of reproducing this issue? Seems like the /brokers/topics/some-topic path in zk has a null stored for its data.

As of now, I am not sure if guarding for null is the right solution or it will merely hide another bug. 
                
> Infinite loop trying to start a broker 
> ---------------------------------------
>
>                 Key: KAFKA-799
>                 URL: https://issues.apache.org/jira/browse/KAFKA-799
>             Project: Kafka
>          Issue Type: Bug
>          Components: controller
>    Affects Versions: 0.8
>         Environment: Mac OS X 10.7.5
>            Reporter: Bob
>            Assignee: Neha Narkhede
>            Priority: Blocker
>              Labels: patch
>
> I followed the quickstart instructions
> https://cwiki.apache.org/confluence/display/KAFKA/Kafka+0.8+Quick+Start
> It caused an infinite loop while trying to start a broker. 
> [2013-03-08 16:55:19,287] ERROR Error while electing or becoming leader on broker 1 (kafka.server.ZookeeperLeaderElector)
> kafka.common.KafkaException: Can't parse json string: null
> at kafka.utils.Json$.liftedTree1$1(Json.scala:20)
> at kafka.utils.Json$.parseFull(Json.scala:16)
> at kafka.utils.ZkUtils$$anonfun$getReplicaAssignmentForTopics$1.apply(ZkUtils.scala:484)
> at kafka.utils.ZkUtils$$anonfun$getReplicaAssignmentForTopics$1.apply(ZkUtils.scala:480)
> at scala.collection.LinearSeqOptimized$class.foreach(LinearSeqOptimized.scala:61)
> at scala.collection.immutable.List.foreach(List.scala:45)
> at kafka.utils.ZkUtils$.getReplicaAssignmentForTopics(ZkUtils.scala:480)
> at kafka.controller.KafkaController.initializeControllerContext(KafkaController.scala:451)
> at kafka.controller.KafkaController.onControllerFailover(KafkaController.scala:225)
> at kafka.controller.KafkaController$$anonfun$1.apply$mcV$sp(KafkaController.scala:87)
> at kafka.server.ZookeeperLeaderElector.elect(ZookeeperLeaderElector.scala:53)
> at kafka.server.ZookeeperLeaderElector$LeaderChangeListener.handleDataDeleted(ZookeeperLeaderElector.scala:106)
> at org.I0Itec.zkclient.ZkClient$6.run(ZkClient.java:549)
> at org.I0Itec.zkclient.ZkEventThread.run(ZkEventThread.java:71)
> Caused by: java.lang.NullPointerException
> at scala.util.parsing.combinator.lexical.Scanners$Scanner.<init>(Scanners.scala:52)
> at scala.util.parsing.json.JSON$.parseRaw(JSON.scala:71)
> at scala.util.parsing.json.JSON$.parseFull(JSON.scala:85)
> at kafka.utils.Json$.liftedTree1$1(Json.scala:17)
> ... 13 more
> I tracked the issue to unhandled Java null string in these 2 methods in ZkUtils: getReplicaAssignmentForTopics, getPartitionAssignmentForTopics.
> I am submitting a patch with the fixes. Now quickstart works fine for me.

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