[jira] [Created] (KAFKA-1358) Broker throws exception when reconnecting to zookeeper

["Timothy Chen (JIRA)" <ji...@apache.org>]

Timothy Chen created KAFKA-1358:
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             Summary: Broker throws exception when reconnecting to zookeeper
                 Key: KAFKA-1358
                 URL: https://issues.apache.org/jira/browse/KAFKA-1358
             Project: Kafka
          Issue Type: Bug
    Affects Versions: 0.8.1
            Reporter: Timothy Chen
            Assignee: Timothy Chen


A non-controller broker currently if zk session expires and re-established calls onControllerResignation even though it may not be the controller.

The result is that the broker gets exception like this: 

java.lang.NullPointerException
	at kafka.controller.KafkaController$$anonfun$onControllerResignation$1.apply$mcV$sp(KafkaController.scala:340)
	at kafka.controller.KafkaController$$anonfun$onControllerResignation$1.apply(KafkaController.scala:337)
	at kafka.controller.KafkaController$$anonfun$onControllerResignation$1.apply(KafkaController.scala:337)
	at kafka.utils.Utils$.inLock(Utils.scala:538)
	at kafka.controller.KafkaController.onControllerResignation(KafkaController.scala:337)
	at kafka.controller.KafkaController$SessionExpirationListener$$anonfun$handleNewSession$1.apply$mcZ$sp(KafkaController.scala:1068)
	at kafka.controller.KafkaController$SessionExpirationListener$$anonfun$handleNewSession$1.apply(KafkaController.scala:1067)
	at kafka.controller.KafkaController$SessionExpirationListener$$anonfun$handleNewSession$1.apply(KafkaController.scala:1067)
	at kafka.utils.Utils$.inLock(Utils.scala:538)
	at kafka.controller.KafkaController$SessionExpirationListener.handleNewSession(KafkaController.scala:1067)
	at org.I0Itec.zkclient.ZkClient$4.run(ZkClient.java:472)
	at org.I0Itec.zkclient.ZkEventThread.run(ZkEventThread.java:71)




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