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https://issues.apache.org/jira/browse/KAFKA-824?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14019291#comment-14019291
]
Andrew Olson commented on KAFKA-824:
------------------------------------
Here's another example stack trace that we have seen.
{noformat}
java.lang.NullPointerException
at org.I0Itec.zkclient.ZkConnection.exists(ZkConnection.java:95)
at org.I0Itec.zkclient.ZkClient$3.call(ZkClient.java:439)
at org.I0Itec.zkclient.ZkClient$3.call(ZkClient.java:436)
at org.I0Itec.zkclient.ZkClient.retryUntilConnected(ZkClient.java:675)
at org.I0Itec.zkclient.ZkClient.exists(ZkClient.java:436)
at org.I0Itec.zkclient.ZkClient$12.call(ZkClient.java:846)
at org.I0Itec.zkclient.ZkClient$12.call(ZkClient.java:843)
at org.I0Itec.zkclient.ZkClient.retryUntilConnected(ZkClient.java:675)
at org.I0Itec.zkclient.ZkClient.watchForChilds(ZkClient.java:843)
at org.I0Itec.zkclient.ZkClient.subscribeChildChanges(ZkClient.java:114)
at
kafka.consumer.ZookeeperConsumerConnector.kafka$consumer$ZookeeperConsumerConnector$$reinitializeConsumer(ZookeeperConsumerConnector.scala:713)
at
kafka.consumer.ZookeeperConsumerConnector$WildcardStreamsHandler.(ZookeeperConsumerConnector.scala:756)
at
kafka.consumer.ZookeeperConsumerConnector.createMessageStreamsByFilter(ZookeeperConsumerConnector.scala:145)
at
kafka.javaapi.consumer.ZookeeperConsumerConnector.createMessageStreamsByFilter(ZookeeperConsumerConnector.scala:96)
{noformat}
> java.lang.NullPointerException in commitOffsets
> ------------------------------------------------
>
> Key: KAFKA-824
> URL: https://issues.apache.org/jira/browse/KAFKA-824
> Project: Kafka
> Issue Type: Bug
> Components: consumer
> Affects Versions: 0.7.2
> Reporter: Yonghui Zhao
> Assignee: Neha Narkhede
> Attachments: ZkClient.0.3.txt, ZkClient.0.4.txt, screenshot-1.jpg
>
>
> Neha Narkhede
> "Yes, I have. Unfortunately, I never quite around to fixing it. My guess is
> that it is caused due to a race condition between the rebalance thread and
> the offset commit thread when a rebalance is triggered or the client is
> being shutdown. Do you mind filing a bug ?"
> 2013/03/25 12:08:32.020 WARN [ZookeeperConsumerConnector] []
> 0_lu-ml-test10.bj-1364184411339-7c88f710 exception during commitOffsets
> java.lang.NullPointerException
> at org.I0Itec.zkclient.ZkConnection.writeData(ZkConnection.java:111)
> at org.I0Itec.zkclient.ZkClient$10.call(ZkClient.java:813)
> at org.I0Itec.zkclient.ZkClient.retryUntilConnected(ZkClient.java:675)
> at org.I0Itec.zkclient.ZkClient.writeData(ZkClient.java:809)
> at org.I0Itec.zkclient.ZkClient.writeData(ZkClient.java:777)
> at kafka.utils.ZkUtils$.updatePersistentPath(ZkUtils.scala:103)
> at
> kafka.consumer.ZookeeperConsumerConnector$$anonfun$commitOffsets$2$$anonfun$apply$4.apply(ZookeeperConsumerConnector.scala:251)
> at
> kafka.consumer.ZookeeperConsumerConnector$$anonfun$commitOffsets$2$$anonfun$apply$4.apply(ZookeeperConsumerConnector.scala:248)
> at scala.collection.Iterator$class.foreach(Iterator.scala:631)
> at
> scala.collection.JavaConversions$JIteratorWrapper.foreach(JavaConversions.scala:549)
> at scala.collection.IterableLike$class.foreach(IterableLike.scala:79)
> at
> scala.collection.JavaConversions$JCollectionWrapper.foreach(JavaConversions.scala:570)
> at
> kafka.consumer.ZookeeperConsumerConnector$$anonfun$commitOffsets$2.apply(ZookeeperConsumerConnector.scala:248)
> at
> kafka.consumer.ZookeeperConsumerConnector$$anonfun$commitOffsets$2.apply(ZookeeperConsumerConnector.scala:246)
> at scala.collection.Iterator$class.foreach(Iterator.scala:631)
> at kafka.utils.Pool$$anon$1.foreach(Pool.scala:53)
> at scala.collection.IterableLike$class.foreach(IterableLike.scala:79)
> at kafka.utils.Pool.foreach(Pool.scala:24)
> at
> kafka.consumer.ZookeeperConsumerConnector.commitOffsets(ZookeeperConsumerConnector.scala:246)
> at
> kafka.consumer.ZookeeperConsumerConnector.autoCommit(ZookeeperConsumerConnector.scala:232)
> at
> kafka.consumer.ZookeeperConsumerConnector$$anonfun$1.apply$mcV$sp(ZookeeperConsumerConnector.scala:126)
> at kafka.utils.Utils$$anon$2.run(Utils.scala:58)
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
> at
> java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:351)
> at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:178)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
> at java.lang.Thread.run(Thread.java:722)
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