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https://issues.apache.org/jira/browse/KAFKA-2226?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14565522#comment-14565522
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Yasuhiro Matsuda commented on KAFKA-2226:
-----------------------------------------
Updated reviewboard https://reviews.apache.org/r/34734/diff/
against branch origin/trunk
> NullPointerException in TestPurgatoryPerformance
> ------------------------------------------------
>
> Key: KAFKA-2226
> URL: https://issues.apache.org/jira/browse/KAFKA-2226
> Project: Kafka
> Issue Type: Bug
> Reporter: Onur Karaman
> Assignee: Yasuhiro Matsuda
> Attachments: KAFKA-2226.patch, KAFKA-2226_2015-05-28_17:18:55.patch,
> KAFKA-2226_2015-05-29_10:49:34.patch, KAFKA-2226_2015-05-29_15:04:35.patch
>
>
> A NullPointerException sometimes shows up in TimerTaskList.remove while
> running TestPurgatoryPerformance. I’m on the HEAD of trunk.
> {code}
> > ./bin/kafka-run-class.sh kafka.TestPurgatoryPerformance --key-space-size
> > 100000 --keys 3 --num 100000 --pct50 50 --pct75 75 --rate 1000 --size 50
> > --timeout 20
> SLF4J: Class path contains multiple SLF4J bindings.
> SLF4J: Found binding in
> [jar:file:/Users/okaraman/code/kafka/core/build/dependant-libs-2.10.5/slf4j-log4j12-1.6.1.jar!/org/slf4j/impl/StaticLoggerBinder.class]
> SLF4J: Found binding in
> [jar:file:/Users/okaraman/code/kafka/core/build/dependant-libs-2.10.5/slf4j-log4j12-1.7.6.jar!/org/slf4j/impl/StaticLoggerBinder.class]
> SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an
> explanation.
> SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
> [2015-05-27 10:02:14,782] ERROR [completion thread], Error due to
> (kafka.TestPurgatoryPerformance$CompletionQueue$$anon$1)
> java.lang.NullPointerException
> at kafka.utils.timer.TimerTaskList.remove(TimerTaskList.scala:80)
> at kafka.utils.timer.TimerTaskEntry.remove(TimerTaskList.scala:128)
> at kafka.utils.timer.TimerTask$class.cancel(TimerTask.scala:27)
> at kafka.server.DelayedOperation.cancel(DelayedOperation.scala:50)
> at kafka.server.DelayedOperation.forceComplete(DelayedOperation.scala:71)
> at
> kafka.TestPurgatoryPerformance$CompletionQueue$$anon$1.doWork(TestPurgatoryPerformance.scala:263)
> at kafka.utils.ShutdownableThread.run(ShutdownableThread.scala:60)
> {code}
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