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https://issues.apache.org/jira/browse/KAFKA-1391?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13967960#comment-13967960
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Jun Rao commented on KAFKA-1391:
--------------------------------

At this moment, I am not if it's worth keeping patching the unit tests in 
DeleteTopicTest. We know that we have to make another pass of them when we 
actually fix the delete topic logic itself. We probably can just comment out 
all tests in DeleteTopicTest for now and fix them when we actual fix delete 
topic.

> transient unit test failure in 
> DeleteTopicTest.testPreferredReplicaElectionDuringDeleteTopic
> --------------------------------------------------------------------------------------------
>
>                 Key: KAFKA-1391
>                 URL: https://issues.apache.org/jira/browse/KAFKA-1391
>             Project: Kafka
>          Issue Type: Bug
>    Affects Versions: 0.8.2
>            Reporter: Jun Rao
>
> The test hang due to the following deadlock.
> "Test worker" prio=5 tid=7fd40c0b2800 nid=0x114ebd000 waiting on condition 
> [114eb9000]
>    java.lang.Thread.State: WAITING (parking)
>         at sun.misc.Unsafe.park(Native Method)
>         - parking to wait for  <7f40b2aa0> (a 
> java.util.concurrent.CountDownLatch$Sync)
>         at java.util.concurrent.locks.LockSupport.park(LockSupport.java:156)
>         at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:811)
>         at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:969)
>         at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1281)
>         at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:207)
>         at 
> kafka.utils.ShutdownableThread.shutdown(ShutdownableThread.scala:36)
>         at 
> kafka.controller.TopicDeletionManager.shutdown(TopicDeletionManager.scala:105)
>         at 
> kafka.controller.KafkaController$$anonfun$onControllerResignation$1.apply$mcV$sp(KafkaController.scala:344)
>         at 
> kafka.controller.KafkaController$$anonfun$onControllerResignation$1.apply(KafkaController.scala:340)
>         at 
> kafka.controller.KafkaController$$anonfun$onControllerResignation$1.apply(KafkaController.scala:340)
>         at kafka.utils.Utils$.inLock(Utils.scala:537)
>         at 
> kafka.controller.KafkaController.onControllerResignation(KafkaController.scala:340)
>         at 
> kafka.controller.KafkaController$$anonfun$shutdown$1.apply$mcV$sp(KafkaController.scala:647)
>         at 
> kafka.controller.KafkaController$$anonfun$shutdown$1.apply(KafkaController.scala:645)
>         at 
> kafka.controller.KafkaController$$anonfun$shutdown$1.apply(KafkaController.scala:645)
>         at kafka.utils.Utils$.inLock(Utils.scala:537)
>         at 
> kafka.controller.KafkaController.shutdown(KafkaController.scala:645)
>         at 
> kafka.server.KafkaServer$$anonfun$shutdown$9.apply$mcV$sp(KafkaServer.scala:242)
>         at kafka.utils.Utils$.swallow(Utils.scala:166)
>         at kafka.utils.Logging$class.swallowWarn(Logging.scala:92)
>         at kafka.utils.Utils$.swallowWarn(Utils.scala:45)
>         at kafka.utils.Logging$class.swallow(Logging.scala:94)
>         at kafka.utils.Utils$.swallow(Utils.scala:45)
>         at kafka.server.KafkaServer.shutdown(KafkaServer.scala:242)
>         at 
> kafka.admin.DeleteTopicTest.testPreferredReplicaElectionDuringDeleteTopic(DeleteTopicTest.scala:163)
> "delete-topics-thread" prio=5 tid=7fd409ad2000 nid=0x11b0c2000 waiting on 
> condition [11b0c1000]
>    java.lang.Thread.State: WAITING (parking)
>         at sun.misc.Unsafe.park(Native Method)
>         - parking to wait for  <7f40a7048> (a 
> java.util.concurrent.locks.ReentrantLock$NonfairSync)
>         at java.util.concurrent.locks.LockSupport.park(LockSupport.java:156)
>         at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:811)
>         at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:842)
>         at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1178)
>         at 
> java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(ReentrantLock.java:186)
>         at 
> java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:262)
>         at kafka.utils.Utils$.inLock(Utils.scala:535)
>         at 
> kafka.controller.TopicDeletionManager$DeleteTopicsThread.doWork(TopicDeletionManager.scala:376)
>         at kafka.utils.ShutdownableThread.run(ShutdownableThread.scala:51)



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