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https://issues.apache.org/jira/browse/KAFKA-618?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13499309#comment-13499309
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Jun Rao commented on KAFKA-618:
-------------------------------
Thanks for the patch. +1
> Deadlock between leader-finder-thread and consumer-fetcher-thread during
> broker failure
> ---------------------------------------------------------------------------------------
>
> Key: KAFKA-618
> URL: https://issues.apache.org/jira/browse/KAFKA-618
> Project: Kafka
> Issue Type: Bug
> Affects Versions: 0.8
> Reporter: Joel Koshy
> Priority: Blocker
> Fix For: 0.8
>
> Attachments: KAFKA-618-v1.patch
>
>
> This causes the test failure reported in KAFKA-607. This affects high-level
> consumers - if they hit the deadlock then they would get wedged (or at least
> until the consumer timeout).
> Here is the threaddump output that shows the issue:
> Found one Java-level deadlock:
> =============================
> "ConsumerFetcherThread-console-consumer-41755_jkoshy-ld-1353026496639-b0e24a70-0-1":
> waiting for ownable synchronizer 0x00007f2283ad0000, (a
> java.util.concurrent.locks.ReentrantLock$NonfairSync),
> which is held by
> "console-consumer-41755_jkoshy-ld-1353026496639-b0e24a70-leader-finder-thread"
> "console-consumer-41755_jkoshy-ld-1353026496639-b0e24a70-leader-finder-thread":
> waiting to lock monitor 0x00007f2288297190 (object 0x00007f2283ab01d0, a
> java.lang.Object),
> which is held by
> "ConsumerFetcherThread-console-consumer-41755_jkoshy-ld-1353026496639-b0e24a70-0-1"
> Java stack information for the threads listed above:
> ===================================================
> "ConsumerFetcherThread-console-consumer-41755_jkoshy-ld-1353026496639-b0e24a70-0-1":
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x00007f2283ad0000> (a
> java.util.concurrent.locks.ReentrantLock$NonfairSync)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
> 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.consumer.ConsumerFetcherManager.getPartitionTopicInfo(ConsumerFetcherManager.scala:131)
> at
> kafka.consumer.ConsumerFetcherThread.processPartitionData(ConsumerFetcherThread.scala:43)
> at
> kafka.server.AbstractFetcherThread$$anonfun$doWork$5.apply(AbstractFetcherThread.scala:116)
> at
> kafka.server.AbstractFetcherThread$$anonfun$doWork$5.apply(AbstractFetcherThread.scala:99)
> at scala.collection.immutable.Map$Map1.foreach(Map.scala:105)
> at
> kafka.server.AbstractFetcherThread.doWork(AbstractFetcherThread.scala:99)
> - locked <0x00007f2283ab01d0> (a java.lang.Object)
> at kafka.utils.ShutdownableThread.run(ShutdownableThread.scala:50)
> "console-consumer-41755_jkoshy-ld-1353026496639-b0e24a70-leader-finder-thread":
> at
> kafka.server.AbstractFetcherThread.addPartition(AbstractFetcherThread.scala:142)
> - waiting to lock <0x00007f2283ab01d0> (a java.lang.Object)
> at
> kafka.server.AbstractFetcherManager.addFetcher(AbstractFetcherManager.scala:49)
> - locked <0x00007f2283ab0338> (a java.lang.Object)
> at
> kafka.consumer.ConsumerFetcherManager$$anon$1$$anonfun$doWork$5.apply(ConsumerFetcherManager.scala:81)
> at
> kafka.consumer.ConsumerFetcherManager$$anon$1$$anonfun$doWork$5.apply(ConsumerFetcherManager.scala:76)
> at
> scala.collection.mutable.HashMap$$anonfun$foreach$1.apply(HashMap.scala:80)
> at
> scala.collection.mutable.HashMap$$anonfun$foreach$1.apply(HashMap.scala:80)
> at scala.collection.Iterator$class.foreach(Iterator.scala:631)
> at
> scala.collection.mutable.HashTable$$anon$1.foreach(HashTable.scala:161)
> at
> scala.collection.mutable.HashTable$class.foreachEntry(HashTable.scala:194)
> at scala.collection.mutable.HashMap.foreachEntry(HashMap.scala:39)
> at scala.collection.mutable.HashMap.foreach(HashMap.scala:80)
> at
> kafka.consumer.ConsumerFetcherManager$$anon$1.doWork(ConsumerFetcherManager.scala:76)
> at kafka.utils.ShutdownableThread.run(ShutdownableThread.scala:50)
> Found 1 deadlock.
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