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https://issues.apache.org/jira/browse/HBASE-26480?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17449234#comment-17449234
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Rushabh Shah commented on HBASE-26480:
--------------------------------------
Thank you [~Xiaolin Ha] for the review and merge !
> Close NamedQueueRecorder to allow HMaster/RS to shutdown gracefully
> -------------------------------------------------------------------
>
> Key: HBASE-26480
> URL: https://issues.apache.org/jira/browse/HBASE-26480
> Project: HBase
> Issue Type: Bug
> Affects Versions: 1.7.0
> Reporter: Rushabh Shah
> Assignee: Rushabh Shah
> Priority: Major
> Fix For: 1.8.0
>
>
> Saw one case in our production cluster where RS was not exiting. Saw this
> non-daemon thread in hung RS stack trace:
> {noformat}
> "main.slowlog.append-pool-pool1-t1" #26 prio=5 os_prio=31
> tid=0x00007faf23bf7800 nid=0x6d07 waiting on condition [0x0000700003f4d000]
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x00000004039e3840> (a
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
> at
> com.lmax.disruptor.BlockingWaitStrategy.waitFor(BlockingWaitStrategy.java:47)
> at
> com.lmax.disruptor.ProcessingSequenceBarrier.waitFor(ProcessingSequenceBarrier.java:56)
> at
> com.lmax.disruptor.BatchEventProcessor.processEvents(BatchEventProcessor.java:159)
> at
> com.lmax.disruptor.BatchEventProcessor.run(BatchEventProcessor.java:125)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
> {noformat}
>
> This is coming from
> [NamedQueueRecorder|https://github.com/apache/hbase/blob/branch-1/hbase-server/src/main/java/org/apache/hadoop/hbase/namequeues/NamedQueueRecorder.java#L65]
> implementation.
> This bug doesn't exists in branch-2 and master since the Disruptor
> initialization has changed and we set daemon=true also. See [this
> code|https://github.com/apache/hbase/blob/branch-2/hbase-server/src/main/java/org/apache/hadoop/hbase/namequeues/NamedQueueRecorder.java#L68]
>
> FYI [~vjasani] [~zhangduo]
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