[jira] [Commented] (MAPREDUCE-6311) AM JVM hungs after job unregister and finished

["Rohith (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAPREDUCE-6311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14482704#comment-14482704 ] 

Rohith commented on MAPREDUCE-6311:
-----------------------------------

Extracting thread dump, ScheduledThreadPoolExecutor is started while starting MRAppMaster but is not stopped during shutdown. The stack trace can be seen for the same.
{noformat}
"pool-6-thread-1" prio=10 tid=0x00007fe3d0dc7000 nid=0xb4a waiting on condition [0x00007fe3d4643000]
   java.lang.Thread.State: TIMED_WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000f216dc08> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
	at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:226)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2082)
	at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1090)
	at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:807)
	at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1068)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)
{noformat}

> AM JVM hungs after job unregister and finished
> ----------------------------------------------
>
>                 Key: MAPREDUCE-6311
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6311
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>            Reporter: Rohith
>            Assignee: Rohith
>         Attachments: MR_TD.out
>
>
> It is observed that MRAppMaster JVM hungs after unregistered with ResourceManager.



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