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https://issues.apache.org/jira/browse/YARN-5726?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15570098#comment-15570098
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Miklos Szegedi commented on YARN-5726:
--------------------------------------

The code in question appeared in YARN-4356. Ensure the timeline service v.2 is 
disabled cleanly and has no impact when it's turned off. Contributed by Sangjin 
Lee.

> Test exception in 
> TestContainersMonitorResourceChange.testContainersResourceChange when trying 
> to get NMTimelinePublisher
> -------------------------------------------------------------------------------------------------------------------------
>
>                 Key: YARN-5726
>                 URL: https://issues.apache.org/jira/browse/YARN-5726
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Miklos Szegedi
>            Assignee: Miklos Szegedi
>            Priority: Trivial
>
> 2016-10-12 14:38:39,970 WARN  [Container Monitor] 
> monitor.ContainersMonitorImpl (ContainersMonitorImpl.java:run(594)) - 
> Uncaught exception in ContainersMonitorImpl while monitoring resource of 
> container_123456_0001_01_000001
> java.lang.NullPointerException
>       at 
> org.apache.hadoop.yarn.server.nodemanager.containermanager.monitor.ContainersMonitorImpl$MonitoringThread.run(ContainersMonitorImpl.java:587)



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