Naganarasimha G R commented on YARN-5726:

Hi [~miklos.szeg...@cloudera.com],
Looks like YARN-5725 and this are almost same reason that the container Id is 
not found, so could you handle it in a single jira and also check the root 
cause why the container id is not found ?  at first glance looks like container 
id on completion is getting removed from the monitor first and then in the 
NMContext, so not sure about the scenario when the container is not found and 
result in NPE.

> 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
>         Attachments: YARN-5726.000.patch
> 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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