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https://issues.apache.org/jira/browse/YARN-5725?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15586937#comment-15586937
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Daniel Templeton commented on YARN-5725:
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If it's a test-only issue, have you look at fixing it at the source by putting
something in that collection so that there isn't an NPE in the first place?
In any case making the code a little more defensive is probably a good thing.
> Test uncaught exception in
> TestContainersMonitorResourceChange.testContainersResourceChange when setting
> IP and host
> --------------------------------------------------------------------------------------------------------------------
>
> Key: YARN-5725
> URL: https://issues.apache.org/jira/browse/YARN-5725
> Project: Hadoop YARN
> Issue Type: Bug
> Reporter: Miklos Szegedi
> Assignee: Miklos Szegedi
> Priority: Minor
> Attachments: YARN-5725.000.patch, YARN-5725.001.patch
>
> Original Estimate: 2h
> Remaining Estimate: 2h
>
> The issue is a warning but it prevents container monitor to continue
> 2016-10-12 14:38:23,280 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:455)
> 2016-10-12 14:38:23,281 WARN [Container Monitor]
> monitor.ContainersMonitorImpl (ContainersMonitorImpl.java:run(613)) -
> org.apache.hadoop.yarn.server.nodemanager.containermanager.monitor.ContainersMonitorImpl
> is interrupted. Exiting.
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