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https://issues.apache.org/jira/browse/YARN-6695?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16736803#comment-16736803
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Wangda Tan commented on YARN-6695:
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Thanks [~eyang]/[~rohithsharma], I'm going to update target version to next
release and unblock 3.1.2 and 3.2.0.
> Race condition in RM for publishing container events vs appFinished events
> causes NPE
> --------------------------------------------------------------------------------------
>
> Key: YARN-6695
> URL: https://issues.apache.org/jira/browse/YARN-6695
> Project: Hadoop YARN
> Issue Type: Bug
> Reporter: Rohith Sharma K S
> Priority: Critical
> Attachments: YARN-6695.001.patch
>
>
> When RM publishes container events i.e by enabling
> *yarn.rm.system-metrics-publisher.emit-container-events*, there is race
> condition for processing events
> vs appFinished event that removes appId from collector list which cause NPE.
> Look at the below trace where appId is removed from collectors first and then
> corresponding events are processed.
> {noformat}
> 2017-06-06 19:28:48,896 INFO capacity.ParentQueue
> (ParentQueue.java:removeApplication(472)) - Application removed - appId:
> application_1496758895643_0005 user: root leaf-queue of parent: root
> #applications: 0
> 2017-06-06 19:28:48,921 INFO collector.TimelineCollectorManager
> (TimelineCollectorManager.java:remove(190)) - The collector service for
> application_1496758895643_0005 was removed
> 2017-06-06 19:28:48,922 ERROR metrics.TimelineServiceV2Publisher
> (TimelineServiceV2Publisher.java:putEntity(451)) - Error when publishing
> entity TimelineEntity[type='YARN_CONTAINER',
> id='container_e01_1496758895643_0005_01_000002']
> java.lang.NullPointerException
> at
> org.apache.hadoop.yarn.server.resourcemanager.metrics.TimelineServiceV2Publisher.putEntity(TimelineServiceV2Publisher.java:448)
> at
> org.apache.hadoop.yarn.server.resourcemanager.metrics.TimelineServiceV2Publisher.access$100(TimelineServiceV2Publisher.java:72)
> at
> org.apache.hadoop.yarn.server.resourcemanager.metrics.TimelineServiceV2Publisher$TimelineV2EventHandler.handle(TimelineServiceV2Publisher.java:480)
> at
> org.apache.hadoop.yarn.server.resourcemanager.metrics.TimelineServiceV2Publisher$TimelineV2EventHandler.handle(TimelineServiceV2Publisher.java:469)
> at
> org.apache.hadoop.yarn.event.AsyncDispatcher.dispatch(AsyncDispatcher.java:201)
> at
> org.apache.hadoop.yarn.event.AsyncDispatcher$1.run(AsyncDispatcher.java:127)
> at java.lang.Thread.run(Thread.java:745)
> {noformat}
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