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https://issues.apache.org/jira/browse/YARN-4227?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14954003#comment-14954003
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Ray Chiang commented on YARN-4227:
----------------------------------

+1 (nonbinding)

The only comment I have is whether it's worth having a unit test for this 
corner case.  It's very peculiar to the implementation.

> FairScheduler: RM quits processing expired container from a removed node
> ------------------------------------------------------------------------
>
>                 Key: YARN-4227
>                 URL: https://issues.apache.org/jira/browse/YARN-4227
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: fairscheduler
>    Affects Versions: 2.3.0, 2.5.0, 2.7.1
>            Reporter: Wilfred Spiegelenburg
>            Assignee: Wilfred Spiegelenburg
>            Priority: Critical
>         Attachments: YARN-4227.patch
>
>
> Under some circumstances the node is removed before an expired container 
> event is processed causing the RM to exit:
> {code}
> 2015-10-04 21:14:01,063 INFO 
> org.apache.hadoop.yarn.util.AbstractLivelinessMonitor: 
> Expired:container_1436927988321_1307950_01_000012 Timed out after 600 secs
> 2015-10-04 21:14:01,063 INFO 
> org.apache.hadoop.yarn.server.resourcemanager.rmcontainer.RMContainerImpl: 
> container_1436927988321_1307950_01_000012 Container Transitioned from 
> ACQUIRED to EXPIRED
> 2015-10-04 21:14:01,063 INFO 
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FSSchedulerApp: 
> Completed container: container_1436927988321_1307950_01_000012 in state: 
> EXPIRED event:EXPIRE
> 2015-10-04 21:14:01,063 INFO 
> org.apache.hadoop.yarn.server.resourcemanager.RMAuditLogger: USER=system_op   
>    OPERATION=AM Released Container TARGET=SchedulerApp     RESULT=SUCCESS  
> APPID=application_1436927988321_1307950 
> CONTAINERID=container_1436927988321_1307950_01_000012
> 2015-10-04 21:14:01,063 FATAL 
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager: Error in 
> handling event type CONTAINER_EXPIRED to the scheduler
> java.lang.NullPointerException
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.completedContainer(FairScheduler.java:849)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.handle(FairScheduler.java:1273)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.handle(FairScheduler.java:122)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager$SchedulerEventDispatcher$EventProcessor.run(ResourceManager.java:585)
>       at java.lang.Thread.run(Thread.java:745)
> 2015-10-04 21:14:01,063 INFO 
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager: Exiting, bbye..
> {code}
> The stack trace is from 2.3.0 but the same issue has been observed in 2.5.0 
> and 2.6.0 by different customers.



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