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https://issues.apache.org/jira/browse/YARN-7249?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16179553#comment-16179553
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Eric Payne commented on YARN-7249:
----------------------------------
[~leftnoteasy]: Sure. Looking now.
> Fix CapacityScheduler NPE issue when a container preempted while the node is
> being removed
> ------------------------------------------------------------------------------------------
>
> Key: YARN-7249
> URL: https://issues.apache.org/jira/browse/YARN-7249
> Project: Hadoop YARN
> Issue Type: Bug
> Affects Versions: 2.8.1
> Reporter: Wangda Tan
> Assignee: Wangda Tan
> Priority: Blocker
> Attachments: YARN-7249.branch-2.8.001.patch
>
>
> This issue could happen when 3 conditions satisfied:
> 1) A node is removing from scheduler.
> 2) A container running on the node is being preempted.
> 3) A rare race condition causes scheduler pass a null node to leaf queue.
> Fix of the problem is to add a null node check inside CapacityScheduler.
> Stack trace:
> {code}
> 2017-08-31 02:51:24,748 FATAL resourcemanager.ResourceManager
> (ResourceManager.java:run(714)) - Error in handling event type
> KILL_RESERVED_CONTAINER to the scheduler
> java.lang.NullPointerException
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.LeafQueue.completedContainer(LeafQueue.java:1308)
>
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.completedContainerInternal(CapacityScheduler.java:1469)
>
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.AbstractYarnScheduler.completedContainer(AbstractYarnScheduler.java:497)
>
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.killReservedContainer(CapacityScheduler.java:1505)
>
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.handle(CapacityScheduler.java:1341)
>
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.handle(CapacityScheduler.java:127)
>
> at
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager$SchedulerEventDispatcher$EventProcessor.run(ResourceManager.java:705)
>
> {code}
> This is an issue only existed in 2.8.x
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