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From "Wangda Tan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-7249) Fix CapacityScheduler NPE issue when a container preempted while the node is being removed
Date Mon, 25 Sep 2017 17:15:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-7249?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16179348#comment-16179348
] 

Wangda Tan commented on YARN-7249:
----------------------------------

[~eepayne] could you help with review? It is a straightforward patch.

> 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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