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https://issues.apache.org/jira/browse/YARN-4781?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16459919#comment-16459919
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Eric Payne commented on YARN-4781:
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I missed one of the two places that needed a check for {{USERLIMIT_FIRST}, so I
uploaded a new patch 005.
{quote}
If more apps are from same user, older one's will be preempted in a fair manner
(which means to satisfy a younger app, older apps may give some container
each). Am I correct?
{quote}
Yes. Basically, youngest containers are preempted from largest apps of the most
over-served users
> Support intra-queue preemption for fairness ordering policy.
> ------------------------------------------------------------
>
> Key: YARN-4781
> URL: https://issues.apache.org/jira/browse/YARN-4781
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: scheduler
> Reporter: Wangda Tan
> Assignee: Eric Payne
> Priority: Major
> Attachments: YARN-4781.001.patch, YARN-4781.002.patch,
> YARN-4781.003.patch, YARN-4781.004.patch, YARN-4781.005.patch
>
>
> We introduced fairness queue policy since YARN-3319, which will let large
> applications make progresses and not starve small applications. However, if a
> large application takes the queue’s resources, and containers of the large
> app has long lifespan, small applications could still wait for resources for
> long time and SLAs cannot be guaranteed.
> Instead of wait for application release resources on their own, we need to
> preempt resources of queue with fairness policy enabled.
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