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https://issues.apache.org/jira/browse/YARN-4781?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16458809#comment-16458809
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Sunil G commented on YARN-4781:
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Thanks [~eepayne]
bq.I think that the TAFairOrderingComparator should do what it does in my
latest patch with 2 additions:
Both points makes sense to me. 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?
> 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: Wangda Tan
> Priority: Major
> Attachments: YARN-4781.001.patch, YARN-4781.002.patch,
> YARN-4781.003.patch, YARN-4781.004.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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