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https://issues.apache.org/jira/browse/YARN-4781?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16487902#comment-16487902
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Eric Payne commented on YARN-4781:
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bq. FairOrdering policy could be used with weights?
[~sunilg], the fair ordering preemption will generally select the
smaller-weigted users first even when those containers are older. It's a
hierarchy of priority ordering, though, and it does still try to be "fair," so
you could have a situation where the youngest containers are selected even
though they are owned by a more heavily-weighted user.
> 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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