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https://issues.apache.org/jira/browse/YARN-4781?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15192255#comment-15192255
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Sunil G commented on YARN-4781:
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Thanks [~leftnoteasy] for sharing more thoughts on same. IIUC, this will
majorly deal inbalances within a queue w.r.t resource usage when
FairOrderingPolicy is used, correct?. I think this will be very helpful, So may
be existing PCPP will take of identifying this inbalances or a new
SchedulerMonitor will be created for same. If a new SchedulerMonitor is
planned, YARN-2009 also can make use of the same. Thoughts?
> 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
>
> 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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