[jira] [Updated] (YARN-4661) Per-queue preemption policy in FairScheduler

["Karthik Kambatla (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/YARN-4661?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Karthik Kambatla updated YARN-4661:
-----------------------------------
    Issue Type: Sub-task  (was: Wish)
        Parent: YARN-4752

> Per-queue preemption policy in FairScheduler
> --------------------------------------------
>
>                 Key: YARN-4661
>                 URL: https://issues.apache.org/jira/browse/YARN-4661
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: fairscheduler
>    Affects Versions: 2.6.0
>            Reporter: He Tianyi
>            Priority: Minor
>
> When {{FairScheduler}} needs to preempt container, it tries to find a container by hierachically sorting and selecting {{AppSchedulable}} with most 'over fairshare' (in {{FairSharePolicy}}), and pick its latest launched container.
> In some case, strategy above become non-optimal, one may want to kill latest container (not {{AppSchedulable}}) launched in the queue for better trade-off between fairness and efficiency. Since most app with over fairshare tend to be started longer ago than other apps, perhaps even its latent launch container is running quite some time.
> Maybe besides {{policy}}, we make it possible to also specify a {{preemptionPolicy}} only for selecting container to preempt, without changing scheduling policy.
> For example:
> {quote}
> <queue name="queueA">
>   <preemptionPolicy>fifo</preemptionPolicy>
>   <policy>fair</policy>
> </queue>
> {quote}
> Any suggestions or comments?



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