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From "Sunil G (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4945) [Umbrella] Capacity Scheduler Preemption Within a queue
Date Fri, 09 Sep 2016 16:22:21 GMT

    [ https://issues.apache.org/jira/browse/YARN-4945?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15477484#comment-15477484
] 

Sunil G commented on YARN-4945:
-------------------------------

HI [~leftnoteasy]
Thanks for comments..

I generally understood the overall picture. However one doubt to start with
{{Q.unallocated = Q.used - Q.selected;}}
Here *selected* means guaranteed?

bq.In each leaf queue, according to intra-queue preemption quota and other queue status, such
as queue-policy, decide ideal-allocation and how much to preempt for each app
It makes sense in other policies. For priority, only if demand is there from high priority
apps, we can take resource from lower priority apps. So while doing computing ideal allocation,
we can consider full resources from an app as preemptable. This decision can be taken in preemptionPolicy.
Does this sounds correct with your thoughts?

> [Umbrella] Capacity Scheduler Preemption Within a queue
> -------------------------------------------------------
>
>                 Key: YARN-4945
>                 URL: https://issues.apache.org/jira/browse/YARN-4945
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Wangda Tan
>         Attachments: Intra-Queue Preemption Use Cases.pdf, IntraQueuepreemption-CapacityScheduler
(Design).pdf, YARN-2009-wip.2.patch, YARN-2009-wip.patch, YARN-2009-wip.v3.patch, YARN-2009.v0.patch
>
>
> This is umbrella ticket to track efforts of preemption within a queue to support features
like:
> YARN-2009. YARN-2113. YARN-4781.



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