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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, 26 Aug 2016 16:56:20 GMT

    [ https://issues.apache.org/jira/browse/YARN-4945?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15439387#comment-15439387
] 

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

Thanks [~eepayne] for the comments about the interaction b/w inter-queue and intra-queue together.
Its a really a case to consider.

While working on POC, [~leftnoteasy] has mentioned about a case of normalization. We have
to consider that inter-queue preemption is done while doing preemption calculation and selection
for intra-queue. In the initial version of POC, i tried to achieve the basic framework and
a working prototype. But for the version, we need to normalize pre-selected containers before
each round in intra-queue preemption. (i think we can consider user-limit and priority only
for now)
On the same note, we also need to consider case where selected containers are not rejected
in subsequent rounds. Also if same containers are again re-selected in next rounds, we can
consider those containers are already selected and deduct from resourceToObtain. These cases
are handled as of today. 

I think I can add the impl details of this scenario also in the document so that it can come
in first cut. 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.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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