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From "Sunil G (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2009) Priority support for preemption in ProportionalCapacityPreemptionPolicy
Date Thu, 06 Oct 2016 18:12:21 GMT

    [ https://issues.apache.org/jira/browse/YARN-2009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15552696#comment-15552696

Sunil G commented on YARN-2009:

HI [~eepayne]
Thanks for sharing the details of the usecase .I have checked this problem and I know why
that scenario is not working.

{{FifoIntraQueuePreemptionPlugin.validateOutSameAppPriorityFromDemand}} is added to ensure
that we should not do preemption for demand from same priority level. This code is hitting
and causing Zero preemption in your scenarios.

I wanted to add a different condition for both scenarios (user-limit alone AND user-limit
+ priority) but I would like to do that in another ticket. So it will be easier to track and
test. This current patch will still handle priority and priority + user-limit.  Thoughts?
[~eepayne] and [~leftnoteasy]

> Priority support for preemption in ProportionalCapacityPreemptionPolicy
> -----------------------------------------------------------------------
>                 Key: YARN-2009
>                 URL: https://issues.apache.org/jira/browse/YARN-2009
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: capacityscheduler
>            Reporter: Devaraj K
>            Assignee: Sunil G
>         Attachments: YARN-2009.0001.patch, YARN-2009.0002.patch, YARN-2009.0003.patch,
YARN-2009.0004.patch, YARN-2009.0005.patch
> While preempting containers based on the queue ideal assignment, we may need to consider
preempting the low priority application containers first.

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