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Posted to yarn-issues@hadoop.apache.org by "Wangda Tan (JIRA)" <ji...@apache.org> on 2015/04/20 19:21:59 UTC

[jira] [Commented] (YARN-3510) Create an extension of ProportionalCapacityPreemptionPolicy which preempts a number of containers from each application in a way which respects fairness

    [ https://issues.apache.org/jira/browse/YARN-3510?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14503244#comment-14503244 ] 

Wangda Tan commented on YARN-3510:
----------------------------------

Put this as a subtask of YARN-3306 to better tracking.

> Create an extension of ProportionalCapacityPreemptionPolicy which preempts a number of containers from each application in a way which respects fairness
> --------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: YARN-3510
>                 URL: https://issues.apache.org/jira/browse/YARN-3510
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: yarn
>            Reporter: Craig Welch
>            Assignee: Craig Welch
>
> The ProportionalCapacityPreemptionPolicy preempts as many containers from applications as it can during it's preemption run.  For fifo this makes sense, as it is prempting in reverse order & therefore maintaining the primacy of the "oldest".  For fair ordering this does not have the desired effect - instead, it should preempt a number of containers from each application which maintains a fair balance /close to a fair balance between them



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