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From "Wangda Tan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3510) Create an extension of ProportionalCapacityPreemptionPolicy which preempts a number of containers from each application in a way which respects fairness
Date Wed, 03 Jun 2015 20:19:38 GMT

    [ https://issues.apache.org/jira/browse/YARN-3510?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14571575#comment-14571575
] 

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

[~sunilg],
bq.  and in general if the new approach gives a more fair preemption, then we can move to
that.
The approach mentioend by [~cwelch] at https://issues.apache.org/jira/browse/YARN-3510?focusedCommentId=14571405&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14571405
is the "true fair". You can come back to look at the patch once it is uploaded.

> 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
>         Attachments: YARN-3510.2.patch, YARN-3510.3.patch, YARN-3510.5.patch, YARN-3510.6.patch
>
>
> 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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