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Posted to yarn-issues@hadoop.apache.org by "Eric Payne (JIRA)" <ji...@apache.org> on 2015/11/24 19:28:10 UTC

[jira] [Commented] (YARN-4390) Consider container request size during CS preemption

    [ https://issues.apache.org/jira/browse/YARN-4390?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15025044#comment-15025044 ] 

Eric Payne commented on YARN-4390:
----------------------------------

One approach to alleviate this would be to add a buffer zone around the pending calculations for resources on a particular queue.


> Consider container request size during CS preemption
> ----------------------------------------------------
>
>                 Key: YARN-4390
>                 URL: https://issues.apache.org/jira/browse/YARN-4390
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: capacity scheduler
>    Affects Versions: 3.0.0, 2.8.0, 2.7.3
>            Reporter: Eric Payne
>            Assignee: Eric Payne
>
> There are multiple reasons why preemption could unnecessarily preempt containers. One is that an app could be requesting a large container (say 8-GB), and the preemption monitor could conceivably preempt multiple containers (say 8, 1-GB containers) in order to fill the large container request. These smaller containers would then be rejected by the requesting AM and potentially given right back to the preempted app.



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