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From "Wangda Tan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4390) Do surgical preemption based on reserved container in CapacityScheduler
Date Wed, 07 Dec 2016 22:38:58 GMT

    [ https://issues.apache.org/jira/browse/YARN-4390?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15730161#comment-15730161
] 

Wangda Tan commented on YARN-4390:
----------------------------------

Hi [~eepayne],

Thanks for update, the patch LGTM except the javac warning: getMemory() should be replaced
by getMemorySize().

> Do surgical preemption based on reserved container in CapacityScheduler
> -----------------------------------------------------------------------
>
>                 Key: YARN-4390
>                 URL: https://issues.apache.org/jira/browse/YARN-4390
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: capacity scheduler
>    Affects Versions: 2.8.0, 2.7.3, 3.0.0-alpha1
>            Reporter: Eric Payne
>            Assignee: Wangda Tan
>             Fix For: 2.9.0, 3.0.0-alpha1
>
>         Attachments: QueueNotHittingMax.jpg, YARN-4390-design.1.pdf, YARN-4390-test-results.pdf,
YARN-4390.1.patch, YARN-4390.2.patch, YARN-4390.3.branch-2.patch, YARN-4390.3.patch, YARN-4390.4.patch,
YARN-4390.5.patch, YARN-4390.6.patch, YARN-4390.7.patch, YARN-4390.8.patch, YARN-4390.branch-2.8.001.patch,
YARN-4390.branch-2.8.002.patch
>
>
> 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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