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https://issues.apache.org/jira/browse/YARN-4390?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15198795#comment-15198795
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Wangda Tan commented on YARN-4390:
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Hi [~eepayne],
Since YARN-4108 doesn't solve all the issues. (I planned to solve this together
with YARN-4108, but YARN-4108 only tackled half of the problem: when containers
selected, only preempt useful containers). However, we need select container
more clever based on requirement. I'm thinking about this recently and I plan
to make some progresses as soon as possible. May I reopen this JIRA and take
over from you?
> 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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