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https://issues.apache.org/jira/browse/YARN-8178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16443268#comment-16443268
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Konstantinos Karanasos commented on YARN-8178:
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This sounds interesting, [~Zian Chen]! I am curious to learn more details,
especially about when exactly demotion will kick in and which containers will
be chosen for demotion.
> [Umbrella] Resource Over-commitment Based on Opportunistic Container
> Preemption
> -------------------------------------------------------------------------------
>
> Key: YARN-8178
> URL: https://issues.apache.org/jira/browse/YARN-8178
> Project: Hadoop YARN
> Issue Type: New Feature
> Components: capacity scheduler
> Reporter: Zian Chen
> Priority: Major
>
> We want to provide an opportunistic container-based solution to achieve more
> aggressive preemption with shorter preemption monitoring interval.
> Instead of allowing applications to allocate resources with a mix of
> guaranteed and opportunistic containers, we allow newly submitted
> applications to only contain guaranteed containers. Meanwhile, we change the
> preemption logic to, instead of killing containers, demote guaranteed
> containers into opportunistic ones, so that when there are new applications
> submitted, we can ensure that these containers can be launched by preempting
> opportunistic containers.
> This approach is related to YARN-1011 but achieves over-commitment in a
> different way. However, we rely on opportunistic container part implemented
> in YARN-1011 to make our design work well.
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