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https://issues.apache.org/jira/browse/YARN-1959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13974467#comment-13974467
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Jason Lowe commented on YARN-1959:
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Yes, over-reporting of the headroom in the CapacityScheduler is a known issue.
See YARN-1857. I think the calculation for the CapacityScheduler should be
more like min((userLimit-userConsumed), (queueMax-queueConsumed)). The idea
being that one can't go over the user limit but also can't go over what the
queue has free either.
> Fix headroom calculation in Fair Scheduler
> ------------------------------------------
>
> Key: YARN-1959
> URL: https://issues.apache.org/jira/browse/YARN-1959
> Project: Hadoop YARN
> Issue Type: Bug
> Reporter: Sandy Ryza
>
> The Fair Scheduler currently always sets the headroom to 0.
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