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https://issues.apache.org/jira/browse/YARN-1959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13974541#comment-13974541
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Sandy Ryza commented on YARN-1959:
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Ah, ok, thanks Jason. With your formula, assuming no user limits, what happens
if queueMax is 100%? All queue maxes are 100% by default in the Capacity
Scheduler, right? If there are two queues both with max 100%, and both using
50% of resources, they would both end up with 50% headroom.
> 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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