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https://issues.apache.org/jira/browse/YARN-1959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13973869#comment-13973869
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Sandy Ryza commented on YARN-1959:
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The headroom for an app should be set to the min(app's queue's max share,
cluster capacity) - app's queues resources consumed.
> 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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