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https://issues.apache.org/jira/browse/YARN-736?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13682689#comment-13682689
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Sandy Ryza commented on YARN-736:
---------------------------------
Attached an updated patch that takes maximum shares into account.
> Add a multi-resource fair sharing metric
> ----------------------------------------
>
> Key: YARN-736
> URL: https://issues.apache.org/jira/browse/YARN-736
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: scheduler
> Affects Versions: 2.0.4-alpha
> Reporter: Sandy Ryza
> Assignee: Sandy Ryza
> Attachments: YARN-736-1.patch, YARN-736.patch
>
>
> Currently, at a regular interval, the fair scheduler computes a fair memory
> share for each queue and application inside it. This fair share is not used
> for scheduling decisions, but is displayed in the web UI, exposed as a
> metric, and used for preemption decisions.
> With DRF and multi-resource scheduling, assigning a memory share as the fair
> share metric to every queue no longer makes sense. It's not obvious what the
> replacement should be, but probably something like fractional fairness within
> a queue, or distance from an ideal cluster state.
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