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Posted to yarn-issues@hadoop.apache.org by "Sandy Ryza (JIRA)" <ji...@apache.org> on 2013/05/30 22:46:20 UTC

[jira] [Created] (YARN-736) Add a multi-resource fair sharing metric

Sandy Ryza created YARN-736:
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             Summary: 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


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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