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From "Sandy Ryza (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-736) Add a multi-resource fair sharing metric
Date Thu, 30 May 2013 20:46:20 GMT
Sandy Ryza created YARN-736:
-------------------------------

             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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