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From "Eric Payne (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-4390) Consider container request size during CS preemption
Date Tue, 24 Nov 2015 18:26:10 GMT
Eric Payne created YARN-4390:
--------------------------------

             Summary: Consider container request size during CS preemption
                 Key: YARN-4390
                 URL: https://issues.apache.org/jira/browse/YARN-4390
             Project: Hadoop YARN
          Issue Type: Bug
          Components: capacity scheduler
    Affects Versions: 3.0.0, 2.8.0, 2.7.3
            Reporter: Eric Payne
            Assignee: Eric Payne


There are multiple reasons why preemption could unnecessarily preempt containers. One is that
an app could be requesting a large container (say 8-GB), and the preemption monitor could
conceivably preempt multiple containers (say 8, 1-GB containers) in order to fill the large
container request. These smaller containers would then be rejected by the requesting AM and
potentially given right back to the preempted app.



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