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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-2176) CapacityScheduler loops over all running applications rather than actively requesting apps
Date Tue, 17 Jun 2014 21:31:17 GMT
Jason Lowe created YARN-2176:
--------------------------------

             Summary: CapacityScheduler loops over all running applications rather than actively
requesting apps
                 Key: YARN-2176
                 URL: https://issues.apache.org/jira/browse/YARN-2176
             Project: Hadoop YARN
          Issue Type: Improvement
          Components: capacityscheduler
    Affects Versions: 2.4.0
            Reporter: Jason Lowe


The capacity scheduler performance is primarily dominated by LeafQueue.assignContainers, and
that currently loops over all applications that are running in the queue.  It would be more
efficient if we looped over just the applications that are actively asking for resources rather
than all applications, as there could be thousands of applications running but only a few
hundred that are currently asking for resources.



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