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Date: Thu, 8 Mar 2012 15:39:58 +0000 (UTC)
From: "Jason Lowe (Created) (JIRA)" <jira@apache.org>
To: mapreduce-dev@hadoop.apache.org
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Subject: [jira] [Created] (MAPREDUCE-3987) Reduce RM app memory footprint
 once app has completed
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Reduce RM app memory footprint once app has completed
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                 Key: MAPREDUCE-3987
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3987
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
          Components: mrv2, resourcemanager
    Affects Versions: 0.23.1
            Reporter: Jason Lowe


The ResourceManager holds onto a configurable number of completed applications (yarn.resource.max-completed-applications, defaults to 10000), and the memory footprint of these completed applications can be significant.  For example, the {{submissionContext}} in RMAppImpl contains references to protocolbuffer objects and other items that probably aren't necessary to keep around once the application has completed.  We could significantly reduce the memory footprint of the RM by releasing objects that are no longer necessary once an application completes.

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