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From "Todd Lipcon (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-3289) Make use of fadvise in the NM's shuffle handler
Date Fri, 28 Oct 2011 00:09:32 GMT
Make use of fadvise in the NM's shuffle handler
-----------------------------------------------

                 Key: MAPREDUCE-3289
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3289
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
          Components: mrv2, nodemanager, performance
    Affects Versions: 0.23.0
            Reporter: Todd Lipcon
            Assignee: Todd Lipcon


Using the new NativeIO fadvise functions, we can make the NodeManager prefetch map output
before it's send over the socket, and drop it out of the fs cache once it's been sent (since
it's very rare for an output to have to be re-sent). This improves IO efficiency and reduces
cache pollution.

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