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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3289) Make use of fadvise in the NM's shuffle handler
Date Thu, 02 Aug 2012 00:44:04 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3289?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13427044#comment-13427044
] 

Hadoop QA commented on MAPREDUCE-3289:
--------------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12538856/MAPREDUCE-3289.branch-1.patch
  against trunk revision .

    -1 patch.  The patch command could not apply the patch.

Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/2698//console

This message is automatically generated.
                
> 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
>         Attachments: 3289-1.txt, 3289-2.txt, MAPREDUCE-3289.branch-1.patch, MAPREDUCE-3289.branch-1.patch,
MR3289_trunk.txt, MR3289_trunk_2.txt, MR3289_trunk_3.txt, mr-3289.txt
>
>
> 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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