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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3289) Make use of fadvise in the NM's shuffle handler
Date Thu, 02 Aug 2012 00:52:03 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3289?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13427052#comment-13427052
] 

Arun C Murthy commented on MAPREDUCE-3289:
------------------------------------------

+1 for the trunk patch, looks good - thanks Todd & Sid.

And +1 for Sid's comment that we should keep trunk and branch-1 in sync.
                
> 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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