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Date: Fri, 27 Jul 2012 05:35:37 +0000 (UTC)
From: "Siddharth Seth (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
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Subject: [jira] [Updated] (MAPREDUCE-3289) Make use of fadvise in the NM's
 shuffle handler
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     [ https://issues.apache.org/jira/browse/MAPREDUCE-3289?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Siddharth Seth updated MAPREDUCE-3289:
--------------------------------------

    Attachment: MR3289_trunk.txt

Patch for trunk. Needs some more work for the recent ssl changes. Also needs some testing.
I'm not sure if this is the best way to do this with Netty. Would like some feedback.
                
> 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, MR3289_trunk.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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