[jira] [Updated] (MAPREDUCE-3289) Make use of fadvise in the NM's shuffle handler

["Arun C Murthy (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAPREDUCE-3289?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Arun C Murthy updated MAPREDUCE-3289:
-------------------------------------

    Fix Version/s:     (was: 1.2.0)
                   1.1.0

I just merged it to branch-1.1 too.
                
> 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
>             Fix For: 1.1.0, 2.0.2-alpha
>
>         Attachments: 3289-1.txt, 3289-2.txt, MAPREDUCE-3289.branch-1.patch, MAPREDUCE-3289.branch-1.patch, MR3289_trunk_2.txt, MR3289_trunk_3.txt, 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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