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

["Todd Lipcon (JIRA)" <ji...@apache.org>]

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

Todd Lipcon updated MAPREDUCE-3289:
-----------------------------------

    Attachment: 3289-2.txt
                3289-1.txt

Attaching two patches which apply to some version of branch-1, though probably not the tip of it. These two, together, implement the feature in MR1 with the bug fix mentioned above.

I haven't had time to forward-port the patch to MR2 again with this fix, but it should be reasonably straightforward.
                
> 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, 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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