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From "Siddharth Seth (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-3289) Make use of fadvise in the NM's shuffle handler
Date Thu, 02 Aug 2012 00:10:03 GMT

     [ 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_3.txt

Fixes the findbugs warnings.

I've left the configs in ShuffleHandler itself. MRConfig doesn't seem like the right place
- since Shuffle is an Aux Service for yarn, which doesn't necessarily need MR classes to run.

Regarding the parameter names - I think it's better to use the same in both patches, as against
introducing a parameter in branch-1 and deprecating it immediately in the the branch-2 patch.
Brandon, could you please make this change in the branch-1 patch you had posted.
                
> 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,
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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