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