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https://issues.apache.org/jira/browse/MAPREDUCE-3289?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13427044#comment-13427044
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Hadoop QA commented on MAPREDUCE-3289:
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-1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12538856/MAPREDUCE-3289.branch-1.patch
against trunk revision .
-1 patch. The patch command could not apply the patch.
Console output:
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/2698//console
This message is automatically generated.
> 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,
> 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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