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https://issues.apache.org/jira/browse/MAPREDUCE-3289?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13423685#comment-13423685
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Siddharth Seth commented on MAPREDUCE-3289:
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The branch-1 patch looks good. Minor nit - the parameters are named differently
between branch-1 and trunk (mapred.tasktracker.shuffle.fadvise,
mapreduce.shuffle.manage.os.cache). Since this will likely go into both at the
same time, we could just use the trunk parameter names. How's this been done
for other such cases ?
> 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,
> 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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