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https://issues.apache.org/jira/browse/MAPREDUCE-5036?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13678173#comment-13678173
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Vinod Kumar Vavilapalli commented on MAPREDUCE-5036:
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Sure, don't have issues leaving it around - may be useful in some cases. But
the default can and should simply be zero.
> Default shuffle handler port should not be 8080
> -----------------------------------------------
>
> Key: MAPREDUCE-5036
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5036
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Affects Versions: 2.0.3-alpha
> Reporter: Sandy Ryza
> Assignee: Sandy Ryza
> Fix For: 2.1.0-beta
>
> Attachments: MAPREDUCE-5036-13562.patch, MAPREDUCE-5036.patch
>
>
> The shuffle handler port (mapreduce.shuffle.port) defaults to 8080. This is
> a pretty common port for web services, and is likely to cause unnecessary
> port conflicts.
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