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https://issues.apache.org/jira/browse/MAPREDUCE-5036?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13642375#comment-13642375
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Sandy Ryza commented on MAPREDUCE-5036:
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Submitted patch that changes the default port to 11000. The only rationale for
that over any other number was that the other mapreduce ports, job history
ports, are also in the 10000s, (19888 and 10020).
Verified that jobs still run on a single-node cluster.
> 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
> Attachments: 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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