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https://issues.apache.org/jira/browse/MAPREDUCE-5036?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13646699#comment-13646699
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Arpit Gupta commented on MAPREDUCE-5036:
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we might want to pick a different default since oozie console also uses port 
11000
                
> 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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