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https://issues.apache.org/jira/browse/MAPREDUCE-5036?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13588778#comment-13588778
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Sandy Ryza commented on MAPREDUCE-5036:
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Didn't mean to imply that it's not a web service. Just that the nice thing
about 8080 is that it's pretty easy for humans to remember, and thus a common
place for apps to expose debug UIs and such. Since the shuffle handler port
isn't really one that humans need to be visiting, and is one that other
services are likely to use, it seems better to me not to use it.
We came across this when it had a conflict with Sqoop using the same port for
something. Sqoop is going to move off of it as well.
> 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
>
> The shuffle handler 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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