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https://issues.apache.org/jira/browse/MAPREDUCE-2750?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13072876#comment-13072876
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Allen Wittenauer commented on MAPREDUCE-2750:
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Is there a reason someone would want to run multiple NodeManagers on a single
host in a production environment? Hadoop has way too many ephemeral ports as
it is....
> [MR-279] NodeManager should start its servers on ephemeral ports
> -----------------------------------------------------------------
>
> Key: MAPREDUCE-2750
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2750
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2
> Affects Versions: 0.23.0
> Reporter: Vinod Kumar Vavilapalli
> Fix For: 0.23.0
>
>
> There is absolutely no need for NM to start ContainerManager on a standard
> port, it should bind to an ephemeral port. Binding on ephemeral ports will
> help us start multiple NMs on a single node without any issues.
> The same holds for the ResourceLocalizationService's server port and NM Http
> server's port.
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