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https://issues.apache.org/jira/browse/MAPREDUCE-4810?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13529009#comment-13529009
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Thomas Graves commented on MAPREDUCE-4810:
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UberAM is another example you might want different heap size. You may also just
want to specify other java options and not have to copy all the default admin
ones again too.
> Add admin command options for ApplicationMaster
> -----------------------------------------------
>
> Key: MAPREDUCE-4810
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4810
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: applicationmaster
> Affects Versions: 2.0.2-alpha, 0.23.4
> Reporter: Jason Lowe
> Priority: Minor
>
> It would be nice if the MR ApplicationMaster had the notion of admin options
> in addition to the existing user options much like we have for map and reduce
> tasks, e.g.: mapreduce.admin.map.child.java.opts vs. mapreduce.map.java.opts.
> This allows site-wide configuration options for MR AMs but still allows a
> user to easily override the heap size of the AM without worrying about
> dropping other admin-specified options.
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