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https://issues.apache.org/jira/browse/MAPREDUCE-5653?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13832763#comment-13832763
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Jason Lowe commented on MAPREDUCE-5653:
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Thinking about this further, I see why addDefaultResource() will not work.
distcp-default.xml and mapred-site.xml will often overlap, and it's likely
mapred-site.xml will be loaded first then distcp-default.xml will later stomp
any overlapping values when it's loaded.
So I'd like to see a comment for the property iteration loop explaining why we
can't use addDefaultResource. Also a unit test would be nice to verify it's
working as-intended.
> DistCp does not honour config-overrides for mapreduce.[map,reduce].memory.mb
> ----------------------------------------------------------------------------
>
> Key: MAPREDUCE-5653
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5653
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: distcp
> Affects Versions: trunk, 0.23.9, 2.2.0
> Reporter: Mithun Radhakrishnan
> Assignee: Mithun Radhakrishnan
> Attachments: MAPREDUCE-5653.branch-0.23.patch,
> MAPREDUCE-5653.branch-2.patch, MAPREDUCE-5653.trunk.patch
>
>
> When a DistCp job is run through Oozie (through a Java action that launches
> DistCp), one sees that mapred.child.java.opts as set from the caller is
> honoured by DistCp. But, DistCp doesn't seem to honour any overrides for
> configs mapreduce.[map,reduce].memory.mb.
> Problem has been identified. I'll post a patch shortly.
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