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https://issues.apache.org/jira/browse/MAPREDUCE-5417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13719008#comment-13719008
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Karthik Kambatla commented on MAPREDUCE-5417:
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When the settings for map/reduce tasks conflict, it should be okay to set to
the maximum value.
> Propagate task settings to AM when job runs in uber mode
> --------------------------------------------------------
>
> Key: MAPREDUCE-5417
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5417
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: mrv2
> Affects Versions: 2.0.4-alpha
> Reporter: Jason Lowe
>
> When a job runs in Uber-AM mode the JVM settings (e.g.: heap sizing),
> container sizing, and environment variables are not propagated to the AM.
> This means running in uber-AM mode is not as simple as enabling
> {{mapreduce.job.ubertask.enable}} since lack of proper heap/container
> settings can doom the AM to crash or lack of proper environment variables can
> prevent the task code from properly running.
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