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https://issues.apache.org/jira/browse/MAPREDUCE-6070?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14129600#comment-14129600
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Tsuyoshi OZAWA commented on MAPREDUCE-6070:
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[~jlowe], could you check when you have time?
> yarn.app.am.resource.mb/cpu-vcores affects uber mode but is not documented
> --------------------------------------------------------------------------
>
> Key: MAPREDUCE-6070
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6070
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: documentation
> Affects Versions: 2.4.0, 2.5.0
> Reporter: Tsuyoshi OZAWA
> Assignee: Tsuyoshi OZAWA
> Priority: Trivial
> Attachments: MAPREDUCE-6070.2.patch, YARN-2078.1.patch
>
>
> We should document the condition when uber mode is enabled. Currently, users
> need to read following code to understand the condition.
> {code}
> boolean smallMemory =
> ( (Math.max(conf.getLong(MRJobConfig.MAP_MEMORY_MB, 0),
> conf.getLong(MRJobConfig.REDUCE_MEMORY_MB, 0))
> <= sysMemSizeForUberSlot)
> || (sysMemSizeForUberSlot == JobConf.DISABLED_MEMORY_LIMIT));
> boolean smallCpu =
> Math.max(
> conf.getInt(
> MRJobConfig.MAP_CPU_VCORES,
> MRJobConfig.DEFAULT_MAP_CPU_VCORES),
> conf.getInt(
> MRJobConfig.REDUCE_CPU_VCORES,
> MRJobConfig.DEFAULT_REDUCE_CPU_VCORES))
> <= sysCPUSizeForUberSlot
> {code}
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