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https://issues.apache.org/jira/browse/YARN-2078?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tsuyoshi OZAWA updated YARN-2078:
---------------------------------

    Affects Version/s: 2.4.0

> yarn.app.am.resource.mb/cpu-vcores affects uber mode but is not documented
> --------------------------------------------------------------------------
>
>                 Key: YARN-2078
>                 URL: https://issues.apache.org/jira/browse/YARN-2078
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: documentation
>    Affects Versions: 2.4.0
>            Reporter: Tsuyoshi OZAWA
>            Assignee: Tsuyoshi OZAWA
>            Priority: Trivial
>         Attachments: YARN-2078.1.patch
>
>
> We should document the condition when uber mode is enabled. If not, users 
> need to read code.
> {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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