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https://issues.apache.org/jira/browse/MAPREDUCE-6118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14157635#comment-14157635
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Maysam Yabandeh commented on MAPREDUCE-6118:
--------------------------------------------
not every detail is covered in examples. it is there just to communicate the
idea.
> Uber-mode decision does not consider -Xmx
> -----------------------------------------
>
> Key: MAPREDUCE-6118
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6118
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: Maysam Yabandeh
> Priority: Minor
>
> Current the decision on using uber-mode is based on the mapper container size
> and the AM container size. However the actual memory at AM is limited by -Xmx
> options passed via yarn.app.mapreduce.am.command-opts.
> For example: AM memory: 4G, yarn.app.mapreduce.am.command-opts=-Xmx2048GB,
> mapper memory: 3GB. Here the uber job could face OOM whereas a non-uber
> execution would not.
> We faced this problem recently and forced to disable uber-mode to circumvent
> the problem. One idea, although a bit ugly, is to parse jvm opts, extract
> Xmx, and take it into account for uber-mode decision.
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