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https://issues.apache.org/jira/browse/OOZIE-1335?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13656411#comment-13656411
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Rohini Palaniswamy commented on OOZIE-1335:
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[~rkanter],
There is something we missed. We need to adjust the AM container size. If
user has set oozie.launcher.mapred.child.java.opts (or map specific java opts
setting of 1.x and 2.x), and oozie.launcher.mapred.job.map.memory.mb (or the
equivalent 2.x setting), we need to up the AM size in uber mode to those
values. If this is not done automatically, jobs that were running before will
fail. Pig jobs usually need 1G or more to run.
> The launcher job should use uber mode in Hadoop 2 by default
> ------------------------------------------------------------
>
> Key: OOZIE-1335
> URL: https://issues.apache.org/jira/browse/OOZIE-1335
> Project: Oozie
> Issue Type: Bug
> Affects Versions: trunk
> Reporter: Robert Kanter
> Assignee: Robert Kanter
> Fix For: trunk
>
> Attachments: OOZIE-1335.patch, OOZIE-1335.patch, OOZIE-1335.patch
>
>
> In theory, running the launcher job in Hadoop 2's uber mode should make the
> overall action time faster because we don't need to launch as many JVMs.
> I tested this out on a few of the examples in a VM, and it seems to save
> about 10 - 50 seconds per action. While my testing wasn't scientific and was
> only on a single VM, setting the launcher job to run in uber mode by default
> is such a trivial change and should at least not make it slower that I think
> we should do it.
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