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https://issues.apache.org/jira/browse/MAPREDUCE-2740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13073629#comment-13073629
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Todd Lipcon commented on MAPREDUCE-2740:
----------------------------------------
I ran TestMultipleOutputs and TestMRMultipleOutputs and they pass. Those are
the only tests which reference the changed code. I'll commit this to trunk
momentarily
> MultipleOutputs in new API creates needless TaskAttemptContexts
> ---------------------------------------------------------------
>
> Key: MAPREDUCE-2740
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2740
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 0.23.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Fix For: 0.23.0
>
> Attachments: mr-2740.txt
>
>
> MultipleOutputs.write creates a new TaskAttemptContext, which we've seen to
> take a significant amount of CPU. The TaskAttemptContext constructor creates
> a JobConf, gets current UGI, etc. I don't see any reason it needs to do this,
> instead of just creating a single TaskAttemptContext when the InputFormat is
> created (or lazily but cached as a member)
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