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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-2740) MultipleOutputs in new API creates needless TaskAttemptContexts
Date Thu, 28 Jul 2011 20:40:09 GMT
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
             Fix For: 0.23.0


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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