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From "Johannes Zillmann (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-2042) InputFormat#getSplits() is called twice in local mode
Date Sat, 28 Aug 2010 21:08:53 GMT
InputFormat#getSplits() is called twice in local mode
-----------------------------------------------------

                 Key: MAPREDUCE-2042
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2042
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: job submission
    Affects Versions: 0.20.2, 0.20.1
            Reporter: Johannes Zillmann
             Fix For: 0.20.3


In local mode the InputFormat#getSplits() is called twice in local mode.
- 1st time: JobClient#writeOld/NewSplits() (then they write the splits to disk )
- 2nd time: LocalJobRunner#run() (instead of reading the split file )

That can become annoying in case the InputFormat access external resources or takes a little
longer to create the splits.


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