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From "Harsh J (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-3675) A job must not be submitted when there are no mappers to run
Date Mon, 16 Jan 2012 08:24:39 GMT
A job must not be submitted when there are no mappers to run
------------------------------------------------------------

                 Key: MAPREDUCE-3675
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3675
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: client
    Affects Versions: 1.0.0
            Reporter: Harsh J
            Priority: Minor


Right now, one's able to run a job with an empty input directory and a job is indeed scheduled.

The job runs no mappers, but any number of specified reducers are run anyway as dummy tasks.

This should be/could be avoided. I do not see a use for such an allowance, and it looks mostly
like a logic slip to me with empty arrays involved and accepted.

The fix could be simply in the job submission code, where we can avoid submitting if the splits
are nil.

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