A job must not be submitted when there are no mappers to run
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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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