[jira] [Resolved] (MAPREDUCE-3675) A job must not be submitted when there are no mappers to run

["Arun C Murthy (Resolved) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAPREDUCE-3675?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Arun C Murthy resolved MAPREDUCE-3675.
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          Resolution: Invalid
    Target Version/s: 0.23.1, 0.24.0, 1.1.0, 0.22.1  (was: 0.22.1, 1.1.0, 0.24.0, 0.23.1)

Agree with Vinod.

Oozie workflows with such jobs is a particularly important use-case for this 'feature'.
                
> 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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