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. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira