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https://issues.apache.org/jira/browse/HIVE-56?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Namit Jain resolved HIVE-56.
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Fix Version/s: 0.6.0
Resolution: Fixed
This was fixed a long time back. In hive, an empty input is created to start a
dummy mapper
> The reducer output is not created if the mapper input is empty
> --------------------------------------------------------------
>
> Key: HIVE-56
> URL: https://issues.apache.org/jira/browse/HIVE-56
> Project: Hadoop Hive
> Issue Type: Bug
> Components: Query Processor
> Reporter: Namit Jain
> Assignee: Namit Jain
> Fix For: 0.6.0
>
>
> For some Hive stuff, I ran into the following scenario:
> For a given map-reduce job, the input was empty. Because of that no mappers
> and reducers were created. It would have been helpful if an empty output for
> the reducer would have been created.
> After browsing though the code, it seems that in initTasks() in
> JobInProgress, no mappers and reducers are initialized if input is empty.
> I was thinking of putting a fix there. If the input is empty, before
> returning, create the output directory (as specified by the reducer) if
> needed.Any comments/suggestions....
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