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From "Namit Jain (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HIVE-56) The reducer output is not created if the mapper input is empty
Date Wed, 23 Jun 2010 21:13:50 GMT

     [ https://issues.apache.org/jira/browse/HIVE-56?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Namit Jain resolved HIVE-56.

    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
> 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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