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https://issues.apache.org/jira/browse/HIVE-4825?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13702664#comment-13702664
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Gunther Hagleitner commented on HIVE-4825:
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Initial draft: https://reviews.facebook.net/D11631
> Separate MapredWork into MapWork and ReduceWork
> -----------------------------------------------
>
> Key: HIVE-4825
> URL: https://issues.apache.org/jira/browse/HIVE-4825
> Project: Hive
> Issue Type: Bug
> Reporter: Gunther Hagleitner
> Assignee: Gunther Hagleitner
> Attachments: HIVE-4825.1.patch
>
>
> Right now all the information needed to run an MR job is captured in
> MapredWork. This class has aliases, tagging info, table descriptors etc.
> For Tez and MRR it will be useful to break this into map and reduce specific
> pieces. The separation is natural and I think has value in itself, it makes
> the code easier to understand. However, it will also allow us to reuse these
> abstractions in Tez where you'll have a graph of these instead of just 1M and
> 0-1R.
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