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From "Gunther Hagleitner (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-4825) Separate MapredWork into MapWork and ReduceWork
Date Tue, 23 Jul 2013 09:26:55 GMT

     [ https://issues.apache.org/jira/browse/HIVE-4825?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gunther Hagleitner updated HIVE-4825:
-------------------------------------

    Attachment: HIVE-4825.4.patch

.4 is rebased to trunk
                
> Separate MapredWork into MapWork and ReduceWork
> -----------------------------------------------
>
>                 Key: HIVE-4825
>                 URL: https://issues.apache.org/jira/browse/HIVE-4825
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Gunther Hagleitner
>            Assignee: Gunther Hagleitner
>            Priority: Minor
>         Attachments: HIVE-4825.1.patch, HIVE-4825.2.code.patch, HIVE-4825.2.testfiles.patch,
HIVE-4825.3.testfiles.patch, HIVE-4825.4.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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