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From "Shen Yinjie (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (MAPREDUCE-4126) This is a fix both for oracle support and managing DB splits in general.
Date Thu, 07 Jul 2016 04:15:11 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-4126?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Shen Yinjie reassigned MAPREDUCE-4126:
--------------------------------------

    Assignee: Shen Yinjie

> This is a fix both for oracle support and managing DB splits in general.
> ------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-4126
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4126
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: performance
>    Affects Versions: 1.0.0
>         Environment: Redhat 6.1 x86_64 
>            Reporter: Joseph Doss
>            Assignee: Shen Yinjie
>              Labels: hadoop, newbie, patch
>         Attachments: hadoop.dbinputformat.query.split.patch.patch
>
>
> This is and addition to an older patch that addressed oracle support. We found that in
large result sets, the map reduce was both splitting the results ( as expected ) and running
a duplicate ( full result set ) on one node, resulting in a long runtime that should have
been reduced by splitting. 



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