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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-3996) Support multiple tables and scanners as input to the mapper in map/reduce jobs
Date Wed, 30 Jan 2013 07:21:15 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3996?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13566252#comment-13566252
] 

stack commented on HBASE-3996:
------------------------------

Sorry.

TableSplit is still a Writable even in trunk.  That we'll need to fix (outside scope of this
patch though)

I took a quick look over the patch.  It looks good to me.  Wholesome stuff.  [~bbaugher] Have
you used it outside of the unit test?  Does it work for you?

If so, I'm +1.
                
> Support multiple tables and scanners as input to the mapper in map/reduce jobs
> ------------------------------------------------------------------------------
>
>                 Key: HBASE-3996
>                 URL: https://issues.apache.org/jira/browse/HBASE-3996
>             Project: HBase
>          Issue Type: Improvement
>          Components: mapreduce
>            Reporter: Eran Kutner
>            Assignee: Bryan Baugher
>            Priority: Critical
>             Fix For: 0.96.0, 0.94.5
>
>         Attachments: 3996-v10.txt, 3996-v11.txt, 3996-v12.txt, 3996-v13.txt, 3996-v14.txt,
3996-v2.txt, 3996-v3.txt, 3996-v4.txt, 3996-v5.txt, 3996-v6.txt, 3996-v7.txt, 3996-v8.txt,
3996-v9.txt, HBase-3996.patch
>
>
> It seems that in many cases feeding data from multiple tables or multiple scanners on
a single table can save a lot of time when running map/reduce jobs.
> I propose a new MultiTableInputFormat class that would allow doing this.

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