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From "Zhihong Yu (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-3996) Support multiple tables and scanners as input to the mapper in map/reduce jobs
Date Mon, 19 Mar 2012 02:26:37 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3996?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13232416#comment-13232416
] 

Zhihong Yu commented on HBASE-3996:
-----------------------------------

@Eran:
There was unnecessary formatting in your patch:
{code}
+     if (jars.isEmpty())
+       return;
{code}
The convention is to put 'return' on the same line or use curly braces otherwise.
                
> 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
>             Fix For: 0.94.0
>
>         Attachments: 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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