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https://issues.apache.org/jira/browse/HBASE-3996?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13050627#comment-13050627
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stack commented on HBASE-3996:
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Its a new feature so it'll go into TRUNK not on to 0.90. Thats how we
generally do it. I'd guess that branch patch will probably apply clean to
trunk since its all new files anyways.
> 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: 0.90.4
>
> Attachments: MultiTableInputCollection.java,
> MultiTableInputFormat.java, MultiTableInputFormatBase.java,
> TableMapReduceUtil.java, TableSplit.java
>
>
> 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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