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https://issues.apache.org/jira/browse/HBASE-3996?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13569192#comment-13569192
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Lars Hofhansl commented on HBASE-3996:
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OK... I won't be able to.
I'd say we commit this.
It is mostly new code and it is widely requested feature. If we find bugs we
weed them out as we find them. Thoughts?
(We'll be using/testing this at Salesforce as we go further down the
backup/restore path for multiple tables)
> 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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