[jira] [Commented] (HBASE-3996) Support multiple tables and scanners as input to the mapper in map/reduce jobs

["Eran Kutner (Commented) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-3996?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13247444#comment-13247444 ] 

Eran Kutner commented on HBASE-3996:
------------------------------------

@stack: I believe the only open issue in the review board is your suggestion to replace my MultiTableInputCollection with a List<Scan>. Although I agree it would make the patch simpler and allow it to have one less class, I think it will make using it less natural. Developers will have to create a Scan which is a common object and then set a table attribute. This feels less natural to me than setting the table by adding to a collection the way I've done it, but I guess it's a matter of perspective.

                
> 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: Eran Kutner
>             Fix For: 0.96.0
>
>         Attachments: 3996-v2.txt, 3996-v3.txt, 3996-v4.txt, 3996-v5.txt, 3996-v6.txt, 3996-v7.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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