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https://issues.apache.org/jira/browse/MAPREDUCE-5478?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13748129#comment-13748129
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Sandy Ryza commented on MAPREDUCE-5478:
---------------------------------------
Verified this both on a cluster and by running TestTeraSort (with @Ignore
commented out)
> TeraInputFormat unnecessarily defines its own FileSplit subclass
> ----------------------------------------------------------------
>
> Key: MAPREDUCE-5478
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5478
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: examples
> Affects Versions: 2.1.0-beta
> Reporter: Sandy Ryza
> Assignee: Sandy Ryza
> Priority: Minor
> Attachments: MAPREDUCE-5478.patch
>
>
> TeraInputFormat defines its own TeraFileSplit subclass of FileSplit that adds
> a locations field, which is already included in FileSplit.
> This is causing MR2 TeraSort to fail on MR1, which, for a System.arraycopy,
> requires splits to be of the FileSplit class. While nobody is promising that
> everything that runs on MR2 should run on MR1, fixing this would be easy and
> make it possible to compare MR2 TeraSort performance between MR1 and MR2.
> We should just get rid of TeraFileSplit and use FileSplit.
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