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https://issues.apache.org/jira/browse/CRUNCH-22?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13419876#comment-13419876
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Josh Wills commented on CRUNCH-22:
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Textbook case of premature optimization.
> Join functions break when non-mapped types are used as a join key
> -----------------------------------------------------------------
>
> Key: CRUNCH-22
> URL: https://issues.apache.org/jira/browse/CRUNCH-22
> Project: Crunch
> Issue Type: Bug
> Reporter: Gabriel Reid
> Assignee: Gabriel Reid
> Fix For: 0.3.0
>
> Attachments: CRUNCH-22.patch
>
>
> When non-mapped types (i.e. custom Writables or Avro records) are used as a
> join key in all join functions, the join does not operate correctly (and
> becomes closer to producing a Cartesian product) due to object re-use in
> Hadoop.
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