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https://issues.apache.org/jira/browse/HADOOP-3526?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12605030#action_12605030
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Chris Douglas commented on HADOOP-3526:
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Spyros-

This looks like the right idea; a couple suggestions:
* It would break less existing code if this used WritableUtils::clone instead 
of adding an abstract method
* The tag at DataJoinReducerBase::107 doesn't need to be cloned

> contrib/data_join doesn't work
> ------------------------------
>
>                 Key: HADOOP-3526
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3526
>             Project: Hadoop Core
>          Issue Type: Bug
>    Affects Versions: 0.17.0
>            Reporter: Spyros Blanas
>            Priority: Blocker
>             Fix For: 0.17.1
>
>         Attachments: datajoin-0.17.patch
>
>
> The example in the README.txt in contrig/data_join/src/example doesn't work 
> in 0.17.0. It works perfectly in 0.16.4.

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