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https://issues.apache.org/jira/browse/MAPREDUCE-2546?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13041203#comment-13041203
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Dan Harvey commented on MAPREDUCE-2546:
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This was discussed in the mailing lists last year
http://mail-archives.apache.org/mod_mbox/hadoop-mapreduce-user/201012.mbox/%[email protected]%3E
We've got code for this we will clean up and submit as a patch as soon as we
can.
> MRunit ReduceDriver does not fully replicate the reducers behaviour with
> reusing pointers over the iterator
> -----------------------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-2546
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2546
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: contrib/mrunit
> Affects Versions: 0.20.1, 0.20.2, 0.21.0
> Reporter: Dan Harvey
> Priority: Minor
>
> The MRunit ReduceDriver does not replicate the behaviour of re-using the
> pointer to the returned values as they are iterated over. This is a problem
> for testing as it does not fail when you are incorrectly storing this pointer
> for a value if you want to use it later on in the iteration over the values.
> The behaviour should be modified so the iterator will return the same pointer
> every time.
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