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From "Dan Harvey (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-2546) MRunit ReduceDriver does not fully replicate the reducers behaviour with reusing pointers over the iterator
Date Mon, 30 May 2011 17:16:47 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2546?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13041203#comment-13041203
] 

Dan Harvey commented on MAPREDUCE-2546:
---------------------------------------

This was discussed in the mailing lists last year

http://mail-archives.apache.org/mod_mbox/hadoop-mapreduce-user/201012.mbox/%3CAANLkTinMDb9NLkNXYQg=8=aFBbQt7GNuZoVpk8+avcqj@mail.gmail.com%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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