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Posted to mapreduce-issues@hadoop.apache.org by "Dan Harvey (JIRA)" <ji...@apache.org> on 2011/05/30 19:14:47 UTC
[jira] [Created] (MAPREDUCE-2546) MRunit ReduceDriver does not
fully replicate the reducers behaviour with reusing pointers over the
iterator
MRunit ReduceDriver does not fully replicate the reducers behaviour with reusing pointers over the iterator
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Key: MAPREDUCE-2546
URL: https://issues.apache.org/jira/browse/MAPREDUCE-2546
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: contrib/mrunit
Affects Versions: 0.21.0, 0.20.2, 0.20.1
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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[jira] [Commented] (MAPREDUCE-2546) MRunit ReduceDriver does not
fully replicate the reducers behaviour with reusing pointers over the
iterator
Posted by "Dan Harvey (JIRA)" <ji...@apache.org>.
[ 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:
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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/%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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