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https://issues.apache.org/jira/browse/MRUNIT-127?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13426558#comment-13426558
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Brock Noland commented on MRUNIT-127:
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Is this true even if you add a custom sorting comparator to your driver?
> Key grouping with GroupingComparators is not consistent with MapReduce
> behaviour
> --------------------------------------------------------------------------------
>
> Key: MRUNIT-127
> URL: https://issues.apache.org/jira/browse/MRUNIT-127
> Project: MRUnit
> Issue Type: Bug
> Affects Versions: 0.9.0
> Reporter: Dave Beech
>
> In Hadoop MapReduce, for a set of keys to be properly grouped together by a
> grouping comparator into a reduce call, they need to be in a contiguous range
> when sorted by the key's ordering comparator.
> MRUnit does not impose this requirement, so if the user's grouping and
> sorting comparator logic is incorrect, their tests may pass and give the
> expected result even though the outcome would be different when run as a true
> MapReduce job.
> (see below for further explanation)
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