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https://issues.apache.org/jira/browse/MRUNIT-216?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14237484#comment-14237484
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Brock Noland commented on MRUNIT-216:
-------------------------------------
Can you submit a test which reproduces this?
> MR Unit's call to key grouping comparator passes different data than Hadoop
> ---------------------------------------------------------------------------
>
> Key: MRUNIT-216
> URL: https://issues.apache.org/jira/browse/MRUNIT-216
> Project: MRUnit
> Issue Type: Bug
> Affects Versions: 1.1.0
> Reporter: Sam Meder
>
> I'm packing a composite key into a BytesWritable and am combining this with a
> grouping comparator and am finding that the bytes passed to the comparator
> are different in MRUnit vs on a real Hadoop cluster. On the hadoop cluster I
> am having to do things similar to the following comparator code from
> BytesWritable:
> return compareBytes(b1, s1+LENGTH_BYTES, l1-LENGTH_BYTES,
> b2, s2+LENGTH_BYTES, l2-LENGTH_BYTES);
> i.e. need to strip some length bytes that are being passed along. In the mr
> unit test on the other hand those bytes don't seemed to be passed to the
> comparator...
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