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https://issues.apache.org/jira/browse/MRUNIT-157?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14739079#comment-14739079
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Brock Noland commented on MRUNIT-157:
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Yep NullWritable.get() is the correct method.
> allow null keys and values as output, expected output
> -----------------------------------------------------
>
> Key: MRUNIT-157
> URL: https://issues.apache.org/jira/browse/MRUNIT-157
> Project: MRUnit
> Issue Type: Bug
> Affects Versions: 0.9.0
> Reporter: Carlos Espinoza
> Assignee: Jim Donofrio
> Priority: Critical
> Fix For: 1.2.0
>
>
> from comments at the end of MRUNIT-66:
> Hadoop allows null keys and values, when not used as intermediate keys,values
> between mappers and reducers. MRUnit should also allow allow null keys and
> values as output and expected output. The Serialization class will need to be
> modified to not try to copy null's into the output, expected output
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