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https://issues.apache.org/jira/browse/MAPREDUCE-680?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12728045#action_12728045
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Tom White commented on MAPREDUCE-680:
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+1
> Reuse of Writable objects is improperly handled by MRUnit
> ---------------------------------------------------------
>
> Key: MAPREDUCE-680
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-680
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: Aaron Kimball
> Assignee: Aaron Kimball
> Attachments: MAPREDUCE-680.patch
>
>
> As written, MRUnit's MockOutputCollector simply stores references to the
> objects passed in to its collect() method. Thus if the same Text (or other
> Writable) object is reused as an output containiner multiple times with
> different values, these separate values will not all be collected.
> MockOutputCollector needs to properly use io.serializations to deep copy the
> objects sent in.
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