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Posted to mapreduce-dev@hadoop.apache.org by "Aaron Kimball (JIRA)" <ji...@apache.org> on 2009/06/30 04:12:47 UTC

[jira] Created: (MAPREDUCE-680) Reuse of Writable objects is improperly handled by MRUnit

Reuse of Writable objects is improperly handled by MRUnit
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                 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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