Create a compatible interface for frameworks that need to clone MapReduce
context objects.
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Key: MAPREDUCE-2506
URL: https://issues.apache.org/jira/browse/MAPREDUCE-2506
Project: Hadoop Map/Reduce
Issue Type: Improvement
Reporter: Owen O'Malley
In 0.21 we moved the org.apache.hadoop.mapreduce context objects to interfaces.
That made the APIs much better, but broke backwards compatibility for
frameworks that need to clone them.
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