Zhijie Shen created MAPREDUCE-5284:
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Summary: Mapreduce API: CounterGroup changes from non-abstract
class to interface
Key: MAPREDUCE-5284
URL: https://issues.apache.org/jira/browse/MAPREDUCE-5284
Project: Hadoop Map/Reduce
Issue Type: Sub-task
Reporter: Zhijie Shen
Assignee: Zhijie Shen
Therefore, constructors and implemented methods are removed.
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