Zhijie Shen created MAPREDUCE-5281:
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Summary: Mapreduce API: Counter changes from non-abstract class to
interface
Key: MAPREDUCE-5281
URL: https://issues.apache.org/jira/browse/MAPREDUCE-5281
Project: Hadoop Map/Reduce
Issue Type: Sub-task
Reporter: Zhijie Shen
Assignee: Zhijie Shen
Therefore, significant changes in Counter:
1. Two Constructors are removed;
2. Following methods are removed:
* boolean equals(Object)
* int hashCode()
* void readFields(DataInput)
* void write(DataOutput)
Fix of this issue may break 0.23.
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