| Package | Description | 
|---|---|
| org.apache.hadoop.mapred.lib.aggregate | 
| Class and Description | 
|---|
| ValueAggregator This interface defines the minimal protocol for value aggregators. | 
| ValueAggregatorDescriptor This interface defines the contract a value aggregator descriptor must
 support. | 
| ValueAggregatorJobBase This abstract class implements some common functionalities of the
 the generic mapper, reducer and combiner classes of Aggregate. | 
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