| Package | Description | 
|---|---|
| org.apache.hadoop.mapred.lib.aggregate | |
| org.apache.hadoop.mapreduce.lib.aggregate | 
| Class and Description | 
|---|
| DoubleValueSum This class implements a value aggregator that sums up a sequence of double
 values. | 
| LongValueMax This class implements a value aggregator that maintain the maximum of 
 a sequence of long values. | 
| LongValueMin This class implements a value aggregator that maintain the minimum of 
 a sequence of long values. | 
| LongValueSum This class implements a value aggregator that sums up 
 a sequence of long values. | 
| StringValueMax This class implements a value aggregator that maintain the biggest of 
 a sequence of strings. | 
| StringValueMin This class implements a value aggregator that maintain the smallest of 
 a sequence of strings. | 
| UniqValueCount This class implements a value aggregator that dedupes a sequence of objects. | 
| UserDefinedValueAggregatorDescriptor This class implements a wrapper for a user defined value 
 aggregator descriptor. | 
| ValueAggregator This interface defines the minimal protocol for value aggregators. | 
| ValueAggregatorBaseDescriptor This class implements the common functionalities of 
 the subclasses of ValueAggregatorDescriptor class. | 
| ValueAggregatorDescriptor This interface defines the contract a value aggregator descriptor must
 support. | 
| ValueHistogram This class implements a value aggregator that computes the 
 histogram of a sequence of strings. | 
| 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. | 
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