| Package | Description | 
|---|---|
| org.apache.hadoop.mapred.lib | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | IdentityMapper<K,V>Implements the identity function, mapping inputs directly to outputs. | 
| class  | IdentityReducer<K,V>Performs no reduction, writing all input values directly to the output. | 
| class  | InverseMapper<K,V>A  Mapperthat swaps keys and values. | 
| class  | LongSumReducer<K>A  Reducerthat sums long values. | 
| class  | RegexMapper<K>A  Mapperthat extracts text matching a regular expression. | 
| class  | TokenCountMapper<K>A  Mapperthat maps text values into <token,freq> pairs. | 
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