## Uses of Class
org.apache.hadoop.mapred.MapReduceBase

- Packages that use MapReduceBase
  Package | Description
  --- | ---
  org.apache.hadoop.mapred.lib |

- - ### Uses of MapReduceBase in org.apache.hadoop.mapred.lib

    Subclasses of MapReduceBase in 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 `Mapper` that swaps keys and values.
    `class` | `LongSumReducer<K>` A `Reducer` that sums long values.
    `class` | `RegexMapper<K>` A `Mapper` that extracts text matching a regular expression.
    `class` | `TokenCountMapper<K>` A `Mapper` that maps text values into <token,freq> pairs.

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