Uses of Class

Packages that use MapReduceBase
org.apache.hadoop.examples Hadoop example code. 
org.apache.hadoop.examples.dancing This package is a distributed implementation of Knuth's dancing links algorithm that can run under Hadoop. 
org.apache.hadoop.examples.terasort This package consists of 3 map/reduce applications for Hadoop to compete in the annual terabyte sort competition. 
org.apache.hadoop.mapred.lib Library of generally useful mappers, reducers, and partitioners. 

Uses of MapReduceBase in org.apache.hadoop.contrib.index.mapred

Subclasses of MapReduceBase in org.apache.hadoop.contrib.index.mapred
 class IndexUpdateCombiner
          This combiner combines multiple intermediate forms into one intermediate form.
 class IndexUpdateMapper<K extends WritableComparable,V extends Writable>
          This class applies local analysis on a key-value pair and then convert the result docid-operation pair to a shard-and-intermediate form pair.
 class IndexUpdateReducer
          This reducer applies to a shard the changes for it.

Uses of MapReduceBase in org.apache.hadoop.examples

Subclasses of MapReduceBase in org.apache.hadoop.examples
static class MultiFileWordCount.MapClass
          This Mapper is similar to the one in MultiFileWordCount.MapClass.
static class PiEstimator.PiMapper
          Mapper class for Pi estimation.
static class PiEstimator.PiReducer
          Reducer class for Pi estimation.

Uses of MapReduceBase in org.apache.hadoop.examples.dancing

Subclasses of MapReduceBase in org.apache.hadoop.examples.dancing
static class DistributedPentomino.PentMap
          Each map takes a line, which represents a prefix move and finds all of the solutions that start with that prefix.

Uses of MapReduceBase in org.apache.hadoop.examples.terasort

Subclasses of MapReduceBase in org.apache.hadoop.examples.terasort
static class TeraGen.SortGenMapper
          The Mapper class that given a row number, will generate the appropriate output line.

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

Subclasses of MapReduceBase in org.apache.hadoop.mapred.lib
 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 pairs.

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