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

Packages that use MapReduceBase
org.apache.hadoop.examples Hadoop example code. 
org.apache.hadoop.mapred.lib Library of generally useful mappers, reducers, and partitioners. 
 

Uses of MapReduceBase in org.apache.hadoop.examples
 

Subclasses of MapReduceBase in org.apache.hadoop.examples
 class RandomWriter
          This program uses map/reduce to just run a distributed job where there is no interaction between the tasks and each task write a large unsorted random binary sequence file of BytesWritable.
static class RandomWriter.Map
           
static class WordCount.MapClass
          Counts the words in each line.
static class WordCount.Reduce
          A reducer class that just emits the sum of the input values.
 

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

Subclasses of MapReduceBase in org.apache.hadoop.mapred.lib
 class IdentityMapper
          Implements the identity function, mapping inputs directly to outputs.
 class IdentityReducer
          Performs no reduction, writing all input values directly to the output.
 class InverseMapper
          A Mapper that swaps keys and values.
 class LongSumReducer
          A Reducer that sums long values.
 class RegexMapper
          A Mapper that extracts text matching a regular expression.
 class TokenCountMapper
          A Mapper that maps text values into pairs.
 



Copyright © 2006 The Apache Software Foundation