Uses of Interface
org.apache.hadoop.mapred.Reducer

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

Uses of Reducer in org.apache.hadoop.examples
 

Classes in org.apache.hadoop.examples that implement Reducer
 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 WordCount.Reduce
          A reducer class that just emits the sum of the input values.
 

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

Classes in org.apache.hadoop.mapred.lib that implement Reducer
 class IdentityReducer
          Performs no reduction, writing all input values directly to the output.
 class LongSumReducer
          A Reducer that sums long values.
 

Uses of Reducer in org.apache.hadoop.util
 

Classes in org.apache.hadoop.util that implement Reducer
 class CopyFiles
          A Map-reduce program to recursively copy directories between diffferent file-systems.
 



Copyright © 2006 The Apache Software Foundation