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

Packages that use Reducer
org.apache.hadoop.abacus Hadoop based Abacus is a specialization of map/reduce framework, specilizing for performing various counting and aggregations. 
org.apache.hadoop.benchmarks.mapred   
org.apache.hadoop.examples Hadoop example code. 
org.apache.hadoop.mapred.lib Library of generally useful mappers, reducers, and partitioners. 
org.apache.hadoop.streaming   
 

Uses of Reducer in org.apache.hadoop.abacus
 

Classes in org.apache.hadoop.abacus that implement Reducer
 class JobBase
          A common base implementing some statics collecting mechanisms that are commonly used in a typical map/reduce job.
 class ValueAggregatorCombiner
          This class implements the generic combiner of Abacus.
 class ValueAggregatorJobBase
          This abstract class implements some common functionalities of the the generic mapper, reducer and combiner classes of Abacus.
 class ValueAggregatorMapper
          This class implements the generic mapper of Abacus.
 class ValueAggregatorReducer
          This class implements the generic reducer of Abacus.
 

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

Classes in org.apache.hadoop.benchmarks.mapred that implement Reducer
 class BenchmarkReducer
           
 

Uses of Reducer in org.apache.hadoop.examples
 

Classes in org.apache.hadoop.examples that implement Reducer
static class PiEstimator.PiReducer
           
 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.streaming
 

Classes in org.apache.hadoop.streaming that implement Reducer
 class PipeCombiner
          A generic Combiner bridge.
To use a Combiner specify -combiner myprogram in hadoopStreaming.
 class PipeReducer
          A generic Reducer bridge.
 



Copyright © 2006 The Apache Software Foundation