Uses of Class
org.apache.hadoop.mapreduce.Reducer

Packages that use Reducer
org.apache.hadoop.examples Hadoop example code. 
org.apache.hadoop.examples.pi This package consists of a map/reduce application, distbbp, which computes exact binary digits of the mathematical constant π. 
org.apache.hadoop.mapreduce   
org.apache.hadoop.mapreduce.lib.aggregate Classes for performing various counting and aggregations. 
org.apache.hadoop.mapreduce.lib.chain   
org.apache.hadoop.mapreduce.lib.fieldsel   
org.apache.hadoop.mapreduce.lib.map   
org.apache.hadoop.mapreduce.lib.reduce   
 

Uses of Reducer in org.apache.hadoop.examples
 

Subclasses of Reducer in org.apache.hadoop.examples
static class BaileyBorweinPlouffe.BbpReducer
          Reducer for concatenating map outputs.
static class QuasiMonteCarlo.QmcReducer
          Reducer class for Pi estimation.
static class SecondarySort.Reduce
          A reducer class that just emits the sum of the input values.
static class WordCount.IntSumReducer
           
 

Uses of Reducer in org.apache.hadoop.examples.pi
 

Subclasses of Reducer in org.apache.hadoop.examples.pi
static class DistSum.ReduceSide.SummingReducer
          A Reducer which computes sums
 

Uses of Reducer in org.apache.hadoop.mapreduce
 

Methods in org.apache.hadoop.mapreduce that return types with arguments of type Reducer
 Class<? extends Reducer<?,?,?,?>> JobContext.getCombinerClass()
          Get the combiner class for the job.
 Class<? extends Reducer<?,?,?,?>> JobContext.getReducerClass()
          Get the Reducer class for the job.
 

Method parameters in org.apache.hadoop.mapreduce with type arguments of type Reducer
 void Job.setCombinerClass(Class<? extends Reducer> cls)
          Set the combiner class for the job.
 void Job.setReducerClass(Class<? extends Reducer> cls)
          Set the Reducer for the job.
 

Uses of Reducer in org.apache.hadoop.mapreduce.lib.aggregate
 

Subclasses of Reducer in org.apache.hadoop.mapreduce.lib.aggregate
 class ValueAggregatorCombiner<K1 extends WritableComparable<?>,V1 extends Writable>
          This class implements the generic combiner of Aggregate.
 class ValueAggregatorReducer<K1 extends WritableComparable<?>,V1 extends Writable>
          This class implements the generic reducer of Aggregate.
 

Uses of Reducer in org.apache.hadoop.mapreduce.lib.chain
 

Subclasses of Reducer in org.apache.hadoop.mapreduce.lib.chain
 class ChainReducer<KEYIN,VALUEIN,KEYOUT,VALUEOUT>
          The ChainReducer class allows to chain multiple Mapper classes after a Reducer within the Reducer task.
 

Method parameters in org.apache.hadoop.mapreduce.lib.chain with type arguments of type Reducer
static void ChainReducer.setReducer(Job job, Class<? extends Reducer> klass, Class<?> inputKeyClass, Class<?> inputValueClass, Class<?> outputKeyClass, Class<?> outputValueClass, org.apache.hadoop.conf.Configuration reducerConf)
          Sets the Reducer class to the chain job.
 

Uses of Reducer in org.apache.hadoop.mapreduce.lib.fieldsel
 

Subclasses of Reducer in org.apache.hadoop.mapreduce.lib.fieldsel
 class FieldSelectionReducer<K,V>
          This class implements a reducer class that can be used to perform field selections in a manner similar to unix cut.
 

Uses of Reducer in org.apache.hadoop.mapreduce.lib.map
 

Methods in org.apache.hadoop.mapreduce.lib.map that return types with arguments of type Reducer
 Class<? extends Reducer<?,?,?,?>> WrappedMapper.Context.getCombinerClass()
           
 Class<? extends Reducer<?,?,?,?>> WrappedMapper.Context.getReducerClass()
           
 

Uses of Reducer in org.apache.hadoop.mapreduce.lib.reduce
 

Subclasses of Reducer in org.apache.hadoop.mapreduce.lib.reduce
 class IntSumReducer<Key>
           
 class LongSumReducer<KEY>
           
 class WrappedReducer<KEYIN,VALUEIN,KEYOUT,VALUEOUT>
          A Reducer which wraps a given one to allow for custom WrappedReducer.Context implementations.
 

Methods in org.apache.hadoop.mapreduce.lib.reduce that return types with arguments of type Reducer
 Class<? extends Reducer<?,?,?,?>> WrappedReducer.Context.getCombinerClass()
           
 Class<? extends Reducer<?,?,?,?>> WrappedReducer.Context.getReducerClass()
           
 



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