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

Packages that use Reducer

org.apache.hadoop.mapreduce
org.apache.hadoop.mapreduce.lib.aggregate
org.apache.hadoop.mapreduce.lib.chain
org.apache.hadoop.mapreduce.lib.fieldsel
org.apache.hadoop.mapreduce.lib.reduce

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, 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.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.