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

Packages that use Reducer

org.apache.hadoop.examples	Hadoop example code.
org.apache.hadoop.mapred	A software framework for easily writing applications which process vast amounts of data (multi-terabyte data-sets) parallelly on large clusters (thousands of nodes) built of commodity hardware in a reliable, fault-tolerant manner.
org.apache.hadoop.mapreduce
org.apache.hadoop.mapreduce.lib.fieldsel
org.apache.hadoop.mapreduce.lib.reduce

Uses of Reducer in org.apache.hadoop.examples

Subclasses of Reducer in org.apache.hadoop.examples

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.mapred

Methods in org.apache.hadoop.mapred with parameters of type Reducer

protected static <INKEY,INVALUE,OUTKEY,OUTVALUE> Reducer.Context

Task.createReduceContext(Reducer<INKEY,INVALUE,OUTKEY,OUTVALUE> reducer, Configuration job, TaskAttemptID taskId, RawKeyValueIterator rIter, Counter inputKeyCounter, Counter inputValueCounter, RecordWriter<OUTKEY,OUTVALUE> output, OutputCommitter committer, StatusReporter reporter, RawComparator<INKEY> comparator, Class<INKEY> keyClass, Class<INVALUE> valueClass)

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.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>