Package org.apache.hadoop.mapreduce.lib.reduce

Class LongSumReducer<KEY>

java.lang.Object

org.apache.hadoop.mapreduce.Reducer<KEY,LongWritable,KEY,LongWritable>

org.apache.hadoop.mapreduce.lib.reduce.LongSumReducer<KEY>

@Public
@Stable
public class LongSumReducer<KEY>
extends Reducer<KEY,LongWritable,KEY,LongWritable>

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.mapreduce.Reducer

org.apache.hadoop.mapreduce.Reducer.Context

Constructor Summary

Constructors

Constructor	Description
LongSumReducer()

Method Summary

Modifier and Type	Method	Description
void	reduce(KEY key, Iterable<LongWritable> values, Reducer<KEY,LongWritable,KEY,LongWritable>.org.apache.hadoop.mapreduce.Reducer.Context context)	This method is called once for each key.

Methods inherited from class org.apache.hadoop.mapreduce.Reducer

cleanup, run, setup

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

LongSumReducer

public LongSumReducer()

Method Details

reduce

public void reduce(KEY key,
 Iterable<LongWritable> values,
 Reducer<KEY,LongWritable,KEY,LongWritable>.org.apache.hadoop.mapreduce.Reducer.Context context)
            throws IOException,
InterruptedException

Description copied from class: Reducer

This method is called once for each key. Most applications will define their reduce class by overriding this method. The default implementation is an identity function.

Overrides:

reduce in class Reducer<KEY,LongWritable,KEY,LongWritable>

Throws:

IOException

InterruptedException