Package org.apache.hadoop.examples

Class BaileyBorweinPlouffe.BbpReducer

java.lang.Object

org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.BytesWritable,org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.BytesWritable>

org.apache.hadoop.examples.BaileyBorweinPlouffe.BbpReducer

Enclosing class:

BaileyBorweinPlouffe

public static class BaileyBorweinPlouffe.BbpReducer
extends org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.BytesWritable,org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.BytesWritable>

Reducer for concatenating map outputs.

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
BbpReducer()

Method Summary

Modifier and Type	Method	Description
protected void	cleanup(org.apache.hadoop.mapreduce.Reducer.Context context)	Write output to files.
protected void	reduce(org.apache.hadoop.io.LongWritable offset, java.lang.Iterable<org.apache.hadoop.io.BytesWritable> values, org.apache.hadoop.mapreduce.Reducer.Context context)	Concatenate map outputs.

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

run, setup

Methods inherited from class java.lang.Object

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

Constructor Detail

BbpReducer

public BbpReducer()

Method Detail

reduce

protected void reduce(org.apache.hadoop.io.LongWritable offset,
                      java.lang.Iterable<org.apache.hadoop.io.BytesWritable> values,
                      org.apache.hadoop.mapreduce.Reducer.Context context)
               throws java.io.IOException,
                      java.lang.InterruptedException

Concatenate map outputs.

Overrides:

reduce in class org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.BytesWritable,org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.BytesWritable>

Throws:

java.io.IOException

java.lang.InterruptedException

cleanup

protected void cleanup(org.apache.hadoop.mapreduce.Reducer.Context context)
                throws java.io.IOException,
                       java.lang.InterruptedException

Write output to files.

Overrides:

cleanup in class org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.BytesWritable,org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.BytesWritable>

Throws:

java.io.IOException

java.lang.InterruptedException