datafu.hourglass.mapreduce

Class DelegatingCombiner

java.lang.Object

org.apache.hadoop.mapreduce.Reducer<java.lang.Object,java.lang.Object,java.lang.Object,java.lang.Object>

datafu.hourglass.mapreduce.DelegatingCombiner

public class DelegatingCombiner
extends org.apache.hadoop.mapreduce.Reducer<java.lang.Object,java.lang.Object,java.lang.Object,java.lang.Object>

A Hadoop combiner which delegates to an implementation read from the distributed cache.

Nested Class Summary

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

org.apache.hadoop.mapreduce.Reducer.Context

Constructor Summary

Constructors

Constructor and Description
DelegatingCombiner()

Method Summary

Methods

Modifier and Type	Method and Description
protected void	cleanup(org.apache.hadoop.mapreduce.Reducer.Context context)
protected void	reduce(java.lang.Object key, java.lang.Iterable<java.lang.Object> values, org.apache.hadoop.mapreduce.Reducer.Context context)
protected void	setup(org.apache.hadoop.mapreduce.Reducer.Context context)

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

run

Methods inherited from class java.lang.Object

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

Constructor Detail

DelegatingCombiner

public DelegatingCombiner()

Method Detail

setup

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

Overrides:

setup in class org.apache.hadoop.mapreduce.Reducer<java.lang.Object,java.lang.Object,java.lang.Object,java.lang.Object>

Throws:

java.io.IOException

java.lang.InterruptedException

reduce

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

Overrides:

reduce in class org.apache.hadoop.mapreduce.Reducer<java.lang.Object,java.lang.Object,java.lang.Object,java.lang.Object>

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

Overrides:

cleanup in class org.apache.hadoop.mapreduce.Reducer<java.lang.Object,java.lang.Object,java.lang.Object,java.lang.Object>

Throws:

java.io.IOException

java.lang.InterruptedException