org.kepler.hadoop.mapreduce

Class Reducer4CoGroup

java.lang.Object

org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.WritableComparable,TaggedValue,org.apache.hadoop.io.WritableComparable,org.apache.hadoop.io.Writable>

org.kepler.hadoop.mapreduce.Reducer4CoGroup

public class Reducer4CoGroup
extends org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.WritableComparable,TaggedValue,org.apache.hadoop.io.WritableComparable,org.apache.hadoop.io.Writable>

This class include a reducer for CoGroup actor. It gets data from hadoop, executes sub-workflow in the cross actor via Kepler engine, and sends outputs back to hadoop.

Author:

Jianwu Wang (jianwu@sdsc.edu)

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
Reducer4CoGroup()

Method Summary

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

Reducer4CoGroup

public Reducer4CoGroup()

Method Detail

setup

public void setup(org.apache.hadoop.mapreduce.Reducer.Context context)

Overrides:

setup in class org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.WritableComparable,TaggedValue,org.apache.hadoop.io.WritableComparable,org.apache.hadoop.io.Writable>

reduce

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

Overrides:

reduce in class org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.WritableComparable,TaggedValue,org.apache.hadoop.io.WritableComparable,org.apache.hadoop.io.Writable>

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<org.apache.hadoop.io.WritableComparable,TaggedValue,org.apache.hadoop.io.WritableComparable,org.apache.hadoop.io.Writable>

Throws:

java.io.IOException

java.lang.InterruptedException