org.terrier.utility.io
Class HadoopUtility.ReduceBase<K1,V1,K2,V2>

java.lang.Object
  org.terrier.utility.io.HadoopUtility.ReduceBase<K1,V1,K2,V2>

Type Parameters:

K1 - key 1

V1 - value 1

K2 - key 2

V2 - value 2

All Implemented Interfaces:

Closeable, org.apache.hadoop.mapred.JobConfigurable, org.apache.hadoop.mapred.Reducer<K1,V1,K2,V2>

Enclosing class:

HadoopUtility

public abstract static class HadoopUtility.ReduceBase<K1,V1,K2,V2>
extends Object
implements org.apache.hadoop.mapred.Reducer<K1,V1,K2,V2>

Abstract class that provides default configure and close methods for a Reducer.

Author:

richardm

Field Summary

protected org.apache.hadoop.mapred.JobConf

jc

Constructor Summary

HadoopUtility.ReduceBase()

Method Summary

void	close() Called at end of map or reduce task.
protected void	closeMap()
protected abstract void	closeReduce()
void	configure(org.apache.hadoop.mapred.JobConf _jc)
protected void	configureMap()
protected abstract void	configureReduce()

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.hadoop.mapred.Reducer

reduce

Methods inherited from interface org.apache.hadoop.mapred.JobConfigurable

configure

Methods inherited from interface java.io.Closeable

close

Field Detail

jc

protected org.apache.hadoop.mapred.JobConf jc

Constructor Detail

HadoopUtility.ReduceBase

public HadoopUtility.ReduceBase()

Method Detail

configureMap

protected void configureMap()
                     throws IOException

Throws:

IOException

closeMap

protected void closeMap()
                 throws IOException

Throws:

IOException

configure

public void configure(org.apache.hadoop.mapred.JobConf _jc)

Specified by:

configure in interface org.apache.hadoop.mapred.JobConfigurable

configureReduce

protected abstract void configureReduce()
                                 throws IOException

Throws:

IOException

close

public void close()
           throws IOException

Called at end of map or reduce task. Calls internally closeMap() or closeReduce()

Specified by:

close in interface Closeable

Throws:

IOException

closeReduce

protected abstract void closeReduce()
                             throws IOException

Throws:

IOException