org.apache.nutch.mapReduce.lib
Class IdentityReducer

java.lang.Object
  org.apache.nutch.mapReduce.lib.IdentityReducer

All Implemented Interfaces:

Configurable, Reducer

public class IdentityReducer

extends Object

implements Reducer

Performs no reduction, writing all input values directly to the output.

Constructor Summary

IdentityReducer()

Method Summary

void	configure(JobConf job) Initializes a new instance from a JobConf.
void	reduce(WritableComparable key, Iterator values, OutputCollector output) Writes all keys and values directly to output.

Methods inherited from class java.lang.Object

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

Constructor Detail

IdentityReducer

public IdentityReducer()

Method Detail

configure

public void configure(JobConf job)

Description copied from interface: Configurable

Initializes a new instance from a JobConf.

Specified by:

configure in interface Configurable

Parameters:

job - the configuration

reduce

public void reduce(WritableComparable key,
                   Iterator values,
                   OutputCollector output)
            throws IOException

Writes all keys and values directly to output.

Specified by:

reduce in interface Reducer

Parameters:

key - the key

values - the values to combine

output - to collect combined values

Throws:

IOException