org.apache.hadoop.mapred.lib
Class TokenCountMapper

java.lang.Object
  org.apache.hadoop.mapred.MapReduceBase
      org.apache.hadoop.mapred.lib.TokenCountMapper

All Implemented Interfaces:

Closeable, JobConfigurable, Mapper

public class TokenCountMapper
extends MapReduceBase
implements Mapper

A Mapper that maps text values into pairs. Uses StringTokenizer to break text into tokens.

Constructor Summary

TokenCountMapper()

Method Summary

void	map(WritableComparable key, Writable value, OutputCollector output, Reporter reporter) Maps a single input key/value pair into intermediate key/value pairs.

Methods inherited from class org.apache.hadoop.mapred.MapReduceBase

close, configure

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.JobConfigurable

configure

Methods inherited from interface org.apache.hadoop.io.Closeable

close

Constructor Detail

TokenCountMapper

public TokenCountMapper()

Method Detail

map

public void map(WritableComparable key,
                Writable value,
                OutputCollector output,
                Reporter reporter)
         throws IOException

Description copied from interface: Mapper

Maps a single input key/value pair into intermediate key/value pairs. Output pairs need not be of the same types as input pairs. A given input pair may map to zero or many output pairs. Output pairs are collected with calls to OutputCollector.collect(WritableComparable,Writable).

Specified by:

map in interface Mapper

Parameters:

key - the key

value - the values

output - collects mapped keys and values

Throws:

IOException