org.apache.hadoop.examples

Class WordMedian.WordMedianMapper

java.lang.Object

org.apache.hadoop.mapreduce.Mapper<Object,org.apache.hadoop.io.Text,org.apache.hadoop.io.IntWritable,org.apache.hadoop.io.IntWritable>

org.apache.hadoop.examples.WordMedian.WordMedianMapper

Enclosing class:

WordMedian

public static class WordMedian.WordMedianMapper
extends org.apache.hadoop.mapreduce.Mapper<Object,org.apache.hadoop.io.Text,org.apache.hadoop.io.IntWritable,org.apache.hadoop.io.IntWritable>

Maps words from line of text into a key-value pair; the length of the word as the key, and 1 as the value.

Nested Class Summary

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

org.apache.hadoop.mapreduce.Mapper.Context

Constructor Summary

Constructors

Constructor and Description
WordMedian.WordMedianMapper()

Method Summary

Methods

Modifier and Type	Method and Description
void	map(Object key, org.apache.hadoop.io.Text value, org.apache.hadoop.mapreduce.Mapper.Context context) Emits a key-value pair for counting the word.

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

cleanup, run, setup

Methods inherited from class java.lang.Object

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

Constructor Detail

WordMedian.WordMedianMapper

public WordMedian.WordMedianMapper()

Method Detail

map

public void map(Object key,
       org.apache.hadoop.io.Text value,
       org.apache.hadoop.mapreduce.Mapper.Context context)
         throws IOException,
                InterruptedException

Emits a key-value pair for counting the word. Outputs are (IntWritable, IntWritable).

Overrides:

map in class org.apache.hadoop.mapreduce.Mapper<Object,org.apache.hadoop.io.Text,org.apache.hadoop.io.IntWritable,org.apache.hadoop.io.IntWritable>

Parameters:

value - This will be a line of text coming in from our input file.

Throws:

IOException

InterruptedException