gov.llnl.ontology.mapreduce.stats
Class WordSumReducer

java.lang.Object
  org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.Text,org.apache.hadoop.io.Text,org.apache.hadoop.io.Text,org.apache.hadoop.io.Text>
      gov.llnl.ontology.mapreduce.stats.WordSumReducer

public class WordSumReducer
extends org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.Text,org.apache.hadoop.io.Text,org.apache.hadoop.io.Text,org.apache.hadoop.io.Text>

This Reducer counts the number of times that they key occures with each of it's values. It emits each a tuple of the form: (key,other_item), co-occurrence_count Where the first item is emited as a single Text object and the count is a IntWritable object.

Author:

Keith Stevens

Nested Class Summary

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

org.apache.hadoop.mapreduce.Reducer.Context

Constructor Summary

WordSumReducer()

Method Summary

void	reduce(org.apache.hadoop.io.Text key, Iterable<org.apache.hadoop.io.Text> values, org.apache.hadoop.mapreduce.Reducer.Context context)

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

cleanup, run, setup

Methods inherited from class java.lang.Object

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

Constructor Detail

WordSumReducer

public WordSumReducer()

Method Detail

reduce

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

Overrides:

reduce in class org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.Text,org.apache.hadoop.io.Text,org.apache.hadoop.io.Text,org.apache.hadoop.io.Text>

Throws:

IOException

InterruptedException