org.openimaj.hadoop.tools.twitter.token.outputmode.sparsecsv

Class MapValuesByWord

java.lang.Object

org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.Text,org.apache.hadoop.io.BytesWritable,org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.Text>

org.openimaj.hadoop.tools.twitter.token.outputmode.sparsecsv.MapValuesByWord

public class MapValuesByWord
extends org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.Text,org.apache.hadoop.io.BytesWritable,org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.Text>

Emits each word with the total number of times the word was seen

Author:

Sina Samangooei (ss@ecs.soton.ac.uk)

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
MapValuesByWord() construct the map instance (do nothing)

Method Summary

Modifier and Type	Method and Description
protected static void	loadOptions(org.apache.hadoop.mapreduce.Mapper.Context context)
void	map(org.apache.hadoop.io.Text key, org.apache.hadoop.io.BytesWritable value, org.apache.hadoop.mapreduce.Mapper.Context context)
protected void	setup(org.apache.hadoop.mapreduce.Mapper.Context context)

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

cleanup, run

Methods inherited from class java.lang.Object

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

Constructor Detail

MapValuesByWord

public MapValuesByWord()

construct the map instance (do nothing)

Method Detail

loadOptions

protected static void loadOptions(org.apache.hadoop.mapreduce.Mapper.Context context)
                           throws IOException

Throws:

IOException

setup

protected void setup(org.apache.hadoop.mapreduce.Mapper.Context context)
              throws IOException,
                     InterruptedException

Overrides:

setup in class org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.Text,org.apache.hadoop.io.BytesWritable,org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.Text>

Throws:

IOException

InterruptedException

map

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

Overrides:

map in class org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.Text,org.apache.hadoop.io.BytesWritable,org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.Text>

Throws:

IOException

InterruptedException