weka.distributed.hadoop

Class KMeansHadoopMapper

java.lang.Object

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

weka.distributed.hadoop.KMeansHadoopMapper

public class KMeansHadoopMapper
extends org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.Text,org.apache.hadoop.io.Text,org.apache.hadoop.io.BytesWritable>

Hadoop mapper for a k-means iteration.

Version:

$Revision: 11164 $

Author:

Mark Hall (mhall{[at]}pentaho{[dot]}com)

Nested Class Summary

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

org.apache.hadoop.mapreduce.Mapper.Context

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	KMEANS_MAP_FILE_PREFIX File prefix for serialized kmeans map objects
static java.lang.String	KMEANS_MAP_TASK_OPTIONS The key in the Configuration that the options for this task are associated with

Constructor Summary

Constructors

Constructor and Description
KMeansHadoopMapper()

Method Summary

Methods

Modifier and Type	Method and Description
void	cleanup(org.apache.hadoop.mapreduce.Mapper.Context context)
void	map(org.apache.hadoop.io.LongWritable key, org.apache.hadoop.io.Text value, org.apache.hadoop.mapreduce.Mapper.Context context)
void	setup(org.apache.hadoop.mapreduce.Mapper.Context context)

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

run

Methods inherited from class java.lang.Object

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

Field Detail

KMEANS_MAP_TASK_OPTIONS

public static final java.lang.String KMEANS_MAP_TASK_OPTIONS

The key in the Configuration that the options for this task are associated with

See Also:

Constant Field Values

KMEANS_MAP_FILE_PREFIX

public static final java.lang.String KMEANS_MAP_FILE_PREFIX

File prefix for serialized kmeans map objects

See Also:

Constant Field Values

Constructor Detail

KMeansHadoopMapper

public KMeansHadoopMapper()

Method Detail

setup

public void setup(org.apache.hadoop.mapreduce.Mapper.Context context)
           throws java.io.IOException

Overrides:

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

Throws:

java.io.IOException

map

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

Overrides:

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

Throws:

java.io.IOException

cleanup

public void cleanup(org.apache.hadoop.mapreduce.Mapper.Context context)
             throws java.io.IOException,
                    java.lang.InterruptedException

Overrides:

cleanup in class org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.Text,org.apache.hadoop.io.Text,org.apache.hadoop.io.BytesWritable>

Throws:

java.io.IOException

java.lang.InterruptedException