weka.distributed.hadoop

Class CorrelationMatrixHadoopMapper

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.CorrelationMatrixHadoopMapper

public class CorrelationMatrixHadoopMapper
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 implementation for the correlation matrix job. Computes a full matrix of partial computed covariance sums using the data entering this map.

Version:

$Revision: 12439 $

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

Constructor Summary

Constructors

Constructor and Description
CorrelationMatrixHadoopMapper()

Method Summary

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

CORRELATION_MATRIX_MAP_TASK_OPTIONS

public static java.lang.String CORRELATION_MATRIX_MAP_TASK_OPTIONS

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

Constructor Detail

CorrelationMatrixHadoopMapper

public CorrelationMatrixHadoopMapper()

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