org.apache.mahout.utils

Class SplitInputJob.SplitInputMapper

java.lang.Object

org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.WritableComparable<?>,org.apache.hadoop.io.Writable,org.apache.hadoop.io.WritableComparable<?>,org.apache.hadoop.io.Writable>

org.apache.mahout.utils.SplitInputJob.SplitInputMapper

Enclosing class:

SplitInputJob

public static class SplitInputJob.SplitInputMapper
extends org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.WritableComparable<?>,org.apache.hadoop.io.Writable,org.apache.hadoop.io.WritableComparable<?>,org.apache.hadoop.io.Writable>

Mapper which downsamples the input by downsamplingFactor

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
SplitInputJob.SplitInputMapper()

Method Summary

Methods

Modifier and Type	Method and Description
void	run(org.apache.hadoop.mapreduce.Mapper.Context context) Only run map() for one out of every downsampleFactor inputs
void	setup(org.apache.hadoop.mapreduce.Mapper.Context context)

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

cleanup, map

Methods inherited from class java.lang.Object

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

Constructor Detail

SplitInputJob.SplitInputMapper

public SplitInputJob.SplitInputMapper()

Method Detail

setup

public void setup(org.apache.hadoop.mapreduce.Mapper.Context context)

Overrides:

setup in class org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.WritableComparable<?>,org.apache.hadoop.io.Writable,org.apache.hadoop.io.WritableComparable<?>,org.apache.hadoop.io.Writable>

run

public void run(org.apache.hadoop.mapreduce.Mapper.Context context)
         throws IOException,
                InterruptedException

Only run map() for one out of every downsampleFactor inputs

Overrides:

run in class org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.WritableComparable<?>,org.apache.hadoop.io.Writable,org.apache.hadoop.io.WritableComparable<?>,org.apache.hadoop.io.Writable>

Throws:

IOException

InterruptedException