org.apache.mahout.common.mapreduce

Class TransposeMapper

java.lang.Object

org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.IntWritable,VectorWritable,org.apache.hadoop.io.IntWritable,VectorWritable>

org.apache.mahout.common.mapreduce.TransposeMapper

public class TransposeMapper
extends org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.IntWritable,VectorWritable,org.apache.hadoop.io.IntWritable,VectorWritable>

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 String	NEW_NUM_COLS_PARAM

Constructor Summary

Constructors

Constructor and Description
TransposeMapper()

Method Summary

Modifier and Type	Method and Description
protected void	map(org.apache.hadoop.io.IntWritable r, VectorWritable v, org.apache.hadoop.mapreduce.Mapper.Context ctx)
protected void	setup(org.apache.hadoop.mapreduce.Mapper.Context ctx)

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

Field Detail

NEW_NUM_COLS_PARAM

public static final String NEW_NUM_COLS_PARAM

Constructor Detail

TransposeMapper

public TransposeMapper()

Method Detail

setup

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

Overrides:

setup in class org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.IntWritable,VectorWritable,org.apache.hadoop.io.IntWritable,VectorWritable>

Throws:

IOException

InterruptedException

map

protected void map(org.apache.hadoop.io.IntWritable r,
                   VectorWritable v,
                   org.apache.hadoop.mapreduce.Mapper.Context ctx)
            throws IOException,
                   InterruptedException

Overrides:

map in class org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.IntWritable,VectorWritable,org.apache.hadoop.io.IntWritable,VectorWritable>

Throws:

IOException

InterruptedException