org.apache.hadoop.examples.terasort

Class TeraGen.SortGenMapper

java.lang.Object

org.apache.hadoop.mapreduce.Mapper<LongWritable,NullWritable,Text,Text>

org.apache.hadoop.examples.terasort.TeraGen.SortGenMapper

Enclosing class:

TeraGen

public static class TeraGen.SortGenMapper
extends Mapper<LongWritable,NullWritable,Text,Text>

The Mapper class that given a row number, will generate the appropriate output line.

Nested Class Summary

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

Mapper.Context

Constructor Summary

Constructors

Constructor and Description
TeraGen.SortGenMapper()

Method Summary

Methods

Modifier and Type	Method and Description
void	cleanup(Mapper.Context context) Called once at the end of the task.
void	map(LongWritable row, NullWritable ignored, Mapper.Context context) Called once for each key/value pair in the input split.

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

run, setup

Methods inherited from class java.lang.Object

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

Constructor Detail

TeraGen.SortGenMapper

public TeraGen.SortGenMapper()

Method Detail

map

public void map(LongWritable row,
       NullWritable ignored,
       Mapper.Context context)
         throws IOException,
                InterruptedException

Description copied from class: Mapper

Called once for each key/value pair in the input split. Most applications should override this, but the default is the identity function.

Overrides:

map in class Mapper<LongWritable,NullWritable,Text,Text>

Throws:

IOException

InterruptedException

cleanup

public void cleanup(Mapper.Context context)

Description copied from class: Mapper

Called once at the end of the task.

Overrides:

cleanup in class Mapper<LongWritable,NullWritable,Text,Text>