org.apache.tez.mapreduce.examples

Class SecondarySort

java.lang.Object

org.apache.hadoop.conf.Configured

org.apache.tez.mapreduce.examples.SecondarySort

All Implemented Interfaces:

org.apache.hadoop.conf.Configurable, org.apache.hadoop.util.Tool

public class SecondarySort
extends org.apache.hadoop.conf.Configured
implements org.apache.hadoop.util.Tool

This is an example Hadoop Map/Reduce application. It reads the text input files that must contain two integers per a line. The output is sorted by the first and second number and grouped on the first number. To run: bin/hadoop jar build/hadoop-examples.jar secondarysort in-dir out-dir

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	SecondarySort.FirstGroupingComparator Compare only the first part of the pair, so that reduce is called once for each value of the first part.
static class	SecondarySort.FirstPartitioner Partition based on the first part of the pair.
static class	SecondarySort.IntPair Define a pair of integers that are writable.
static class	SecondarySort.MapClass Read two integers from each line and generate a key, value pair as ((left, right), right).
static class	SecondarySort.Reduce A reducer class that just emits the sum of the input values.

Constructor Summary

Constructors

Constructor and Description
SecondarySort()

Method Summary

Modifier and Type	Method and Description
static void	main(String[] args)
int	run(String[] args)

Methods inherited from class org.apache.hadoop.conf.Configured

getConf, setConf

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.hadoop.conf.Configurable

getConf, setConf

Constructor Detail

SecondarySort

public SecondarySort()

Method Detail

run

public int run(String[] args)
        throws Exception

Specified by:

run in interface org.apache.hadoop.util.Tool

Throws:

Exception

main

public static void main(String[] args)
                 throws Exception

Throws:

Exception