org.apache.hadoop.examples

Class Sort<K,V>

java.lang.Object

org.apache.hadoop.conf.Configured

org.apache.hadoop.examples.Sort<K,V>

All Implemented Interfaces:

Configurable, Tool

public class Sort<K,V>
extends Configured
implements Tool

This is the trivial map/reduce program that does absolutely nothing other than use the framework to fragment and sort the input values. To run: bin/hadoop jar build/hadoop-examples.jar sort [-r reduces] [-inFormat input format class] [-outFormat output format class] [-outKey output key class] [-outValue output value class] [-totalOrder pcnt num samples max splits] in-dir out-dir

Field Summary

Fields

Modifier and Type	Field and Description
static String	REDUCES_PER_HOST

Constructor Summary

Constructors

Constructor and Description
Sort()

Method Summary

Modifier and Type	Method and Description
org.apache.hadoop.mapreduce.Job	getResult() Get the last job that was run using this instance.
static void	main(String[] args)
int	run(String[] args) The main driver for sort program.

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

Field Detail

REDUCES_PER_HOST

public static final String REDUCES_PER_HOST

See Also:

Constant Field Values

Constructor Detail

Sort

public Sort()

Method Detail

run

public int run(String[] args)
        throws Exception

The main driver for sort program. Invoke this method to submit the map/reduce job.

Specified by:

run in interface Tool

Throws:

IOException - When there is communication problems with the job tracker.

Exception

main

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

Throws:

Exception

getResult

public org.apache.hadoop.mapreduce.Job getResult()

Get the last job that was run using this instance.

Returns:

the results of the last job that was run