org.apache.hadoop.examples
Class Join

java.lang.Object
  org.apache.hadoop.conf.Configured
      org.apache.hadoop.examples.Join

All Implemented Interfaces:

Configurable, Tool

public class Join
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 join [-m maps] [-r reduces] [-inFormat input format class] [-outFormat output format class] [-outKey output key class] [-outValue output value class] [-joinOp <inner|outer|override>] [in-dir]* in-dir out-dir

Constructor Summary

Join()

Method Summary

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

Constructor Detail

Join

public Join()

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

Parameters:

args - command specific arguments.

Returns:

exit code.

Throws:

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

Exception

main

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

Throws:

Exception