edu.umd.cloud9.example.simple
Class DemoWordCountTuple1

java.lang.Object
  org.apache.hadoop.conf.Configured
      edu.umd.cloud9.example.simple.DemoWordCountTuple1

All Implemented Interfaces:

Configurable, Tool

public class DemoWordCountTuple1
extends Configured
implements Tool

Demo that illustrates use of Tuple objects as intermediate keys in a MapReduce job. This Hadoop Tool takes the following command-line arguments:

• [input-path] input path
• [output-path] output path
• [num-reducers] number of reducers

Input comes from a flat text collection packed into a SequenceFile with DemoPackTuples1. Output shows the count of words on even- and odd-length lines.

Format of the output SequenceFile: The key is a Tuple. The first field of the tuple contains a word and the second field indicates whether the word was found on a even-length or odd-length line. The value is the count of the word on either even- or odd-length lines.

Author:

Jimmy Lin

See Also:

DemoWordCountTuple2, DemoWordCountJSON

Constructor Summary

DemoWordCountTuple1()
Creates an instance of this tool.

Method Summary

static void	main(String[] args) Dispatches command-line arguments to the tool via the ToolRunner.
int	run(String[] args) Runs this tool.

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

getConf, setConf

Methods inherited from class java.lang.Object

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

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

getConf, setConf

Constructor Detail

DemoWordCountTuple1

public DemoWordCountTuple1()

Creates an instance of this tool.

Method Detail

run

public int run(String[] args)
        throws Exception

Runs this tool.

Specified by:

run in interface Tool

Throws:

Exception

main

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

Dispatches command-line arguments to the tool via the ToolRunner.

Throws:

Exception