org.apache.hadoop.examples
Class MultiFileWordCount

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

All Implemented Interfaces:

Configurable, Tool

public class MultiFileWordCount
extends Configured
implements Tool

MultiFileWordCount is an example to demonstrate the usage of MultiFileInputFormat. This examples counts the occurrences of words in the text files under the given input directory.

Nested Class Summary

static class	MultiFileWordCount.MapClass This Mapper is similar to the one in MultiFileWordCount.MapClass.
static class	MultiFileWordCount.MultiFileLineRecordReader RecordReader is responsible from extracting records from the InputSplit.
static class	MultiFileWordCount.MyInputFormat To use MultiFileInputFormat, one should extend it, to return a (custom) RecordReader.
static class	MultiFileWordCount.WordOffset This record keeps <filename,offset> pairs.

Constructor Summary

MultiFileWordCount()

Method Summary

static void	main(String[] args)
int	run(String[] args) Execute the command with the given arguments.

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

MultiFileWordCount

public MultiFileWordCount()

Method Detail

run

public int run(String[] args)
        throws Exception

Description copied from interface: Tool

Execute the command with the given arguments.

Specified by:

run in interface Tool

Parameters:

args - command specific arguments.

Returns:

exit code.

Throws:

Exception

main

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

Throws:

Exception