org.apache.hadoop.examples

Class DBCountPageView

java.lang.Object

org.apache.hadoop.conf.Configured

org.apache.hadoop.examples.DBCountPageView

All Implemented Interfaces:

Configurable, Tool

public class DBCountPageView
extends Configured
implements Tool

This is a demonstrative program, which uses DBInputFormat for reading the input data from a database, and DBOutputFormat for writing the data to the database.
The Program first creates the necessary tables, populates the input table and runs the mapred job.
The input data is a mini access log, with a <url,referrer,time> schema.The output is the number of pageviews of each url in the log, having the schema <url,pageview>. When called with no arguments the program starts a local HSQLDB server, and uses this database for storing/retrieving the data.
This program requires some additional configuration relating to HSQLDB. The the hsqldb jar should be added to the classpath:
export HADOOP_CLASSPATH=share/hadoop/mapreduce/lib-examples/hsqldb-2.0.0.jar
And the hsqldb jar should be included with the -libjars argument when executing it with hadoop:
-libjars share/hadoop/mapreduce/lib-examples/hsqldb-2.0.0.jar

Constructor Summary

Constructors

Constructor and Description
DBCountPageView()

Method Summary

Methods

Modifier and Type	Method and Description
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

DBCountPageView

public DBCountPageView()

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