org.apache.nutch.scoring.webgraph

Class ScoreUpdater

java.lang.Object

org.apache.hadoop.conf.Configured

org.apache.nutch.scoring.webgraph.ScoreUpdater

All Implemented Interfaces:

Closeable, AutoCloseable, org.apache.hadoop.conf.Configurable, org.apache.hadoop.mapred.JobConfigurable, org.apache.hadoop.mapred.Mapper<org.apache.hadoop.io.Text,org.apache.hadoop.io.Writable,org.apache.hadoop.io.Text,org.apache.hadoop.io.ObjectWritable>, org.apache.hadoop.mapred.Reducer<org.apache.hadoop.io.Text,org.apache.hadoop.io.ObjectWritable,org.apache.hadoop.io.Text,CrawlDatum>, org.apache.hadoop.util.Tool

public class ScoreUpdater
extends org.apache.hadoop.conf.Configured
implements org.apache.hadoop.util.Tool, org.apache.hadoop.mapred.Mapper<org.apache.hadoop.io.Text,org.apache.hadoop.io.Writable,org.apache.hadoop.io.Text,org.apache.hadoop.io.ObjectWritable>, org.apache.hadoop.mapred.Reducer<org.apache.hadoop.io.Text,org.apache.hadoop.io.ObjectWritable,org.apache.hadoop.io.Text,CrawlDatum>

Updates the score from the WebGraph node database into the crawl database. Any score that is not in the node database is set to the clear score in the crawl database.

Field Summary

Fields

Modifier and Type	Field and Description
static org.slf4j.Logger	LOG

Constructor Summary

Constructors

Constructor and Description
ScoreUpdater()

Method Summary

Methods

Modifier and Type	Method and Description
void	close()
void	configure(org.apache.hadoop.mapred.JobConf conf)
static void	main(String[] args)
void	map(org.apache.hadoop.io.Text key, org.apache.hadoop.io.Writable value, org.apache.hadoop.mapred.OutputCollector<org.apache.hadoop.io.Text,org.apache.hadoop.io.ObjectWritable> output, org.apache.hadoop.mapred.Reporter reporter) Changes input into ObjectWritables.
void	reduce(org.apache.hadoop.io.Text key, Iterator<org.apache.hadoop.io.ObjectWritable> values, org.apache.hadoop.mapred.OutputCollector<org.apache.hadoop.io.Text,CrawlDatum> output, org.apache.hadoop.mapred.Reporter reporter) Creates new CrawlDatum objects with the updated score from the NodeDb or with a cleared score.
int	run(String[] args) Runs the ScoreUpdater tool.
void	update(org.apache.hadoop.fs.Path crawlDb, org.apache.hadoop.fs.Path webGraphDb) Updates the inlink score in the web graph node databsae into the crawl database.

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

LOG

public static final org.slf4j.Logger LOG

Constructor Detail

ScoreUpdater

public ScoreUpdater()

Method Detail

configure

public void configure(org.apache.hadoop.mapred.JobConf conf)

Specified by:

configure in interface org.apache.hadoop.mapred.JobConfigurable

map

public void map(org.apache.hadoop.io.Text key,
       org.apache.hadoop.io.Writable value,
       org.apache.hadoop.mapred.OutputCollector<org.apache.hadoop.io.Text,org.apache.hadoop.io.ObjectWritable> output,
       org.apache.hadoop.mapred.Reporter reporter)
         throws IOException

Changes input into ObjectWritables.

Specified by:

map in interface org.apache.hadoop.mapred.Mapper<org.apache.hadoop.io.Text,org.apache.hadoop.io.Writable,org.apache.hadoop.io.Text,org.apache.hadoop.io.ObjectWritable>

Throws:

IOException

reduce

public void reduce(org.apache.hadoop.io.Text key,
          Iterator<org.apache.hadoop.io.ObjectWritable> values,
          org.apache.hadoop.mapred.OutputCollector<org.apache.hadoop.io.Text,CrawlDatum> output,
          org.apache.hadoop.mapred.Reporter reporter)
            throws IOException

Creates new CrawlDatum objects with the updated score from the NodeDb or with a cleared score.

Specified by:

reduce in interface org.apache.hadoop.mapred.Reducer<org.apache.hadoop.io.Text,org.apache.hadoop.io.ObjectWritable,org.apache.hadoop.io.Text,CrawlDatum>

Throws:

IOException

close

public void close()

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

update

public void update(org.apache.hadoop.fs.Path crawlDb,
          org.apache.hadoop.fs.Path webGraphDb)
            throws IOException

Updates the inlink score in the web graph node databsae into the crawl database.

Parameters:

crawlDb - The crawl database to update

webGraphDb - The webgraph database to use.

Throws:

IOException - If an error occurs while updating the scores.

main

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

Throws:

Exception

run

public int run(String[] args)
        throws Exception

Runs the ScoreUpdater tool.

Specified by:

run in interface org.apache.hadoop.util.Tool

Throws:

Exception