Package org.apache.nutch.crawl

Class LinkDb

java.lang.Object

org.apache.hadoop.conf.Configured

org.apache.nutch.util.NutchTool

org.apache.nutch.crawl.LinkDb

All Implemented Interfaces:

Configurable, Tool

public class LinkDb
extends NutchTool
implements Tool

Maintains an inverted link map, listing incoming links for each url.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	LinkDb.LinkDbMapper

Field Summary

Fields

Modifier and Type	Field	Description
static final String	CURRENT_NAME
static final String	IGNORE_EXTERNAL_LINKS
static final String	IGNORE_INTERNAL_LINKS
static final String	LOCK_NAME

Fields inherited from class org.apache.nutch.util.NutchTool

currentJob, currentJobNum, numJobs, results, status

Constructor Summary

Constructors

Constructor	Description
LinkDb()
LinkDb(Configuration conf)

Method Summary

Modifier and Type	Method	Description
static void	install(Job job, Path linkDb)
void	invert(Path linkDb, Path[] segments, boolean normalize, boolean filter, boolean force)
void	invert(Path linkDb, Path segmentsDir, boolean normalize, boolean filter, boolean force)
static void	main(String[] args)
int	run(String[] args)
Map<String,Object>	run(Map<String,Object> args, String crawlId)	Programmatic entry point for NutchTool callers.

Methods inherited from class org.apache.nutch.util.NutchTool

getProgress, getStatus, killJob, setConf, stopJob

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

getConf

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 Details

IGNORE_INTERNAL_LINKS

public static final String IGNORE_INTERNAL_LINKS

See Also:

• Constant Field Values

IGNORE_EXTERNAL_LINKS

public static final String IGNORE_EXTERNAL_LINKS

See Also:

• Constant Field Values

CURRENT_NAME

public static final String CURRENT_NAME

See Also:

• Constant Field Values

LOCK_NAME

public static final String LOCK_NAME

See Also:

• Constant Field Values

Constructor Details

LinkDb

public LinkDb()

LinkDb

public LinkDb(Configuration conf)

Method Details

invert

public void invert(Path linkDb,
 Path segmentsDir,
 boolean normalize,
 boolean filter,
 boolean force)
            throws IOException,
InterruptedException,
ClassNotFoundException

Throws:

IOException

InterruptedException

ClassNotFoundException

invert

public void invert(Path linkDb,
 Path[] segments,
 boolean normalize,
 boolean filter,
 boolean force)
            throws IOException,
InterruptedException,
ClassNotFoundException

Throws:

IOException

InterruptedException

ClassNotFoundException

install

public static void install(Job job,
 Path linkDb)
                    throws IOException

Throws:

IOException

main

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

Throws:

Exception

run

public int run(String[] args)
        throws Exception

Specified by:

run in interface Tool

Throws:

Exception

run

public Map<String,Object> run(Map<String,Object> args,
 String crawlId)
                       throws Exception

Programmatic entry point for NutchTool callers.

Specified by:

run in class NutchTool

Parameters:

args - a Map of arguments to be run with the tool

crawlId - a crawl identifier to associate with the tool invocation

Returns:

Map results object if tool executes successfully otherwise null

Throws:

Exception - if there is an error during the tool execution