Package org.apache.nutch.crawl

Class CrawlDb

java.lang.Object

org.apache.hadoop.conf.Configured

org.apache.nutch.util.NutchTool

org.apache.nutch.crawl.CrawlDb

All Implemented Interfaces:

Configurable, Tool

public class CrawlDb
extends NutchTool
implements Tool

This class takes the output of the fetcher and updates the crawldb accordingly.

Field Summary

Fields

Modifier and Type	Field	Description
static final String	CRAWLDB_ADDITIONS_ALLOWED
static final String	CRAWLDB_PURGE_404
static final String	CRAWLDB_PURGE_ORPHANS
static final String	CURRENT_NAME
static final String	LOCK_NAME

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

currentJob, currentJobNum, numJobs, results, status

Constructor Summary

Constructors

Constructor	Description
CrawlDb()
CrawlDb(Configuration conf)

Method Summary

Modifier and Type	Method	Description
static Job	createJob(Configuration config, Path crawlDb)
static void	install(Job job, Path crawlDb)
static Path	lock(Configuration job, Path crawlDb, 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.
void	update(Path crawlDb, Path[] segments, boolean normalize, boolean filter)
void	update(Path crawlDb, Path[] segments, boolean normalize, boolean filter, boolean additionsAllowed, boolean force)

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

CRAWLDB_ADDITIONS_ALLOWED

public static final String CRAWLDB_ADDITIONS_ALLOWED

See Also:

• Constant Field Values

CRAWLDB_PURGE_404

public static final String CRAWLDB_PURGE_404

See Also:

• Constant Field Values

CRAWLDB_PURGE_ORPHANS

public static final String CRAWLDB_PURGE_ORPHANS

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

CrawlDb

public CrawlDb()

CrawlDb

public CrawlDb(Configuration conf)

Method Details

update

public void update(Path crawlDb,
 Path[] segments,
 boolean normalize,
 boolean filter)
            throws IOException,
InterruptedException,
ClassNotFoundException

Throws:

IOException

InterruptedException

ClassNotFoundException

update

public void update(Path crawlDb,
 Path[] segments,
 boolean normalize,
 boolean filter,
 boolean additionsAllowed,
 boolean force)
            throws IOException,
InterruptedException,
ClassNotFoundException

Throws:

IOException

InterruptedException

ClassNotFoundException

createJob

public static Job createJob(Configuration config,
 Path crawlDb)
                     throws IOException

Throws:

IOException

lock

public static Path lock(Configuration job,
 Path crawlDb,
 boolean force)
                 throws IOException

Throws:

IOException

install

public static void install(Job job,
 Path crawlDb)
                    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