org.apache.nutch.fetcher
Class FetcherJob

java.lang.Object
  org.apache.hadoop.conf.Configured
      org.apache.nutch.util.NutchTool
          org.apache.nutch.fetcher.FetcherJob

All Implemented Interfaces:

Configurable, Tool

public class FetcherJob
extends NutchTool
implements Tool

Multi-threaded fetcher.

Nested Class Summary

static class

FetcherJob.FetcherMapper Mapper class for Fetcher.

Field Summary

static org.slf4j.Logger	LOG
static String	PARSE_KEY
static int	PERM_REFRESH_TIME
static String	PROTOCOL_REDIR
static org.apache.avro.util.Utf8	REDIRECT_DISCOVERED
static String	RESUME_KEY
static String	THREADS_KEY

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

currentJob, currentJobNum, numJobs, results, status

Constructor Summary

FetcherJob()

FetcherJob(Configuration conf)

Method Summary

int	fetch(String batchId, int threads, boolean shouldResume, int numTasks) Run fetcher.
Collection<WebPage.Field>	getFields(Job job)
static void	main(String[] args)
Map<String,Object>	run(Map<String,Object> args) Runs the tool, using a map of arguments.
int	run(String[] args)

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

getProgress, getStatus, killJob, stopJob

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

PROTOCOL_REDIR

public static final String PROTOCOL_REDIR

See Also:

Constant Field Values

PERM_REFRESH_TIME

public static final int PERM_REFRESH_TIME

See Also:

Constant Field Values

REDIRECT_DISCOVERED

public static final org.apache.avro.util.Utf8 REDIRECT_DISCOVERED

RESUME_KEY

public static final String RESUME_KEY

See Also:

Constant Field Values

PARSE_KEY

public static final String PARSE_KEY

See Also:

Constant Field Values

THREADS_KEY

public static final String THREADS_KEY

See Also:

Constant Field Values

LOG

public static final org.slf4j.Logger LOG

Constructor Detail

FetcherJob

public FetcherJob()

FetcherJob

public FetcherJob(Configuration conf)

Method Detail

getFields

public Collection<WebPage.Field> getFields(Job job)

run

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

Description copied from class: NutchTool

Runs the tool, using a map of arguments. May return results, or null.

Specified by:

run in class NutchTool

Throws:

Exception

fetch

public int fetch(String batchId,
                 int threads,
                 boolean shouldResume,
                 int numTasks)
          throws Exception

Run fetcher.

Parameters:

batchId - batchId (obtained from Generator) or null to fetch all generated fetchlists

threads - number of threads per map task

shouldResume -

numTasks - number of fetching tasks (reducers). If set to < 1 then use the default, which is mapred.map.tasks.

Returns:

0 on success

Throws:

Exception

run

public int run(String[] args)
        throws Exception

Specified by:

run in interface Tool

Throws:

Exception

main

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

Throws:

Exception