org.apache.nutch.scoring.webgraph

Class LinkDumper.Merger

java.lang.Object

org.apache.nutch.scoring.webgraph.LinkDumper.Merger

All Implemented Interfaces:

Closeable, AutoCloseable, org.apache.hadoop.mapred.JobConfigurable, org.apache.hadoop.mapred.Reducer<org.apache.hadoop.io.Text,LinkDumper.LinkNode,org.apache.hadoop.io.Text,LinkDumper.LinkNodes>

Enclosing class:

LinkDumper

public static class LinkDumper.Merger
extends Object
implements org.apache.hadoop.mapred.Reducer<org.apache.hadoop.io.Text,LinkDumper.LinkNode,org.apache.hadoop.io.Text,LinkDumper.LinkNodes>

Merges LinkNode objects into a single array value per url. This allows all values to be quickly retrieved and printed via the Reader tool.

Constructor Summary

Constructors

Constructor and Description
LinkDumper.Merger()

Method Summary

Methods

Modifier and Type	Method and Description
void	close()
void	configure(org.apache.hadoop.mapred.JobConf conf)
void	reduce(org.apache.hadoop.io.Text key, Iterator<LinkDumper.LinkNode> values, org.apache.hadoop.mapred.OutputCollector<org.apache.hadoop.io.Text,LinkDumper.LinkNodes> output, org.apache.hadoop.mapred.Reporter reporter) Aggregate all LinkNode objects for a given url.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

LinkDumper.Merger

public LinkDumper.Merger()

Method Detail

configure

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

Specified by:

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

reduce

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

Aggregate all LinkNode objects for a given url.

Specified by:

reduce in interface org.apache.hadoop.mapred.Reducer<org.apache.hadoop.io.Text,LinkDumper.LinkNode,org.apache.hadoop.io.Text,LinkDumper.LinkNodes>

Throws:

IOException

close

public void close()

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable