# Package org.apache.nutch.scoring.webgraph

Scoring implementation based on link analysis (`LinkRank`), see `WebGraph`.

See: Description

- Class Summary
  Class | Description
  --- | ---
  LinkDatum | A class for holding link information including the url, anchor text, a score, the timestamp of the link and a link type.
  LinkDumper | The LinkDumper tool creates a database of node to inlink information that can be read using the nested Reader class.
  LinkDumper.Inverter | Inverts outlinks from the WebGraph to inlinks and attaches node information.
  LinkDumper.Inverter.InvertMapper | Wraps all values in ObjectWritables.
  LinkDumper.Inverter.InvertReducer | Inverts outlinks to inlinks while attaching node information to the outlink.
  LinkDumper.LinkNode | Bean class which holds url to node information.
  LinkDumper.LinkNodes | Writable class which holds an array of LinkNode objects.
  LinkDumper.Merger | Merges LinkNode objects into a single array value per url.
  LinkDumper.Reader | Reader class which will print out the url and all of its inlinks to system out.
  LinkRank |
  Node | A class which holds the number of inlinks and outlinks for a given url along with an inlink score from a link analysis program and any metadata.
  NodeDumper | A tools that dumps out the top urls by number of inlinks, number of outlinks, or by score, to a text file.
  NodeDumper.Dumper | Outputs the hosts or domains with an associated value.
  NodeDumper.Dumper.DumperMapper | Outputs the host or domain as key for this record and numInlinks, numOutlinks or score as the value.
  NodeDumper.Dumper.DumperReducer | Outputs either the sum or the top value for this record.
  NodeDumper.Sorter | Outputs the top urls sorted in descending order.
  NodeDumper.Sorter.SorterMapper | Outputs the url with the appropriate number of inlinks, outlinks, or for score.
  NodeDumper.Sorter.SorterReducer | Flips and collects the url and numeric sort value.
  NodeReader | Reads and prints to system out information for a single node from the NodeDb in the WebGraph.
  ScoreUpdater | Updates the score from the WebGraph node database into the crawl database.
  ScoreUpdater.ScoreUpdaterMapper | Changes input into ObjectWritables.
  ScoreUpdater.ScoreUpdaterReducer | Creates new CrawlDatum objects with the updated score from the NodeDb or with a cleared score.
  WebGraph | Creates three databases, one for inlinks, one for outlinks, and a node database that holds the number of in and outlinks to a url and the current score for the url.
  WebGraph.OutlinkDb | The OutlinkDb creates a database of all outlinks.
  WebGraph.OutlinkDb.OutlinkDbMapper | Passes through existing LinkDatum objects from an existing OutlinkDb and maps out new LinkDatum objects from new crawls ParseData.
  WebGraph.OutlinkDb.OutlinkDbReducer |

## Package org.apache.nutch.scoring.webgraph Description

Scoring implementation based on link analysis (`LinkRank`), see `WebGraph`.

Copyright © 2020 The Apache Software Foundation