The Index Structure

The index structure formed after indexing is shown below :

Field Name

Stored

Index

Plugin/Class

Comment

version

1.x

2.x

id

YES

Indexed, Un-Tokenized

IndexerMapReduce/IndexUtil

URL used as ID to update and delete documents

X

X

boost

YES

Not Indexed

various scoring plugins

Adds a score value field to a particular document. This is allocated based upon its importance within the webgraph.

?

?

digest

YES

Not Indexed

org.apache.nutch.indexer.IndexerMapReduce.java

Adds a message digest field to a document. Can be MD5 over content and headers or more sophisticated text profile of the content.

?

?

lang

YES

Un-Tokenized

language-identifier

Add a lang, language field to a document.

?

?

segment

YES

Not Indexed

org.apache.nutch.indexer.IndexerMapReduce.java

Adds the originating segment field to the document, used to identify the most recent segment in which this document was fetched.

?

?

tstamp

YES

Tokenized

/!\ NEEDS COMMENT /!\

Adds a timestamp field of the most recent time this document was fetched

?

?

cc:license

YES

Indexed, Tokenized

creativecommons

Adds the entire license as cc:license=xxx and attributes extracted of the license url

?

?

cc:meta

YES

Indexed, Tokenized

creativecommons

Adds the license location as cc:meta=xxx

?

?

cc:type

YES

Indexed,Tokenized

creativecommons

Adds the work type as cc:type=xxx

?

?

anchor

NO

Tokenized

index-anchor

Indexing filter that indexes all inbound anchor text for a document.

?

?

title

YES

Tokenized

index-basic

Adds basic searchable title field to a document. Also indexed by index-more

?

?

host

NO

Tokenized

index-basic

Adds basic searchable hostname field to a document.

?

?

url

YES

Tokenized

index-basic

Adds basic searchable URL field to a document.

?

?

content

NO

Tokenized

index-basic

Adds basic searchable content field to a document.

?

?

lastModified

NO

Indexed, Un-Tokenized

index-more

Adds some time related meta info in the form of last-modified if present.

?

?

date

NO

Indexed, Un-Tokenized

index-more

Index date as last-modified, or, if that's not present, uses fetch time.

?

?

contentLength

NO

Indexed, Un-Tokenized

index-more

/!\ NEEDS COMMENT /!\

?

?

type

NO

Indexed, Un-Tokenized

index-more

Adds contentType, primaryType, subType (all mime-types)

?

?

primaryType

NO

Indexed, Un-Tokenized

index-more

primaryType (mime-type)

?

?

subType

NO

Indexed, Un-Tokenized

index-more

subType (mime-type)

?

?

tld

YES

Un-Tokenized / NotStored(based on conf)

tld

Adds a top level domain field to the document.

?

?

subcollection

YES

Tokenized

subcollection

For Comprehensive description see src/java/org/apache/nutch/collection/package.html

?

?

urlmeta

NO

Indexed, Un-Tokenized

urlmeta

Adds any specified url metadata tags to the document in the index.

?

?


Jira Issues about indexing and IndexingFilterPlugins are


The index plugins to include are :

IndexStructure (last edited 2014-07-29 15:44:36 by SebastianNagel)