Apache lucene - full text search

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Marcelo Cure

Technology

What’s that?
 API created on 00’s
 Apache owns that
 Indexing
 Searching
 Available on Java, .NET, C++

Why is that so good?
 Enhance user experience
 More inteligent products
 Speed processing
 Relevance
 Efficient
 Suggestions

Indexing
 IndexWritter
1. Directory implementation
2. Analizer
 Create documents
 Add these document to IndexWritter
 Optimize (merge segments)
 Close writter

Searching
 Directory
 IndexSearcher
 QueryParser
 Query(“my search”)
 TopDocs

How does that work?
 Inverted Index
 Term Normalization
1. Similar words (merge)
2. Stop words (remove)
3. +relevance –size on disk
Term Document Ids
And 1,2,3
Big 2,4,7
Fire 1
Keep 7,8
keeper 3,4
the 1,8

Analyzers
“@Andy52 went to school yesterday!”
 StandardAnalyzer
[@Andy52] [went] [school] [yesterday!]
 StopAnalyzer
[Andy] [went] [school] [yesterday]
 SimpleAnalyzer
[andy] [went] [to] [school] [yesterday]
 WhitespaceAnalyzer
[@Andy52] [went] [to] [school] [yesterday]
 KeywordAnalyzer
[@Andy52 went to school yesterday!]

What known apps use that?
 Twitter
 Linked In
 My Space

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Apache lucene - full text search

1. Apache Lucene Full text search Marcelo

2. What’s that?  API created on 00’s  Apache owns that  Indexing  Searching  Available on Java, .NET, C++

3. Why is that so good?  Enhance user experience  More inteligent products  Speed processing  Relevance  Efficient  Suggestions

4. Indexing  IndexWritter 1. Directory implementation 2. Analizer  Create documents  Add these document to IndexWritter  Optimize (merge segments)  Close writter

5. Indexing

6. Searching  Directory  IndexSearcher  QueryParser  Query(“my search”)  TopDocs

7. Searching

8. How does that work?  Inverted Index  Term Normalization 1. Similar words (merge) 2. Stop words (remove) 3. +relevance –size on disk Term Document Ids And 1,2,3 Big 2,4,7 Fire 1 Keep 7,8 keeper 3,4 the 1,8

9. Analyzers “@Andy52 went to school yesterday!”  StandardAnalyzer [@Andy52] [went] [school] [yesterday!]  StopAnalyzer [Andy] [went] [school] [yesterday]  SimpleAnalyzer [andy] [went] [to] [school] [yesterday]  WhitespaceAnalyzer [@Andy52] [went] [to] [school] [yesterday]  KeywordAnalyzer [@Andy52 went to school yesterday!]

10. What known apps use that?  Twitter  Linked In  My Space

11. That’s all, thanks!

Apache lucene - full text search

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