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File:Lucene logo green 300.png
Developer(s) Apache Software Foundation
Stable release 3.0.0 (Java 5); 2.9.1 (Java 1.4) / November 25, 2009; 133374241 ago
Written in Java
Operating system Cross-platform
Type Search and index
License Apache License 2.0

Apache Lucene is a free/open source information retrieval software library, originally created in Java by Doug Cutting. It is supported by the Apache Software Foundation and is released under the Apache Software License.

Lucene has been ported to other programming languages including Delphi, Perl, C#, C++, Python, Ruby and PHP.



Lucene was originally written by Doug Cutting it was initially available for download from its home at the SourceForge web site. It joined the Apache Software Foundation’s Jakarta family of high-quality open source Java products in September 2001 and became its own top-level Apache project in February 2005. It now include a number of sub-projects Lucene Java, Droids, Lucene.Net, Lucy, Mahout, Solr, Nutch, Open Relevance Project, PyLucene and Tika

Lucene Java versions
Version Release Date Description
0.01 (initial release) March 2000 First open source release (SourceForge)
1.0 October 2000
1.01b July 2001 Last SourceForge release
1.2 June 2002 First Apache Jakarta release
1.3 December 2003 Compound index format, QueryParser enhancements, remote searching, token positioning, extensible scoring API
1.4 July 2004 Sorting, span queries, term vectors
1.4.1 August 2004 Bug fix for sorting performance
1.4.2 October 2004 IndexSearcher optimization and misc. fixes
1.4.3 29 November 2004 Misc. fixes
1.9.0 27 February 2006 Binary stored fields, DateTools, NumberTools, RangeFilter, RegexQuery, Require Java 1.4
1.9.1 2 March 2006 Bug fix in BufferedIndexOutput
2.0 26 May 2006 Removed deprecated methods
2.1 17 February 2007 Delete/update document in IndexWriter, locking simplifications, QueryParser improvements, contrib/benchmark
2.2 19 June 2007 Performance improvements, Function queries, Payloads, Preanalyzed fields, custom deletion policies
2.3.0 24 January 2008 Performance improvements, custom merge policies and merge schedulers, background merges by default, tool to detect index corruption, IndexReader.reopen
2.3.1 23 February 2008 Bug fixes from 2.3.0
2.3.2 06 May 2008 Bug fixes from 2.3.1
2.4.0 8 October 2008 Further performance improvements, transactional semantics (rollback, commit), expungeDeletes method, delete by query in IndexWriter
2.4.1 9 March 2009 Bug fixes from 2.4.0
2.9 25 September 2009 New per-segment Collector API, faster search performance, near real-time search, attribute based analysis
2.9.1 6 November 2009 Bug fixes from 2.9
3.0.0 (current release) 25 November 2009 Removed deprecated methods, fixed some bugs

Features and common use

While suitable for any application which requires full text indexing and searching capability, Lucene has been widely recognized[citation needed] for its utility in the implementation of Internet search engines and local, single-site searching.

At the core of Lucene's logical architecture is the idea of a document containing fields of text. This flexibility allows Lucene's API to be independent of the file format. Text from PDFs, HTML, Microsoft Word, and OpenDocument documents, as well as many others can all be indexed so long as their textual information can be extracted.

Lucene-based projects

Lucene itself is just an indexing and search library and does not contain crawling and HTML parsing functionality. The Apache project Nutch is based on Lucene and provides this functionality; the Apache project Solr is a fully-featured search server based on Lucene; Compass is a Java Search Engine Framework built on the top of Lucene. Liferay, the PANGAEA data library, and the EB-eye search engine (which specialises in biological information) are also based on Lucene.

See also



External links


es:Lucene fr:Lucene it:Lucene nl:Lucene ja:Lucene no:Lucene pt:Apache Lucene ru:Lucene th:ลูซีน vi:Lucene tr:Lucene zh:Lucene

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