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From Wikipedia, the free encyclopedia

Solr logo
Developer(s) Apache Software Foundation
Stable release 1.4.0 / 2009-11-10; 2 months ago
Written in Java
Operating system Cross-platform
Type Search and index API
License Apache License 2.0

Solr is an open source enterprise search server based on the Lucene Java search library, with XML/HTTP and JSON APIs, hit highlighting, faceted search, caching, replication, and a web administration interface.

It runs in a Java servlet container such as Apache Tomcat.



In late 2004, Solr was initially started and developed by CNET Networks as an in-house project to add search capability for the company website.

In early 2006, CNET Networks decided to go public and donate the source code to the Apache Software Foundation under the Lucene top-level project.[1] Like any new project at Apache Software Foundation it entered an incubation period which helped solve organizational, legal, and financial issues.

At the end of January 2007, Solr graduated from incubation status and grew steadily with accumulated features thereby attracting a robust community of users, contributors, and committers. Although quite new as a public project, it is already used for several high-traffic websites.[2]

In September 2008, Solr 1.3 was released with many enhancements including distributed search capabilities and performance enhancements among many others.[3]

November 2009 saw the release of Solr 1.4 This version introduces enhancements in indexing, searching and faceting along with many other improvements such as Rich Document processing (PDF, Word, HTML), Search Results clustering and also improved database integration. The release also features many additional plug-ins.[4]


  • Uses the Lucene library for full-text search
  • Faceted navigation
  • JSON, XML, PHP, Ruby, Python and custom Java binary output formats over HTTP
  • HTML administration interface
  • Replication to other Solr servers
  • Extensible through plugins
  • Distributed Search
  • Caching

See also



External links



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