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Solr (pronounced "solar") is an open source enterprise search platform, written in Java, from the Apache Lucene project. Its major features include full-text search, hit highlighting, faceted search, real-time indexing, dynamic clustering, database integration, NoSQL features〔http://searchhub.org/2012/05/21/solr-4-preview/〕 and rich document (e.g., Word, PDF) handling. Providing distributed search and index replication, Solr is designed for scalability and Fault tolerance.〔(What is Solr? )〕 Solr is the most popular enterprise search engine.〔(Ranking of Search Engines )〕 Solr runs as a standalone full-text search server. It uses the Lucene Java search library at its core for full-text indexing and search, and has REST-like HTTP/XML and JSON APIs that make it usable from most popular programming languages. Solr's external configuration allows it to be tailored to many types of application without Java coding, and it has a plugin architecture to support more advanced customization. Apache Lucene and Apache Solr are both produced by the same Apache Software Foundation development team since the two projects were merged in 2010. It is common to refer to the technology or products as Lucene/Solr or Solr/Lucene. == History == In 2004, Solr was created by Yonik Seeley at CNET Networks as an in-house project to add search capability for the company website. In January 2006, CNET Networks decided to openly publish the source code by donating it to the Apache Software Foundation.〔(Source code that CNET is granting to the ASF for the Solr project )〕 Like any new project at Apache Software Foundation it entered an incubation period which helped solve organizational, legal, and financial issues. In January 2007, Solr graduated from incubation status into a standalone top-level project (TLP) and grew steadily with accumulated features, thereby attracting a robust community of users, contributors, and committers. Although quite new as a public project, it powered several high-traffic websites.〔(Public Websites that use Solr )〕 In September 2008, Solr 1.3 was released with many enhancements including distributed search capabilities and performance enhancements among many others.〔(Solr 1.3 Announcement )〕 In January 2009, solr & enterprise search Yonik Seeley along with Grant Ingersoll and Erik Hatcher went on to launch Lucidworks (formerly Lucid Imagination), being the first company providing commercial support and training for Apache Solr search technologies. Since then, support offerings around Solr has been abundant.〔()〕 November 2009 saw the release of Solr 1.4. This version introduced enhancements in indexing, searching and faceting along with many other improvements such as Rich Document processing (PDF, Word, HTML), Search Results clustering based on Carrot2 and also improved database integration. The release also features many additional plug-ins.〔(Solr 1.4 Announcement )〕 In March 2010, the Lucene and Solr projects merged.〔(Lucene+Solr merger vote thread )〕 Solr became a Lucene sub project. Separate downloads continued, but the products were now jointly developed by a single set of committers. In 2011 the Solr version number scheme was changed in order to match that of Lucene. After Solr 1.4, the next release of Solr was labeled 3.1, in order to keep Solr and Lucene on the same version number.〔(Solr3.1 - Solr Wiki ). Wiki.apache.org (2013-05-16). Retrieved on 2013-07-21.〕 In October 2012 Solr version 4.0 was released, including the new SolrCloud feature.〔(Apache Lucene ). Lucene.apache.org. Retrieved on 2013-07-21.〕 2013 and 2014 saw a number of Solr releases in the 4.x line, steadily growing the feature set and improving reliability. In February 2015, Solr 5.0 was released,〔(Solr 5.0.0 release announcement )〕 the first release where Solr is packaged as a standalone application,〔()〕 ending official support for deploying Solr as a war. Solr 5.3 featured a built-in pluggable Authentication and Authorization framework. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Apache Solr」の詳細全文を読む スポンサード リンク
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