Apache Solr 3.4发布，基于Lucene的开源搜索服务器

Apache Solr 3.4发布了。显然是为了配合Lucene 3.4而一起发布的。

Apache Solr是一个性能强大的，基于Lucene的全文搜索开源企业级搜索服务器，支持XML/HTTP、JSON APIs、命中结果突出显示、分面搜索（facet search）、缓存、复制和Web管理界面等诸多功能。Solr运行在Java servlet容器比如Tomcat中。

Solr 3.4主要改进：

• SolrJ client can now parse grouped and range facets results (SOLR-2523).
• A new XsltUpdateRequestHandler allows posting XML that's transformed by a provided XSLT into a valid Solr document (SOLR-2630).
• Post-group faceting option (group.truncate) can now compute facet counts for only the highest ranking documents per-group. (SOLR-2665).
• Add commitWithin update request parameter to all update handlers that were previously missing it. This tells Solr to commit the change within the specified amount of time (SOLR-2540).
• You can now specify NIOFSDirectory (SOLR-2670).
• New parameter hl.phraseLimit speeds up FastVectorHighlighter (LUCENE-3234).
• The query cache and filter cache can now be disabled per request. See this wiki page (SOLR-2429).
• Improved memory usage, build time, and performance of SynonymFilterFactory (LUCENE-3233).
• Added omitPositions to the schema, so you can omit position information while still indexing term frequencies (LUCENE-2048).
• Various fixes for multi-threaded DataImportHandler.

详细信息参阅：Solr 3.4.0 Release Note

建议使用早期版本的Apache Lucene和Solr用户都升级至3.4版。

下载地址：http://www.apache.org/dyn/closer.cgi/lucene/solr