Java全文搜索框架，Lucene 5.3.0 发布

jopen 9年前

Lucene 是 apache 软件基金会一个开放源代码的全文检索引擎工具包，是一个全文检索引擎的架构，提供了完整的查询引擎和索引引擎，部分文本分析引擎。 Lucene 的目的是为软件开发人员提供一个简单易用的工具包，以方便的在目标系统中实现全文检索的功能，或者是以此为基础建立起完整的全文检索引擎。

Lucene 最初是由 Doug Cutting 所撰写的，是一位资深全文索引/检索专家，曾经是V-Twin 搜索引擎的主要开发者，后来在 Excite 担任高级系统架构设计师，目前从事于一些 INTERNET 底层架构的研究。他贡献出 Lucene 的目标是为各种中小型应用程式加入全文检索功能。

Lucene 5.3.0 发布，此版本值得关注的更新如下：

API 改进：PhraseQuery 和 BooleanQuery 不可变 

新特性：

  • Added a new org.apache.lucene.search.join.CheckJoinIndex class that can be used to validate that an index has an appropriate structure to run join queries 

  • Added a new BlendedTermQuery to blend statistics across several terms 

  • New common suggest API that mirrors Lucene's Query/IndexSearcher APIs for Document based suggester. 

  • IndexWriter can now be initialized from an already open near-real-time or non-NRT reader 

  • Add experimental range tree doc values format and queries, based on a 1D version of the spatial BKD tree, for a faster and smaller alternative to postings-based numeric and binary term filtering.  Range trees can also handle values larger than 64 bits.

Geo 相关特性和改进：

  • Added GeoPointField, GeoPointInBBoxQuery， GeoPointInPolygonQuery for simple "indexed lat/lon point in bbox/shape" searching

  • Added experimental BKD geospatial tree doc values format and queries, for fast "bbox/polygon contains lat/lon points"

  • Use doc values to post-filter GeoPointField hits that fall in boundary cells, resulting in smaller index， faster searches and less heap used for each query

优化：

  • Reduce RAM usage of FieldInfos, and speed up lookup by number, by using an array instead of TreeMap except in very sparse cases

  • Faster intersection of the terms dictionary with very finite automata, which can be generated eg. by simple regexp queries

  • Various bugfixes and optimizations since the 5.2.0 release.

下载：http://www.apache.org/dyn/closer.cgi/lucene/java/5.3.0