发布于 2017-10-18 00:53:26 | 215 次阅读 | 评论: 0 | 来源: 网友投递
Apache Lucene全文检索引擎工具包
Lucene是apache软件基金会4 jakarta项目组的一个子项目，是一个开放源代码的全文检索引擎工具包，即它不是一个完整的全文检索引擎，而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（英文与德文两种西方语言）。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 PMC 宣布发布了 Apache Lucene 7.1.0 和 Apache Solr 7.1.0
Lucene可从http://www.apache.org/dyn/closer.lua/lucene/java/7.1.0下载
Solr可从http://www.apache.org/dyn/closer.lua/lucene/solr/7.1.0下载
Lucene的更新亮点包括：
New Geo3D shapes for non-spherical planet models
Serialization and deserialization support for Geo3D
A new CoveringQuery, whose required number of matching clauses can be defined per document
New BengaliAnalyzer for Bengali language
A point based range field called LatLonBoundingBox
FloatPointNearestNeighbor, an N-dimensional FloatPoint K-nearest-neighbor search implementation
Faster default taxonomy cache
Support for computing facet counts for individual numeric values via LongValueFacetCounts
Faster geo-distance queries in case of dense single-valued fields when most documents match
Better heuristics in IndexOrDocValuesQuery
Optimized builds for OrdinalMap (used by SortedSetDocValuesFacetCounts and others)
Solr的更新亮点包括：
Critical Security Update: Fix for CVE-2017-12629 which is a working 0-day exploit reported on thepublic mailing list.
Auto-scaling: Solr can now move replicas automatically when a new node is added or an existing node is removed using the auto scaling policy framework introduced in 7.0
Auto-scaling: The 'autoAddReplicas' feature which was limited to shared file systems is now available for all file systems. It has been ported to use the new autoscaling framework internally.
Auto-scaling: New set-trigger, remove-trigger, set-listener, remove-listener, suspend-trigger, resume-trigger APIs
Auto-scaling: New /autoscaling/history API to show past autoscaling actions and cluster events
New JSON based Query DSL for Solr that extends JSON Request API to also support all query parsers and their nested parameters
JSON Facet API: min/max aggregations are now supported on single-valued date fields
Lucene's Geo3D (surface of sphere & ellipsoid) is now supported on spatial RPT fields by setting spatialContextFactory="Geo3D". Furthermore, this is the first time Solr has out of the box support for polygons
Expanded support for statistical stream evaluators such as various distributions, rank correlations, distances and more.
Multiple other optimizations and bug fixes
更多请点此查看。
Lucene CHANGES：https://lucene.apache.org/core/7_1_0/changes/Changes.html
Solr CHANGES：https://lucene.apache.org/solr/7_1_0/changes/Changes.html