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From Steve Rowe <sar...@apache.org>
Subject [ANNOUNCE] Apache Lucene 4.1 released
Date Tue, 22 Jan 2013 16:21:50 GMT
January 2013, Apache Luceneā„¢ 4.1 available

The Lucene PMC is pleased to announce the release of Apache Lucene 4.1.

Apache Lucene is a high-performance, full-featured text search engine
library written entirely in Java. It is a technology suitable for nearly
any application that requires full-text search, especially cross-platform.

This release contains numerous bug fixes, optimizations, and
improvements, some of which are highlighted below. The release
is available for immediate download at:
   http://lucene.apache.org/core/mirrors-core-latest-redir.html

See the CHANGES.txt file included with the release for a full list of
details.

Lucene 4.1 Release Highlights:

 * Lucene 4.1 has a new default codec (Lucene41Codec) based on the
   previously-experimental "Block" indexing format for improved
   performance, but also incorporating the functionality of "Appending"
   and "Pulsing".

 * The default codec incorporates the optimization of Pulsing: terms
   that appear in only one document (such as primary key/id fields) just
   store the document id in the term dictionary instead of a pointer to
   this document id in a separate file.

 * The default codec incorporates an efficient compressed stored fields
   implementation that compresses chunks of documents together with LZ4.
   (see
   http://blog.jpountz.net/post/33247161884/efficient-compressed-stored-fields-with-lucene)

 * Lucene no longer seeks when writing files (all fields are written in
   an append-only way). This means it works by default with append-only
   streams, hdfs, etc.

 * New suggest implementations: AnalyzingSuggester, where the underlying
   form (computed from a lucene Analyzer) used for suggestions is
   separate from the returned text (see
   http://blog.mikemccandless.com/2012/09/lucenes-new-analyzing-suggester.html),
   and FuzzySuggester, which additionally allows for inexact matching on
   the input.

 * Near-realtime support was added to the facet module.
  (see http://shaierera.blogspot.com/2012/11/lucene-facets-part-1.html)

 * New Highlighter (postingshighlighter) added to the highlighter
   module.  (see
   http://blog.mikemccandless.com/2012/12/a-new-lucene-highlighter-is-born.html)

 * Added FilterStrategy to FilteredQuery for more flexibility in
   filtered query execution.

 * Added CommonTermsQuery to speed up queries with very highly frequent
   terms.  Term frequencies are efficiently detected at query time - no
   index time preparation required.

 * Several bugfixes and optimizations since the 4.0 release.

Please read CHANGES.txt for a full list of new features.

Please report any feedback to the mailing lists
(http://lucene.apache.org/core/discussion.html)

Note: The Apache Software Foundation uses an extensive mirroring network
for distributing releases.  It is possible that the mirror you are using
may not have replicated the release yet.  If that is the case, please
try another mirror.  This also goes for Maven access.

Happy searching,
Lucene/Solr developers
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