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From Mark Miller <>
Subject Lucene 2.9 RC3 now available for testing
Date Wed, 09 Sep 2009 16:51:02 GMT
Hash: SHA1

Hello Lucene users,

On behalf of the Lucene dev community (a growing community far larger
than just the committers) I would like to announce the third release
candidate for Lucene 2.9.

Please download and check it out – take it for a spin and kick the
tires. If all goes well, we hope to release the final version of
Lucene 2.9 very shortly.

A handful of bug fixes and documentation improvements (mostly doc)
have been
incorporated since the last RC. The most wide reaching change is
likely the
switch to using the native lock factory by default.

While we generally try and maintain full backwards compatibility
between major versions, Lucene 2.9 has a variety of breaks that are
spelled out in the 'Changes in backwards compatibility policy' section
of CHANGES.txt.

We recommend that you recompile your application with Lucene 2.9
rather than attempting to “drop” it in. This will alert you to any
issues you may have to fix if you are affected by one of the backward
compatibility breaks. As always, its a really good idea to thoroughly
read CHANGES.txt before upgrading. Also, remember that this is a
release candidate, and not the final Lucene 2.9 release.

Lucene 2.9 comes with a bevy of new features, including:

  * Per segment searching and caching (can lead to much faster reopen
    among other things)

  * Near real-time search capabilities added to IndexWriter

  * New Query types

  * Smarter, more scalable multi-term queries (wildcard, range, etc)

  * A freshly optimized Collector/Scorer API

  * Improved Unicode support and the addition of Collation contrib

  * A new Attribute based TokenStream API

  * A new QueryParser framework in contrib with a core QueryParser
    replacement impl included.

  * Scoring is now optional when sorting by Field, or using a custom
    Collector, gaining sizable performance when scores are not

  * New analyzers (PersianAnalyzer, ArabicAnalyzer,

  * New fast-vector-highlighter

  * Lucene now includes high-performance handling of numeric fields.
    Such fields are indexed with a trie structure, enabling simple to
    use and much faster numeric range searching without having to
    externally pre-process numeric values into textual values.


And many, many more features, bug fixes, optimizations, and various
improvements. You can find the full list of changes here:

HTML version:

Text version:

Many changes have also occurred in Lucene's Contrib area:

HTML version:

Text version:

Download release candidate 3 here:

Be sure to report back with any issues you find!


Mark Miller
Version: GnuPG v1.4.9 (GNU/Linux)
Comment: Using GnuPG with Mozilla -


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