atom feed4 messages in 2.9 RC1 now available for testing
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Mark MillerAug 27, 2009 3:17 pm 
Bogdan GhidireacAug 28, 2009 2:08 am 
Mark MillerAug 28, 2009 6:03 am 
Mark MillerAug 28, 2009 8:17 am 
Subject:Lucene 2.9 RC1 now available for testing
From:Mark Miller (
Date:Aug 27, 2009 3:17:54 pm


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 first 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 in a little over a week.

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 queries, including NumericRangeQuery and NumericRangeFilter – fast, highly scalable alternatives to RangeQuery/RangeFilter for numeric searches.

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

A freshly optimized Collector/Scorer API

Improved Unicode support

A new Attribute based TokenStream API

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


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:

Download release candidate 1 here:

Be sure to report back with any issues you find!