Lucene and Solr 3.2

On 03 June 2011 Lucene and Solr commiters published a new, stable version of Lucene library and Solr search engine – both numbered 3.2. You should not expect revolution in terms of new functionalities, but there are few changes worth the look.


  1. Lucene
    • A new grouping module (available under lucene/contrib/grouping)
    • A IndexUpgrader tool that let’s you upgrade your index to the new format
    • NRTCachingDirectory implementation which caches small segments in RAM
    • A new Collector implementation, CachingCollector, which helps developing functionalities which requires more than one pass
  2. Solr
    • Ability to specify overwrite and commitWithin as request parameters when using the JSON update format
    • Improvements to UIMA integration and Carrot2 library integration
    • Performance improvements of highlighting functionality
    • Jar file containing test-framework
    • Improvements from Apache Lucene 3.2

The full list of changes in Lucene 3.2 can be found here. Solr 3.2 change list can be found here.

The newest version of Lucene library can be found at the following address: The newest version of Solr search engine can be found at the following address: So now, we should say “Thank you” and wait for the next major version.

This entry was posted on Sunday, June 5th, 2011 at 08:03 and is filed under About Lucene, About Solr. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.