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Lucene and Solr 3.2

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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.

Changes:

  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: http://www.apache.org/dyn/closer.cgi/lucene/java/. The newest version of Solr search engine can be found at the following address: http://www.apache.org/dyn/closer.cgi/lucene/solr/. So now, we should say “Thank you” and wait for the next major version.

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