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Release 3.4.1

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Carrot2 Project......
Carrot2: open source framework for building search clustering engines
The 3.4.1 release introduces a compatibility package for running newer versions of Carrot2 in Apache Solr 1.4.x and fixes an issue with clustering quality in Java and C# API and a number of other minor problems.
Updated clustering for Apache Solr 1.4.x. Solr 1.4.x comes with built-in search results clustering based on version 3.1.0 of Carrot2. Newer versions of Carrot2 can now be used with Solr 1.4.x through the Solr 1.4.x compatibility package this release provides. Please see Carrot2 manual for installation instructions.
Fix for degraded clustering quality in Java and C# API

The default configurations of version 3.4.0 of Carrot2 Java and C# API perform clustering without stemming, which may lead to degraded clustering quality. A drop-in upgrade from an earlier release to release 3.4.0 of Carrot2 JAR would also result in a similar clustering quality decrease.

Release 3.4.1 addresses this issue: Java and C# API perform clustering using the appropriate stemming engine, a drop-in upgrade of the Carrot2 JAR does not cause the clustering quality decrease.

Other tools, including Carrot2 Document Clustering Workbench, Carrot2 Document Clustering Server, Carrot2 Command Line Interface, Carrot2 Web Application and the Solr clustering component were not affected by this issue. For more details and a workaround for Carrot2 1.4.0, please see CARROT-723.


For a complete list of improvements and bug fixes, see JIRA issues fixed in version 3.4.1. For more new features, please see release 3.4.0 and release 3.3.0 notes.

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