If you are already using Apache Solr 3.1, 3.2 or 3.3, it's strongly recommended you upgrade to 3.4.0 because of the index corruption bug on OS or computer crash or power loss (LUCENE-3418), now fixed in 3.4.0.

Solr 3.4.0 release highlights include

  • Bug fixes and improvements from Apache Lucene 3.4.0, including a
    major bug (LUCENE-3418) whereby a Lucene index could
    easily become corrupted if the OS or computer crashed or lost
    power.
  • SolrJ client can now parse grouped and range facets results
    (SOLR-2523).
  • A new XsltUpdateRequestHandler allows posting XML that's
    transformed by a provided XSLT into a valid Solr document
    (SOLR-2630).
  • Post-group faceting option (group.truncate) can now compute
    facet counts for only the highest ranking documents per-group.
    (SOLR-2665).
  • Add commitWithin update request parameter to all update handlers
    that were previously missing it. This tells Solr to commit the
    change within the specified amount of time (SOLR-2540).
  • You can now specify NIOFSDirectory (SOLR-2670).
  • New parameter hl.phraseLimit speeds up FastVectorHighlighter
    (LUCENE-3234).
  • The query cache and filter cache can now be disabled per request.
    See this wiki page
    (SOLR-2429).
  • Improved memory usage, build time, and performance of
    SynonymFilterFactory (LUCENE-3233).
  • Added omitPositions to the schema, so you can omit position
    information while still indexing term frequencies (LUCENE-2048).
  • Various fixes for multi-threaded DataImportHandler.

See the release notes for a more complete list of all the new features, improvements, and bugfixes.

As usual, the download is available here: http://www.apache.org/dyn/closer.cgi/lucene/solr/

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