Shalin Says…: Inside Solr: Improvements in Faceted Search Performance

Yonik Seeley recently implemented a new method for faceting which will be available in Solr 1.4 (yet to be released). It is optimized for faceting on multi-valued fields with large number of unique terms but relatively low number of terms per document. The new method has made a large improvement in performance for faceted search and has cut memory usage at the same time.