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*** As of June 2017, the latest Solr Ref Guide is located at https://lucene.apache.org/solr/guide ***

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codecFactory can be specified in solrconfig.xml to determine which Lucene Codec is used when writing the index to disk. 

If not specified, Lucene's default codec is implicitly used, but a solr.SchemaCodecFactory is also available which supports 2 key features:

  • Schema based per-fieldtype configuration for docValuesFormat and postingsFormat - see the Field Type Definitions and Properties section for more details.
  • compressionMode option:
    • BEST_SPEED (default) is optimized for search speed performance
    • BEST_COMPRESSION is optimized for disk space usage



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