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From "Bernd Fehling (JIRA)" <>
Subject [jira] [Created] (SOLR-2628) use of FST for SynonymsFilterFactory and synonyms.txt
Date Fri, 01 Jul 2011 07:40:28 GMT
use of FST for SynonymsFilterFactory and synonyms.txt

                 Key: SOLR-2628
             Project: Solr
          Issue Type: New Feature
          Components: Schema and Analysis
    Affects Versions: 3.4, 4.0
         Environment: Linux
            Reporter: Bernd Fehling
            Priority: Minor

Currently the SynonymsFilterFactory builds up a memory based SynonymsMap. 
This can generate huge maps because of the permutations for synonyms.

Now where FST (finite state transducer) is introduced to lucene this could also be used for
A tool can compile the synoynms.txt file to a binary automaton file which can then be used
with SynoynmsFilterFactory.

- faster start of solr, no need to generate SynonymsMap
- faster lookup
- memory saving

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