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https://issues.apache.org/jira/browse/SOLR-2628?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13058241#comment-13058241
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Dawid Weiss commented on SOLR-2628:
-----------------------------------

I've talked about it a little bit with Bernd and indeed, it seems possible to 
reduce the size of in-memory data structures by an order of magnitude (or even 
two orders of magnitude, we shall see). I'm on vacation for the next week and 
on a business trip for another one after that, but I'll be on it once I come 
back home.

> use of FST for SynonymsFilterFactory and synonyms.txt
> -----------------------------------------------------
>
>                 Key: SOLR-2628
>                 URL: https://issues.apache.org/jira/browse/SOLR-2628
>             Project: Solr
>          Issue Type: New Feature
>          Components: Schema and Analysis
>    Affects Versions: 3.4, 4.0
>         Environment: Linux
>            Reporter: Bernd Fehling
>            Assignee: Dawid Weiss
>            Priority: Minor
>              Labels: suggestion
>
> 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 synonyms.
> A tool can compile the synoynms.txt file to a binary automaton file which can 
> then be used
> with SynoynmsFilterFactory.
> Advantage:
> - faster start of solr, no need to generate SynonymsMap
> - faster lookup
> - memory saving

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