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From "Richard Marr (JIRA)" <>
Subject [jira] Commented: (LUCENE-1690) Morelikethis queries are very slow compared to other search types
Date Mon, 15 Jun 2009 17:08:07 GMT


Richard Marr commented on LUCENE-1690:

Sounds reasonable although that'll take a little longer for me to do. I'll have a think about

> Morelikethis queries are very slow compared to other search types
> -----------------------------------------------------------------
>                 Key: LUCENE-1690
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: contrib/*
>    Affects Versions: 2.4.1
>            Reporter: Richard Marr
>            Priority: Minor
>         Attachments: LUCENE-1690.patch
>   Original Estimate: 2h
>  Remaining Estimate: 2h
> The MoreLikeThis object performs term frequency lookups for every query.  From my testing
that's what seems to take up the majority of time for MoreLikeThis searches.  
> For some (I'd venture many) applications it's not necessary for term statistics to be
looked up every time. A fairly naive opt-in caching mechanism tied to the life of the MoreLikeThis
object would allow applications to cache term statistics for the duration that suits them.
> I've got this working in my test code. I'll put together a patch file when I get a minute.
From my testing this can improve performance by a factor of around 10.

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