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Posted to dev@lucene.apache.org by "Erick Erickson (JIRA)" <ji...@apache.org> on 2013/04/13 23:16:16 UTC
[jira] [Commented] (LUCENE-1690) Morelikethis queries are very slow
compared to other search types
[ https://issues.apache.org/jira/browse/LUCENE-1690?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13631167#comment-13631167 ]
Erick Erickson commented on LUCENE-1690:
----------------------------------------
SPRING_CLEANING_2013 JIRAS Can anyone say if this is still valid?
> Morelikethis queries are very slow compared to other search types
> -----------------------------------------------------------------
>
> Key: LUCENE-1690
> URL: https://issues.apache.org/jira/browse/LUCENE-1690
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/other
> Affects Versions: 2.4.1
> Reporter: Richard Marr
> Priority: Minor
> Attachments: LruCache.patch, LUCENE-1690.patch, 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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