[
https://issues.apache.org/jira/browse/LUCENE-1690?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12737107#action_12737107
]
Carl Austin commented on LUCENE-1690:
-------------------------------------
The cache in terminfosreader is for everything as you say. I do a lot of stuff
with terms, and those terms will get pushed out of this LRU cache very quickly.
I have a separate cache on my version of the MLT. This has the advantage of
those terms only being pushed out by other MLT queries, and not by everything
else I am doing that is not MLT related.
A lot of MLTs use the same terms, and I have a good size cache for it, meaning
most terms I use in MLT can be retrieved from there. Seeing as MLT in my
circumstance is one of the slower bits, this can give me a good advantage.
> Morelikethis queries are very slow compared to other search types
> -----------------------------------------------------------------
>
> Key: LUCENE-1690
> URL: https://issues.apache.org/jira/browse/LUCENE-1690
> Project: Lucene - Java
> Issue Type: Improvement
> Components: contrib/*
> 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.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
---------------------------------------------------------------------
To unsubscribe, e-mail: java-dev-unsubscr...@lucene.apache.org
For additional commands, e-mail: java-dev-h...@lucene.apache.org
