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From Michael Imbeault <>
Subject Re: MoreLikeThis class in Lucene within Solr?
Date Thu, 14 Sep 2006 03:31:18 GMT
Thanks for the answer; and try to enjoy your vacation / travel! Can't 
wait to be able to interface with MoreLikeThis within Solr!

Michael Imbeault
CHUL Research Center (CHUQ)
2705 boul. Laurier
Ste-Foy, QC, Canada, G1V 4G2
Tel: (418) 654-2705, Fax: (418) 654-2212

Erik Hatcher wrote:
> On Sep 12, 2006, at 3:41 PM, Michael Imbeault wrote:
>> I haven't looked at the specifics of how MoreLikeThis determine which 
>> items are similar; I'm mainly wondering about performance here. 
>> Yesterday I tried to code myself a poor man's similarity class (which 
>> was nothing more than doing a search with OR between words and 
>> sorting by score), and the performance was abysmal (well, I kinda 
>> expected it. 1000+ words queries on a 15 millions docs collection, 
>> you don't expect miracles). At first glance I think it searches for 
>> the most 'relevant' words, I'm I right? What kind of performance are 
>> you getting with it?
> Performance with MoreLikeThis is not an issue.  It has many parameters 
> to tune how many terms are used in the query it builds, and it pulls 
> these terms in an extremely efficient manner from the Lucene index.
> I'm doing some traveling soon, which is always a good time to hack on 
> something tractable like adding MoreLikeThis to Solr.  So your wish 
> may be granted in a week :)
>     Erik

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