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Posted to solr-user@lucene.apache.org by Andrew Nagy <an...@villanova.edu> on 2007/06/25 17:06:17 UTC

MoreLikeThis woes

Hello,  I have been playing off and on with the more like this patch and I really want to get it working well.  I have the patch installed and I have about 500K bibliographic records in my solr index.

My MLT query uses a fieldlist of about 5 or 6 fields.  There are a mix of string and text fields.  They are all in a TermVector.  I have played around with the mindf values.  With about 90% of my mlt queries solr it returns no matches and the remaining 10% get completely irrelevant results.

Are there any "best practices" for the MLT search or am I possibly doing something wrong?

Thanks
Andrew

Re: MoreLikeThis woes

Posted by Brian Whitman <br...@variogr.am>.

> My MLT query uses a fieldlist of about 5 or 6 fields.  There are a  
> mix of string and text fields.  They are all in a TermVector.  I  
> have played around with the mindf values.  With about 90% of my mlt  
> queries solr it returns no matches and the remaining 10% get  
> completely irrelevant results.

Set debugQuery on to see the generated query. Also try mlt.mintf=1 if  
your source fields are singleton-types.

Re: MoreLikeThis woes

Posted by Ryan McKinley <ry...@gmail.com>.

Andrew Nagy wrote:
> Hello,  I have been playing off and on with the more like this patch and I really want to get it working well.  I have the patch installed and I have about 500K bibliographic records in my solr index.
> 
> My MLT query uses a fieldlist of about 5 or 6 fields.  There are a mix of string and text fields.  They are all in a TermVector.  I have played around with the mindf values.  With about 90% of my mlt queries solr it returns no matches and the remaining 10% get completely irrelevant results.
> 
> Are there any "best practices" for the MLT search or am I possibly doing something wrong?
> 
> Thanks
> Andrew
> 

If you are using MLT on the standard request handler, try debugging with 
the MoreLikeThisRequestHandler (/mlt).

as brian suggests, set debugQuery to true and make sure the generated 
query looks ok.

also add "&mlt.displayTerms=details" to see what terms are getting used.

I'm not exactly sure what query gets constructed from 6 fields - you may 
find some wierdness if different tokenizers/analyzers.  Perhaps try MLT 
with 1 or two fields and see if the results make sense, them add more 
fields...