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From lukai <>
Subject Re: potential query performance issue
Date Fri, 15 Mar 2013 18:49:19 GMT
I had implemented wand with solr/lucene. So far there is no performance
issue.  There is no native support for this functionality, you need to
implement it by yourself..

On Fri, Mar 15, 2013 at 10:09 AM, Lin Ma <> wrote:

> Hello guys,
> Supposing I have one million documents, and each document has hundreds of
> features. For a given query, it also has hundreds of features. I want to
> fetch most relevant top 1000 documents by dot product related features of
> query and documents (query/document features are in the same feature
> space).
> I am not sure how Lucene implement internally? If we have to go through all
> one million document to dot product the query, then I am concerning about
> the performance. Appreciate if anyone could confirm (1) how Lucene works
> internally for this use case (2) any smart ideas to make improvement for
> query efficiency to select top 1000 documents?
> thanks in advance,
> Lin

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