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From Michael McCandless <luc...@mikemccandless.com>
Subject Re: Lucene Search Performance Analysis Workshop
Date Thu, 27 Aug 2009 11:06:35 GMT
On Thu, Aug 27, 2009 at 6:30 AM, Grant Ingersoll<gsingers@apache.org> wrote:

>> I am wondering... are new SOLR filtering features faster than standard
>> Lucene queries like
>> {query} AND {filter}???
>
> The new filtering features in Solr are just doing what Lucene started doing
> in 2.4 and that is using skipping when possible.  It used to be the case in
> both Lucene and Solr that the filter was only every applied after scoring
> but before insertion into the Priority Queue.  That is now fixed.

I think performance of filtering can still be further improved, within
Lucene... it's still very much a work in progress.

EG if a filter is random access (eg RAM resident as a bit set), which
I think for Solr is frequently the case (?), it ought to be applied
just like we now apply deleted documents (LUCENE-1536 is opened for
this).  This can result in sizable performance gains, especially for
more complex queries and no-so-dense filters.

Mike

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