Does field collapsing (with facet) reduce performance?

2011-01-17 Thread Andy 
Just wanted to know how efficient field collapsing is. And if there is a 
performance penalty, how big is it likely to be?

I'm interested in using field collapsing with faceting.

Thanks.

Re: Does field collapsing (with facet) reduce performance?

2011-01-17 Thread Markus Jelsma 
There is always CPU and RAM involved for every nice component you use. Just 
how much the penalty is depends completely on your hardware, index and type of 
query. Under heavy load it numbers will change.

Since we don't know your situation and it's hard to predict without 
benchmarks, you should really do the tests yourself.

 Just wanted to know how efficient field collapsing is. And if there is a
 performance penalty, how big is it likely to be?
 
 I'm interested in using field collapsing with faceting.
 
 Thanks.

Re: Does field collapsing (with facet) reduce performance?

2011-01-17 Thread Andy 
I understand that the specific figures differ for everybody.

I just wanted to see if anyone who has used this feature could share their 
experience. A ballpark figure -- e.g. 50% slowdown or 10 times slower -- would 
be helpful.


--- On Mon, 1/17/11, Markus Jelsma markus.jel...@openindex.io wrote:

 From: Markus Jelsma markus.jel...@openindex.io
 Subject: Re: Does field collapsing (with facet) reduce performance?
 To: solr-user@lucene.apache.org
 Cc: Andy angelf...@yahoo.com
 Date: Monday, January 17, 2011, 7:27 PM
 There is always CPU and RAM involved
 for every nice component you use. Just 
 how much the penalty is depends completely on your
 hardware, index and type of 
 query. Under heavy load it numbers will change.
 
 Since we don't know your situation and it's hard to predict
 without 
 benchmarks, you should really do the tests yourself.
 
  Just wanted to know how efficient field collapsing is.
 And if there is a
  performance penalty, how big is it likely to be?
  
  I'm interested in using field collapsing with
 faceting.
  
  Thanks.