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From Stanislav Jordanov <ste...@sirma.bg>
Subject Re: Querying performance decrease in 1.9.1 and 2.0.0
Date Wed, 22 Nov 2006 08:52:07 GMT
Paul,
We are working on delivering the next release by the end of the week so 
I have to take care of 2 or 3 issues before I try the nightly build.
I promise to try it and report the results here.

Best,
Stanislav

Paul Elschot wrote:
> Stanislav,
>
> Could you also try a nightly build to test the later performance improvement
> on BooleanScorer2?  The nightly builds are here:
> http://people.apache.org/builds/lucene/java/nightly/
> The jar is called lucene-core-nightly.jar in the .tar.gz build.
>
> It's not likely that this is faster than the 1.4 BooleanScorer, 
> but one never knows.
>
> Regards,
> Paul Elschot
>
>
> On Tuesday 21 November 2006 17:59, Yonik Seeley wrote:
>   
>> On 11/21/06, Stanislav Jordanov <stenly@sirma.bg> wrote:
>>     
>>> Switch to the old scorer (via BooleanQuery.setUseScorer14(true) )
>>> solved the performance issue - now Lucene 1.9.1 & 2.0.0 perform on the
>>> same load test just as 1.4.3 does
>>>
>>> Thanks a lot Yonik!
>>>
>>> Any chance there exists a non-professional explanation what's the
>>> difference between old and new boolean scorers?
>>>       
>> The original BooleanScorer was a bucket-based scorer that could
>> deliver docs out of order and thus restricted how it could be used.
>> It also had a limitation of 32 required or prohibited clauses (because
>> of an int bitmask).
>>
>> BooleanScorer2 removes these limitations, and uses skipTo() where
>> applicable on sub-scorers.
>>
>> -Yonik
>> http://incubator.apache.org/solr Solr, the open-source Lucene search server
>>
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>>
>>     
>
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>   


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