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From: Amin Mohammed-Coleman <aminmc@gmail.com>
To: "java-user@lucene.apache.org" <java-user@lucene.apache.org>
In-Reply-To: <D163392F17764C3E992E3E58E1770637@VEGA>
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Subject: Re: Performance tips on searching
Date: Fri, 20 Mar 2009 17:57:58 +0000
Cc: "<java-user@lucene.apache.org>" <java-user@lucene.apache.org>

Hi

I wrote last week about the best way to paginate. I will reply back  
with that email if that ok. This isn't my thread and I don't want to  
deviate from the original topic.


Cheers

Amin

On 20 Mar 2009, at 17:50, "Uwe Schindler" <uwe@thetaphi.de> wrote:

> No, the MultiSearcher also exposes all methods, IndexSearcher/Seracher
> exposes (it inherits it from the superclass IndexSearcher). And a  
> call to
> the collector is never sortable, because the sorting is done  
> *inside* the
> hit collector.
>
> Where is your problem with pagination? Normally you choose n to be
> paginationoffset+count and then display Scoredocs between n .. n 
> +count-1.
> There is no TopDocCollector that can only collect results 100 to  
> 109. To
> display results 100 to 109, you need to collect all results up to  
> 109, so
> call with n=110 and then display scoredoc[100]..scoredoc[109]
>
> This is exactly how the old Hits worked.
>
> -----
> Uwe Schindler
> H.-H.-Meier-Allee 63, D-28213 Bremen
> http://www.thetaphi.de
> eMail: uwe@thetaphi.de
>
>
>> -----Original Message-----
>> From: Amin Mohammed-Coleman [mailto:aminmc@gmail.com]
>> Sent: Friday, March 20, 2009 6:43 PM
>> To: java-user@lucene.apache.org
>> Cc: <java-user@lucene.apache.org>; <paul_t100@fastmail.fm>
>> Subject: Re: Performance tips on searching
>>
>> Hi
>>
>> How do you expose a pagination without a customized hit collector.  
>> The
>> multi searcher does not expose a method for hit collector and sort.
>> Maybe this is not an issue for people ...
>>
>> Cheers
>>
>> Amin
>>
>> On 20 Mar 2009, at 17:25, "Uwe Schindler" <uwe@thetaphi.de> wrote:
>>
>>> Why not use a MultiSearcher an all single searchers? Or a Searcher
>>> on a
>>> MultiReader consisting of all IndexReaders? With that you do not
>>> need to
>>> merge the results.
>>>
>>> By the way: instead of creating a TopDocCollector, you could also  
>>> call
>>> directly,
>>>
>>> Searcher.search(Query query, Filter filter, int n, Sort sort)
>>> Searcher.search(Query query, Filter filter, int n)
>>>
>>> Filter can be null.
>>>
>>> It's shorter and if sorting is also involved, simplier to handle
>>> (you do not
>>> need to switch between ToDocCollector and TopFieldDocCollector).
>>>
>>> Important: With Lucene 2.9, the searches will be faster using this  
>>> API
>>> (because then each index segment uses an own collector).
>>>
>>> Uwe
>>>
>>>
>>> -----
>>> Uwe Schindler
>>> H.-H.-Meier-Allee 63, D-28213 Bremen
>>> http://www.thetaphi.de
>>> eMail: uwe@thetaphi.de
>>>
>>>> -----Original Message-----
>>>> From: Paul Taylor [mailto:paul_t100@fastmail.fm]
>>>> Sent: Friday, March 20, 2009 6:02 PM
>>>> To: java-user@lucene.apache.org
>>>> Subject: Performance tips on searching
>>>>
>>>>
>>>> Hi, my code receives a search query from the web, there are 5
>>>> different
>>>> searches that can be searched on - each index is searched with a
>>>> single
>>>> IndexSearcher referenced in a map. it parses then  performs the
>>>> search
>>>> and return the best 10 results, with scores readjusted over the
>>>> results
>>>> so that the best score returns 1.0. Am I performing the optiminal
>>>> search
>>>> methods to do what I want ?
>>>>
>>>> thanks Paul
>>>>
>>>>       IndexSearcher searcher = searchers.get(indexName);
>>>>       QueryParser parser = new QueryParser(indexName, analyzer);
>>>>       TopDocCollector collector = new TopDocCollector(10);
>>>>       try {
>>>>           searcher.search(parser.parse(query), collector);
>>>>       }
>>>>       catch (ParseException e) {
>>>>       }
>>>>       Results results = new Results();
>>>>       results.totalHits = collector.getTotalHits();
>>>>       TopDocs topDocs = collector.topDocs();
>>>>       ScoreDoc docs[] = topDocs.scoreDocs;
>>>>       float maxScore = topDocs.getMaxScore();
>>>>       for (int i = 0; i < docs.length; i++) {
>>>>           Result result = new Result();
>>>>           result.score = docs[i].score / maxScore;
>>>>           result.doc = searcher.doc(docs[i].doc);
>>>>           results.results.add(result);
>>>>       }
>>>>       return results;
>>>>
>>>> --- 
>>>> ------------------------------------------------------------------
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>>>
>>>
>>>
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>
>
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