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Posted to java-user@lucene.apache.org by 齐保元 <qi...@126.com> on 2012/05/24 10:30:21 UTC
Lucene Grouping problem
Hi,there.I meet a problem to grouping the search result by time span and/or web site.Can Lucene's FirstPassGroupingCollector and SecondPassGroupingCollector work.Is there search performance problem under oceans of datas? Is is possible to group based on all Docs not top DOcs?Thanks guys/girls.
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____________________________________________
齐保元(Qi Baoyuan)
中科院计算技术研究所 智能信息处理重点实验室(ICT,NKI,GUCAS,Beijing,China)
手机：15120084688
E-Mail：qibaoyuan@126.com
Re: Lucene Grouping problem
Posted by Martijn v Groningen <ma...@gmail.com>.
If the time span or website (I assume you mean domain name) is a field
in your index then you can use result grouping.
Result grouping has impact on your query time and if you have a lot of
data you need to divide your data across multiple
indices and use distributed result grouping.
Martijn
On 24 May 2012 11:09, Ian Lea <ia...@gmail.com> wrote:
> I've never come across this GroupingCollector stuff before so know
> nothing about it apart from looking at the javadocs and may be talking
> nonsense, but here goes anyway.
>
> group by time span/web site: it appears that it will group by single
> values, not ranges, So should work fine by website. Just replace
> "author" in the example with "url" or whatever field you use. What
> exactly do you mean by time span? If you've got that stored in a
> field and want to group by single values I guess it would work.
>
> performance problem under oceans of data? Sure. Fast enough for you
> on your data? Who knows - try it and see.
>
> Group based on all docs? Don't see why not. The example in the
> javadocs uses a TermQuery. Try a MatchAllDocsQuery instead.
>
>
>
> --
> Ian.
>
>
> On Thu, May 24, 2012 at 9:30 AM, 齐保元 <qi...@126.com> wrote:
>> Hi,there.I meet a problem to grouping the search result by time span and/or web site.Can Lucene's FirstPassGroupingCollector and SecondPassGroupingCollector work.Is there search performance problem under oceans of datas? Is is possible to group based on all Docs not top DOcs?Thanks guys/girls.
>>
>>
>> --
>>
>> ____________________________________________
>> 齐保元(Qi Baoyuan)
>> 中科院计算技术研究所 智能信息处理重点实验室(ICT,NKI,GUCAS,Beijing,China)
>> 手机：15120084688
>> E-Mail：qibaoyuan@126.com
>
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--
Met vriendelijke groet,
Martijn van Groningen
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Re: Lucene Grouping problem
Posted by Ian Lea <ia...@gmail.com>.
I've never come across this GroupingCollector stuff before so know
nothing about it apart from looking at the javadocs and may be talking
nonsense, but here goes anyway.
group by time span/web site: it appears that it will group by single
values, not ranges, So should work fine by website. Just replace
"author" in the example with "url" or whatever field you use. What
exactly do you mean by time span? If you've got that stored in a
field and want to group by single values I guess it would work.
performance problem under oceans of data? Sure. Fast enough for you
on your data? Who knows - try it and see.
Group based on all docs? Don't see why not. The example in the
javadocs uses a TermQuery. Try a MatchAllDocsQuery instead.
--
Ian.
On Thu, May 24, 2012 at 9:30 AM, 齐保元 <qi...@126.com> wrote:
> Hi,there.I meet a problem to grouping the search result by time span and/or web site.Can Lucene's FirstPassGroupingCollector and SecondPassGroupingCollector work.Is there search performance problem under oceans of datas? Is is possible to group based on all Docs not top DOcs?Thanks guys/girls.
>
>
> --
>
> ____________________________________________
> 齐保元(Qi Baoyuan)
> 中科院计算技术研究所 智能信息处理重点实验室(ICT,NKI,GUCAS,Beijing,China)
> 手机：15120084688
> E-Mail：qibaoyuan@126.com
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