yonik at apache
Jul 25, 2008, 7:46 AM
Post #2 of 2
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Yes, pull out language:ENG language:FRA language:RUS into filters,
cache them, and re-use them across all queries.
In Lucene, see CachingWrapperFilter()
In Solr, use a separate fq (for filter query) parameter...
q=+topic:m&a +topic:earn +company:MSFT&fq=language:ENG
-Yonik
On Fri, Jul 25, 2008 at 7:36 AM, Robert Stewart
<Robert.Stewart[at]infongen.com> wrote:
> If I have a frequently queried field, which has a single value per document (such as language), how can I pre-cache all field values, such that the underlying query processing always uses memory cache (never disk i/o) for that particular field? I don't know if it is possible without some custom query processing, which may be difficult in my case.
>
> We have incoming ad-hoc Boolean queries, for instance:
>
> +topic:m&a +topic:earn +company:MSFT +language:(ENG FRA RUS)
>
>
> We have translated contents per-language, so frequently, the language clause may contain up to 30 language field values. The performance differences between:
>
> +topic:m&a +topic:earn +company:MSFT +language:(ENG FRA RUS)
>
> And
>
> +topic:m&a +topic:earn +company:MSFT
>
> Is very significant (mostly since language is OR clause).
>
> So is there some way to optimize query processing on a per-field basis, such that language clauses are processed more efficiently?
>
> Thanks
> Bob
>
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