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From Thom Nelson <>
Subject Re: Cache BitSet or doc number?
Date Fri, 26 Oct 2007 21:10:22 GMT
Check out the HashDocSet from Solr, this is the best way to cache small 
sets of search results.  In general, the Solr BitSet/DocSet classes are 
more efficient than using the standard java.util.BitSet.  You can use 
these independent of the rest of Solr (though I recommend checking out 
Solr if you want to do complex caching).

- Thom

John Patterson wrote:
> Hi,
> I am thinking about caching search results for common queries and just want
> to check that for small numbers of results it would be better to store the
> doc number as ints or shorts than to store a Filter with a BitSet.  I guess
> if you results contain less than 1/32 or 1/16 of the number of documents
> then it would take less memory.
> Is there anything else to consider?
> Thanks,
> John

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