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From Raavan <valla...@gmail.com>
Subject Re: is OpenBitSet / SortedVIntList compressed bit map index?
Date Sat, 08 Jan 2011 18:17:50 GMT
Thanks Ryan. I will test this to see if it uses much less memory than
SortedVIntList.

-Raavan

On Fri, Jan 7, 2011 at 4:05 PM, Ryan Aylward <ryan@glassdoor.com> wrote:

> I don't recall how we decided to use it, but we are using
> http://code.google.com/p/compressedbitset/ and it seems to be pretty
> efficient in terms of memory.
>
> -----Original Message-----
> From: Federico Fissore [mailto:federico@fissore.org]
> Sent: Friday, January 07, 2011 3:12 PM
> To: java-user@lucene.apache.org
> Subject: Re: is OpenBitSet / SortedVIntList compressed bit map index?
>
> First Last, il 07/01/2011 20:55, ha scritto:
> > Hi,
> >
> > is OpenBitSet / SortedVIntList a compressed bit map index? Which one is
> > better if memory usage is the primary concern ?
> >
>
> SortedVIntList is compressed, OpenBitSet is not
>
>
> > Our filters are sparse. So is SortedVIntList better in that case?
> >
>
> Yes
>
>
> > Are there any other compressed bitmap index implementations which offer
> bit
> > map compression at a decent performance assuming filters are sparse?
> >
>
> I'm too looking for alternative implementations of compressed bitsets,
> so I'm too really interested in everybody experience: my primary concern
> at the moment is serializing bitsets to recover searcher warmup time
>
> I've tried some and roughly tested them: my conclusion was that we
> (lucene users) already stand on the rolls royce of bitset implementations.
>
> federico
>
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