FAQ
I am about to evaluate Lucene for replacing
current IR system of Belgian Poison Center.

We are used to manage query refinements by
combining different searches with boolean
operators: we thus have to store the results
(or otherwise to remake them). Our current
software does this by paging compressed bit
sets on disk. I did not saw (up to now)
an object like Compressed BitSets in Lucene.

Browsing the web, I found a very interesting
class, near of what we currently use:
http://www.iis.uni-stuttgart.de/intset/

What Lucene's developpers think
about this issue ?

Thank you very much for your advice !

Christophe Dupriez
dupriez@destin.be








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  • Eks dev at Mar 9, 2006 at 1:26 pm
    Just a short one, it rocks in some cases (when actual
    BitSet/IntSet is compressable, long runs of set or
    clear bits...). Very good general BitSet
    representation

    I have tried it and found no bugs so far (+- 2 months
    of using it)

    Unfortunately, there is an issue with Licence (not ASF
    compatible :(

    cheers

    PS:
    To use something like that with Lucene you will hit
    the problem with Filter interface that suports only
    BitSet. It means you will have to wait a bit until
    more flexible Filter interface gets accepted by the
    comunity. Apart from that, I would not evaluate too
    much, just take Lucene, it is briliant ;)

    PS1: If you are interested in compressed bit sets, try
    to search for "utilities for compact sparse filters
    lucene"


    --- Dupriez Christophe wrote:
    I am about to evaluate Lucene for replacing
    current IR system of Belgian Poison Center.

    We are used to manage query refinements by
    combining different searches with boolean
    operators: we thus have to store the results
    (or otherwise to remake them). Our current
    software does this by paging compressed bit
    sets on disk. I did not saw (up to now)
    an object like Compressed BitSets in Lucene.

    Browsing the web, I found a very interesting
    class, near of what we currently use:
    http://www.iis.uni-stuttgart.de/intset/

    What Lucene's developpers think
    about this issue ?

    Thank you very much for your advice !

    Christophe Dupriez
    dupriez@destin.be








    ___________________________________________________________________________
    Nouveau : téléphonez moins cher avec Yahoo!
    Messenger ! Découvez les tarifs exceptionnels pour
    appeler la France et l'international.
    Téléchargez sur http://fr.messenger.yahoo.com

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    java-user-unsubscribe@lucene.apache.org
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  • Paul Elschot at Mar 9, 2006 at 6:35 pm
    On Thursday 09 March 2006 14:25, eks dev wrote:
    ...
    PS1: If you are interested in compressed bit sets, try
    to search for "utilities for compact sparse filters
    lucene"
    Or look here:

    http://issues.apache.org/jira/browse/LUCENE-328

    Regards,
    Paul Elschot


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postedMar 9, '06 at 12:17p
activeMar 9, '06 at 6:35p
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