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From mrevilgnome <mrevilgn...@gmail.com>
Subject Re: Bitmap indexes - reviving CASSANDRA-1472
Date Wed, 10 Apr 2013 21:40:20 GMT
What do you think about set manipulation via indexes in Cassandra? I'm
interested in answering queries such as give me all users that performed
event 1, 2, and 3, but not 4. If the answer is yes than I can make a case
for spending my time on C*. The only downside for us would be our current
prototype is in C++ so we would loose some performance and the ability to
dedicate an entire machine to caching/performing queries.


On Wed, Apr 10, 2013 at 11:57 AM, Jonathan Ellis <jbellis@gmail.com> wrote:

> If you mean, "Can someone help me figure out how to get started updating
> these old patches to trunk and cleaning out the Avro?" then yes, I've been
> knee-deep in indexing code recently.
>
>
> On Wed, Apr 10, 2013 at 11:34 AM, mrevilgnome <mrevilgnome@gmail.com>
> wrote:
>
> > I'm currently building a distributed cluster on top of cassandra to
> perform
> > fast set manipulation via bitmap indexes. This gives me the ability to
> > perform unions, intersections, and set subtraction across sub-queries.
> > Currently I'm storing index information for thousands of dimensions as
> > cassandra rows, and my cluster keeps this information cached, distributed
> > and replicated in order to answer queries.
> >
> > Every couple of days I think to myself this should really exist in C*.
> > Given all the benifits would there be any interest in
> > reviving CASSANDRA-1472?
> >
> > Some downsides are that this is very memory intensive, even for sparse
> > bitmaps.
> >
>
>
>
> --
> Jonathan Ellis
> Project Chair, Apache Cassandra
> co-founder, http://www.datastax.com
> @spyced
>

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