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From Eric Lubow <>
Subject Re: Cassandra users survey
Date Sat, 21 Nov 2009 18:19:37 GMT
At ShermansTravel, we already tested Cassandra and Tokyo Cabinet/Tokyo
Tyrant.  We are starting the implementation phase this week.  The issue with
Tokyo Cabinet for us was writes were too slow.  The issue with Cassandra was
that reads were a little slower than we'd like, but with some caching
(either eventually being built into Cassandra or with memcache in front of

We do a lot of mailings and we want to track who received what mailing, what
kind of mailing, and that when we segment the lists for mailings (in MySQL),
we need to check that the user hasn't received too many mailings of a
certain type over a certain period (get_slice).

We are also evaluating a social network usage similar to the way Facebook
and Digg use the Like concept.  We want to make recommendations on our site
based on what a user's network likes based on location.  We believe
(although we haven't started evaluating yet) that Cassandra will be the
method of storing/accessing this data as well.

As I mentioned earlier some caching would be nice and also (I believe this
was suggested earlier in the thread), a remove_by_slice method.  Also (and I
will likely end up writing some of these myself), some Nagios plugins to
check the health of Cassandra.

Thanks for the excellent product.


On Fri, Nov 20, 2009 at 4:17 PM, Jonathan Ellis <> wrote:

> Hi all,
> I'd love to get a better feel for who is using Cassandra and what kind
> of applications it is seeing.  If you are using Cassandra, could you
> share what you're using it for and what stage you are at with it
> (evaluation / testing / production)? Also, what alternatives you
> evaluated/are evaluating would be useful.  Finally, feel free to throw
> in "I'd love to use Cassandra if only it did X" wishes. :)
> I can start: Rackspace is using Cassandra for stats collection
> (testing, almost production) and as a backend for the Mail & Apps
> division (early testing).  We evaluated HBase, Hypertable, dynomite,
> and Voldemort as well.
> Thanks,
> -Jonathan
> (If you're in stealth mode or don't want to say anything in public,
> feel free to reply to me privately and I will keep it off the record.)

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