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From Eric Bowman <ebow...@boboco.ie>
Subject Re: random n00b question
Date Tue, 15 Sep 2009 10:30:34 GMT
Mark Robson wrote:
> 2009/9/15 Matt Kydd <mk@storefu.com <mailto:mk@storefu.com>>
>
>     We need to persist the sessions and associated shopping baskets /
>     activity summaries somewhere and Cass seems like a good fit, without
>     the restrictions imposed by SQL there would be less necessity to purge
>     old sessions.
>
>
> Purging the old sessions in Cassandra would be nontrivial. Moreover, 
> as Cassandra doesn't give you consistency, it's a very bad session store.
>
> Also seeing as session data are typically very small (If they're not, 
> you have more problems), the motivation for storing them in Cassandra 
> would be little.
>
> Why not use a conventional database with some redundancy solution - 
> you'll get consistency and for the volumes of data that a web site - 
> even a very busy one - has in its sessions, it won't be a problem.

With regard to consistency, is it not possible with Cassandra to achieve 
"Session consistency" as described here: 
http://www.allthingsdistributed.com/2008/12/eventually_consistent.html

Or, if not possible, not worth it?

Thanks,
Eric




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