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From Jonathan Ellis <>
Subject Re: Stateful Thrift/Avro API in 0.7 (set_keyspace)
Date Tue, 06 Jul 2010 16:00:09 GMT
Because stateful keyspace is semantically closer to how people use it:
one keyspace per application.

If Thrift allowed us to make the keyspace-per-method-call optional we
could go that route, but it does not.

On Tue, Jul 6, 2010 at 10:56 AM, Thomas Heller <> wrote:
> Hey,
> I wonder if there is any particular reasoning why the API
> (thrift/avro) will become stateful in 0.7? Granted it already is doing
> that for "login", but why is the keyspace argument moved to a stateful
> level?
> I wrote a ruby client to help me in my app development and while it
> currently just connects to one keyspace, I was planning to divide my
> data into several keyspaces since there are some parts of data where I
> want a higher RF and some where a low RF is just fine.
> In preparation for 0.7 I'd now refactor parts of my client to support
> stateful keyspace selection but I just wondered why this "stateful"
> path was chosen? Will set_keyspace() be an expensive operation?
> Cheers,
> /thomas
> PS:
> For the curious, my Client is available at:
> While fully functional I doubt it would be very useful too anyone else
> at this time.

Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support

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