Open Stack

On Mon, Apr 29, 2013 at 10:26 AM, Mark McLoughlin <markmc at redhat.com> wrote:

> On Mon, 2013-04-29 at 09:43 -0400, Eric Windisch wrote:
> > > My I'm thinking of an exchange is simply that it's a namespace
> > > under which topics live:
> > >
> > >
> > The discussion we were having was that we should NOT expose the
> > control_exchange in the API unless we also expose the queue connection
> > mechanism. The reason is that the control_exchange is presently a
> > point of clean sharding between projects.
>
> Yes, I'm proposing the concept of "exchange" purely as a namespace for
> projects to keep their topics separated ... and allow multiple instances
> of the project share the same space by allowing the exchange name to be
> user configurable.
>
> > Each unique value of control_exchange can be safely sharded to a
> > separate broker or, in the case of ZeroMQ, to a separate rpc_zmq_port.
> > This latter point is important because it feeds back into the ipc_dir
> > discussion we had; Projects can have their own IPC directory if they
> > run on their own rpc_zmq_port.  Of course, sharding for RabbitMQ/Qpid
> > might also be useful...
>
> I don't think what I'm saying changes that. You can absolutely put each
> exchange on a separate broker.
>

It is difficult to do that using the current configuration schema, because
there are so many different options that have to be replicated for each
broker. So you end up with foo_exchange, foo_host, foo_port, etc. for every
service that you want to connect to. For ceilometer we just said that all
of the exchanges have to be on the same broker. For cells, I think they
reproduce the settings in the database.

Doug


>
> Cheers,
> Mark.
>
>
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