[openstack-dev] [OSLO][RPC] AMQP / ZeroMQ control_exchange vs port numbers

Eric Windisch eric at cloudscaling.com
Fri Apr 26 14:43:53 UTC 2013

I do want to see the removal/replacement of the *cast_to_server methods which are also, in a way, cross-project RPC.

Eric Windisch

On Friday, April 26, 2013 at 10:38 AM, Julien Danjou wrote:

> On Fri, Apr 26 2013, Russell Bryant wrote:
> > I'm trying to understand the proposal ... would this mean taking some
> > ceilometer code and making a notification driver with it that
> > re-formats notifications into the form you want them in?
> That's exactly what Ceilometer does since the beginning. It collects
> notifications, and build metrics out of this.
> > I'm still not feeling great about this. The fact that ceilometer
> > doubles the messaging load doesn't seem like a good justification for
> > crossing the line into cross-project rpc.
> I think we all already do cross-project RPC, it's just that all projects
> relies on HTTP rather than on oslo's RPC.
> For Ceilometer, we do envision HTTP to publish metrics too, but since we
> don't have it so far, and since that from a deployer point of view RPC
> is internal and makes sense, it doesn't shock me to use it for such a
> goal.
> > If consuming notifications, and then spitting data back out on the bus
> > is a scale issue then ... just don't do that?
> That would be the point of the notification driver, dividing by 2 what a
> service would have to emit.
> I don't there's point forcing people to send the notification to RPC.
> The notification system has driver for a good reason, so people can do
> whatever they want with them (send them, log them). Ceilometer goals is
> to build meters out of them and publish them to various system over
> various media. We do this currently by listening to notification on RPC,
> but there's no obligation nor gain to do that, and squeezing it would be
> a gain.
> But the notification drivers being a list, nothing prevents you to still
> send notification on the RPC either. :)
> -- 
> Julien Danjou
> ;; Free Software hacker ; freelance consultant
> ;; http://julien.danjou.info
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