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Thanks Miguel for your feedback.

I'll definetely dig more into this.
Having a lot of messages broadcasted to all the neutron agents is not 
something you want especially in the context of femdc[1]. 

Best,

Matt

[1]: https://wiki.openstack.org/wiki/Fog_Edge_Massively_Distributed_Clouds

----- Mail original -----
> De: "Miguel Angel Ajo Pelayo" <majopela at redhat.com>
> À: "OpenStack Development Mailing List (not for usage questions)" <openstack-dev at lists.openstack.org>
> Envoyé: Mercredi 20 Septembre 2017 11:15:12
> Objet: Re: [openstack-dev] [neutron][oslo.messaging][femdc]Topic names for every resource type RPC endpoint
> 
> I wrote those lines.
> 
> At that time, I tried a couple a publisher and a receiver at that scale. It
> was the receiver side what crashed trying to subscribe, the sender was
> completely fine.
> 
> Sadly I don't keep the test examples, I should have stored them in github
> or something. It shouldn't be hard to replicate though if you follow the
> oslo_messaging docs.
> 
> 
> 
> On Wed, Sep 20, 2017 at 9:58 AM, Matthieu Simonin <matthieu.simonin at inria.fr
> > wrote:
> 
> > Hello,
> >
> > In the Neutron docs about RPCs and Callbacks system, it is said[1] :
> >
> > "With the underlying oslo_messaging support for dynamic topics on the
> > receiver
> > we cannot implement a per “resource type + resource id” topic, rabbitmq
> > seems
> > to handle 10000’s of topics without suffering, but creating 100’s of
> > oslo_messaging receivers on different topics seems to crash."
> >
> > I wonder if this statements still holds for the new transports supported in
> > oslo.messaging (e.g Kafka, AMQP1.0) or if it's more a design limitation.
> > I'm interested in any relevant docs/links/reviews on the "topic" :).
> >
> > Moreover, I'm curious to get an idea on how many different resources a
> > Neutron
> > Agent would have to manage and thus how many oslo_messaging receivers
> > would be
> > required (e.g how many security groups a neutron agent has to manage ?) -
> > at
> > least the order of magnitude.
> >
> > Best,
> >
> > Matt
> >
> >
> >
> > [1]: https://docs.openstack.org/neutron/latest/contributor/
> > internals/rpc_callbacks.html#topic-names-for-every-
> > resource-type-rpc-endpoint
> >
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