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On 7 May 2014 13:04, Mike Kolesnik <mkolesni at redhat.com> wrote:
> ----- Original Message -----

>> Yeah, we've already got plans in place to get Cinder to use the
>> interface to provide us more detailed information and eliminate some
>> polling. We also have a very purpose-built notification scheme between
>> nova and cinder that facilitates a callback for a very specific
>> scenario. I'd like to get that converted to use this mechanism as well,
>> so that it becomes "the way you tell nova that things it's waiting for
>> have happened."
>
> Not sure how you consider this "mechanism" something generic since it's
> facilitating only Nova while there might be a number of different services
> interested in this information.
> Now Neutron needs to be aware of VIF and Nova's expectations of Neutron
> in regards to that VIF, which is highly tightly coupled.
>
> Using a notification scheme where any subscriber can receive the event
> from Neutron/Cinder/etc and handle it how it needs instead would be
> much more decoupled, IMHO.

Nothing is merged on the cinder side yet, and won't be merging until
after the summit. Making an interface that is generic enough for any
entity that may wish to receive event notification from cinder is my
concern. The fact nova has already merged something that works for
neutron really isn't much of a concern for me - getting the right
interface into cinder is.