Open Stack

On Tue, 2012-05-01 at 23:05 +0200, Loic Dachary wrote:
> On 05/01/2012 06:13 PM, Mark McLoughlin wrote:
> > Hi Loic,
> >
> > On Mon, 2012-04-30 at 12:15 +0200, Loic Dachary wrote:
> >
> >> To prepare for the next meeting ( thursday 3rd, may 2012
> >> http://wiki.openstack.org/Meetings/MeteringAgenda ) I cleaned up and
> >> reorganized the Metering blueprint so that it ( hopefully )
> >> incorporates all the information temporarily stored in the etherpad
> >> ( http://etherpad.openstack.org/EfficientMetering revision 67 in case
> >> it is vandalized ).
> > I'm a bit late to the discussion, but some brief comments after reading
> > up on what you guys have done so far:
> >
> >   - big +1 on separating billing from metering; there's no need to 
> >     conflate the two problems and doing it this way will allow for a 
> >     bunch of different ideas to be tried around billing
> >
> >   - I'd prefer to avoid adding a new node agents, so +1 on building on
> >     the notifications system
> I would also prefer this option. I have a few concerns though:
> 
> a) adding too many messages to the existing message queues
> b) not all core components provide notifications
> c) convincing all components to agree on a unified approach to metering
> 
> Instead it might be more practical to implement node agents when
> necessary to complete a first implementation. That is, taking advice
> from core component developers and possibly run into problems as
> opposed to convincing core component developers to adopt an approach
> to metering that is not yet implemented anywhere.

I'd start with metering using the notifications which are already there.
I think that will get us a long way.

My impression is that the notifications system is intended to cover all
billable usage in at least Nova and Glance.

Cheers,
Mark.