[openstack-dev] [Ceilometer] [Metering] BP for new Ceilometer Agent(less) framework ...

Julien Danjou julien at danjou.info
Wed Jan 30 13:04:57 UTC 2013

On Tue, Jan 29 2013, Sandy Walsh wrote:

Hi Sandy,

> https://blueprints.launchpad.net/ceilometer/+spec/new-ceilometer-agent
> Full spec: http://wiki.openstack.org/NewCeilometerAgent
> Video walkthrough of the StackTach worker (basis for proposal): http://www.youtube.com/watch?v=thaZcHuJXhM
> (bump resolution and bandwidth, sorry for the um's)

What you propose is to drop the ceilometer-compute-agent, not the
central one, you should make this clearer I think.
Dropping the central one is just not going to happen anytime soon, but
that doesn't sound like a problem to me for now -- and it doesn't seem
it's a problem for you too.

IIUC your blueprint what you want to do is to retrieve data in a push
model from notifications sent by Nova, rather than polling Nova+libvirt.

As I already pointed out to you on IRC, this has already been discussed
back in November, the thread is at:


(I imagine you remember since it seems you participated)

As far as I know, what we have currently in the compute agent is an
implementation of the result of this thread, and Eoghan did the
necessary work on abstracting the virt driver etc on our side rather
than in Nova side.

Now, if your blueprint is about implementing the necessary components
into Nova to emit notifications with interesting information that
Ceilometer wants (e.g. instance CPU or I/O usage) and use them from
Ceilometer to drop the ceilometer-agent-compute, I don't think anybody
-- from the Ceilometer side -- will be against this since, IIRC,
Ceilometer crew were all for moving all the stuff into Nova back then.

What you may want to do to start is likely to create a blueprint in Nova
and get it validated. Changing stuff in Ceilometer then isn't likely to
be a problem; as you know, we already consume a lot of notifications.

Julien Danjou
# Free Software hacker & freelance
# http://julien.danjou.info
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