[openstack-dev] Climate Incubation Application
sylvain.bauza at bull.net
Mon Mar 3 12:42:35 UTC 2014
Thanks for your reply, I'll try to further explain.
Le 03/03/2014 05:33, Joe Gordon a écrit :
> On Sun, Mar 2, 2014 at 11:32 AM, Dina Belova <dbelova at mirantis.com> wrote:
>> Hello, folks!
>> I'd like to request Climate project review for incubation. Here is official
>> incubation application:
> I'm unclear on what Climate is trying to solve. I read the 'Detailed
> Description' from the link above, and it states Climate is trying to
> solve two uses cases (and the more generalized cases of those).
> 1) Compute host reservation (when user with admin privileges can
> reserve hardware resources that are dedicated to the sole use of a
> 2) Virtual machine (instance) reservation (when user may ask
> reservation service to provide him working VM not necessary now, but
> also in the future)
Climate is born from the idea of dedicating compute resources to a
single tenant or user for a certain amount of time, which was not yet
implemented in Nova: how as an user, can I ask Nova for one compute host
with certain specs to be exclusively allocated to my needs, starting in
2 days and being freed in 5 days ?
Albeit the exclusive resource lock can be managed on the Nova side,
there is currently no possibilities to ensure resource planner.
Of course, and that’s why we think Climate can also stand by its own
Program, resource reservation can be seen on a more general way : what
about reserving an Heat stack with its volume and network nested resources ?
> You want to support being able to reserve an instance in the future.
> As a cloud operator how do I take advantage of that information? As a
> cloud consumer, what is the benefit? Today OpenStack supports both
> uses cases, except it can't request an Instance for the future.
Again, that’s not only reserving an instance, but rather a complex mix
of resources. At the moment, we do provide way to reserve virtual
instances by shelving/unshelving them at the lease start, but we also
give possibility to provide dedicated compute hosts. Considering it, the
logic of resource allocation and scheduling (take the word as resource
planner, in order not to confuse with Nova’s scheduler concerns) and
capacity planning is too big to fail under the Compute’s umbrella, as it
has been agreed within the Summit talks and periodical threads.
From the user standpoint, there are multiple ways to integrate with
Climate in order to get Capacity Planning capabilities. As you perhaps
noticed, the workflow for reserving resources is different from one
plugin to another. Either we say the user has to explicitly request for
dedicated resources (using Climate CLI, see dedicate compute hosts
allocation), or we implicitly integrate resource allocation from the
Nova API (see virtual instance API hook).
We truly accept our current implementation as a first prototype, where
scheduling decisions can be improved (possibly thanks to some tight
integration with a future external Scheduler aaS, hello Gantt), where
also resource isolation and preemption must also be integrated with
subprojects (we’re currently seeing how to provision Cinder volumes and
Neutron routers and nets), but anyway we still think there is a (IMHO
big) room for resource and capacity management on its own project.
Hoping it's clearer now,
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