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Le 11/02/2014 17:23, Yathiraj Udupi (yudupi) a écrit :
> Hi Dina,
>
> Thanks for note about Climate logic.  This is something that will be 
> very useful, when we will have to schedule from Nova multiple 
> instances (of potentially different flavors) as a single request.  If 
> the Solver Scheduler, can make a request to the Climate service to 
> reserve the resources soon after the placement decision has been made, 
> then the nova provisioning logic can handle the resource provisioning 
> using the climate reserved leases.  Regarding Solver Scheduler for 
> your reference, just sent another email about this with some pointers 
> about it.  Otherwise this is the blueprint - 
> https://blueprints.launchpad.net/nova/+spec/solver-scheduler
> I guess this is something to explore more and see how Nova 
> provisioning logic to work with Climate leases. Or this is something 
> that already works.  I need to find out more about Climate.
>
> Thanks,
> Yathi.
>


There are possibly 2 ways for creating a lease : either thru the CLI or 
by the python binding.

We implemented these 2 possibilities within the current Climate 0.1 
release :
  - a Nova extension plugin is responsible for creating the lease if a 
VM should be reserved (using the Climate pythonclient binding)
  - an user can request for reserving a compute host using the Climate 
python client directly

Both logics (VM and compute host) are actually referring to 2 distinct 
plugins in the Climate manager, so the actions are completely different.

Based on your use-case, you could imagine a call from the 
SolverScheduler to Climate for creating a lease containing multiple VM 
reservations, and either you would use the Climate VM plugin or you 
would use a dedicated plugin if your need is different.

I don't think that's a huge volume of work, as Climate already defines 
and implements the main features that you need.

-Sylvain
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