[openstack-dev] [nova] [placement] experimenting with extracting placement

Jay Pipes jaypipes at gmail.com
Mon Mar 13 15:17:53 UTC 2017

On 03/13/2017 11:13 AM, Dan Smith wrote:
> Interestingly, we just had a meeting about cells and the scheduler,
> which had quite a bit of overlap on this topic.
>> That said, as mentioned in the previous email, the priorities for Pike
>> (and likely Queens) will continue to be, in order: traits, ironic,
>> shared resource pools, and nested providers.
> Given that the CachingScheduler is still a thing until we get claims in
> the scheduler, and given that CachingScheduler doesn't use placement
> like the FilterScheduler does, I think we need to prioritize the claims
> part of the above list.
> Based on the discussion several of us just had, the priority list
> actually needs to be this:
> 1. Traits
> 2. Ironic
> 3. Claims in the scheduler
> 4. Shared resources
> 5. Nested resources
> Claims in the scheduler is not likely to be a thing for Pike, but should
> be something we do as much prep for as possible, and land early in Queens.
> Personally, I think getting to the point of claiming in the scheduler
> will be easier if we have placement in tree, and anything we break in
> that process will be easier to backport if they're in the same tree.
> However, I'd say that after that goal is met, splitting placement should
> be good to go.



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