[openstack-dev] [placement][nova] Decision time on granular request groups for like resources

Balázs Gibizer balazs.gibizer at ericsson.com
Thu Apr 19 12:38:54 UTC 2018



On Thu, Apr 19, 2018 at 2:27 PM, Eric Fried <openstack at fried.cc> wrote:
> gibi-
> 
>>  Can the proximity param specify relationship between the 
>> un-numbered and
>>  the numbered groups as well or only between numbered groups?
>>  Besides that I'm +1 about proxyimity={isolate|any}
> 
> Remembering that the resources in the un-numbered group can be spread
> around the tree and sharing providers...
> 
> If applying "isolate" to the un-numbered group means that each 
> resource
> you specify therein must be satisfied by a different provider, then 
> you
> should have just put those resources into numbered groups.
> 
> If "isolate" means that *none* of the numbered groups will land on 
> *any*
> of the providers satisfying the un-numbered group... that could be 
> hard
> to reason about, and I don't know if it's useful.
> 
> So thus far I've been thinking about all of these semantics only in
> terms of the numbered groups (although Jay's `can_split` was
> specifically aimed at the un-numbered group).

Thanks for the explanation. Now it make sense to me to limit the 
proximity param to the numbered groups.

> 
> That being the case (is that a bikeshed on the horizon?) perhaps
> `granular_policy={isolate|any}` is a more appropriate name than 
> `proximity`.

The policy term is more general than proximity therefore the 
granular_policy=any query fragment isn't descriptive enough any more. 
</bikeshed>

gibi

> 
> -efried
> 
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