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[placement][nova][ptg] Resourceless trait filters



On Wed, Apr 10, 2019 at 5:37 PM, Eric Fried <openstack at fried.cc> wrote:
>>  So we have a specific use case: COMPUTE_TRUSTED_CERTS + NUMA 
>> requires
>>  placement to support traits on RPs that are not providing resources.
>>  Will in this case VCPU and MEMORY_MB always requested in the 
>> unnumbered
>>  group still? Or there are cases when those resources are requested 
>> in a
>>  numbered group?
> 
> That'll depend on the outcome of the various NUMA modeling 
> discussions;
> but as soon as we need to be able to request resources from more than
> one NUMA node, it seems certain that we'll need to use numbered 
> groups.


Then we need two steps:
1) handle RPs that only have traits but not resources
2) allow having the numbered request groups specify only a trait 
without requesting resources.

Cheers,
gibi

> 
> efried
> .
>