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

Eric Fried openstack at fried.cc
Thu Apr 11 18:01:25 UTC 2019

> 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.

Nothing stops me from traiting an inventoryless provider today, right?

Do we actually need to involve numbered request groups? Does a concept
of required_in_tree=$trait_list satisfy the requirements?


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