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[Chris Dent <cdent+lp@xxxxxxxxxxxxx>]

Apparently this was mostly expected, but not fully documented, so going
to invalidate the bug.

https://review.openstack.org/#/c/535642/

** Changed in: nova
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1743860

Title:
  allocation candidates db backend can handle traits but the HTTP front
  end is not turned on

Status in OpenStack Compute (nova):
  Invalid

Bug description:
  
  The code for /allocation_candidates is set up to be able to process a 'required' parameter alongside the 'resources' parameter. This results in a collection of RequestGroups which are used by the AllocationCandidates code in nova/objects/resource_provider.py

  But we can't request traits on /allocation_candidates because the json
  schema does not allow the 'required' parameter.

  Adding that results in a system that appears to work modulo at least
  one issue:

  * AllocationCandidates._get_by_requests raised ValueError on an
  unknown trait. It should probably raise TraitNotFound, which should be
  caught in the allocation_candidates handler. (There's also a raw
  ValueError related to sharing providers).

  Of course this doesn't address the nested situation, but that's in
  progress elsewhere.

  I have some wip code that demonstrates making it work, others should
  feel free to leap on this though as I will be out of touch for the
  next 4 days.

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