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[Eric Fried <efried@xxxxxxxxxx>]

Per hangout, we decided this bug is valid - that we would like to get
extra candidates involving shared RPs when those satisfy the request.

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

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https://bugs.launchpad.net/bugs/1724613

Title:
  AllocationCandidates.get_by_filters ignores shared RPs when the RC
  exists in both places

Status in OpenStack Compute (nova):
  Confirmed

Bug description:
  When both the compute node resource provider and the shared resource
  provider have inventory in the same resource class,
  AllocationCandidates.get_by_filters will not return an
  AllocationRequest including the shared resource provider.

  Example:

   cnrp { VCPU: 24,
          MEMORY_MB: 2048,
          DISK_GB: 16 }
   ssrp { DISK_GB: 32 }

   AllocationCandidates.get_by_filters(
       resources={ VCPU: 1,
                   MEMORY_MB: 512,
                   DISK_GB: 2 } )

  Expected:

   allocation_requests: [
       { cnrp: { VCPU: 1,
                 MEMORY_MB: 512,
                 DISK_GB: 2 } },
       { cnrp: { VCPU: 1,
                 MEMORY_MB: 512 }
         ssrp: { DISK_GB: 2 } },
   ]

  Actual:

   allocation_requests: [
       { cnrp: { VCPU: 1,
                 MEMORY_MB: 512,
                 DISK_GB: 2 } }
   ]

  I will post a review shortly that demonstrates this.

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