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[Jay Pipes <1683377@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

The resource provider generation is used to provide consistency
guarantees for concurrent changes to a provider's inventory/allocations.
Because right now, the nova-compute worker holds a lock for the duration
of any instance claim, we didn't have to pass a generation marker for
resource providers involved in allocations on a compute node (because
only one writer was allowed at a time).

With the move to claiming in the conductor, no such lock will be used
and we will want to pass the resource provider generation value that we
receive from GET /resource_providers to the PUT /allocations call that
the conductor makes.

Therefore, we should add the generation field to the request payload of
PUT /allocations

** Affects: nova
     Importance: Medium
     Assignee: Jay Pipes (jaypipes)
         Status: Triaged


** Tags: placement

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https://bugs.launchpad.net/bugs/1683377

Title:
  [placement] PUT /allocations should include resource provider
  generations

Status in OpenStack Compute (nova):
  Triaged

Bug description:
  The resource provider generation is used to provide consistency
  guarantees for concurrent changes to a provider's
  inventory/allocations. Because right now, the nova-compute worker
  holds a lock for the duration of any instance claim, we didn't have to
  pass a generation marker for resource providers involved in
  allocations on a compute node (because only one writer was allowed at
  a time).

  With the move to claiming in the conductor, no such lock will be used
  and we will want to pass the resource provider generation value that
  we receive from GET /resource_providers to the PUT /allocations call
  that the conductor makes.

  Therefore, we should add the generation field to the request payload
  of PUT /allocations

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