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[OpenStack Infra <1712684@xxxxxxxxxxxxxxxxxx>]

Fix proposed to branch: stable/pike
Review: https://review.openstack.org/496997

** Changed in: nova/pike
       Status: Triaged => In Progress

** Changed in: nova/pike
     Assignee: (unassigned) => Matt Riedemann (mriedem)

** Changed in: nova
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1712684

Title:
  allocations not immediately removed when instance is deleted

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) pike series:
  In Progress

Bug description:
  Based on code inspection and a discussion with mriedem on IRC, it
  appears that when deleting an instance in a pure-Pike cloud the
  allocations are not removed until the update_available_resource()
  periodic task calls ResourceTracker._update_usage_from_instances(),
  which calls _remove_deleted_instances_allocations().

  In a mixed Ocata/Pike cloud the allocation will be freed up
  immediately when _update_usage_from_instance() calls
  self.reportclient.update_instance_allocation().

  In the ServerMovingTests functional test we bypass this by forcing the
  periodic task to run before checking that the allocations have been
  removed.

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