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[Chris Friesen <chris.friesen@xxxxxxxxxxxxx>]

Public bug reported:

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.

** Affects: nova
     Importance: High
         Status: Triaged


** Tags: compute pike-rc-potential placement scheduler

** Summary changed:

- allocations not immediately removed when instance deleted
+ allocations not immediately removed when instance is deleted

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

Title:
  allocations not immediately removed when instance is deleted

Status in OpenStack Compute (nova):
  Triaged

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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