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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

@Henry, if you need to cleanup placement, there is the osc-placement CLI
plugin available for some of this:

https://docs.openstack.org/osc-placement/latest/index.html

i.e. you can remove allocations for a given consumer (deleted instance)
if nova failed to cleanup allocations for that instance when it was
deleted. That's a workaround until we have a fix for this bug in nova.

** Also affects: nova/queens
   Importance: Undecided
       Status: New

** Changed in: nova/queens
       Status: New => Confirmed

** Changed in: nova/queens
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1679750

Title:
  Allocations are not cleaned up in placement for instance 'local
  delete' case

Status in OpenStack Compute (nova):
  Confirmed
Status in OpenStack Compute (nova) pike series:
  Confirmed
Status in OpenStack Compute (nova) queens series:
  Confirmed

Bug description:
  This is semi-related to bug 1661312 for evacuate.

  This is the case:

  1. Create an instance on host A successfully. There are allocation
  records in the placement API for the instance (consumer for the
  allocation records) and host A (resource provider).

  2. Host A goes down.

  3. Delete the instance. This triggers the local delete flow in the
  compute API where we can't RPC cast to the compute to delete the
  instance because the nova-compute service is down. So we do the delete
  in the database from the compute API (local to compute API, hence
  local delete).

  The problem is in #3 we don't remove the allocations for the instance
  from the host A resource provider during the local delete flow.

  Maybe this doesn't matter while host A is down, since the scheduler
  can't schedule to it anyway. But if host A comes back up, it will have
  allocations tied to it for deleted instances.

  On init_host in the compute service we call _complete_partial_deletion
  but that's only for instances with a vm_state of 'deleted' but aren't
  actually deleted in the database. I don't think that's going to cover
  this case because the local delete code in the compute API calls
  instance.destroy() which deletes the instance from the database
  (updates instances.deleted != 0 in the DB so it's "soft" deleted).

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