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[Mohammed Naser <1715462@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

When an instance fails the quota rechecks codebase which is here:

https://github.com/openstack/nova/blob/master/nova/conductor/manager.py#L992-L1006

It raises an exception, however, the cell mapping is only saved much
later (thanks help of dansmith for finding this):

https://github.com/openstack/nova/blob/master/nova/conductor/manager.py#L1037-L1043

This results in an instance with an unassigned cell, where it should
technically be the cell it was scheduled into.

** Affects: nova
     Importance: Undecided
         Status: New


** Tags: cells quotas

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https://bugs.launchpad.net/bugs/1715462

Title:
  Instances failing quota recheck end up with no assigned cell

Status in OpenStack Compute (nova):
  New

Bug description:
  When an instance fails the quota rechecks codebase which is here:

  https://github.com/openstack/nova/blob/master/nova/conductor/manager.py#L992-L1006

  It raises an exception, however, the cell mapping is only saved much
  later (thanks help of dansmith for finding this):

  https://github.com/openstack/nova/blob/master/nova/conductor/manager.py#L1037-L1043

  This results in an instance with an unassigned cell, where it should
  technically be the cell it was scheduled into.

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