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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

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

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

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

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

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

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

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

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Engineering Team, which is subscribed to OpenStack Compute (nova).
https://bugs.launchpad.net/bugs/1721179

Title:
  A cell cannot be deleted once a host is added to the cell

Status in OpenStack Compute (nova):
  In Progress
Status in OpenStack Compute (nova) ocata series:
  Confirmed
Status in OpenStack Compute (nova) pike series:
  Confirmed

Bug description:
  Description
  ===========

  In cell v2 environment, once a host is added to a cell,
  the cell cannot be deleted even though the cell does not have any hosts.

  Steps to reproduce
  ==================

  In cell v2 environment, a cell to delete has only one compute host.

  1. Delete the nova-compute service

  > nova service-delete db8e01f5-021d-4c87-a4eb-f3e5089e6105

  The records are soft deleted in the 'services' table and the 'compute_nodes' table of the cell database. 
  But the record in 'host_mappings' table of api database is not deleted.

  2. Delete the cell

  > nova-manage cell_v2 delete_cell --cell_uuid 0fcd92ba-b257-4fbc-94d5-9ac6a77ccf81
  There are existing hosts mapped to cell with uuid 0fcd92ba-b257-4fbc-94d5-9ac6a77ccf81.

  The command fails with the message above.
  It is caused because the host record remains in the 'host_mappings' table of api database.

  But there is no ways to delete the host record in the 'host_mappings'
  table.

  Expected result
  ===============

  The cell can be deleted if the cell does not have any hosts.
  Or we should have the way to delete the host from the cell.

  Actual result
  =============

  The cell cannot be deleted even though the cell does not have any hosts.
  (We don't have the way to delete the host from the cell.)

  Environment
  ===========

  OS: Ubuntu 16.04.2 LTS
  nova master(commit 8ca24bf1ff80f39b14726aca22b5cf52603ea5a0)

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