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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

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

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

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https://bugs.launchpad.net/bugs/1721514

Title:
  test_driver_spawn_fail_when_unshelving_instance fluctuates

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

Bug description:
  The functional test test_driver_spawn_fail_when_unshelving_instance fluctuates at the following place:
  Captured traceback:
  2017-10-04 17:29:33.464455 | ~~~~~~~~~~~~~~~~~~~
  2017-10-04 17:29:33.464483 |     b'Traceback (most recent call last):'
  2017-10-04 17:29:33.464577 |     b'  File "/home/jenkins/workspace/gate-nova-tox-functional-py35-ubuntu-xenial/nova/tests/functional/test_servers.py", line 2664, in test_driver_spawn_fail_when_unshelving_instance'
  2017-10-04 17:29:33.464618 |     b"    {'vcpus': 0, 'ram': 0, 'disk': 0}, usages)"
  2017-10-04 17:29:33.464695 |     b'  File "/home/jenkins/workspace/gate-nova-tox-functional-py35-ubuntu-xenial/nova/tests/functional/test_servers.py", line 1117, in assertFlavorMatchesAllocation'
  2017-10-04 17:29:33.464733 |     b"    self.assertEqual(flavor['vcpus'], allocation['VCPU'])"
  2017-10-04 17:29:33.464816 |     b'  File "/home/jenkins/workspace/gate-nova-tox-functional-py35-ubuntu-xenial/.tox/functional-py35/lib/python3.5/site-packages/testtools/testcase.py", line 411, in assertEqual'
  2017-10-04 17:29:33.464849 |     b'    self.assertThat(observed, matcher, message)'
  2017-10-04 17:29:33.464931 |     b'  File "/home/jenkins/workspace/gate-nova-tox-functional-py35-ubuntu-xenial/.tox/functional-py35/lib/python3.5/site-packages/testtools/testcase.py", line 498, in assertThat'
  2017-10-04 17:29:33.464953 |     b'    raise mismatch_error'
  2017-10-04 17:29:33.464985 |     b'testtools.matchers._impl.MismatchError: 0 != 1'
  2017-10-04 17:29:33.464998 |     b''
  2017-10-04 17:29:33.465008 |

  It is because the test waits for the instance state to be set to
  SHELVED_OFFLOADED and then asserts that the allocation of the instance
  is deleted in Placement. But the compute/manager set the instance
  state _before_ it deletes that allocation so the test is racy.

  [1]
  http://logstash.openstack.org/#dashboard/file/logstash.json?query=message%3A%5C%22in%20test_driver_spawn_fail_when_unshelving_instance%5C%22

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