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[melanie witt <1904446@xxxxxxxxxxxxxxxxxx>]

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

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

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

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https://bugs.launchpad.net/bugs/1904446

Title:
  'GetPMEMNamespacesFailed' is not a valid exception

Status in OpenStack Compute (nova):
  In Progress
Status in OpenStack Compute (nova) train series:
  New
Status in OpenStack Compute (nova) ussuri series:
  New
Status in OpenStack Compute (nova) victoria series:
  New

Bug description:
  Attempting to retrieve a non-existent PMEM device results in the
  following traceback:

      ./nova-compute.log.1:2020-11-16 16:01:22.704 7 ERROR nova During handling of the above exception, another exception occurred:
      ./nova-compute.log.1:2020-11-16 16:01:22.704 7 ERROR nova
      ./nova-compute.log.1:2020-11-16 16:01:22.704 7 ERROR nova Traceback (most recent call last):
      ./nova-compute.log.1:2020-11-16 16:01:22.704 7 ERROR nova   File "/usr/bin/nova-compute", line 10, in <module>
      ./nova-compute.log.1:2020-11-16 16:01:22.704 7 ERROR nova     sys.exit(main())
      ./nova-compute.log.1:2020-11-16 16:01:22.704 7 ERROR nova   File "/usr/lib/python3.6/site-packages/nova/cmd/compute.py", line 57, in main
      ./nova-compute.log.1:2020-11-16 16:01:22.704 7 ERROR nova     topic=compute_rpcapi.RPC_TOPIC)
      ./nova-compute.log.1:2020-11-16 16:01:22.704 7 ERROR nova   File "/usr/lib/python3.6/site-packages/nova/service.py", line 271, in create
      ./nova-compute.log.1:2020-11-16 16:01:22.704 7 ERROR nova     periodic_interval_max=periodic_interval_max)
      ./nova-compute.log.1:2020-11-16 16:01:22.704 7 ERROR nova   File "/usr/lib/python3.6/site-packages/nova/service.py", line 129, in __init__
      ./nova-compute.log.1:2020-11-16 16:01:22.704 7 ERROR nova     self.manager = manager_class(host=self.host, *args, **kwargs)
      ./nova-compute.log.1:2020-11-16 16:01:22.704 7 ERROR nova   File "/usr/lib/python3.6/site-packages/nova/compute/manager.py", line 571, in __init__
      ./nova-compute.log.1:2020-11-16 16:01:22.704 7 ERROR nova     self.driver = driver.load_compute_driver(self.virtapi, compute_driver)
      ./nova-compute.log.1:2020-11-16 16:01:22.704 7 ERROR nova   File "/usr/lib/python3.6/site-packages/nova/virt/driver.py", line 1911, in load_compute_driver
      ./nova-compute.log.1:2020-11-16 16:01:22.704 7 ERROR nova     virtapi)
      ./nova-compute.log.1:2020-11-16 16:01:22.704 7 ERROR nova   File "/usr/lib/python3.6/site-packages/oslo_utils/importutils.py", line 44, in import_object
      ./nova-compute.log.1:2020-11-16 16:01:22.704 7 ERROR nova     return import_class(import_str)(*args, **kwargs)
      ./nova-compute.log.1:2020-11-16 16:01:22.704 7 ERROR nova   File "/usr/lib/python3.6/site-packages/nova/virt/libvirt/driver.py", line 446, in __init__
      ./nova-compute.log.1:2020-11-16 16:01:22.704 7 ERROR nova     vpmem_conf=CONF.libvirt.pmem_namespaces)
      ./nova-compute.log.1:2020-11-16 16:01:22.704 7 ERROR nova   File "/usr/lib/python3.6/site-packages/nova/virt/libvirt/driver.py", line 477, in _discover_vpmems
      ./nova-compute.log.1:2020-11-16 16:01:22.704 7 ERROR nova     vpmems_host = self._get_vpmems_on_host()
      ./nova-compute.log.1:2020-11-16 16:01:22.704 7 ERROR nova   File "/usr/lib/python3.6/site-packages/nova/virt/libvirt/driver.py", line 512, in _get_vpmems_on_host
      ./nova-compute.log.1:2020-11-16 16:01:22.704 7 ERROR nova     raise exception.GetPMEMNamespacesFailed(reason=reason)
      ./nova-compute.log.1:2020-11-16 16:01:22.704 7 ERROR nova AttributeError: module 'nova.exception' has no attribute 'GetPMEMNamespacesFailed'
      ./nova-compute.log.1:2020-11-16 16:01:22.704 7 ERROR nova

  It seems there was a typo introduced when this code was added. The
  code referenced 'GetPMEMNamespacesFailed' but the exception, which has
  since been removed since it was "unused", was called
  'GetPMEMNamespaceFailed'.

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