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[Bug 1904446] [NEW] 'GetPMEMNamespacesFailed' is not a valid exception

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Public bug reported:

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'.

** Affects: nova
     Importance: Medium
         Status: Confirmed


** Tags: libvirt

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

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

** Tags added: libvirt

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

Title:
  'GetPMEMNamespacesFailed' is not a valid exception

Status in OpenStack Compute (nova):
  Confirmed

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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Follow ups

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