** Also affects: nova/queens
Importance: Undecided
Status: New
** Also affects: nova/pike
Importance: Undecided
Status: New
** Changed in: nova/queens
Status: New => Fix Committed
** Changed in: nova/queens
Importance: Undecided => Medium
** Changed in: nova/queens
Assignee: (unassigned) => Chris Dent (cdent)
** Changed in: nova/pike
Status: New => In Progress
** Changed in: nova/pike
Importance: Undecided => Medium
** Changed in: nova/pike
Assignee: (unassigned) => Chris Dent (cdent)
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Engineering Team, which is subscribed to OpenStack Compute (nova).
https://bugs.launchpad.net/bugs/1775308
Title:
Listing placement usages (total or per resource provider) in a new
process can result in a 500
Status in OpenStack Compute (nova):
Fix Released
Status in OpenStack Compute (nova) pike series:
In Progress
Status in OpenStack Compute (nova) queens series:
Fix Committed
Bug description:
When requesting /usages or /resource_providers/{uuid}/usages it is
possible to cause a 500 error if placement is running in a multi-
process scenario and the usages query is the first request a process
has received. This is because the methods which provide UsageLists do
not _ensure_rc_cache, resulting in:
File
"/usr/lib/python3.6/site-packages/nova/api/openstack/placement/objects/resource_provider.py",
line 2374, in _from_db_object
rc_str = _RC_CACHE.string_from_id(source['resource_class_id'])
AttributeError: 'NoneType' object has no attribute 'string_from_id'
We presumably don't see this in our usual testing because any process
has already had other requests happen, setting the cache.
For now, the fix is to add the _ensure_rc_cache call in the right
places, but long term if/when we switch to the os-resource-class model
we can do the caching or syncing a bit differently (see
https://review.openstack.org/#/c/553857/ for an example).
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https://bugs.launchpad.net/nova/+bug/1775308/+subscriptions
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