Nova hasn't used the quota usages table since Pike:
https://specs.openstack.org/openstack/nova-specs/specs/pike/implemented
/cells-count-resources-to-check-quota-in-api.html
** Changed in: nova
Status: Confirmed => Won't Fix
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Engineering Team, which is subscribed to OpenStack Compute (nova).
https://bugs.launchpad.net/bugs/1484343
Title:
Multiple record for same user and resource in quota_usage table
Status in Cinder:
Triaged
Status in OpenStack Compute (nova):
Won't Fix
Bug description:
Currently, the quota usage table doesn't contain UniqueConstraint
policy. Although it has locks when writing data, but under extreme
circumstance, for example: launching over 100 instances at the same
time for a new tenant(user). In this condition,the quota usage table
for this user is empty, and there might be a chance that multiple
record are recorded for same resource and same user.
Adding UniqueConstraint policy for this table can solve this problem.
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