This bug does not exist on the master branch.
** Changed in: nova
Status: Triaged => Invalid
** Changed in: nova
Assignee: melanie witt (melwitt) => (unassigned)
** Changed in: nova/ocata
Assignee: (unassigned) => melanie witt (melwitt)
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https://bugs.launchpad.net/bugs/1783613
Title:
[ocata only] quota usage not decremented during boot/delete race
Status in OpenStack Compute (nova):
Invalid
Status in OpenStack Compute (nova) ocata series:
In Progress
Bug description:
A customer ran into a situation where, during rapid boot/delete
(parallel) requests to nova, they noticed that quota usage was not
decremented after deleting instances. So, the number of instances in
use did not match the quota usage (quota out-of-sync).
I noticed in the code that in the _delete_while_booting method, we
check for the presence of the build request and if it's found, we
delete it and we lookup the instance and commit the quota usage
decrement if we found the instance. However, we *don't* decrement the
quota usage via commit if we did not find the instance (after finding
the build request).
I think that's wrong because if we found the build request, we're in
the middle of booting, and if we don't find the instance after that,
it means conductor either a) didn't create the instance record yet or
b) deleted the instance record because it got BuildRequestNotFound
because we (compute/api) deleted the build request. In either case,
conductor isn't going to do anything to decrement the quota usage, so
we need to do it in compute/api.
I think the fix is to decrement the quota usage whether we find the
instance or not, after we successfully delete the build request.
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