Hi Team, I worked on nova quota statistics issue ( https://bugs.launchpad.net/nova/+bug/1284424) happenning when nova-* processes are restarted during removing instances and was able to reproduce it. For repro I used devstack and started nova-api and nova-compute in separate screen windows. For killing them I used ctrl+c. As I found this issue happened if nova-* processes are killed after instance was deleted but right before quota commit procedure finishes.
We discussed these results with Markus Zoeller and decided that even though killing nova processes is a bit exotic event, this still should be fixed because quotas counting affects billing and very important for us. So, we need to introduce some mechanism that will prevent us from reaching inconsistent states in terms of quotas. In other words, this mechanism should work in such a way that both instance create/remove operation and quota usage recount operation happened or not happened together. Any ideas how to do that properly? Kind regards, Dmitry
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