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On Tue, 9 Oct 2018 10:35:23 -0700, Melanie Witt wrote:
> On Tue, 9 Oct 2018 07:23:03 -0400, Jay Pipes wrote:
>> That explains where the source of the problem comes from (it's the use
>> of SELECT FOR UPDATE, which has been removed from Nova's quota-handling
>> code in the Rocky release).
> Small correction, the SELECT FOR UPDATE was removed from Nova's
> quota-handling code in the Pike release.

Elaboration: the calls to quota reserve/commit/rollback were removed in 
the Pike release, so with_lockmode('update') is not called for quota 
operations, even though the reserve/commit/rollback methods are still 
there for use by old (Ocata) computes during an Ocata => Pike upgrade. 
Then, the reserve/commit/rollback methods were removed in Queens once no 
old computes could be calling them.

-melanie