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On Wed, 18 Jul 2018 15:14:55 -0500, Matt Riedemann wrote:
> On 7/18/2018 1:13 PM, melanie witt wrote:
>>> Can we get rid of multi-create?  It keeps causing complications, and
>>> it already
>>> has weird behaviour if you ask for min_count=X and max_count=Y and only X
>>> instances can be scheduled.  (Currently it fails with NoValidHost, but
>>> it should
>>> arguably start up X instances.)
>> We've discussed that before but I think users do use it and appreciate
>> the ability to boot instances in batches (one request). The behavior you
>> describe could be changed with a microversion, though I'm not sure if
>> that would mean we have to preserve old behavior with the previous
>> microversion.
> Correct, we can't just remove it since that's a backward incompatible
> microversion change. Plus, NFV people*love*  it.

Sorry, I think I might have caused confusion with my question about a 
microversion. I was saying that to change the min_count=X and 
max_count=Y behavior of raising NoValidHost if X can be satisfied but Y 
can't, I thought we could change that in a microversion. And I wasn't 
sure if that would also mean we would have to keep the old behavior for 
previous microversions (and thus maintain both behaviors).

-melanie