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On 09/11/2014 04:51 PM, Matt Riedemann wrote:
> On 9/10/2014 6:00 PM, Russell Bryant wrote:
>> On 09/10/2014 06:46 PM, Joe Cropper wrote:
>>> Hmm, not sure I follow the concern, Russell.  How is that any different
>>> from putting a VM into the group when it’s booted as is done today?
>>>   This simply defers the ‘group insertion time’ to some time after
>>> initial the VM’s been spawned, so I’m not sure this creates anymore race
>>> conditions than what’s already there [1].
>>>
>>> [1] Sure, the to-be-added VM could be in the midst of a migration or
>>> something, but that would be pretty simple to check make sure its task
>>> state is None or some such.
>>
>> The way this works at boot is already a nasty hack.  It does policy
>> checking in the scheduler, and then has to re-do some policy checking at
>> launch time on the compute node.  I'm afraid of making this any worse.
>> In any case, it's probably better to discuss this in the context of a
>> more detailed design proposal.
>>
>
> This [1] is the hack you're referring to right?
>
> [1]
> http://git.openstack.org/cgit/openstack/nova/tree/nova/compute/manager.py?id=2014.2.b3#n1297

That's the hack *I* had in the back of my mind.

-jay