Agreed - I’ll draft up a formal proposal in the next week or two and we can 
focus the discussion there.  Thanks for the feedback - this provides a good 
framework for implementation considerations.

- Joe
On Sep 10, 2014, at 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.
> -- 
> Russell Bryant
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