Open Stack

First, I'm a newbie here, wondering: is this the right place for 
comments/questions on blueprints?  Supposing it is...

I am referring to 
https://blueprints.launchpad.net/nova/+spec/instance-group-api-extension

In my own research group we have experience with a few systems that do 
something like that, and more (as, indeed, that blueprint explicitly 
states that it is only the start of a longer roadmap).  I would like to 
highlight a couple of differences that alarm me.  One is the general 
overlap between groups.  I am not saying this is wrong, but as a matter of 
natural conservatism we have shied away from unnecessary complexities. The 
only overlap we have done so far is hierarchical nesting.  As the 
instance-group-api-extension explicitly contemplates groups of groups as a 
later development, this would cover the overlap that we have needed.  On 
the other hand, we already have multiple "policies" attached to a single 
group.  We have policies for a variety of concerns, so some can combine 
completely or somewhat independently.  We also have relationships (of 
various sorts) between groups (as well as between individuals, and between 
individuals and groups).  The policies and relationships, in general, are 
not simply names but also have parameters.

Thanks,
Mike
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