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On 09/10/2013 04:58 PM, Mike Spreitzer wrote:
> First, I'm a newbie here, wondering: is this the right place for
> comments/questions on blueprints?  Supposing it is...

Yes, this is the right place.

> 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.

I'll let those driving this feature comment on this.  I just wanted to
confirm that you're in the right place.  :-)

-- 
Russell Bryant