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 _______________________________________________ OpenStack-dev mailing list [email protected] http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
