Jay Pipes and all, I'm planning to merge this topic to http://junodesignsummit.sched.org/event/77801877aa42b595f14ae8b020cd1999after some discussion in this week's Gantt IRC meeting, hope it is OK.
Thanks! 2014-05-01 19:56 GMT+08:00 Day, Phil <philip....@hp.com>: > > > > > > In the original API there was a way to remove members from the group. > > > This didn't make it into the code that was submitted. > > > > Well, it didn't make it in because it was broken. If you add an instance > to a > > group after it's running, a migration may need to take place in order to > keep > > the semantics of the group. That means that for a while the policy will > be > > being violated, and if we can't migrate the instance somewhere to > satisfy the > > policy then we need to either drop it back out, or be in violation. > Either some > > additional states (such as being queued for inclusion in a group, etc) > may be > > required, or some additional footnotes on what it means to be in a group > > might have to be made. > > > > It was for the above reasons, IIRC, that we decided to leave that bit > out since > > the semantics and consequences clearly hadn't been fully thought-out. > > Obviously they can be addressed, but I fear the result will be ... ugly. > I think > > there's a definite possibility that leaving out those dynamic functions > will look > > more desirable than an actual implementation. > > > If we look at a server group as a general contained or servers, that may > have an attribute that expresses scheduling policy, then it doesn't seem to > ugly to restrict the conditions on which an add is allowed to only those > that don't break the (optional) policy. Wouldn't even have to go to the > scheduler to work this out. > > > _______________________________________________ > OpenStack-dev mailing list > OpenStack-dev@lists.openstack.org > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev > -- Thanks, Jay
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