On Thu, 2014-05-01 at 20:49 +0800, Jay Lau wrote: > Jay Pipes and all, I'm planning to merge this topic to > http://junodesignsummit.sched.org/event/77801877aa42b595f14ae8b020cd1999 > after some discussion in this week's Gantt IRC meeting, hope it is OK.
I'll be there :) Thanks! -jay > > > 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 > > _______________________________________________ > OpenStack-dev mailing list > OpenStack-dev@lists.openstack.org > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev _______________________________________________ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
