Thanks Jay Pipes! I see, but setting metadata for server group might be more flexible to handle all of the policy cases, such as hard affinity/anti-affinity, soft affinity/anti-affinity, topology affinity/anti-affinity etc, we may have more use cases in future related to server group metadata.
Regarding get rid of instance_group table, yes, it is a good idea for having "near", "not-near", "hard", and "soft", but it is a big change for current nova server group design, I'm not sure if we can have some clear conclusion in the coming one or two releases. Thanks! 2014-08-12 7:01 GMT+08:00 Jay Pipes <jaypi...@gmail.com>: > On 08/11/2014 05:58 PM, Jay Lau wrote: > >> I think the metadata in server group is an important feature and it >> might be used by >> https://blueprints.launchpad.net/nova/+spec/soft-affinity- >> for-server-group >> >> Actually, we are now doing an internal development for above bp and want >> to contribute this back to community later. We are now setting hard/soft >> flags in server group metadata to identify if the server group want >> hard/soft affinity. >> >> I prefer Dan's first suggestion, what do you think? >> ===================== >> If we care to have this functionality, then I propose we change the >> attribute on the object (we can handle this with versioning) and reflect >> it as "metadata" in the API. >> ===================== >> > > -1 > > If hard and soft is something that really needs to be supported, then this > should be a field in the instance_groups table, not some JSON blob in a > random metadata field. > > Better yet, get rid of the instance_groups table altogether and have > "near", "not-near", "hard", and "soft" be launch modifiers similar to the > instance type. IMO, there's really no need to store a named group at all, > but that goes back to my original ML post about the server groups topic: > > https://www.mail-archive.com/openstack-dev@lists.openstack. > org/msg23055.html > > Best, > -jay > > > _______________________________________________ > 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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