Sylvain, I love your idea. As you said, that should be designed, but for the first sight your proposal looks quite nice.
On Thu, Mar 6, 2014 at 3:11 PM, Sylvain Bauza <sylvain.ba...@gmail.com>wrote: > Hi Thierry, > > > 2014-03-06 11:46 GMT+01:00 Thierry Carrez <thie...@openstack.org>: > > Dina Belova wrote: >> >> Would Climate also be usable to support functionality like Spot >> >> Instances ? "Schedule when spot price falls under X" ? >> > >> > Really good question. Personally I think that Climate might help >> > implementing this feature, but probably it's not the main thing that >> > will work there. >> > >> > Here are my concerns about it. Spot instances require way of counting >> > instance price: >> > [...] >> >> Not necessarily. It's a question of whether Climate would handle only >> "schedule at" (a given date), or more generally "schedule when" (a >> certain event happens, with date just being one event type). You can >> depend on some external system setting spot prices, or any other >> information, and climate rules that would watch regularly that external >> information to decide if it's time to run resources or not. I don't >> think it should be Climate's responsibility to specifically maintain >> spot price, everyone can come up with their own rules. >> >> > > I can't agree more on this. The goal of Climate is to provide some formal > contract agreement in betwen an user and the Reservation service, for > ensuring that the order will be placed and served correctly (with regards > to quotas and capacity). Of course, what we call 'user' doesn't formally > tend to be a 'real' user. > About spot instances use-case, I don't pretend to design it, but I could > easily imagine that a call to Nova for booting an instance would place an > order to Climate with a specific type of contract (what we began to call > 'best-effort' and which needs to be implemented yet) where notifications > for acquitting the order would come from Ceilometer (for instance). If no > notifications come to Climate, the lease would not be honored. > > See https://wiki.openstack.org/wiki/Climate#Lease_types_.28concepts.29 for > best-effort definition of a lease. > > -Sylvain > > > _______________________________________________ > OpenStack-dev mailing list > OpenStack-dev@lists.openstack.org > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev > > -- Best regards, Dina Belova Software Engineer Mirantis Inc.
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