On 12/03/12 17:42, John Dickinson wrote: > > On Mar 10, 2012, at 5:58 AM, John Leach wrote: >> >> I think what I need here is hierarchical zones - I'd define one >> parent zone per data-centre, and then multiple child zones within >> each (representing racks or whatever). >> >> Swift would be configured to write 3 replicas in 3 child zones, >> aiming for at least 1 one replica per parent zone (handing off if >> the parent zone is unavailable). > > This would be a great feature for swift, and it's very much in line > with some things we've brainstormed about.
ah great, glad to know it's popping up on people's radars. >> I saw an oscon 2011 swift talk slide that mentioned "layered zones" >> as future dev work - mentioning "cabinets, not zones". >> Extrapolating from these 5 words, this is exactly what I need, when >> will it be ready? ;) >> >> Any thoughts on this? Can the existing Ring implementation be >> extended to do this kind of thing? Is the code modular enough to be >> able to make the Ring implementation pluggable? > > Beyond gholt's brimring (which you looked at earlier), I don't know > of any work that has been done on this. I certainly think that the > existing ring can be modified to handle these use cases, but it's not > really "pluggable" (beyond a replacement that supports the same > methods). I'd like to see the existing ring implementation expanded > for these use cases (and remain compatible with existing deployments) > rather than move to a plugin/extensions/whatever model. > > If you and others would like to work on these features, I think a > large part of the swift community would gratefully accept it. ah great, I'm currently looking at getting brimring working as a starting point. I can see how it might be easier to add this functionality to the existing ring though, without swapping it out completely. I'll drop a line back with any progress I make. Thanks! John. _______________________________________________ Mailing list: https://launchpad.net/~openstack Post to : openstack@lists.launchpad.net Unsubscribe : https://launchpad.net/~openstack More help : https://help.launchpad.net/ListHelp
