On Thu, Nov 3, 2016 at 3:04 PM, Joshua Harlow <harlo...@fastmail.com> wrote: > Jay Faulkner wrote: >>> >>> On Nov 3, 2016, at 11:27 AM, Joshua Harlow<harlo...@fastmail.com> wrote: >>> >>> Just as a followup from the summit, >>> >>> One of the sessions (the new lib one) had a few proposals: >>> >>> https://etherpad.openstack.org/p/ocata-oslo-bring-ideas >>> >>> And I wanted to try to get clear owners for each part (there was some >>> followup work for each); so just wanted to start this email to get the >>> thoughts going on what to do for next steps. >>> >>> *A hash ring library* >>> >>> So this one it feels like we need at least a tiny oslo-spec for and for >>> someone to write down the various implementations, what they share, what >>> they do not share (talking to swift, nova, ironic and others? to figure this >>> out). I think alexis was thinking he might want to work through some of that >>> but I'll leave it for him to chime in on that (or others feel free to also). >>> >>> This one doesn't seem very controversial and the majority of the work is >>> probably on doing some analysis of what exists and then picking a library >>> name and coding that up, testing it, and then integrating (pretty standard). >>> >> >> Ironic and Nova both share a hash ring implementation currently >> (ironic-conductor and nova-compute driver for ironic). It would be sensible >> to reuse this implementation, oslo-ify it, and have that code shared. >> >> I question the value of re-implementing something like this from scratch >> though. >> >> Thanks, >> Jay Faulkner >> OSIC >> > > Right I don't think the intention would be to implement it from scratch, but > to do some basic analysis of what exists (and think about and document the > patterns), and try to find the common parts (which likely involves renaming > some specific nova/ironic methods from what I see); especially if we can get > swift to perhaps (TBD) also use and contribute to this library.
As the person who copied that code into Nova, the Nova code is a strict subset of the Ironic code. Some of us talked to John Dickinson off-list, and it seems the Swift hash ring has very different use cases and very different implementation. I think we should focus on pulling the Nova/Ironic code out first, and then talking to Swift if we can also make it work for them (sounds like it's not helpful today). // jim __________________________________________________________________________ OpenStack Development Mailing List (not for usage questions) Unsubscribe: openstack-dev-requ...@lists.openstack.org?subject:unsubscribe http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev