On 15/03/17 15:40 -0400, Doug Hellmann wrote:
Excerpts from Monty Taylor's message of 2017-03-15 04:36:24 +0100:On 03/14/2017 06:04 PM, Davanum Srinivas wrote: > Team, > > So one more thing popped up again on IRC: > https://etherpad.openstack.org/p/oslo.config_etcd_backend > > What do you think? interested in this work? > > Thanks, > Dims > > PS: Between this thread and the other one about Tooz/DLM and > os-lively, we can probably make a good case to add etcd as a base > always-on service.As I mentioned in the other thread, there was specific and strong anti-etcd sentiment in Tokyo which is why we decided to use an abstraction. I continue to be in favor of us having one known service in this space, but I do think that it's important to revisit that decision fully and in context of the concerns that were raised when we tried to pick one last time. It's worth noting that there is nothing particularly etcd-ish about storing config that couldn't also be done with zk and thus just be an additional api call or two added to Tooz with etcd and zk drivers for it.The fun* thing about working with these libraries is managing the interdependencies. If we're going to have an abstraction library that provides configuration options for seeing the backend, like we do in oslo.db and olso.messaging, then the configuration library can't use it or we have a circular dependency. Luckily, tooz does not currently use oslo.config. So, oslo.config could use tooz and we could create an oslo.dlm library with a shallow interface mapping config options to tooz calls to open connections or whatever we need from tooz in an application. Then apps could use oslo.dlm instead of calling into tooz directly and the configuration of the backend would be hidden from the application developer.
Replying here becasue I like the proposal, I like what Monty said and I also like what Doug said. Most of the issues and concerns have been covered in this thread and I don't have much else to add other than +1.
Doug * your definition of "fun" may be different than mine
Which is probably different than mine :) -- @flaper87 Flavio Percoco
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