Folks, note that this change basically changes ml2 driver API that was supposed 
to be stable (now drivers receive context objects instead of sqlalchemy 
sessions). I would like folks to chime in the review. I would also suggest to 
announce the change during the next team meetings.

> On 22 Nov 2016, at 18:09, Anna Taraday <akamyshnik...@mirantis.com> wrote:
> 
> Hello everyone! 
> I'm working on implementation new engine facade in Neutron. [1]   
> 
> 
> We have a number of functions that expect to get session as one the 
> arguments. Passing session is not correct and this prevents of usage new 
> enginefacade which expect context to be passed and session to be injected in 
> current context. And also when we use new enginefacade the concept of a 
> "subtransaction" is completely different. So, I made refactor patch for 
> Neutron [2].
>   As these changes affect other projects that use these functions, I propose 
> patches to fix them [3]. 
> 
> Kindly, please be aware of these changes.
> 
> 
> [1] - 
> https://blueprints.launchpad.net/neutron/+spec/enginefacade-switch
> [2] - https://review.openstack.org/#/c/398873/ 
> [4] - 
> https://review.openstack.org/#/q/message:%22Change+passing+session+to+context+in+segments+db+functions%22
> -- 
> Regards,
> Ann Taraday
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