I see, and thank you very much Dan. Also thank you Markus for unreleased 
release notes.

Now I understand that it is not a plugin and unstable interface. And there is a 
new "use_neutron" option for configuring Nova to use Neutron as its network 
backend.

When we use Neutron, there are ML2 and ML3 plugins so that we can choose to use 
different backend providers to actually perform those network functions. For 
example, integration with ODL.

Shall we foresee a situation, where user can choose another network backend 
directly, e.g. ODL, ONOS? Under this circumstance, a stable plugin interface 
seems needed which can provide end users with more options and flexibility in 
deployment.

What do you think?

Thanks
Bin

-----Original Message-----
From: Dan Smith [mailto:[email protected]] 
Sent: Thursday, June 30, 2016 10:30 AM
To: OpenStack Development Mailing List (not for usage questions) 
<[email protected]>
Subject: Re: [openstack-dev] [Nova] Deprecated Configuration Option in Nova 
Mitaka Release

> Just curious - what is the motivation of removing the plug-ability 
> entirely? Because of significant maintenance effort?

It's not a plugin interface and has never been stable. We've had a long-running 
goal of removing all of these plug points where we don't actually expect people 
to write stable plugins.

If you want to write against an unstable internal-only API and chase every 
little change we make to it, then just patch the code locally.
Using these plug points is effectively the same thing.

--Dan

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