[openstack-dev] [nova] nova hooks - document & test or deprecate?

Andrew Laski andrew at lascii.com
Mon Feb 29 17:23:09 UTC 2016

On Mon, Feb 29, 2016, at 12:12 PM, Dan Smith wrote:
> > In our continued quest on being more explicit about plug points it feels
> > like we should other document the interface (which means creating
> > stability on the hook parameters) or we should deprecate this construct
> > as part of a bygone era.
> > 
> > I lean on deprecation because it feels like a thing we don't really want
> > to support going forward, but I can go either way.
> Deprecate and remove, please. We've been removing these sorts of things
> over time, and nova hooks have been ignored in that process. But really,
> making them more rigid is going to get in the way over time, trying to
> continue to honor an interface that codifies internals at a certain
> point in time, and leaving them as-is will just continue to generate
> issues like the quoted bug.
> I don't "lean" on deprecation, I feel strongly that these should go away.

I've worked on a deployment that uses them heavily and would be impacted
by their removal. They are a very convenient place to put code that
should run based on Nova events but I have yet to see a usage that
couldn't have been implemented by having a service listen to
notifications and run that same code. However there is no service that
does this. So the only argument I can see for keeping them is that it's
more convenient to put that code into Nova rather than implement
something that listens for notifications. And that's not a convincing
argument to me.

So I agree with moving forward on deprecation and think that
notifications provide a suitable replacement for the functionality

> --Dan
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