Re: [netconf] Adoption poll for draft-tgraf-netconf-yang-notifications-versioning

[Andy Bierman <[e-mail]>]

On Wed, May 17, 2023 at 1:42 AM Jürgen Schönwälder
<[e-mail]> wrote:

> All of this has been pointed out before and does not come as a
> surprise. So we should have a general answer how to handle the
> "damage" created by an NBC update of YANG that according to some does
> not even require a YANG version number change.
>
> That said, it nobody knows how to implement a server supporting
> multile versions of the same module yet, then we should not work
> on a specific solution for a specific use case.
>
>
What about the "MUST NOT" that prohibits this in a YANG 1.1 module:

https://www.rfc-editor.org/rfc/rfc7950#section-5.6.5

I do not like the solution in this notification draft but it is quite
possible to implement
multiple versions of monitoring instrumentation at once.  If there are
multiple applications using
a server, it is quite useful to be able to update them to the new
monitoring module
independently. Of course, a general solution is needed that works for Push
and Poll applications.

/js
>

Andy


>
> On Wed, May 17, 2023 at 07:45:07AM +0000, IGNACIO DOMINGUEZ
> MARTINEZ-CASANUEVA wrote:
> > Hi Jürgen,
> >
> > I do not know how it could be implemented, but I understand the new YANG
> module versioning may lead to this kind of scenarios. For example, a server
> implementing two revisions of the same module, one of them introducing
> breaking changes. Not sure if we may find such use cases, but my point was
> that YANG Push should be able to support them if needed.
> >
> > This said, I agree with you that the new YANG module versioning may
> trigger a cascade of extensions in many different areas, such as YANG
> library or NETCONF get operations as Andy pointed out. We may just hit a
> topic that will require a broader discussion across WGs.
> >
> > Many thanks,
> >
> > Best regards,
> > Nacho.
> >
> > From: Jürgen Schönwälder <[e-mail]>
> > Date: Wednesday, 17 May 2023 at 09:23
> > To: IGNACIO DOMINGUEZ MARTINEZ-CASANUEVA <
> [e-mail]>
> > Cc: Mahesh Jethanandani <[e-mail]>, netconf <
> [e-mail]>, netconf-chairs <[e-mail]>
> > Subject: Re: [netconf] Adoption poll for
> draft-tgraf-netconf-yang-notifications-versioning
> > On Wed, May 17, 2023 at 06:55:36AM +0000, IGNACIO DOMINGUEZ
> MARTINEZ-CASANUEVA wrote:
> > >
> > > This extension to YANG Push will enable telemetry scenarios where the
> server implements multiple module revisions.
> > >
> >
> > I think Andy's question was how it is possible to implements multiple
> > module revisions. Can you answer this?
> >
> > /js
> >
> > --
> > Jürgen Schönwälder              Constructor University Bremen gGmbH
> > Phone: [phone]         Campus Ring 1 | 28759 Bremen | Germany
> > Fax:   [phone]         <https://constructor.university/>
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> --
> Jürgen Schönwälder              Constructor University Bremen gGmbH
> Phone: [phone]         Campus Ring 1 | 28759 Bremen | Germany
> Fax:   [phone]         <https://constructor.university/>
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