Re: [netmod] datastore-specific constraints
Martin Bjorklund <mbj@tail-f.com> Thu, 13 December 2018 10:25 UTC
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Date: Thu, 13 Dec 2018 11:24:54 +0100
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To: lhotka@nic.cz
Cc: rwilton@cisco.com, janl@tail-f.com, netmod@ietf.org
From: Martin Bjorklund <mbj@tail-f.com>
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Subject: Re: [netmod] datastore-specific constraints
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Ladislav Lhotka <lhotka@nic.cz> wrote: > On Thu, 2018-12-13 at 09:51 +0100, Martin Bjorklund wrote: > > Ladislav Lhotka <lhotka@nic.cz> wrote: > > > On Wed, 2018-12-12 at 15:23 +0000, Robert Wilton wrote: > > > > Hi Lada, > > > > I basically agree with Jan's suggestion. > > > > I don't think that I would use a when statement for this scenario since > > you > > > > want a leaf to report the operational value that is in effect, and one of > > the > > > > aims of NMDA is to try and get the configured and operational value onto > > the > > > > same path wherever possible. > > > > But, I think that the question about validity of must statements is more > > > > interesting. RFC 8342 states that these can be violated in operational, > > but > > > > the intention is that the constraints in <operational> should generally > > apply > > > > (but never be actually checked by the server). In this case, it might be > > > > useful to be able to annotate a must statement to indicate that it only > > > > applies to configuration data and not operational data. > > > > > > Another option could be that "must" constraints on config data do not apply > > in > > > <operational>, whereas constraints on "config false" data serve as binding > > > guidelines for implementors. > > > > Not sure what "binding guideline" means, but note that RFC 8342 says > > for <operational>: > > > > <operational> SHOULD conform to any constraints specified in the data > > model, but given the principal aim of returning "in use" values, it > > is possible that constraints MAY be violated [...] > > According to the definition of SHOULD and MAY in RFC 2119, this sentence > contradicts itself. It should probably have been "may" then...? > > Only semantic constraints MAY be violated. These are the YANG > > "when", "must", "mandatory", "unique", "min-elements", and > > "max-elements" statements; and the uniqueness of key values. > > It is nice to see "when" listed among semantic constraints. Yeah, I was a bit surprised that this sentence classifies "when" as a semantic constraint... > Note, however, that > in sec. 8.1 of RFC 7950, "when" ended up among the constraints that > are true in > all data trees (despite my hefty protests in the past). Note that also uniqueness of keys is listed in 8.1 as true all data trees, but relaxed by 8342. /martin
- [netmod] datastore-specific constraints Ladislav Lhotka
- Re: [netmod] datastore-specific constraints Jan Lindblad
- Re: [netmod] datastore-specific constraints Robert Wilton
- Re: [netmod] datastore-specific constraints Reshad Rahman (rrahman)
- Re: [netmod] datastore-specific constraints Jan Lindblad
- Re: [netmod] datastore-specific constraints Ladislav Lhotka
- Re: [netmod] datastore-specific constraints Juergen Schoenwaelder
- Re: [netmod] datastore-specific constraints Martin Bjorklund
- Re: [netmod] datastore-specific constraints Ladislav Lhotka
- Re: [netmod] datastore-specific constraints Martin Bjorklund
- Re: [netmod] datastore-specific constraints Ladislav Lhotka
- Re: [netmod] datastore-specific constraints Robert Wilton
- Re: [netmod] datastore-specific constraints Ladislav Lhotka
- Re: [netmod] datastore-specific constraints Randy Presuhn