Re: [netmod] Fwd: New Version Notification for draft-ietf-netmod-yang-instance-file-format-00.txt

Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de> Tue, 06 November 2018 08:45 UTC

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Date: Tue, 6 Nov 2018 09:45:13 +0100
From: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
To: Joe Clarke <jclarke@cisco.com>
CC: =?utf-8?Q?Bal=C3=A1zs?= Lengyel <balazs.lengyel@ericsson.com>, "netmod@ietf.org" <netmod@ietf.org>
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Subject: Re: [netmod] Fwd: New Version Notification for draft-ietf-netmod-yang-instance-file-format-00.txt
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On Tue, Nov 06, 2018 at 01:51:36AM -0500, Joe Clarke wrote:
> On 11/6/18 01:36, Juergen Schoenwaelder wrote:
> > I agree that
> > 
> >         leaf datastore {
> >           type ds:datastore-ref;
> >           description  "The identity of the datastore for which
> >             the instance data is documented for config=true data nodes.
> >             The leaf MAY be absent in which case the running dtastore or
> >             if thats not writable, the candidate datastore is implied.
> > 
> >             For config=false data nodes always the operational
> >             data store is implied.";
> > 	}
> > 
> > is pretty confusing. It should be something like this:
> > 
> >         leaf datastore {
> >           type ds:datastore-ref;
> >           description  "The identity of the datastore holding
> >             the instance data. If the instance data is not associated
> > 	    with a datastore, then this leaf MUST be absent.";
> > 	}
> > 
> > I am against merging data from different datastores together, which
> > the last sentence of the original text seems to imply.
> 
> This is better.
> 
> In the case where the data does come from a datastore would this leaf
> need to be there?  Meaning, is there an assumption that when it's not
> present then the data did NOT come from a DS?

I would prefer to have the datastore leaf mandatory when data is
associated with a specific datastore. If we do not mandate this, we
need a way to distinguish "I do not know what this is" from "this is
not datastore instance data".
 
> And it seems like you could provide instance data from <operational> to
> merge ct and cf nodes even without merging DSes.

The <operational> datastore does contain ct and cf data and the ct
data is the ct data that is operationally used (which can be different
from the ct data in <intended>. We went through quite some pain to
sort all of this out as part of the NMDA work and this document should
be consistent with NMDA.

/js

-- 
Juergen Schoenwaelder           Jacobs University Bremen gGmbH
Phone: +49 421 200 3587         Campus Ring 1 | 28759 Bremen | Germany
Fax:   +49 421 200 3103         <https://www.jacobs-university.de/>