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

Joe Clarke <jclarke@cisco.com> Tue, 06 November 2018 06:51 UTC

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From: Joe Clarke <jclarke@cisco.com>
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Date: Tue, 6 Nov 2018 01:51:36 -0500
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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 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?

And it seems like you could provide instance data from <operational> to
merge ct and cf nodes even without merging DSes.

Joe

> 
> /js
> 
> On Tue, Nov 06, 2018 at 11:51:26AM +0700, Ladislav Lhotka wrote:
>> Joe Clarke <jclarke@cisco.com> writes:
>>> ===
>>>
>>> Section 6
>>>
>>> With your datastore leaf, if I pull this off of a running YANG server,
>>> serialize it and share it with my customer, why wouldn't I have the
>>> actual datastore from which I retrieved it?  What I'm saying is that
>>> this element may be missing, but if it is, I don't think you can assume
>>> the source datastore for config=true nodes.
>>>
>>
>> The description of the "datastore" leaf doesn't make much sense to
>> me. It says that for configuration data the default is "running" or
>> "candidate" if "running" isn't writable. Why should it matter whether
>> "running" is writable? It looks like it is assumed that the config data will
>> eventually be fed into the indicated datastore, but I don't see any
>> reason for such an assumption.
>>
>> I can see that "datastore" can be occasionally useful as auxiliary
>> metadata but, in my view, this document addresses also instance data
>> that is not necessarily bound to any datastore.
>>
>> Lada
>>
>> -- 
>> Ladislav Lhotka
>> Head, CZ.NIC Labs
>> PGP Key ID: 0xB8F92B08A9F76C67
>>
>> _______________________________________________
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>