Re: [netmod] WG Last Call: draft-ietf-netmod-revised-datastores-04 duplicaiton

Lou Berger <lberger@labn.net> Wed, 13 September 2017 16:56 UTC

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To: "t.petch" <ietfc@btconnect.com>, netmod WG <netmod@ietf.org>
Cc: netmod-chairs@ietf.org, draft-ietf-netmod-revised-datastores@ietf.org
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From: Lou Berger <lberger@labn.net>
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Date: Wed, 13 Sep 2017 12:56:31 -0400
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Subject: Re: [netmod] WG Last Call: draft-ietf-netmod-revised-datastores-04 duplicaiton
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> I believe that text such as this would make the I-D much easier to
> follow.  As it stands, you have to read between the lines and speculate.
Tom,

    Thank you for the comments.  Do you have a specific change in mind,
or could your propose text, that would address this?

Thanks,
Lou

On 9/13/2017 12:42 PM, t.petch wrote:
> I think that in one respect, perhaps the key respect, this I-D fails to
> state the obvious (or at least what is likely obvious to those who have
> been at this for a while:-).
>
> The problem that is hinted at but never explicitly stated is that data
> objects can appear both as configuration and as state, e.g. when learned
> by other means or at other times.  The original model of datastores
> required these data objects to be modelled twice, as configuration false
> and as configuration true, and since there could be many of them, and
> the rules of YANG require them to be in separate trees, this led to a
> twin-trees approach such as can be seen in RFC7277 or RFC7223.
>
> Amongst other problems, this separation of operational state from
> configuration in a
>    separate branch in the data model has been found to be operationally
>    complicated and impacts the readability of module
>    definitions.  The relationship between
>    the branches is not machine readable and filter expressions operating
>    on configuration and on related operational state are different.
>
> With revised datastores, there is a single data object to model both
> values  but this now appears in two datastores, one for the
> configuration value, one for the operational state value.
>
> Instead of two YANG data nodes there is one data node in two datastores,
> a more elegant and simpler solution to the problem.
>
>
> I believe that text such as this would make the I-D much easier to
> follow.  As it stands, you have to read between the lines and speculate.
>
> Tom Petch
>
>
> ----- Original Message -----
> From: "Lou Berger" <lberger@labn.net>
> To: "netmod WG" <netmod@ietf.org>
> Cc: <netmod-chairs@ietf.org>;
> <draft-ietf-netmod-revised-datastores@ietf.org>
> Sent: Friday, September 01, 2017 10:02 PM
>
>> All,
>>
>> This starts a two week working group last call on
>> draft-ietf-netmod-revised-datastores-04.
>>
>> The working group last call ends on September 17.
>> Please send your comments to the netmod mailing list.
>>
>> Positive comments, e.g., "I've reviewed this document and
>> believe it is ready for publication", are welcome!
>> This is useful and important, even from authors.
>>
>> Thank you,
>> Netmod Chairs
>>
>> _______________________________________________
>> netmod mailing list
>> netmod@ietf.org
>> https://www.ietf.org/mailman/listinfo/netmod
>