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Re: [netmod] Datastore leaf for yang instance data

Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de> Fri, 23 November 2018 15:49 UTC

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Date: Fri, 23 Nov 2018 16:49:51 +0100
From: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
To: Balázs Lengyel <balazs.lengyel@ericsson.com>
CC: Ladislav Lhotka <lhotka@nic.cz>, Martin Bjorklund <mbj@tail-f.com>, "netmod@ietf.org" <netmod@ietf.org>
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Subject: Re: [netmod] Datastore leaf for yang instance data
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On Fri, Nov 23, 2018 at 01:21:23PM +0000, Balázs Lengyel wrote:
>    BALAZS: "Instance data associated with a datastore" may mean many things,
>    that's why this relatively loose term is used. It may mean:
> 
>      * Data was read from that datastore
>      * Data is intended to be fed into that datastore
>      * Something else ???
> 
>    This can be useful if data is read from a datastore, but in a number of
>    cases it is not useful:
> 
>      * Preloading configuration data: datastore may be running or candidate.
>      * Preloading mixed config and state data: We do have state data that is
>        very stable and thus it is documented as instance data, and the
>        instance data file is actually used to feed the state data into the
>        SW. So datastore is: running, candidate + operational if NMDA is
>        supported or state datastore (whatever that is) if NMDA is not
>        supported
> 
>    regards Balazs
>

I do not buy this story. Your software needs to decide somehow what
instance data means. A config true leaf in candidate means something
different than the same config true leaf in running and this yet again
means something different than the same config true leaf in operational.

/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/>

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