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

Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de> Tue, 12 September 2017 11:18 UTC

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Date: Tue, 12 Sep 2017 13:18:07 +0200
From: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
To: Robert Wilton <rwilton@cisco.com>
Cc: Kent Watsen <kwatsen@juniper.net>, Lou Berger <lberger@labn.net>, netmod WG <netmod@ietf.org>
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Subject: Re: [netmod] WG Last Call: draft-ietf-netmod-revised-datastores-04
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On Tue, Sep 12, 2017 at 12:09:57PM +0100, Robert Wilton wrote:
> > 
> > There are several possible pitfalls here since (i) <operational> can
> > change anytime, (ii) it might not be easy/possible to obtain a
> > consistent snapshot of <operational>, and (iii) dynamic datastores can
> > provide values that "overwrite" <intended> and hence comparing values
> > may not really be sufficient. As long as the text is understood as
> > additional explanation and not used to write naive code to determine
> > how much of <intended> has been applied, it is fine. Otherwise, it
> > may be a source of future problems.
> One tweak could be to change "applied" to "in use":
> 
>    The contents of <intended> are related to the 'config true'
>    subset of <operational>, such that a client can determine to what
>    extent the intended configuration is currently in use by checking
>    whether the contents of <intended> also appear in <operational>.
> 
> Is this better?
>

I think this is better but the change does not address (i)-(iii) in
case someone uses this text to go and write naive code. But perhaps
nobody is ever going to do that. ;-)

/js

-- 
Juergen Schoenwaelder           Jacobs University Bremen gGmbH
Phone: +49 421 200 3587         Campus Ring 1 | 28759 Bremen | Germany
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