Re: [netmod] schema-mount pre09 branch
Martin Bjorklund <mbj@tail-f.com> Tue, 06 February 2018 14:01 UTC
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Date: Tue, 06 Feb 2018 15:00:49 +0100
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To: rwilton@cisco.com
Cc: kwatsen@juniper.net, netmod@ietf.org, lhotka@nic.cz
From: Martin Bjorklund <mbj@tail-f.com>
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Subject: Re: [netmod] schema-mount pre09 branch
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Hi, Thanks for your comments, see inline. Robert Wilton <rwilton@cisco.com> wrote: > Hi, > > Some comments on the pre-09 version, particularly the data model. > > > 1) I still don't get why this draft is called "YANG Schema Mount" > rather than "YANG Mount", since to me this implies that it *only* the > schema that is being made available, and by implication not the > instance data. I.e. I can see what schema a VM is using, but I cannot > access the instance data of that VM. > > I understand the scope of the draft (and I'm not trying to change that > at all), and agree that it doesn't specify any protocol for how to > remotely mount data (e.g. peer mount). But my understanding of the > solution here is that it doesn't just mount the schema. I think that > it also always makes the mounted instance data available using the > regular NETCONF/RESTCONF operations right? Which sounds like it is > doing more than just mounting the schema! Once you have a mounted schema, even in the inline case, a server might be just a single normal server with no extra VMs or anything; you just have a nested schema. Such a server would allow you to use normal edit-config to add mounted data, and it would just affect that single server's database and instrumentation. The point is that schema mount says nothing about *how* things are instantiated. Peer mount, OTOH, attaches instance-specific meaning to its mount points - if you try to write to peer mounted data the server will act as a "proxy" and write to the remote server. (ok, current peer mount is defined to be read-only, but you get my point). > 2) Regarding the YANG Data Model: > > (i) Should "schema-mounts" just be "mounts", since it is already under > the "schema" container. I don't have a strong opinion on this. > (ii) Should "parent-references" be part of the "use-schema" container, > or should then be part of a schema directly. E.g. should schema-mount > augment yanglib:schema with both a "mounts" container and a > "parent-reference" leaflist. This would mean the same parent-references for all mount points in a schema, as opposed to per-mount-point parent-references as we have today. Lada, what's your opinion on this? > (iii) Do we definitely need the namespace list? Shouldn't the > prefixes/namespaces be resolved against the implemented modules in the > referenced schema, or is this not sufficient? If this is not > sufficient, I wonder if it would be helpful for the draft to describe > this. It is not sufficient b/c the only prefixes available from the implemented modules are the prefixes in the modules themselves, and they aren't necessarily unique. > (iv) I agree with Juergen that "inline" is a confusing term because it > is meaning that the mounted schema is available inline in the instance > data tree, not that it is inline in the schema tree. /martin > > Thanks, > Rob > > > On 31/01/2018 21:36, Kent Watsen wrote: > > All, > > > > The authors created a "pre09" branch on GitHub a few weeks back. On > > this branch, they completed a full update of the draft. While waiting > > for details on how to proceed with regards to a SM-bis, we thought it > > would be helpful to make this text available now so that the technical > > parts can be discussed. With this in mind, can folks please have a > > quick look and post any technical comments they have? > > > > > > The "txt" version of the draft: > > https://raw.githubusercontent.com/netmod-wg/schema-mount/pre09/draft-ietf-netmod-schema-mount-pre-09.txt > > > > > > rfcdiff against the current -08 draft: > > https://www.ietf.org/rfcdiff?url1=draft-ietf-netmod-schema-mount-08&url2=https://raw.githubusercontent.com/netmod-wg/schema-mount/pre09/draft-ietf-netmod-schema-mount-pre-09.txt > > > > > > Since rfc7895bis obsoletes RFC 7895, the > > server-must-implement-rfc7895bis requirement is no surprise, right? > > > > Thanks, > > Kent // shepherd > > > > > > _______________________________________________ > > netmod mailing list > > netmod@ietf.org > > https://www.ietf.org/mailman/listinfo/netmod > > . > > >
- [netmod] schema-mount pre09 branch Kent Watsen
- Re: [netmod] schema-mount pre09 branch Juergen Schoenwaelder
- Re: [netmod] schema-mount pre09 branch Martin Bjorklund
- Re: [netmod] schema-mount pre09 branch Robert Wilton
- Re: [netmod] schema-mount pre09 branch Robert Wilton
- Re: [netmod] schema-mount pre09 branch Martin Bjorklund
- Re: [netmod] schema-mount pre09 branch Juergen Schoenwaelder
- Re: [netmod] schema-mount pre09 branch Robert Wilton
- Re: [netmod] schema-mount pre09 branch Robert Wilton
- Re: [netmod] schema-mount pre09 branch Juergen Schoenwaelder
- Re: [netmod] schema-mount pre09 branch Martin Bjorklund
- Re: [netmod] schema-mount pre09 branch Juergen Schoenwaelder
- Re: [netmod] schema-mount pre09 branch Ladislav Lhotka
- Re: [netmod] schema-mount pre09 branch Robert Wilton
- Re: [netmod] schema-mount pre09 branch Ladislav Lhotka
- Re: [netmod] schema-mount pre09 branch Martin Bjorklund
- Re: [netmod] schema-mount pre09 branch Ladislav Lhotka