Re: [netmod] Fwd: New Version Notification for draft-lengyel-netmod-yang-instance-data-01.txt
Robert Wilton <rwilton@cisco.com> Tue, 26 June 2018 14:07 UTC
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To: Balazs Lengyel <balazs.lengyel@ericsson.com>, "netmod@ietf.org" <netmod@ietf.org>
References: <152889763632.15168.12247537431295038165.idtracker@ietfa.amsl.com> <75383a97-d08b-b202-70a6-eab064963af8@ericsson.com> <b58d21a9-d27e-c8b3-e8e3-483dd6942c9e@cisco.com> <f946ca96-1cb2-e032-9adc-7df00702e216@ericsson.com> <20180626121156.fq5ioq2gh5sy3v7n@anna.jacobs.jacobs-university.de> <e50fdff6-caa2-aada-011e-534b14ffdcf1@cisco.com> <20180626135232.cdlrbbideyackdfe@anna.jacobs.jacobs-university.de>
From: Robert Wilton <rwilton@cisco.com>
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Date: Tue, 26 Jun 2018 15:07:16 +0100
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Subject: Re: [netmod] Fwd: New Version Notification for draft-lengyel-netmod-yang-instance-data-01.txt
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On 26/06/2018 14:52, Juergen Schoenwaelder wrote: > On Tue, Jun 26, 2018 at 02:37:21PM +0100, Robert Wilton wrote: >> >> On 26/06/2018 13:11, Juergen Schoenwaelder wrote: >>> On Tue, Jun 26, 2018 at 01:58:44PM +0200, Balazs Lengyel wrote: >>>> Thanks for the comments and support. See answers below. >>>> Balazs >>>> >>>> On 6/13/2018 4:40 PM, Robert Wilton wrote: >>>> >>>> Hi, >>>> >>>> I would support this draft (if/when a call for adoption is made). >>>> >>>> A few comments from a quick review : >>>> >>>> 1) I think that it would be useful to allow a file to contain multiple >>>> "instance data sets". I could easily imagine that multiple different >>>> blocks of instance data may need to be provided and allowing these to be >>>> carried within a single file seems helpful. >>>> >>>> BALAZS: We allow multiple YANG modules in a file, but I have never seen it >>>> used. Actually my model/tool designers asked me to prohibit multiple YANG >>>> modules (YAMs) in one file at least within Ericsson. So if the group >>>> decides so it can be allowed, however I think it is not a good idea. >>> What exactly is "multiple YANG modules in a file"? I am confused and >>> you may be talking past each other. >> An example could be wanting to provide a single file that holds the >> capabilities for all different linecard types for a particular type of >> device, rather than providing them as a set of files. >> >> Of course, this could also be achieved using a meta YANG module (e.g. the >> top level module could have a list of linecard types, which each linecard >> type contains the capabilities for that linecard). Whether this make sense >> probably depends on the underlying YANG modules and how they are >> constructed. >> >> Of just using separate files, in which case the meta information can just be >> managed into the file name, and the file can be provided as a zip. >> > I am left puzzled. There is instance data (in a datastore) and you > serialize (perhaps filtered) the instance data into a file. Instance > data in general has data that conforms to multiple YANG modules, in > particular also due to augments. I think we need to solve the general > problem, not an isolated linecard problem. OK, so I wasn't assuming that instance data necessarily corresponds to instance data coming from a datastore (or an entire datastore). I was thinking that it can be any data that has a well defined YANG schema associated with it. E.g. perhaps it could use to represent the YANG data sent or received in a YANG encoded RPC. > >> Instance data MUST follow the XML and JSON encoding rules defined in >> RFC7950 and 7951. Data MUST be present in canonical form or where that is >> not defined in lexical representation. Whitespace must also be handled as >> defined by the encoding rules. > I thought the 2nd and 3rd sentence would be not needed but checking > RFC 7951 I see no mentioning that values must be in canonical format. > I guess this is an omission of RFC 7951 - perhaps I should open an > errata. RFC 7950 says this clearly in section 9.1: > > When a server sends XML-encoded data, it MUST use the canonical form > defined in this section. > > Looks like an omission in RFC 7951. > >>>> 7) It might want to include a semantic version number for an >>>> instance-data-set, depending on whether the YANG versioning discussions >>>> ends up. >>>> >>>> BALAZS: Yes I would like to. However I am not exactly clear on what does >>>> backwards compatibility mean for instance data. >>>> Data MAY NOT be removed or changed only added. ??? >>>> Who would use the semver numbers ??? >>> What does the version number mean? Every change of instance data in an >>> instacne-data-set leads to a new version number? What is a bug fix in >>> this sense? What is a non-backwards compatible change of instance data? >>> I am left a bit puzzled. >> Probably I don't mean semantic version. But often files have versioning, or >> revision, information associated with them. This can be muxed into the file >> name/path, but it also seems like potentially useful metadata, and being >> able to handle this generically in a consistent way might be beneficial. >> >> As an example, perhaps the capability information related to S/W release >> 1.2.4, etc. > We need to separate a version number of the instance data from the a > version number (or version context) that may be needed in order to > understand what a YANG (module, path) tuple means if we move to a > different YANG versioning scheme. The later I agree would be needed, > the former I am less sure of - at least if we talk semantic version > numbers. Yes, I agree with the need for the latter, that may entail listing the versions of the modules in the meta-data. But what I was actually referring to was the former, and thinking more of it is just being a string field in the meta-data with a well defined name, that is optional to populate. Actually, I see the current definition already has a revision with a date and description string. This is roughly along the lines of what I was thinking of for versioning (although I'm not sure why this should be a list rather than just a pair of leaves). Thanks, Rob > > /js >
- Re: [netmod] Fwd: New Version Notification for dr… Robert Wilton
- Re: [netmod] Fwd: New Version Notification for dr… Balazs Lengyel
- Re: [netmod] Fwd: New Version Notification for dr… Joe Clarke
- Re: [netmod] Fwd: New Version Notification for dr… Juergen Schoenwaelder
- Re: [netmod] Fwd: New Version Notification for dr… Martin Bjorklund
- Re: [netmod] Fwd: New Version Notification for dr… Robert Wilton
- Re: [netmod] Fwd: New Version Notification for dr… Robert Wilton
- Re: [netmod] Fwd: New Version Notification for dr… Ladislav Lhotka
- Re: [netmod] Fwd: New Version Notification for dr… Juergen Schoenwaelder
- Re: [netmod] Fwd: New Version Notification for dr… Robert Wilton
- Re: [netmod] Fwd: New Version Notification for dr… Juergen Schoenwaelder
- Re: [netmod] Fwd: New Version Notification for dr… Balazs Lengyel
- Re: [netmod] Fwd: New Version Notification for dr… Juergen Schoenwaelder
- Re: [netmod] Fwd: New Version Notification for dr… Balazs Lengyel
- Re: [netmod] Fwd: New Version Notification for dr… Balazs Lengyel
- Re: [netmod] Fwd: New Version Notification for dr… Robert Wilton
- Re: [netmod] Fwd: New Version Notification for dr… Ladislav Lhotka
- Re: [netmod] Fwd: New Version Notification for dr… Balazs Lengyel
- Re: [netmod] Fwd: New Version Notification for dr… Balazs Lengyel
- Re: [netmod] Fwd: New Version Notification for dr… Juergen Schoenwaelder
- Re: [netmod] Fwd: New Version Notification for dr… Balazs Lengyel
- Re: [netmod] Fwd: New Version Notification for dr… Robert Wilton
- Re: [netmod] Fwd: New Version Notification for dr… Balazs Lengyel
- Re: [netmod] Fwd: New Version Notification for dr… Balazs Lengyel
- Re: [netmod] Fwd: New Version Notification for dr… Balazs Lengyel
- Re: [netmod] Fwd: New Version Notification for dr… Balazs Lengyel
- Re: [netmod] Fwd: New Version Notification for dr… Robert Wilton
- Re: [netmod] Fwd: New Version Notification for dr… Juergen Schoenwaelder
- Re: [netmod] Fwd: New Version Notification for dr… Balazs Lengyel
- Re: [netmod] Fwd: New Version Notification for dr… Joe Clarke
- Re: [netmod] Fwd: New Version Notification for dr… Martin Bjorklund
- Re: [netmod] New Version Notification for draft-l… Einar Nilsen-Nygaard (einarnn)
- Re: [netmod] Fwd: New Version Notification for dr… Alexander Clemm
- Re: [netmod] Fwd: New Version Notification for dr… Ladislav Lhotka
- Re: [netmod] Fwd: New Version Notification for dr… Juergen Schoenwaelder
- Re: [netmod] Fwd: New Version Notification for dr… Robert Wilton
- [netmod] Fwd: New Version Notification for draft-… Balazs Lengyel
- [netmod] Fwd: New Version Notification for draft-… Balazs Lengyel
- Re: [netmod] Fwd: New Version Notification for dr… Balazs Lengyel
- Re: [netmod] Fwd: New Version Notification for dr… Juergen Schoenwaelder
- Re: [netmod] Fwd: New Version Notification for dr… Juergen Schoenwaelder
- Re: [netmod] New Version Notification for draft-l… Balazs Lengyel