Re: [netmod] YANG library structure
Lou Berger <lberger@labn.net> Fri, 08 December 2017 11:10 UTC
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From: Lou Berger <lberger@labn.net>
To: Martin Bjorklund <mbj@tail-f.com>, netmod@ietf.org
Date: Fri, 08 Dec 2017 06:10:49 -0500
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Subject: Re: [netmod] YANG library structure
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Martin, Thanks for raising this, there's definitely some open issues as well as confusion on this topic. In the different options listed below you say that each datastore refers to a schema, correct? What is the mechanism you would use to do this? In talking to some others on this topic, they suggested using a library per datastore. I haven't look into this enough to know if that is a good or bad idea, but it seems functionally equivalent to your first option but realized in a different way. Just something to add to the mix. Lou On December 8, 2017 4:48:15 AM Martin Bjorklund <mbj@tail-f.com> wrote: > Hi, > > There has been quite a lot of discussion about the YANG library > data model on the list. The authors of draft-ietf-netconf-rfc7895bis > have tried to understand all arguments in the discussion, and provide > a solution. Below are 3 solution proposals (we have discussed more, > but they are basically just variations on the same themes). > > Absolute Requirements > --------------------- > > o RFC 7950, Section 5.6.5 says: > > A server MUST NOT implement more than one revision of a module. > > o draft-ietf-netmod-revised-datastores says: > > The conventional configuration datastores [...] share exactly > the same datastore schema > > o draft-ietf-netmod-revised-datastores says: > > The datastore schema for <operational> MUST be a superset of the > combined datastore schema used in all configuration datastores > except that YANG nodes supported in a configuration datastore MAY > be omitted from <operational> if a server is not able to > accurately report them. > > > These requirements (of course) still hold, and we think that the YANG > library document should explain what they imply for the data reported > as part of the library. (For example, all conventional datastores > MUST have a reference to the same "schema"). > > > Objectives (in no particular order) > ----------------------------------- > > 1. As efficient as possible for a client to consume. > > Since the size of the yang library can be quite large, it should > be possible for clients to cache the yang library information. > > 2. A dynamic datastore must be able to implement a module or feature > that is not implemented in the conventional datastores. > > 3. It must be possible to NOT implement a module or feature in > operational, even if it is implemented in some other datastore. > > This is required for transition purposes; a server that wants to > implement <operational> should not have to implement all modules at > once. > > 4. A given module can only be implemented in one revision in all > datastores. If a module is implemented in more than one > datastores, the same revision is implemented in all these > datastores. > > 5. Multiple revisions can be used for import, if import-by revision > is used. > > 6. Nice to have: make it possible to be used by schema mount > > > It should be noted that because of 2 and 3 (and 6), the original data > model in RFC 7895 cannot be used. > > > Use Cases > --------- > > Here's a set of use cases that must be supported. > > C1. conventional + operational, all have the same schema > > C2. conventional + operational, ietf-hardware is not implemented in > conventional > > C3. conventional + operational, some modules not yet implemented in > operational, and some modules are partly implemented in > operational. > > C4. conventional + operational + ephemeral, ephemeral has its own > set of modules > > > > Alt. A. > ------- > > Each datastore refers to a schema, and each schema contains a flat > list of all modules, features, etc. > > +--ro yang-library > +--ro schema* [name] > | +--ro name string > | +--ro checksum string > | +--ro module* [name] > | | +--ro name yang:yang-identifier > | | +--ro revision? revision-identifier > | | +--ro namespace inet:uri > | | +--ro location* inet:uri > | | +--ro submodule* [name] > | | | +--ro name yang:yang-identifier > | | | +--ro revision? revision-identifier > | | | +--ro location* inet:uri > | | +--ro feature* [name] > | | | +--ro name yang:yang-identifier > | | +--ro deviation* [module] > | | +--ro module -> ../../name > | +--ro import-only-module* [name revision] > | +--ro name yang:yang-identifier > | +--ro revision union > | +--ro namespace inet:uri > | +--ro location* inet:uri > | +--ro submodule* [name] > | +--ro name yang:yang-identifier > | +--ro revision? revision-identifier > | +--ro location* inet:uri > +--ro datastore* [name] > | +--ro name identityref > | +--ro schema -> ../../schema/name > +--ro checksum string > > > How does this solution handle the use cases above? > > C1: One schema, all datastores refer to this schema. > > C2: Two schemas, "conventional" and "operational". They differ in > just one element (ietf-hardware). All other module information > is entirely duplicated in both. > > C3: Two schemas, "conventional" and "operational". They differ in > the modules not implemented in operational, and operational also > has some deviation modules with "not-implemented". > > C4: Three schemas, "conventional", "ephemeral", "operational". > "operational" contains the union of all modules in the other > two. > > > Pro: simple on the client, simple on the server > > Con: verbose, since a single difference requires a complete, new, > schema. > > > Alt. B. > ------- > > Each datastore refers to a schema, and each schema contains a list > of references to module-sets, and each module-set contains a flat > list of all modules, features, etc. > > When combining module-sets into a schema there MUST NOT be any > duplicate module definitions in the module-sets. > > > +--ro yang-library > +--ro module-set* [name] > | +--ro name string > | +--ro checksum string > | +--ro module* [name] > | | +--ro name yang:yang-identifier > | | +--ro revision? revision-identifier > | | +--ro namespace inet:uri > | | +--ro location* inet:uri > | | +--ro submodule* [name] > | | | +--ro name yang:yang-identifier > | | | +--ro revision? revision-identifier > | | | +--ro location* inet:uri > | | +--ro feature* [name] > | | | +--ro name yang:yang-identifier > | | +--ro deviation* [module] > | | +--ro module -> ../../name > | +--ro import-only-module* [name revision] > | +--ro name yang:yang-identifier > | +--ro revision union > | +--ro namespace inet:uri > | +--ro location* inet:uri > | +--ro submodule* [name] > | +--ro name yang:yang-identifier > | +--ro revision? revision-identifier > | +--ro location* inet:uri > +--ro schema* [name] > | +--ro name string > | +--ro checksum string > | +--ro module-set* -> ../../module-set/name > +--ro datastore* [name] > | +--ro name identityref > | +--ro schema -> ../../schema/name > +--ro checksum string > > How does this solution handle the use cases above? > > C1: One module-set, one schema, all datastores refer to this schema, > the schema refers to the single module-set. > > C2: Two schemas, "conventional" and "operational", and two > module-sets. One module-set contains just "ietf-hardware" and > the other everything else. The "operational" schema refers to > both module-sets, and the "conventional" to just the one without > "ietf-hardware". > > C3: Two schemas, "conventional" and "operational", and three > module-sets. One module-set contains all modules fully > implemented in both conventional and operational, one contains > the modules implemented only in conventional, and one the > modules and deviations for the partly implemented modules in > operational. > > C4: Three schemas, "conventional", "ephemeral", "operational", but > just two module-sets. "conventional" refers to one of the > module-sets, and "ephemeral" to the other. "operational" refers > to both. > > Pro: less verbose > > Con: the client has to follow extra references and must combine the > result from the references into a single schema. > > > Alt. C. > ------- > > (This is the draft -02 version with just some name changes) > > Each datastore refers to a schema, and each schema contains a list > of references to each module it includes. > > +--ro yang-library > +--ro module* [id] > | +--ro id string > | +--ro name yang:yang-identifier > | +--ro revision? revision-identifier > | +--ro location* inet:uri > | +--ro namespace inet:uri > | +--ro feature* yang:yang-identifier > | +--ro deviation* [module] > | | +--ro module -> ../../id > | +--ro conformance-type enumeration > | +--ro submodule* [name] > | +--ro name yang:yang-identifier > | +--ro revision? revision-identifier > | +--ro location* inet:uri > +--ro schema* [name] > | +--ro name string > | +--ro module* -> ../../module/id > +--ro datastore* [name] > | +--ro name identityref > | +--ro schema -> ../../schema/name > +--ro checksum string > > How does this solution handle the use cases above? > > C1: One schema, all datastores refer to this schema, > the schema refers to all modules. > > C2: Two schemas, "conventional" and "operational", and the module > list contains all modules. The "operational" schema refers to > all modules, and "conventional" to all modules except > "ietf-hardware". > > C3: similar to C2, except there will be two entries in the module > list for evenry module that is partly implemented in > operational. > > C4: Three schemas, "conventional", "ephemeral", "operational", and > the module list contains all modules. > Each schema refers to the modules it supports. > > Pro: All modules available are listed in one place. > > Con: the client has to follow extra references and must combine the > result from the references into a single schema. > > the least "direct" solution due to the module "id". > > probably a bit tricky to implement on the server. > > > > /martin > > _______________________________________________ > netmod mailing list > netmod@ietf.org > https://www.ietf.org/mailman/listinfo/netmod >
- [netmod] YANG library structure Martin Bjorklund
- Re: [netmod] YANG library structure Lou Berger
- Re: [netmod] YANG library structure Juergen Schoenwaelder
- Re: [netmod] YANG library structure Lou Berger
- Re: [netmod] YANG library structure Ladislav Lhotka
- Re: [netmod] YANG library structure Juergen Schoenwaelder
- Re: [netmod] YANG library structure Martin Bjorklund
- Re: [netmod] YANG library structure Vladimir Vassilev
- Re: [netmod] YANG library structure Kent Watsen
- Re: [netmod] YANG library structure Andy Bierman