Re: [yang-doctors] [Teas] Yangdoctors early review of draft-ietf-teas-yang-rsvp-10

Jan Lindblad <janl@tail-f.com> Tue, 14 May 2019 17:45 UTC

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From: Jan Lindblad <janl@tail-f.com>
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Date: Tue, 14 May 2019 19:45:20 +0200
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Cc: "draft-ietf-teas-yang-rsvp.all@ietf.org" <draft-ietf-teas-yang-rsvp.all@ietf.org>, "yang-doctors@ietf.org" <yang-doctors@ietf.org>, "teas@ietf.org" <teas@ietf.org>
To: "Reshad Rahman (rrahman)" <rrahman@cisco.com>, Tarek Saad <tsaad.net@gmail.com>
References: <155692863223.7173.7717533907709205656@ietfa.amsl.com> <EC71AEDD-6D31-440C-A6BB-1BBE3D931702@cisco.com> <BN8PR06MB6289AC30D85BC3D22693C65CFC080@BN8PR06MB6289.namprd06.prod.outlook.com> <9653FA2D-4C36-443F-B462-89D788B9E8FC@cisco.com> <6D7F1DEA-ECFF-4E3B-A2FE-EA1224DDBFEA@cisco.com>
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Subject: Re: [yang-doctors] [Teas] Yangdoctors early review of draft-ietf-teas-yang-rsvp-10
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Reshad, all,

Even with an XPath search (on servers that support XPath), a full linear search is required. The linear search would be performed by the server, but still takes the same amount of search work. If there can be a lot of sessions, it would be wise to consider using separate lists and natural keys.

Keyless lists are only good when the number of entries is guaranteed to be small (now and forever), as there is no other way to read such lists than reading the entire list at once. Usually not optimal for clients if there may be many entries.

/jan


> Hi Tarek,
>  
> I stand corrected. As you’ve pointed out this is a read-only list and Xpath filter can be used, no need for “meaningful” keys.
>  
> Regards,
> Reshad.
>  
> From: "Reshad Rahman (rrahman)" <rrahman@cisco.com>;
> Date: Tuesday, May 14, 2019 at 12:31 PM
> To: Tarek Saad <tsaad.net@gmail.com>;, "draft-ietf-teas-yang-rsvp.all@ietf.org"; <draft-ietf-teas-yang-rsvp.all@ietf.org>;
> Cc: "yang-doctors@ietf.org"; <yang-doctors@ietf.org>;, "teas@ietf.org"; <teas@ietf.org>;, Ebben Aries <exa@arrcus.com>;
> Subject: Re: [Teas] [yang-doctors] Yangdoctors early review of draft-ietf-teas-yang-rsvp-10
>  
> Hi Tarek,
>  
> If a user wants to have information for a specific 2205 session or a 3209 session, an artificial key or no key doesn’t help for that situation: the whole list has to be read until the session is found. Why not have separate lists (under a container) for the different session types, that way you can have meaningful keys for the 2205 and 3209 sessions.
>  
> Regards,
> Reshad.
>  
> From: Tarek Saad <tsaad.net@gmail.com>;
> Date: Tuesday, May 14, 2019 at 10:46 AM
> To: "Reshad Rahman (rrahman)" <rrahman@cisco.com>;, "draft-ietf-teas-yang-rsvp.all@ietf.org"; <draft-ietf-teas-yang-rsvp.all@ietf.org>;
> Cc: "yang-doctors@ietf.org"; <yang-doctors@ietf.org>;, "teas@ietf.org"; <teas@ietf.org>;, Ebben Aries <exa@arrcus.com>;
> Subject: Re: [Teas] [yang-doctors] Yangdoctors early review of draft-ietf-teas-yang-rsvp-10
>  
> Hi Reshad,
>  
> Base RSVP RFC2205 defines the session as. "An RSVP session is defined by the triple: (DestAddress, ProtocolId      [, DstPort])." RFC3209 defines a session object for RSVP-TE LSP(s) as tuple (tunnel endpoint, tunnel ID, extended tunnel ID). Since keys are mandatory leafs for lists, and to make it generic, we thought of a having an independent index key for the list.
> Thinking more of it now, since the list is state/read-only, the key is optional and omitting it may be better. We can consider this in the next update to the document, thanks for pointing it out.
>  
> Regards,
> Tarek
>  
>  
> On 5/13/19, 2:09 PM, "Teas on behalf of Reshad Rahman (rrahman)" <teas-bounces@ietf.org on behalf of rrahman@cisco.com>; wrote:
>  
>     Hi,
>     
>     Question to the authors (I haven't followed this draft so apologies if I'm trying to revive a dead horse): why is there an artificial index (leaf local-index) for the sessions list, why not uniquely identify the session with destination address etc? Is it because there are different types of sessions?
>     
>     Regards,
>     Reshad.
>     
>     
>     On 2019-05-03, 8:11 PM, "yang-doctors on behalf of Ebben Aries via Datatracker" <yang-doctors-bounces@ietf.org on behalf of noreply@ietf.org>; wrote:
>     
>         Reviewer: Ebben Aries
>         Review result: On the Right Track
>         
>         2 modules in this draft:
>         - ietf-rsvp@2019-02-18.yang
>         - ietf-rsvp-extended@2019-02-18.yang
>         
>         No YANG compiler errors or warnings (pyang 2.0, yanglint 1.1.16, confdc 6.6.1)
>         
>         Module ietf-rsvp@2019-02-18.yang:
>         - Remove WG Chairs from contact information per
>           https://tools.ietf.org/html/rfc8407#appendix-B
>         - Use of 'state' containers.  It is stated in Section 2.3 that 'Derived state
>           data is contained under a "state" container...'.  My only comments here are:
>           a) Should use caution when using 'state' containers in NMDA compliant
>           modules.  Rob put together a nice doc here that I won't reiterate:
>           https://github.com/netmod-wg/FAQ/wiki/NMDA-Modelling-FAQ
>           Using such nomenclature locks you into r/o nodes only.
>           b) In some cases, the hierarchy is a bit redundant (statistics/state).
>           Other NMDA compliant modules will not introduce another 'state' hierarchy
>           for instance (see ietf-interfaces)
>         - leaf 'packet-len' is abbreviated while most other leafs are not
>         - authentication-key is of type string.  Is this leaf mean to be clear-text?
>           There is nothing associated with this type that would imply special
>           treatment in handling.
>         - crypto-algorithm: Are all identities from ietf-key-chain supported?
>         - Pluralization on counters:  e.g. 'in-error' vs. 'in-errors'. Maintain
>           consistency with other modules (see ietf-interfaces)
>         - Normative references are missing for some of the modules imported.  These
>           must be added per https://tools.ietf.org/html/rfc8407#section-3.9
>         
>         Module ietf-rsvp-extended@2019-02-18.yang:
>         - Remove WG Chairs from contact information per
>           https://tools.ietf.org/html/rfc8407#appendix-B
>         - Use of 'state' containers.  It is stated in Section 2.3 that 'Derived state
>           data is contained under a "state" container...'.  My only comments here are:
>           a) Should use caution when using 'state' containers in NMDA compliant
>           modules.  Rob put together a nice doc here that I won't reiterate:
>           https://github.com/netmod-wg/FAQ/wiki/NMDA-Modelling-FAQ
>           Using such nomenclature locks you into r/o nodes only.
>           b) In some cases, the hierarchy is a bit redundant (statistics/state).
>           Other NMDA compliant modules will not introduce another 'state' hierarchy
>           for instance (see ietf-interfaces)
>         - Pluralization on counters:  e.g. 'in-error' vs. 'in-errors'. Maintain
>           consistency with other modules (see ietf-interfaces)
>         - 9 features are defined with no 'if-feature' statements.  Where are these
>           feature conditions meant to be used?
>         - Normative references are missing for some of the modules imported.  These
>           must be added per https://tools.ietf.org/html/rfc8407#section-3.9
>         
>         
>         General comments on the draft/modules:
>         - The state container and list key designs appear very familiar to that of
>           OpenConfig modules however not consistent with IETF module design.
>           Consistency is key from each producing entity (e.g. IETF in this case)
>         - The draft mentions RPCs and Notifications however none are defined within
>           the modules
>         - Section 2.3: Has examples of RPCs and Notifications that are non-existant in
>           the modules
>         - Abstract: s/RVSP/RSVP/
>         - Abstract: s/remote procedural/remote procedure/
>         - Section 2: s/extensiion/extension/
>         - Section 4: Update the security considerations section to adhere to
>           https://tools.ietf.org/html/rfc8407#section-3.7 and
>           https://trac.ietf.org/trac/ops/wiki/yang-security-guidelines
>         - Various (missing) wording/pluralization cleanup throughout that I'll defer
>           to the RFC Editor.  A once over proofread should solve this.
>         
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