[alto] Benjamin Kaduk's No Objection on draft-ietf-alto-cost-calendar-09: (with COMMENT)
Benjamin Kaduk <kaduk@mit.edu> Thu, 06 December 2018 09:21 UTC
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From: Benjamin Kaduk <kaduk@mit.edu>
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Date: Thu, 06 Dec 2018 01:21:42 -0800
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Subject: [alto] Benjamin Kaduk's No Objection on draft-ietf-alto-cost-calendar-09: (with COMMENT)
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Benjamin Kaduk has entered the following ballot position for draft-ietf-alto-cost-calendar-09: No Objection When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-alto-cost-calendar/ ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- Section 3.1 The capabilities of a Calendar-aware information resource entry have a member named "calendar-attributes" which is an array of objects of type CalendarAttributes. It is necessary to use an array because of resources such as Filtered Cost Map and Endpoint Cost Map, for which the member "cost-type-names" is an array of 1 or more values. I don't really follow this argument. Why does the value for "cost-type-names" affect the structure of the containing "calendar-attributes"? An ALTO Client should assume that the time interval size specified in the IRD is the smallest possible one that the ALTO Server can provide. The Client can aggregate cost values on its own if it needs a larger granularity. Where is the normative requirement on the server to behave in this fashion? It's weird to use string packing for units instead of a separate structured element in the language/structure. Section 4.1.1 This field is an array of 1 to N boolean values, where N is the number of requested metrics. Each boolean value indicates whether or not the ALTO Server should provide the values for this Cost Type as a calendar. The array MUST contain exactly N boolean values, otherwise the server returns an error. Is it a MUST requirement for the server to check? Section 4.2.2 If the ALTO client provides member "calendared" in the input parameters with a value equal to 'true' for given requested Cost Types, the "meta" member of a Calendared Endpoint Cost response MUST include, for these Cost Types, the same additional member "calendar- response-attributes", as specified for the Filtered Cost Map Service. On first reading I thought this was a requirement for data/value consistency between endpoint icost and filtered cost map service responses, but rereading it looks like it's just data structure reuse. So maybe something like "the contents of which obey the same rules as for the Filtered Cost Map Service (Section 4.1.2)". Section 6 Thanks for these well-thought-out security considerations; it's a pleasure to see. With respect to the last paragraph's mention of how the provided future guidance can be wrong, is this going to be a scenario where it would be helpful for the client to be able to just ping the server to ask "you gave me this data yesterday and I just want to double-check that it's still fresh/correct"? I don't see an obvious way in which this would be helpful (unless the size of the JSON responses are getting to be prohibitively large or something, I suppose), but I'm writing this on a plane so the risk of me missing something is higher even than its usual rate.
- [alto] Benjamin Kaduk's No Objection on draft-iet… Benjamin Kaduk
- Re: [alto] Benjamin Kaduk's No Objection on draft… Randriamasy, Sabine (Nokia - FR/Paris-Saclay)
- Re: [alto] Benjamin Kaduk's No Objection on draft… Benjamin Kaduk
- Re: [alto] Benjamin Kaduk's No Objection on draft… Randriamasy, Sabine (Nokia - FR/Paris-Saclay)