Subject: [CDNi] Notes from yesterday's Footprint/Capabilities Phone Call

From: Jan Seedorf <[email-masked]>
Date: Fri, 26 Oct 2012 09:14:10 +0000

Hi all,

Below are my notes from yesterday's call. The next steps are to continue the discussion about what capabilities we regard as mandatory (and which ones as optional), and also where we see the split between metadata and advertisement. Please comment on the list if you have opinions.

If someone from the Metadata guys could summarize what they think is in scope of metadata and where they see the split to advertisement, it would probably help our discussion.

 - Jan

CDNI Footprint/Capabilities Phone Call - 20121025
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-- Jan recaps last two phone calls: focus has been on capabilities and on agreeing on a use case to drive the discussion; agreement has been found on the use case proposed by Anne and Emile
-- Anne summarizes the changes in the use case she circulated on the mailing list
-- discussion that the interface will only signal the delta with respect to a given contract; question is whether to send the whole state each time or only what has changed; Francois: protocol should be able to signal a small delta, but also be able to signal the whole state (e.g. at the beginning)
-- discussion about quality parameters, agreement that highly dynamic parameters should not be conveyed with advertisement; Francois: having very coarse-grained quality information may be ok in advertisement; Jon: we should be careful not to over-design
-- Scott: problem with quality advertisement may be that things can change rapidly
-- Jon: protocol exchange will not result in changing amount of money being exchanged
-- Francois: not sure that the capabilities should be expressed as a URL-type-of-syntax (as in the example circulated by Anne); Anne: URL-type-syntax is important to have for the UCDN;
-- agreement that type of delivery protocol is important; agreement that type of supported authorization mechanism is important;
-- Francois: what about the concept of time-window? Is that a mandatory capability?
-- Jon: we need to split what is in metadata and what is in advertisement;
-- Jon: some things are specific to a CDN (probably capabilities: what a CDN can do), some things are specific to a piece of content (probably metadata)
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Jan Seedorf
Senior Researcher
NEC Europe Ltd., NEC Laboratories Europe, Network Division     
Kurfuerstenanlage 36, D-69115 Heidelberg
Tel.     +49 (0)6221 4342-221
Fax:     +49 (0)6221 4342-155
e-mail:  [email-masked]
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