Subject: Re: [CDNi] Definitions for "Recursive/Iterative CDNI request routing"

From: Ben Niven-Jenkins <[email-masked]>
Date: Thu, 4 Aug 2011 14:06:35 +0100

I don't hold a strong opinion but the framework seems a slightly better place IMO if for no other reason than because the Problem Statement doesn't currently use either of these terms.

Ben

On 27 Jul 2011, at 14:53, Bitar, Nabil N wrote:

> Hi,
> I think that the framework or problem statement document is more appropriate than the requirements document. The framework document now refers to terminology and definitions in the problem statement document, so it could be there. However, I think sit is better fit in he framework document.
> 
> Thanks,
> Nabil
> 
> From: Francois Le Faucheur <[email-masked]>
> Date: Tue, 26 Jul 2011 15:36:20 -0400
> To: Niven-Jenkins Ben <[email-masked]>, "Bitar, Nabil N" <[email-masked]>, Bruce Davie <[email-masked]>, Larry Peterson <[email-masked]>
> Cc: "[email-masked]" <[email-masked]>, Le Faucheur Francois <[email-masked]>
> Subject: Re: Definitions for "Recursive/Iterative CDNI request routing"
> 
> Hi,
> Any thoughts on that before the WG meeting?
> Francois
> 
> On 8 Jul 2011, at 14:01, Francois Le Faucheur wrote:
> 
>> Folks,
>> 
>> The definitions for the terms of "Recursive/Iterative CDNI request routing" had been included in the cdni-requirements document until they move to a more suitable place.
>> Could you guys agree on which document these definitions should migrate into (problem-statement or framework) and keep a mental note to include it there in the next rev?
>> 
>> Thanks
>> 
>> Francois
>> 
>> PS: Here is the relevant excerpt from cdni-framework:
>> 
>> "
>>  This also defined the following additional terms [Editor's Note:
>>   these definitions may be better located in another document such as
>>   the Problem Statement]:
>> 
>>   o  Recursive CDNI request routing: When an Upstream CDN elects to
>>      redirect a request towards a Downstream CDN, the Upstream CDN can
>>      query the Downstream CDN Request Routing system via the CDNI
>>      Request Routing protocol (or use information cached from earlier
>>      similar queries) to find out how the Downstream CDN wants the
>>      request to be redirected, which allows the Upstream CDN to factor
>>      in the Downstream CDN response when redirecting the user agent.
>>      This approach is referred to as "recursive" CDNI request routing.
>>      Note that the Downstream CDN may elect to have the request
>>      redirected directly to a Surrogate inside the Downstream CDN, to
>>      the Request-Routing System of the Downstream CDN, to another CDN,
>>      or to any other system that the Downstream CDN sees as fit for
>>      handling the redirected request.
>> 
>>   o  Iterative CDNI Request Routing: When an Upstream CDN elects to
>>      redirect a request towards a Downstream CDN, the Upstream CDN can
>>      base its redirection purely on a local decision (and without
>>      attempting to take into account how the Downstream CDN may in turn
>>      redirect the user agent).  In that case, the Upstream CDN
>>      redirects the request to the request routing system in the
>>      Downstream CDN, which in turn will decide how to redirect that
>>      request: this approach is referred to as "iterative" CDNI request
>>      routing.
>> "
>> 
>> Francois
> 
> 
> Francois Le Faucheur
> Distinguished Engineer
> Corporate Development
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