Re: Distribution CPG Protocol

[John Martin <jmartin@netapp.com>]

Perhaps I'm jumping in a little late but...

Firstly with regards disk space, it is my experience that the last thing a 
surrogate runs out of is disk space. Period. In fact, with a busy cache, 
objects will expire before the replacement algorithm even comes into play. 
I'm not sure how streaming (multi-GB single objects) will impact this but 
I'm pretty sure that with multi-TB caches a reality today, and the ability 
to cache partial objects, it won't be a problem. I could be wrong.

But lets take a real example. I'm a very large content provider and I have 
one small gif file, my logo, which I would like to distribute as far as 
possible in order that my pages will be downloaded more quickly by my 
users. Do I care about the disk capacity of the various CDNs I contract 
with (or that they in turn contract with)?

More generally with QoS negotiation inter-CDN the only issue I see is that 
with a continuous media uri, there is no way to determine exactly which bit 
rates are supported (provided) since the origin-uri is always the same but 
it is absolutely necessary for the transit CDN to be able to support those 
that the CP is publishing. However, I'm pretty confident that on a 
peer-to-peer basis, I can negotiate that inter-CDN. So...

 > result, since we want to indicate things like "Bandwidth=128", I imagine
 > that each Generic Metric in the list would look like Metric1=valueA,
 > Metric2=valueB, etc. Should all values be only numeric? Hmm. Myself, I'm ok
 > with numeric.)

So, I'd agree with Phill w.r.t his analogy of community in BGP. I thing we 
just need to agree on a little more structure. One question, though: why 
restrict to numeric?

John
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