[rrg] [GROW] Operational experience with cache based mapping ID

[Eliot Lear]

Dimitri,

I've written quite a bunch on this already, and you are free to borrow 
from any of the NERD versions you would like to snip from.

HOWEVER...

The title of the draft explicitly states "operational experience with 
cache based mapping".  Can you please help me with that?  I would think 
that as far as such mappings are concerned there are really only two 
groups of people who have any: LISPers and HIPsters.

If we are just going to talk about previous uses of caching, that's okay 
too, but I would suggest that the impact of a cache miss is HIGHLY 
variable based on application, and the actual occurrence of a cache miss 
is highly variable not only based on application, but based on 
configuration as well.

As a case in point, I used netnews to distribute the precursor of the 
Human Genome Project (GenBank) throughout the net to scientists' systems 
who would then suck the thing into an RDB.  Consistent distribution was 
important, and so a cache miss would stall an update.  But once the file 
had been loaded, any further misses were irrelevant.  There are a lot of 
netnews design examples out there from the server side.

It's been said that we've done caching before on routers, and this is 
true.  And so my point is simply this: the question must be asked, what 
are the similarities and differences between the systems in use and what 
was done previously?

Eliot