hno@hem.passagen.se writes:
>Duane, is it possible to add a new ICP operation to invalidate objects,
>without breaking existing ICP implementations? And will even this be
>enought? What about large hierarchies?
Issues I have with ICP invalidation:
1) UDP is unreliable. Do you require ACKs of the invalidation?
2) Would you establish a peer relationship with someone who had
the power to invalidate your entire cache?
My cache access lists currently accept ICP from hundreds of
subnets around the world. How can I trust the invalidation is
legitimate?
3) How do you limit the scope? Does a single PUT at one
cache cause a flood of invalidation messages all over
the world?
Practially speaking, we could ad an opcode and it would be
ignored by caches running prior versions.
Duane W.
Received on Tue Jul 29 2003 - 13:15:40 MDT
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