This graph is from a paper on Amazon’s Dynamo. I suspect other months (not during shopping season) would look quite different.
With a name like “Elastic Compute Cloud”, I would expect the price for EC2 to reflect the supply of available compute capacity – isn’t this what elasticity of supply is all about? Currently pricing does not reflect time of use. I wonder how much performance degrades for EC2 users during Christmas shopping season.
Amazon relaxes the Consistency part of the DBMS ACID requirement in order to achieve availability. Maybe another rule could be relaxed, the one saying keys should not have any meaning beyond their use as an ID. If we did this, maybe Peano keys could be used, providing a spatially enabled Dynamo-like system.