Millions of tiny databases. Fascinating, detailed review of a paper that describes Amazon’s Physalia, a distributed configuration store designed to provide extremely high availability coordination for Elastic Block Store replication. My eyebrows raised at “Physalia is designed to offer consistency and high-availability, even under network partitions.” since that’s such a blatant violation of CAP theorem, but it later justifies it like so: “One desirable property therefore, is that in the event of a partition, a client’s Physalia database will be on the same side of the partition as the client. Clever placement of cells across nodes can maximise the chances of this.”
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