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Why Tarsnap won't use DynamoDB

As I've blogged about before, the Tarsnap server code synthesizes a log-structured filesystem on top of Amazon S3 . As a result of this design, for each block of data stored on Tarsnap, the server code needs to keep track of two key-value pairs: First, to map a 64-bit machine number and a 256-bit block ID to a 64-bit…