On Idempotency Keys

&#xA; Table of Contents &#xA; &#xA; UUIDs &#xA; Monotonically Increasing Sequences &#xA; Deriving Idempotency Keys From the Transaction Log &#xA; Discussion &#xA; &#xA; &#xA; &#xA; In distributed systems, there’s a common understanding that it is not possible to guarantee exactly-once delivery of messages.&#xA; What is possible though is exactly-once processing . By adding a unique idempotency key…