Idempotency and Fencing
Papers Time, Clocks, and the Ordering of Events in a Distributed System and The Chubby lock service for loosely-coupled distributed systems
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Idempotency and Fencing. 06 - IDEMPOTENCY + FENCING
at-least-once + a slow worker = a job runs twice
REAL LIFE - a bank:
It won't cash the same CHEQUE NUMBER twice (idempotency key). And it stamps each a
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