Object-Oriented Programming · OpenAI · Medium
Lease-Based Queue with a Deadline Heap The core idea behind at-least-once delivery is simple: handing a job to a worker never removes it from the system. A reservation is only a lease, a temporary claim with an expiry time. A job leaves the queue for good in exactly two ways: the worker explicitly acknowledges it with pass, or its retry budget runs out and it moves to the dead-letter queue. If a worker crashes, hangs, or loses its network connection, nobody calls pass. The…