DVA-C02 - Development with AWS Services - Section 1.2

Write fault-tolerant application code using idempotency, retries with exponential backoff and jitter, and dead-letter queues.

Design idempotent operations so that repeated retries produce the same result, and implement exponential backoff and jitter to avoid thundering-herd failures. Recognise when to route unprocessable messages to dead-letter queues rather than blocking the main consumer.

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