A comprehensive guide to preventing duplicate message processing across Kafka, Kafka Streams, RabbitMQ, SQS, and Redis — covering EOS internals, Kafka Streams State Store vs Redis architecture, idempotent consumers, and production deduplication patterns for senior engineers.
Deep dive into Kafka Streams Modern Processor API (PAPI 3.x+), Wall-Clock vs Stream-Time Punctuators, WindowStore event deduplication, Dead Letter Queue (DLQ) DeserializationExceptionHandler, the Async Network I/O anti-pattern, and Schema Registry Serdes.
Principal engineering guide to payment processing resilience — multi-tier deduplication, request fingerprinting, retriable error classification, the transactional outbox pattern, reverse inquiry polling, and 3-way reconciliation engines.
