Building Resilient Event-Driven Backend Pipelines with Go and NATS JetStream
The Problem: Direct, synchronous HTTP/gRPC microservice calls create tight coupling and cascading failures when downstream services lag or fail. The Solution: Event-Driven Architecture (EDA) using NATS JetStream decouples API handlers from heavy background jobs using persistent, low-latency messaging streams. Core Setup: Streams: Persist events to disk (ORDERS.*) with defined retention policies. Producers: Publish JSON payloads synchronously to guarantee NATS receives the write. Durable Pull Consumers: Fetch batches of messages, execute processing, and explicitly send ACK upon success or NAK to request a retry. Production Best Practices: Transactional Outbox: Prevents database state and message publishing from drifting out of sync. Idempotency: Protects against duplicate event execution using unique order IDs in a cache like Redis. Dead Letter Queues (DLQ): Prevents permanently failing or malformed messages from blocking consumer workers.
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