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Message Queues & Job Queues

Asynchronous messaging end to end: why queues exist, delivery guarantees, BullMQ v5 (Queue, Worker, Job, flows, NestJS integration), RabbitMQ, Kafka, dead letter queues, idempotency, and scaling strategies.

Message Queues & Job Queues

Why use a message queue?

Queue vs Pub/Sub

BullMQ core concepts

BullMQ job lifecycle

Redis as BullMQ's backend

Common job options

Dead letter queues

Idempotency in job processing

Retry backoff strategies

Concurrency & rate limiting in BullMQ

Repeatable (cron) jobs

At-least-once vs at-most-once vs exactly-once

BullMQ in NestJS

Job chaining & BullMQ Flows

RabbitMQ fundamentals

Kafka fundamentals

Scaling BullMQ workers

Monitoring with Bull Board

Redis Streams vs BullMQ

Exactly-once semantics in Kafka

Transactional outbox pattern