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Lessons (10)

• Kafka vs RabbitMQ & the Kafka Ecosystem

  … integration without code Ready-made connectors move data between Kafka and other systems, configured with JSON instead of …

• What Is Apache Kafka?

  … append an event const producer = kafka.producer(); await producer.connect(); await producer.send({ topic: "orders", messages: [{ key: "customer …

• Kafka Producers

  … kafka-1:9092", "kafka-2:9092"] }); const producer = kafka.producer({ idempotent: true, maxInFlightRequests: 5 }); await producer.connect(); export …

• Delivery Guarantees: At-Most, At-Least & Exactly Once

  … const producer = kafka.producer({ transactionalId: "ledger-writer-1", idempotent: true, maxInFlightRequests: 1 }); await producer.connect(); await consumer.run …

• Message Queues & RabbitMQ

  … producer and consumer (Node.js, amqplib) js // producer.js import amqp from "amqplib"; const connection = await amqp.connect …

• Consumers & Consumer Groups

  … no harm. js const consumer = kafka.consumer({ groupId: "email-service" }); await consumer.connect(); await consumer.subscribe({ topic: "shop …

• Scaling & Health Probes

  … scale consumers on Kafka lag triggers: - type: kafka metadata: bootstrapServers: kafka:9092 consumerGroup: email-service topic: shop.orders …

• Hexagonal Architecture (Ports & Adapters)

  … its own language ForPlacingOrders , OrderRepository Adapter Code that connects a real technology to a port Express controller, Postgres …

• Deployments, ReplicaSets & Rollouts

  … APIs, web frontends Interchangeable pods, rolling updates StatefulSet Databases, Kafka, ZooKeeper, Elasticsearch Stable names ( db-0 , db-1 …

• Behavioral Patterns I: Observer, Strategy, Command, State

  … deliver delivered -- [ ] cancelled -- [ ] You've used it: useReducer in React, XState state machines, TCP connection states, order and …