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Lessons (14)

• Topics, Partitions & Offsets

  … A Kafka topic is the store; its partitions are the checkout lanes. ![A topic split into partitions; the …

• Consumers & Consumer Groups

  … 3. Different groups each get all the messages, independently, with their own offsets. mermaid flowchart LR subgraph Topic …

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

  … async ({ topic, partition, message }) = { const tx = await producer.transaction(); try { await tx.send({ topic: "ledger", messages: [{ key: message …

• What Is Apache Kafka?

  … key, value, timestamp, headers One newspaper story Topic A named stream of related events, e.g. orders A …

• Kafka vs RabbitMQ & the Kafka Ecosystem

  … direct, topic, fanout, headers exchanges Simple: topic + partition by key Ordering Per queue (with one consumer) Per partition …

• Brokers, Replication & Durability

  … Keep it false for important topics.) The controller and KRaft One broker acts as the controller : it tracks …

• Message Queues & RabbitMQ

  … Direct Exact routing key match "pdf" → pdf-queue Topic Wildcards: = one word, = zero or more order. .eu Fanout …

• Which Pattern Do I Need?

  … pattern System-level cousin --- --- Observer Pub/Sub, Kafka topics, event-driven architecture Facade API Gateway, Backend for Frontend …

• Clean Architecture

  … The [Software Architecture](/learn/software-architecture) topic covers [Clean Architecture in depth](/learn/software-architecture/clean-architecture), [Hexagonal …

• Kafka Producers

  … 5 }); await producer.connect(); export async function publishOrderPlaced(order) { await producer.send({ topic: "shop.orders.placed", acks: -1 …

• Scaling & Health Probes

  … email-service topic: shop.orders.placed lagThreshold: "1000" Vertical scaling (VPA) The VerticalPodAutoscaler recommends (or applies) better CPU …

• Finding Service Boundaries with DDD

  … architecture/ddd-tactical-design) in the Software Architecture topic. Key DDD vocabulary Term Meaning Example --- --- --- Domain The business …

• Event-Driven Architecture

  … APIs; document them (AsyncAPI) (The Kafka and Microservices topics cover delivery guarantees, the outbox, sagas and CQRS in …

• Clean Architecture in Depth

  … circle, not even its name. 💡 The Clean Code topic has a short introduction to this idea. This lesson …