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Lessons (14)

• Brokers, Replication & Durability

  … In Kafka, every partition has one leader replica and several follower replicas on different brokers. ![Each partition has …

• Kafka Producers

  … It controls how many brokers must confirm a write before the producer considers it successful. mermaid sequenceDiagram participant …

• Event-Driven Architecture

  … Orders knows nobody"] O2[Orders] -- OrderPlaced B{{Event broker}} B -- I2[Inventory] B -- P2[Payments] B -- E2[Email …

• Topics, Partitions & Offsets

  … orders (3 partitions)"] P0["Partition 0 → Broker 1"] P1["Partition 1 → Broker 2"] P2["Partition 2 → Broker 3 …

• What Is Apache Kafka?

  … them Broker A Kafka server that stores partitions A printing plant Cluster A group of brokers working together …

• Kafka vs RabbitMQ & the Kafka Ecosystem

  When to choose Kafka and when a traditional broker like RabbitMQ fits better, plus a tour of Kafka …

• Message Queues & RabbitMQ

  … true }); // survives broker restart channel.sendToQueue( "emails", Buffer.from(JSON.stringify({ to: "ana@mail.com", template: "welcome" })), { persistent …

• Stacks & Queues

  … task scheduling, message brokers, the event loop, BFS.

• Service Communication: Sync vs Async

  … messaging and events A service publishes a message to a broker (Kafka, RabbitMQ, SQS) and moves on. Interested …

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

  … producer ID + sequence numbers let the broker drop retried duplicates. It's on by default in modern Kafka …

• Data in Microservices: Sagas & the Outbox Pattern

  … A separate relay process reads the outbox and publishes to the broker. mermaid flowchart LR subgraph Tx["One …

• Consumers & Consumer Groups

  … as Consumer 2 participant GC as Group coordinator (broker) Note over C1,C2: C1 has P0, P1 · C2 …

• Deploying & Operating Microservices

  … requests, finish current ones await db.end(); await broker.disconnect(); process.exit(0); }); setTimeout(() = process.exit(1), 25 …

• Domain-Driven Design: Tactical Patterns

  … other bounded contexts (through an outbox and a broker), and can even become the source of truth ( event …