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Lessons (12)

• 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 …

• Design an E-Commerce Checkout

  … key, then commit an order and publish an outbox event. Do not hold a database transaction open across …

• Real-Time, Pub/Sub, Webhooks and CDC

  … ownership CDC Publish committed database changes Use an outbox/transaction log, not app guesses Delivery is usually at …

• Kafka vs RabbitMQ & the Kafka Ecosystem

  … the easiest way to implement the outbox pattern or to stream database changes to search indexes and warehouses …

• Time, Consistency and Distributed Transactions

  … An outbox writes business state and its event in one local transaction. CRDTs converge without coordination for suitable …

• Kafka Producers

  … Use the outbox pattern when writing to a database and Kafka together (see Microservices → Sagas & Outbox ) Key takeaways …

• Event-Driven Architecture

  … versions/timestamps Lost events when saving + publishing Transactional outbox pattern Hard to debug "what happened?" Correlation IDs, distributed …

• Domain-Driven Design: Tactical Patterns

  … via an outbox } } Domain service Application service --- --- --- Contains business rules? ✅ Yes ❌ No, only orchestration Knows about transactions, repositories …

• CQRS & Event Sourcing

  … throws if already shipped await orderRepository.save(order); // + outbox event "ShippingAddressChanged" } // Projector: keeps the read model in sync …

• Database Indexing & Transactions

  … for that, see Sagas & the Outbox Pattern in the Microservices lessons. Key takeaways - Indexes turn O(n) scans …

• Normalization & Denormalization

  … The event/transactional outbox or refresh job that updates the copy. 3. Acceptable freshness delay. 4. Rebuild and …

• Choosing an Architecture

  … Hexagonal, Stripe behind an ACL"] b1((core)) -- b2[Stripe adapter] end end Mono -- events via outbox K[(Kafka …