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Lessons (13)

• CQRS & Event Sourcing

  … fast, denormalised, eventually consistent. - Event sourcing: store every change as an immutable event; current state = replaying events. - You …

• Event-Driven Architecture

  … Event sourcing Events are the source of truth The account's state is the sum of Deposited / Withdrawn …

• Kafka vs RabbitMQ & the Kafka Ecosystem

  … to the same events, activity tracking, log aggregation, data pipelines into warehouses, CDC, event sourcing, real-time analytics …

• Big Data: ETL, Warehouses and Streaming

  … speed layer; Kappa treats an ordered event stream as the main source and reprocesses it when logic changes …

• Normalization & Denormalization

  … The normalized source of truth. 2. The event/transactional outbox or refresh job that updates the copy. 3 …

• What Is Apache Kafka?

  … CDC database changes → data warehouse Event sourcing the log IS the source of truth Who uses it: LinkedIn …

• Domain-Driven Design: Tactical Patterns

  … broker), and can even become the source of truth ( event sourcing , see the Microservices lessons). Factories When creating …

• Which Pattern Do I Need?

  … of Responsibility Middleware pipelines, API gateway filters Memento Event sourcing snapshots Key takeaways - Start from the problem you …

• Behavioral Patterns II: Chain, Template, Iterator, Mediator, Memento, Visitor

  … fixed order of steps async run(source) { const raw = await this.read(source); const records = this.parse(raw …

• Serverless Architecture

  … independent scaling and permissions Idempotent handlers Event sources retry; the same event may arrive twice Push work to …

• Topics, Partitions & Offsets

  … size 10 GB retention.ms=-1 Keep forever Event sourcing, audit logs Under the hood, each partition is …

• React Fundamentals

  … React state is the single source of truth for the input's value. For big forms, libraries like …

• Domain-Driven Design: Strategic Design

  … Domains and subdomains, ubiquitous language, bounded contexts, all the context-mapping patterns, and event storming to discover them …