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See also: API Design Cheat Sheet, Platform Building Cheat Sheet

Microservices Cheat Sheet

  1. Do only one thing and do it well. The "one thing" is defined by a "Bounded Context" in Domain-Driven Design (DDD).
  2. Own your own data. No shared data stores.
  3. Embrace eventual consistency.
    • Don't read your writes.
    • Publish your own state-changes (minimally) to an event log.
  4. Leverage event logging and/or streaming to replicate and denormalize data from other services.
    • The event log must be subscribable to publish events to subscribers.
    • The event log must be durable and must not lose messages for publishing and replay.
    • Examples: Kafka, Confluent.io, Amazon Kinesis.
  5. When aggregating microservice calls, use asynchronous, non-blocking I/O. Perform as much as possible asynchronously.
  6. Support a registry/discovery mechanism.
  7. Support Location Transparency.
    • Support statelessness--no sticky sessions.
  8. Support the use of back-pressure (see, Reactive Streams specification) to avoid cascading failures.
  9. Support the Circuit Breaker pattern to manage faulty service dependencies.
  10. Consider CQRS to scale reads separately from writes.

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Cheat sheet for how to build microservices with scale, resilience and success.

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