microservices-patterns

To decompose a monolithic application into microservices, identify service boundaries using Bounded Contexts and incrementally extract functionality using the Strangler Fig pattern. This enables piece-by-piece migration without disrupting the entire system.

In saga patterns, orchestration uses a central coordinator to command distributed transaction steps, whereas choreography relies on events where each service reacts independently. Orchestration offers clear control flow, while choreography provides looser service decoupling.

Use event-driven architecture instead of synchronous REST or gRPC when you need asynchronous communication and decoupled services. REST and gRPC fit immediate request-response cycles, while event-driven design excels in processing complex, asynchronous workflows.

Common anti-patterns when building distributed systems include creating a distributed monolith where services are tightly coupled, and using shared databases across multiple services. These mistakes negate the scalability and independence benefits of a microservice architecture.

CQRS separates read and write operations into distinct models to optimize performance, while Event Sourcing stores state changes as a sequence of events. Together in a microservice architecture, they provide an immutable audit log and scalable data retrieval.