5 Transactions and queries in microservices

This chapter covers

  • The challenges of consistency in a distributed application
  • Synchronous and asynchronous communication
  • Using sagas to develop business logic across multiple services
  • API composition and CQRS for microservice queries

Many monolithic applications rely on transactions to guarantee consistency and isolation when changing application state. Obtaining these properties is straightforward: an application typically interacts with a single database, with strong consistency guarantees, using frameworks that provide support for starting, committing, or rolling back transactional operations. Each logical transaction might involve several distinct entities; for example, placing an order ...

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