What is the Saga pattern, and when would you use it in microservices?
The Saga pattern is a design pattern for managing long-running distributed transactions in
microservices, especially in the context of eventual consistency. It breaks a large transaction
into a series of smaller, isolated transactions that are coordinated through a sequence of
events.
- Choreography: Each service involved in the saga listens for events and takes action
accordingly (decoupled).
- Orchestration: A central orchestrator (e.g., a Saga Orchestrator) directs the saga,
ensuring each step is performed and compensation is handled if something fails.
When to use it:
- Long-running workflows that span multiple microservices.
Follow :
- When you need to ensure that if a service fails, the changes made by previous
services are rolled back.
Example: In an Order Management System, if an order involves creating an order,
processing payment, and updating inventory, the Saga pattern ensures each step completes
successfully. If any step fails, compensation transactions (like refunding payment) are
triggered.