What is the role of the Saga pattern in microservices transactions?

Short answer: The Saga pattern is used to manage long-running transactions in microservices without requiring a distributed transaction (e.g., two-phase commit).

Explain a bit more

It breaks down a transaction into smaller, isolated steps, with each step running in its own service and completing successfully or being compensated in case of failure. Steps: Each microservice in a saga performs a local transaction and then publishes an event or sends a message to the next service. Compensation: If any step in the saga fails, compensating actions (like rolling back previous steps) are executed to maintain consistency. There are two types of sagas:

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.