Sagas
Sagas are a design pattern in distributed systems and microservices architectures for managing long-running transactions and ensuring data consistency across multiple services. They coordinate a series of local transactions, each updating data within a single service, and use compensating transactions to roll back changes if a failure occurs, avoiding the need for distributed locks. This pattern is particularly useful for complex business processes that span multiple bounded contexts.
Developers should learn and use Sagas when building microservices or distributed applications that require reliable, eventually consistent transactions across services, such as in e-commerce order processing, travel booking systems, or financial workflows. It helps handle failures gracefully by providing a structured way to undo partial updates, making systems more resilient and scalable compared to traditional two-phase commit protocols.