Description

The SAGA pattern is a failure management pattern for distributed transactions. It manages data consistency across microservices in distributed transaction scenarios. A SAGA is a sequence of local transactions. Each local transaction updates the database and publishes an event or message to trigger the next local transaction in the SAGA. If a local transaction fails because it violates a business rule then the SAGA executes a series of compensating transactions that undo the changes that were made by the preceding local transactions.

Where to use

• Managing data consistency across microservices without distributed transactions.
\n
• Complex workflows like order processing.
\n
• Systems where eventual consistency is acceptable.

Real World Example

E-commerce Order Processing: Order Service -> Payment Service -> Shipping Service. If Shipping fails, the system executes compensating transactions to refund payment and cancel the order.

Code Example

# Code Concept for SAGA Pattern
# This pattern is architectural.

class Service:
    def execute(self):
        # Implementation logic
        pass