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Details in Saga pattern - Azure Design Patterns | Microsoft Learn |
Problem
Data consistency is a major issue in distributed transaction scenarios.
Cross-service data consistency requires a cross-service transaction management strategy : transactions must be atomic, consistent, isolated and durable (ACID).
If a transaction (step) fails, the pattern will execute compensating transactions that counteract the preceding transactions.
Solution
Orchestration is a way to coordinate sagas where a centralized controller tells the saga participants waht local transactions to execute.
Orchestrator executes saga requests, stores and interprets the states of each task, and handles failure recovery with compensating transactions.
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Saga In Practice
Example of orchestration with Azure Function Apps and 2 different triggers : Call API from Web App (client application) or a change in a blob Storage.
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