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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