Saga choreography is a pattern used in distributed systems for managing long-lived transactions that span multiple services or components. Unlike saga orchestration, which relies on a central coordinator to manage the sequence of actions, saga choreography involves decentralized coordination, with each service or component involved in the saga being responsible for coordinating its own actions.
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Decentralized Coordination: In saga choreography, there is no central coordinator. Instead, each service or component participating in the saga communicates directly with other services through events to coordinate the execution of the transaction.
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Event-Driven Communication: Saga choreography relies on asynchronous, event-driven communication between services. Services emit events to signal the completion of their actions or to request actions from other services.
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Local Decisions: Each service makes local decisions based on the events it receives, determining its next action or whether to initiate compensating actions in response to failures or exceptions.
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Simplicity: Saga choreography simplifies the architecture by removing the need for a central coordinator, resulting in a more decentralized and loosely coupled system.
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Scalability: Since there is no central point of coordination, saga choreography can scale more effectively as the number of services or components increases, allowing for greater parallelism and distribution of work.
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Resilience: Decentralized coordination reduces the risk of bottlenecks or single points of failure, enhancing the system's resilience against failures.
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Event-Driven Architecture: Saga choreography is typically implemented using an event-driven architecture, where services communicate through asynchronous events using message brokers or event streaming platforms.
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Service Autonomy: Each service participating in the saga is autonomous and responsible for handling its own state and interactions with other services.