Retry and Circuit Breaker) on operations with Event Hubs and Cosmos DB, as well as timeout handling on the production of commands and events. The proposed solution applies a set of design patterns (e.g. operation retries on databases and message streaming platforms, timeout handling). Resiliency: A solution capable of handling a set of potential transient failures (e.g. The proposed solution leverages the Azure Functions programming model, reducing the overhead on state management, checkpointing (mechanism that updates the offset of a messaging partition when a consumer service processes a message) and restarts in case of failures. The implementation reference addresses the following challenges and concerns from Contoso Bank:ĭeveloper experience: A solution that allows developers focus only on the business logic of the Saga participants and simplify the implementation of stateful workflows on the Saga orchestrator. The solution leverages Azure Functions for the implementation of Saga participants, Azure Durable Functions for the implementation of the Saga orchestrator, Azure Event Hubs as the data streaming platform and Azure Cosmos DB as the database service. It is a Saga pattern implementation reference through an orchestration approach in a serverless architecture on Azure. The solution simulates a money transfer scenario, where an amount is transferred between bank accounts through credit/debit operations and an operation receipt is generated for the requester. Instead of ACID transactions, a Saga addresses the challenge by coordinating a workflow through a message-driven sequence of local transactions to ensure data consistency. The traditional ACID approach is not suited anymore for Contoso Bank as the data of operations are now spanned into isolated databases. Operations are now distributed across applications and databases, and Contoso needs a new architecture and implementation design to ensure data consistency on financial transactions. While the Prince was initially resistant to helping them, Ghüs convinced him to help them in their search for their daughter.Orchestration-based Saga implementation reference in a Serverless architecture on AzureĬontoso Bank is building a new payment platform leveraging the development of microservices to rapidly offer new features in the market, where legacy and new applications coexist. Ghüs spotted their ship returning years later and instantly ran to tell Prince Robot IV, now stripped of title and called Sir Robot, that Marko and Alana were coming. Over the next few years, Ghüs lived quietly on Quietus while Alana and Marko had left to find their daughter. Upon arriving, they were too late and the Last Revolution had already escaped with Hazel. He decided to sacrifice himself to plug the leak but was knocked out by Yuma who plugged the leak to save everyone’s life. When they had a fuel leak, Ghüs rushed to investigate the issue. The group was soon attacked by a warship from the Robot Kingdom. Since Friendo was onboard the Wooden Treehouse they used him to track Alana and his son. When Marko became separated from his wife and Prince Robot IV became separated from his son, they teamed up and asked Ghüs for help. His plan was to use it to help protect himself from the bone bugs. He sold one of his stock, Friendo, to Klara in exchange for her ax. Ghüs is a bipedal seal-man who herds cattle resembling walruses on the planet Quietus.
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