Orchestration

It is common that some business processes are implemented as multiple microservice calls. And the implementation must guarantee that all of the calls must eventually succeed even with the occurrence of prolonged downstream service failures. In some cases, instead of trying to complete the process by retrying for a long time, compensation rollback logic should be executed. Saga Pattern is one way to standardize on compensation APIs.

Cadence is a perfect fit for such scenarios. It guarantees that workflow code eventually completes, has built-in support for unlimited exponential activity retries and simplifies coding of the compensation logic. It also gives full visibility into the state of each workflow, in contrast to an orchestration based on queues where getting a current status of each individual request is practically impossible.

Samples

Runnable orchestration samples:

Sample	Description	Code
Trip booking Saga	Books a car, hotel, and flight, running compensations when a step fails	Java
Saga basics	Minimal example of registering compensations with the Saga class	Java
Sequential microservice calls	Chains activities, passing each result to the next step	Go
Human-approval orchestration	Expense report workflow that waits on an external approval service	Go

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Following are some real-world examples of Cadence-based service orchestration scenarios:

• Using Cadence workflows to spin up Kubernetes (Banzai Cloud Fork)
• Improving the User Experience with Uber’s Customer Obsession Ticket Routing Workflow and Orchestration Engine
• Enabling Faster Financial Partnership Integrations Using Cadence