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Choosing the Right Azure Function

In my previous blog post, I discussed Azure Functions and demonstrated how to create and trigger them using an HTTP request. However, what are Azure Durable Functions, and how do they differ from Azure Functions? Furthermore, when should we use them? In this blog post, I will address these questions.

Azure Function:

Azure Function is a serverless computing service that allows you to run code without managing infrastructure, servers, or operating systems.

Azure Durable Function

Azure Durable Function, on the other hand, is an extension of Azure Function that enables you to write stateful functions in a serverless environment. Stateful functions can maintain state across multiple executions and orchestrate complex workflows using durable tasks. Durable tasks are functions that can be scheduled, awaited, and retried by the orchestrator function.

When to Use Azure Function:

  • Event-Driven Scenarios: When responding to events quickly, such as HTTP requests, database triggers, file uploads, or queue messages.
  • Small Units of Code: For short-lived tasks or microservices where individual functions handle specific, independent tasks.
  • Cost-Efficient Scaling: Functions are a good choice when you have unpredictable workloads, as they scale automatically and you only pay for the resources used during execution.

When to Use Azure Durable Functions:

  • Long-Running Processes: When dealing with workflows that involve chaining multiple functions together or require state management over extended periods.
  • Stateful Orchestration: For complex processes that require coordination, time-outs, human interaction, or parallel execution of multiple functions in a coordinated workflow.
  • Monitoring and Debugging: Durable Functions offer built-in capabilities for managing the state and tracking the progress of long-running tasks, making it easier to monitor and debug these processes.


Choose Azure Functions for stateless, short-lived tasks triggered by events, where you need rapid response and cost-effective scaling. Opt for Azure Durable Functions when dealing with complex workflows, long-running processes, or orchestrating multiple functions in a stateful and coordinated manner.

If you have any questions or feedback, please leave a comment below.

Thank you for reading!

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