Durable function Timeout

Question

I'm Using Azure Durable Functions .Net Core.

[FunctionName("Calculate")]  
public async Task RunOrchestrator(  
    [OrchestrationTrigger] IDurableOrchestrationContext context, ILogger log)  
{  
    await context.CallActivityAsync<object>(FuncConstants.Cal1, null);  
    await context.CallActivityAsync<object>(FuncConstants.Cal2, null);  
    await context.CallActivityAsync<object>(FuncConstants.Cal3, null);  
    await context.CallActivityAsync<object>(FuncConstants.Cal4, null);  
    await context.CallActivityAsync<object>(FuncConstants.Cal5, null);     
    await context.CallActivityAsync<object>(FuncConstants.Cal6, null);  
    await context.CallActivityAsync<object>(FuncConstants.Cal7, null);  
    await context.CallActivityAsync<object>(FuncConstants.Cal8, null);  
    await context.CallActivityAsync<object>(FuncConstants.Cal9, null);  
}  

[FunctionName("Starter_Calculation")]  
public static async Task<HttpResponseMessage> HttpStart(  
    [HttpTrigger(AuthorizationLevel.Anonymous, "get", "post")] HttpRequestMessage req,  
    [DurableClient] IDurableOrchestrationClient starter,  
    ILogger log)  
{  
    string instanceId = await starter.StartNewAsync("Calculate", null);  
    return starter.CreateCheckStatusResponse(req, instanceId);  
}  

Here, each function takes more than 5-6 hours to perform some logical calculations (arithmetic operations) as they deal with more than 27-30 million database records.

I'm getting the error for the first function itself as "Timeout value of 00:30:00 was exceeded by function. In Azure, I'm using Premium App Service Plan, so I can set AlwaysOn.

I have a couple of questions:

1. Is Azure Function the best fit for such a scenario/long-running operations?
2. If yes, is there any way I can test it locally without a time-out error?

Please advice.

Answer 1

have you seen this link?

• https://learn.microsoft.com/en-us/azure/azure-functions/functions-host-json#functiontimeout

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Answer 2

Hi @Shreekumar Suggamad ,

Thanks for reaching out to Q&A.

I am answering your questions and providing some additional information

Is Azure Function the best fit for such a scenario/long-running operations?

Yes. Azure durable functions are best fit for long running operations as they are stateful functions. You are already using durable functions orchestrator and activity functions.
Please make sure you are aware of the orchestrator code constraints : https://learn.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-code-constraints?tabs=csharp

is there any way I can test it locally without a time-out error?

For an app running on Premium plan, the timeout value is unbounded so you can set to -1 initially and test it. Once you figure out the execution time, you can set the upper limit timeout value
https://learn.microsoft.com/en-us/azure/azure-functions/functions-host-json#functiontimeout

Hope this helps! Feel free to reach out to me if you have any questions or concerns.