Azure Functions ( Http Triggered) started throwing Task Canceled Exception randomly

Question

Azure Functions ( Http Triggered) started throwing Task Canceled Exception randomly

AG 21

How do I go about troubleshooting this?

I have a couple of Azure functions that use the following trigger signature [HttpTrigger(AuthorizationLevel.Anonymous, "get", "post").
The functions are running on a consumption plan.
They get triggered 2-3 times a day.

The function intermittently fails to trigger with the following exception:

Full Call stack:

Microsoft.Azure.WebJobs.Host.FunctionInvocationException:
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor+

VasimTamboli 5,215 Reputation points

2023-06-04T13:46:11.5+00:00

few troubleshooting steps you can follow to investigate and resolve the issue:

Check the execution time: Azure Functions running on a consumption plan have a maximum execution time limit of 5 minutes. If your function takes longer than this limit, it will be canceled. Make sure your function execution completes within this time frame. If it requires more time, consider moving to a different hosting plan.

Review the logs: Enable Application Insights for your Azure Function to get detailed logging and monitoring. Check the logs for any exceptions or errors that might give you insights into the cause of the cancellation. Look for any patterns or commonalities among the failed executions.

Increase timeout settings: If your function requires more time to execute, you can try increasing the function timeout by modifying the functionTimeout property in your host.json file. Set a higher value to accommodate the function's execution time.

Check for dependencies or external services: If your function relies on external dependencies or services, ensure they are accessible and functioning correctly. If there are any intermittent network issues or service disruptions, it can lead to cancellation of the function execution.

Optimize your function code: Review your function code for any long-running or blocking operations. Make sure you're using asynchronous patterns and leveraging async/await to avoid blocking the execution thread. Optimize any database or network operations to minimize execution time.

Scale-out options: Consider scaling out your Azure Functions by increasing the number of instances. This can help distribute the load and reduce the chances of cancellation due to resource limitations.

Check for resource limitations: Verify that your Azure subscription and resource group have sufficient resources available. If you're reaching resource limits, it can impact the execution of your functions.

Update Azure Functions runtime: Ensure you're using the latest version of the Azure Functions runtime. Updates often include bug fixes and performance improvements that can help address known issues.
AG 21 Reputation points

2023-06-06T05:18:53.21+00:00

I added more data to the question, but all that has been stripped off. According to Diagnostic, the functions are throwing the following exception: FunctionInvocationCanceledException. The invocation request with id <GUID> was canceled before the request was sent to the worker. This means the code inside my function has not even been touched yet.

You can see more details about the exception here at StackOverflow : https://stackoverflow.com/q/76385900/994244

Your answer

AG 21 Reputation points

2023-06-06T05:18:53.21+00:00

I added more data to the question, but all that has been stripped off. According to Diagnostic, the functions are throwing the following exception: FunctionInvocationCanceledException. The invocation request with id <GUID> was canceled before the request was sent to the worker. This means the code inside my function has not even been touched yet.

You can see more details about the exception here at StackOverflow : https://stackoverflow.com/q/76385900/994244

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Azure Functions ( Http Triggered) started throwing Task Canceled Exception randomly

Your answer