Handle exceptions in Azure timer functions

Question

I have a timer function that runs every 15 minutes (pseudo-code below). Due to a vendor issue in the 3rd party service, we would see failures followed by stretches (45 minutes, 6 hours, etc.) where the timer function did not execute.

public static class ThirdPartySynchronization { private static readonly ThirdPartySdk s_thirdPartySdk = new ThirdPartySdk(); [FunctionName("TimerTriggerCSharp")] public static void Run([TimerTrigger("0 */5 * * * *")]TimerInfo myTimer, ILogger log) { try { await s_thirdPartySdk.Synchronize(); } catch (Exception ex) { log.Error(ex.Message); throw; } } }

When I run the function locally and hit the same error sate, the throw occasionally crashes the func.exe host, which made me wonder if a similar issue occurs in our Consumption Plan.

I don't see a lot of guidance in Azure's documentation or best practices for how to handle exceptions (or mark a timer function as non-success). Any recommended pattern for handling exceptional behavior in C# Azure timer functions?

If you are using consumption plan execution time can't be more then 10 minutes: learn.microsoft.com/en-us/azure/azure-functions/… — Alexey Rodionov
– Alexey Rodionov, Commented Dec 4, 2018 at 1:06

Alexey Rodionov · Accepted Answer · 2018-12-04 01:15:11Z

There is no guidlance for timertrigger: https://learn.microsoft.com/en-us/azure/azure-functions/functions-bindings-error-pages

Best what you can do:

Analyze function execution logs: https://learn.microsoft.com/en-us/azure/azure-functions/functions-monitoring
Manage function timeout: https://learn.microsoft.com/en-us/azure/azure-functions/functions-host-json#functiontimeout. For consumption plan it's 10 minutes max.

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