Does the Azure service bus client automatically use a retries for transient errors returned from the service bus?

Question

I have a very simple Azure function that uses an Http Trigger to send messages to an Azure Service Bus topic. I want to retry this function if the service bus returns a transient error. I have reviewed the default policy, but I don't know how to verify if it will be used out of the box. Do I need to add anything to my function code to ensure that such a retry policy will be used?

I also want to log messages that fail to be loaded onto the service bus after the retry policy fails. Should I wrap the contents of the function in a try-catch block and perform the log in the catch statement?

[FunctionName("MessageLoader")]
[return: ServiceBus("%Topic_Name%", Connection = "Topic_Connection")]
public static async Task<TopicMessage> Run(
    [HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = "domain/load-message")] HttpRequestMessage req)
{
    var stringRequestBody = await req.Content.ReadAsStringAsync();
    return JsonConvert.DeserializeObject<TopicMessage>(stringRequestBody);
}

krishg krishg · Accepted Answer · 2020-10-11T14:09:13

Yes, in this case (Service Bus binding), the default retry policy is used. You do not need to do anything special. To verify if it's working, you should see failed dependencies in app insights whenever a call fails if you integrated it correctly.

To your second question, if it fails after the retry gives up, you do not need to log manually. You should see error logged in app insights automatically captured if you integrated it correctly.

If you want to log custom error on failure, you should use Servicebus message sender by creating it yourself instead of Function output binding.

Does the Azure service bus client automatically use a retries for transient errors returned from the service bus?

1 Answers