Hi all, I'm trying to implement ExponentialBackoffRetry in one of my Azure Functions. Is there a way to retrieve the values (Max Retry, min delay, max delay) from App Settings instead of hardcoding them? Thank you [FunctionName("MyFunction")] [ExponentialBackoffRetry(10, "00:00:45", "00:05:00")] public async Task Run([CosmosDBTrigger( /*my trigger settings here*/ ) { //my code }

Make sure that the values you want to use (Max Retry, Min Delay, Max Delay) are set in your Application Settings in the Azure Portal or your local.settings.json file during local development. 2. In your local.settings.json, it would look something like this: { "IsEncrypted": false, "Values": { "AzureWebJobsStorage": "your_storage_account_connection_string", "FUNCTIONS_WORKER_RUNTIME": "dotnet", "MaxRetry": "10", "MinDelay": "00:00:45", "MaxDelay": "00:05:00" // other settings if you have of course } } Then in your Azure Function, use the % syntax to reference these settings in the ExponentialBackoffRetry attribute. For example: [FunctionName("MyFunction")] [ExponentialBackoffRetry("%MaxRetry%", "%MinDelay%", "%MaxDelay%")] public async Task Run([CosmosDBTrigger(/*my trigger settings here*/)] ...) { // Write your code here } %MaxRetry% , %MinDelay% , and %MaxDelay% are placeholders for the actual values in your application settings. Just extra info at runtime, AF will replace these placeholders with the corresponding values from your configuration.

ExponentialBackoffRetry dynamic parameter value

Accepted answer

Amira Bedhiafi 24,336 Reputation points

2024-01-21T13:14:46.4666667+00:00
Make sure that the values you want to use (Max Retry, Min Delay, Max Delay) are set in your Application Settings in the Azure Portal or your local.settings.json file during local development. 2. In your local.settings.json, it would look something like this:

{ "IsEncrypted": false, "Values": { "AzureWebJobsStorage": "your_storage_account_connection_string", "FUNCTIONS_WORKER_RUNTIME": "dotnet", "MaxRetry": "10", "MinDelay": "00:00:45", "MaxDelay": "00:05:00" // other settings if you have of course } }

Then in your Azure Function, use the % syntax to reference these settings in the ExponentialBackoffRetry attribute. For example:

[FunctionName("MyFunction")] [ExponentialBackoffRetry("%MaxRetry%", "%MinDelay%", "%MaxDelay%")] public async Task Run([CosmosDBTrigger(/*my trigger settings here*/)] ...) { // Write your code here }

%MaxRetry%, %MinDelay%, and %MaxDelay% are placeholders for the actual values in your application settings. Just extra info at runtime, AF will replace these placeholders with the corresponding values from your configuration.
Please sign in to rate this answer.

1 person found this answer helpful.
Wendy Susanto 20 Reputation points

2024-01-21T14:46:33.1466667+00:00

Hi Amira, thank you for answering my question. I have added my settings to my local.settings.json file. The file looks like this:

{ "IsEncrypted": false, "Values": { //other settings "FormListenerMaxRetryCount": "10", "FormListenerMinRetryInterval": "00:00:30", "FormListenerMaxRetryInterval": "00:05:00" } }

However, it seems that the ExponentialBackoffRetry (screenshot attached) does not accept a string value as its first parameter. Do you have any suggestions for this?"

Amira Bedhiafi 24,336 Reputation points

2024-01-21T14:56:14.63+00:00

You can manually read these settings in your function and then apply the retry logic.
You can use Environment.GetEnvironmentVariable to retrieve your settings from local.settings.json then parse the max retry count to an integer and the time settings to TimeSpan objects, here is an example I found online (Instead of using the ExponentialBackoffRetry attribute, implement the retry logic within your function code):

public class Function1 { [FunctionName("Function1")] public async Task Run([CosmosDBTrigger(...)] ...) { var maxRetryCount = int.Parse(Environment.GetEnvironmentVariable("FormListenerMaxRetryCount")); var minRetryInterval = TimeSpan.Parse(Environment.GetEnvironmentVariable("FormListenerMinRetryInterval")); var maxRetryInterval = TimeSpan.Parse(Environment.GetEnvironmentVariable("FormListenerMaxRetryInterval")); int retryCount = 0; TimeSpan delay = minRetryInterval; while (retryCount < maxRetryCount) { try { // Your main function logic here // If the action is successful, break from the loop break; } catch (Exception ex) { // Log the exception if necessary // Increment the retry count retryCount++; // Wait for the delay period before retrying await Task.Delay(delay); // Increase the delay for the next retry delay = TimeSpan.FromTicks(Math.Min(maxRetryInterval.Ticks, delay.Ticks * 2)); // If max retries have been reached, rethrow the exception if (retryCount >= maxRetryCount) { throw; } } } } }

Wendy Susanto 20 Reputation points

2024-01-21T15:29:53.4566667+00:00

Thanks for your suggestion! It seems that the only way to dynamically retrieve the retry configuration from the app settings is by manually implementing our retry logic.

Amira Bedhiafi 24,336 Reputation points

2024-01-21T19:42:58.6866667+00:00

Yes sometimes it is challenging to implement something with specific technologies! Good luck :) Don't forget to accept my answer if it helped !

Frank Reerink 0 Reputation points

2024-07-22T11:19:22.1866667+00:00

Which versions are you using. This doesn't work (anymore)
Sign in to comment

Use comments to ask for clarification, additional information, or improvements to the question.

Share via

ExponentialBackoffRetry dynamic parameter value

0 additional answers

Your answer