How can I return error from a task in azure job batch so task may be reactivated?

Question

I want that when a job executes, in azure batch service, in case of an error to be able to correct data and then from portal just reactivate the task. The tasks are scheduled.

Currently I am just throwing Exceptions in case of failure. Those tasks cannot be reactivated.

But looking at other tasks I see this "Task failed "The task exited with an exit code representing a failure"" For that task I can click on 'Reactivate' button. How can I do the same?

This is my current code:

public class Program
    {
        private static void Main(string[] args)
        {
            try
            {
                ConsoleLogger.Info($"Job.DataTransfer process started! ");

                DataTransferSettings dataTransferSettings = DataTransferSettingsReader.GetDataTransferSettings();
                if (dataTransferSettings != null)
                {
                    ServicePointManager.DefaultConnectionLimit = int.MaxValue;

                    CopyData(dataTransferSettings);
                }
                else
                {
                    throw new Exception($"Process stopped, check data transfer settings.");
                }

                ConsoleLogger.Info($"Job.DataTransfer process completed.");
            }
            catch (Exception ex)
            {
                ConsoleLogger.Error(GetExceptionMessage(ex), ex);

                ExceptionDispatchInfo.Capture(ex).Throw();
            }
        }
}

I just didn't found yet any solution on how to do this.

Answer 1

So here is how you can handle it or the links below will give you good ideas how you can choose to handle.

Have a play around with the sample code here: c# samples reside here: https://github.com/Azure-Samples/azure-batch-samples/tree/master/CSharp/GettingStarted You will see some stuff here as to how you can handle the failing task: https://github.com/Azure-Samples/azure-batch-samples/blob/master/CSharp/GettingStarted/02_PoolsAndResourceFiles/JobSubmitter/JobSubmitter.cs

Pseudo code steps:

• Capture failed task.
• Get the non-zero exit code and if you think you can do something about it programmatically call foo_funct_correct and then try again.
• Task Failed events mentioned here: https://docs.microsoft.com/en-us/azure/batch/batch-task-fail-event

• Azure Batch Service Task Exit Code error

• Task exit code: https://docs.microsoft.com/en-us/azure/batch/error-handling#task-exit-codes

Extra stuff

• How to re-queue failed task: Azure Batch re-queue failed tasks

Hope this helps! Thanks =)