Azure 函数：当函数自动缩放时，函数被多次调用

Question

在Azure Queue中为queueitem添加了单个条目，但为同一个queueitem多次调用了函数，无法理解是什么问题，我们在函数中使用了Async/Await，代码也是Async，下面是Azure函数设置，

下面是功能代码，

public class CreateTempVMTempTablesFunction
{
    private static Container container;
    private static IProcessingFunctionService _processingFunctionService; 
    private static IAzureFunctionFailuresRepository _azureFunctionFailuresRepository;
    private static ITrackLogEventsService _trackLogEventsService;

    [FunctionName("CreateTempVMTempTablesFunction")]
    public static async Task Run([QueueTrigger("%environment-plan%" + AzureFunctionConstants.CreateTempTableQueue, Connection = "AzureWebJobsStorage")]string myQueueItem, ILogger log)
    {
        string ErrorMessage = string.Empty;
        var start = DateTime.Now;
        FunctionStatusEnum IsSuccess = FunctionStatusEnum.Success;
        log.LogInformation($"C# Queue trigger function processed: {myQueueItem} - {start}");

        Guid tempid = new Guid(myQueueItem);
        TempVM tempVM = new TempVM();
        try
        {
            container = BusinessLogic.Helpers.SimpleInjectorWebApiInitializer.InitializeSingleton();;
           
            _processingFunctionService = container.GetInstance<IProcessingFunctionService>();
            _azureFunctionFailuresRepository = container.GetInstance<IAzureFunctionFailuresRepository>();
            _trackLogEventsService = container.GetInstance<ITrackLogEventsService>();

            tempVM = await _processingFunctionService.GetById(tempid);
            if (tempVM != null)
            {
                FunctionStatusEnum IsAlreadyPerformed = await _azureFunctionFailuresRepository.GetAzureFunctionFailureStatus(AzureFunctionConstants.CreateTempVMTempTablesFunction, tempVM.Id);

                if (IsAlreadyPerformed != FunctionStatusEnum.Success)
                {
                        ResponseData response = await _processingFunctionService.CreateTempVMTempTables(tempid);
                }
                else
                {
                    ErrorMessage = AzureFunctionConstants.FunctionAlreadyProcessed;
                }
            }
            else
            {
                ErrorMessage = AzureFunctionConstants.TempVMNotFound;
            }
        }
        catch (Exception ex)
        {
            IsSuccess = FunctionStatusEnum.Failed;
            ErrorMessage = ex.ToString();
        }
        finally
        {
            AzureFunctionFailures azureFunctionFailures = new AzureFunctionFailures()
            {
                Id = Guid.NewGuid(),
                FunctionName = AzureFunctionConstants.CreateTempVMTempTablesFunction,
                QueueItem = myQueueItem,
                ErrorMessage = ErrorMessage,
                StartTime = start,
                EndTime = DateTime.Now,
                FailureTypeId = tempid,
                FunctionStatus = IsSuccess,
                ProcessTime = (DateTime.Now - start).TotalMilliseconds,
            };
            await _azureFunctionFailuresRepository.Add(azureFunctionFailures);
        }
        log.LogInformation($"End Time : {DateTime.Now} - QueueItem {myQueueItem}");
        log.LogInformation($"Total Time : {DateTime.Now - start} - QueueItem {myQueueItem}");
    }
}

我检查了在队列中添加条目的代码，但只为一个队列项添加了一个条目。 当为不同的队列项在同一队列中添加多个条目时发生此问题（即我仅添加了 24 个请求的负载测试），当运行单个队列时，则不会发生这种情况，我们的功能在具有自动缩放功能的应用服务计划中

Answer 1

正如评论中提到的。 只需在函数的应用程序设置中将WEBSITE_MAX_DYNAMIC_APPLICATION_SCALE_OUT值设置为1 。