单例 Azure 函数作为单独的实例运行-C#/.NET问题

Singleton Azure function running as separate instances(单例 Azure 函数作为单独的实例运行)

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问题描述

我们有一个 Azure 函数，它应该同时处理多个服务总线触发器，我假设正在发生的事情是它被拆分到多个实例中，这导致了我们端的一些并发问题.

We have an Azure function that is supposed to be handling several service bus triggers at the same time and what I assume is happening is that it is being split across several instances which is causing some concurrency problems on our end.

我们需要我们的函数充当单例，这样我们就可以一次处理一个请求而不会发生任何冲突.根据我们在本文中的研究 (https://docs.microsoft.com/en-us/azure/app-service/webjobs-sdk-how-to#singleton-attribute) 我们应该能够做到这一点.

We need our function to act as a singleton so we can process requests one at a time without any collisions. From what we looked into in this article (https://docs.microsoft.com/en-us/azure/app-service/webjobs-sdk-how-to#singleton-attribute) we should be able to accomplish this.

我们的函数如下所示:

[Microsoft.Azure.WebJobs.Singleton(Mode = SingletonMode.Listener)]
[FunctionName("AccountCreatedSubscriber")]
public static void Run([ServiceBusTrigger("accountscontacts-account-created", "license-keys", Connection = "FBISEventBus")]BrokeredMessage message, ILogger log)
{
    log.LogInformation($"{{ Message received from accountscontacts-account-created topic }}");

    // Do Work
    log.LogInformation($"{{ Message sent to account creation handler }}");
}


为了备份，我们的 host.json 文件中也有这个，
And for backup we also have this in our host.json file,
{
  "serviceBus": { "maxConcurrentCalls": 1 }
}

但无论出于何种原因，我们的函数仍在并行运行.有什么想法吗?
But for whatever reason our functions are still running parallel. Any ideas?
推荐答案

如果您的函数在消耗计划中，请在 WEBSITE_MAX_DYNAMIC_APPLICATION_SCALE_OUT 设置为 1us/azure/azure-functions/functions-app-settings#websitemaxdynamicapplicationscaleout" rel="noreferrer">应用程序设置.

If your function is on Consumption plan, set WEBSITE_MAX_DYNAMIC_APPLICATION_SCALE_OUT to 1 in Application settings.

在门户中检查您的 Azure Function 运行时版本(平台功能> 函数应用设置).如果是~2，我们需要在 host.json 如下.

Check your Azure Function runtime version in portal(Platform features> Function app settings). If it's ~2, we need to modify service bus setting in host.json as below.

{
    "version": "2.0",
    "extensions": {
        "serviceBus": {
            "messageHandlerOptions": {
               "maxConcurrentCalls": 1
            }
        }
    }
}

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