azure - Azure Function App 是否同时运行多个实例？

Question

如果我有一个像这样的函数应用

   public static class Function1
    {
        private static readonly HttpClient httpClient = new HttpClient();

        [FunctionName("SomeRandomFunction")]
        public static async Task<IActionResult> Run([HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = null)] HttpRequest req, ILogger log)
        {
            ulong i = 0;
            Thread.Sleep(10000);
            return (ActionResult)new OkObjectResult($"Hello thread Finished.");
        }
}

是否创建了不同的函数实例，例如移动设备同时触发该功能？

我是从这个quote推断出这一点的“当您使用高级计划时，将根据传入事件的数量添加和删除 Azure Functions 主机的实例，就像使用计划一样”。我参加的是S1计划。

但是，当我像上面那样在函数“SomeRandomFunction”中测试 thread.sleep 时，从两个不同的私有(private)浏览器窗口对同一函数进行两次调用，第二次调用仅在第一个调用完成时才开始。如果可以创建同一函数应用的多个实例，为什么会发生这种情况？

或者多线程实现是否需要同时运行多个实例？

谢谢

Answer 1

Are different instances of the function created if different e.g. mobile devices trigger the function at the same time?

是的。来自文档:

The unit of scale for Azure Functions is the function app. When the function app is scaled out, additional resources are allocated to run multiple instances of the Azure Functions host. Conversely, as compute demand is reduced, the scale controller removes function host instances. The number of instances is eventually scaled in to zero when no functions are running within a function app.

Azure Functions scale and hosting