Question

我刚刚制作了一个WebApi（C＃，。net 4.5.2）并将其发布到网上。为了确保它正常工作，我开始测试它。

REST网络服务失败了＃34;压力＆＃34;测试。我每秒发送服务30 + - http请求，并收到这个典型的错误消息：

System.OperationCanceledException: The operation was canceled.
   at System.Threading.CancellationToken.ThrowOperationCanceledException()
   at System.Net.Http.HttpContentExtensions.<ReadAsAsyncCore>d__0`1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.Http.ModelBinding.FormatterParameterBinding.<ExecuteBindingAsyncCore>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.Http.Controllers.HttpActionBinding.<ExecuteBindingAsyncCore>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.Http.Controllers.ActionFilterResult.<ExecuteAsync>d__2.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at System.Web.Http.Controllers.ExceptionFilterResult.<ExecuteAsync>d__0.MoveNext()

日志中多次出现相同的错误。

当我进入特定的机器时，我看到CPU处于100％状态且RAM处于80％。这意味着，机器能够最好地处理负载。

问题

根据我上面提供的StackTrace，我无法理解我的代码中究竟出现了什么问题？
我的代码会自动扩展（托管在云端）。但是，新机器仅在5分钟后创建（取决于平均CPU> 50％）。我应该如何处理突发的HTTP请求？也许服务器应该说：＆＃34;嘿，在30秒内试试agian＆＃34;或类似的东西？什么是正确的解决方案？

Answer 1

System.OperationCanceledException: The operation was canceled.

这通常表示连接到服务的客户端在服务发送响应之前关闭了连接。就api层而言，这通常意味着您在建立http连接时指定了超时，或者您用于进行http调用的库具有默认超时。

您可能需要检查iis请求日志以查看出现了什么问题。由于这是在压力测试中发生的，我的猜测是你的服务缺少线程（阅读this了解更多细节）。您可能需要考虑请求处理程序的异步模型，以提高可伸缩性并更好地利用线程。（阅读this）

压力测试的OperationCanceledException

问题

1 个答案: