C# 如何解决WCF中的System.ServiceModel.ServerTooBusyException？

我正在开发一个平均每天访问50000次（约140000次页面浏览）的网站。 我正在使用

WCF

作为我的服务，使用

InstanceContextMode=InstanceContextMode.PerCall

另外，我正在使用异步方法调用WCF服务，
最近，我在一些页面和一些请求上收到以下异常消息：

Exception Type: System.ServiceModel.ServerTooBusyException
Exception Message: The HTTP service located at http://localhost:8090/SmartService.svc is unavailable.  This could be because the service is too busy or because no endpoint was found listening at the specified address. Please ensure that the address is correct and try accessing the service again later.
Stack Trace:    at System.Runtime.AsyncResult.End[TAsyncResult](IAsyncResult result)
   at System.ServiceModel.Channels.ServiceChannel.SendAsyncResult.End(SendAsyncResult result)
   at System.ServiceModel.Channels.ServiceChannel.EndCall(String action, Object[] outs, IAsyncResult result)
   at System.ServiceModel.Channels.ServiceChannelProxy.TaskCreator.<>c__DisplayClass5`1.<CreateGenericTask>b__4(IAsyncResult asyncResult)
   at System.Threading.Tasks.TaskFactory`1.FromAsyncCoreLogic(IAsyncResult iar, Func`2 endFunction, Action`1 endAction, Task`1 promise, Boolean requiresSynchronization)
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Smartiz.ClientServices.ContentService.<GetContentsByIdsAsync>d__18.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at Smartiz.UI.Controllers.CompareController.<FillRequiredFields>d__36.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Smartiz.UI.Controllers.CompareController.<GetDevices>d__4b.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at Smartiz.UI.Controllers.CompareController.<Index>d__73.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Web.Mvc.Async.TaskAsyncActionDescriptor.EndExecute(IAsyncResult asyncResult)
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass37.<BeginInvokeAsynchronousActionMethod>b__36(IAsyncResult asyncResult)
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3d()
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>c__DisplayClass46.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3f()
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>c__DisplayClass46.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3f()
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>c__DisplayClass46.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3f()
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.AsyncInvocationWithFilters.<>c__DisplayClass46.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3f()
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass33.<BeginInvokeActionMethodWithFilters>b__32(IAsyncResult asyncResult)
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass21.<>c__DisplayClass2b.<BeginInvokeAction>b__1c()
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass21.<BeginInvokeAction>b__1e(IAsyncResult asyncResult)
   at System.Web.Mvc.Controller.<BeginExecuteCore>b__1d(IAsyncResult asyncResult, ExecuteCoreState innerState)
   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult)
   at System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult)
   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult)
   at System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__5(IAsyncResult asyncResult, ProcessRequestState innerState)
   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult)
   at System.Web.HttpApplication.CallHandlerExecutionStep.OnAsyncHandlerCompletion(IAsyncResult ar)

        =========== Inner Exception ===========
        Exception Type: System.Net.WebException
        Exception Message: The remote server returned an error: (503) Server Unavailable.

---

我的意思是

服务节流maxConcurrentCalls=“2147483647”maxConcurrentInstances=“2147483647”maxConcurrentSessions=“2147483647”

首先检查应用程序池是否正常。 如果您的应用程序在一段时间内产生太多异常，您将收到相同的错误消息

---

根据我的经验，如果相关属性

maxConcurrentInstances

和

maxConcurrentSessions

像这里一样正确设置，那么当发生此错误时，web.config中会出现一些错误。

增加并发调用是很好的，但可能只会延迟不可避免的事件。您的WCF服务执行什么类型的操作？我看到您正在使用

async

调用它。但是，如果您的服务随后执行任何其他I/O，那么它们也应该是异步的。e、 g.数据库；文件etcdid您是否使用serviceThrottling和working？您是否改进了性能

WCF服务

和

IIS服务器

？@mohammad dayyan在中心位置捕获所有异常会更容易。有两个重要的接口：

IErrorHandler

和

IServiceBehavior

。查看一下，并检查是否有任何未处理的异常。如果没有，那么我们必须深入研究。有时WCF没有完全加载您的配置，并且在运行时缺少一些绑定。如果加载失败，那么讨论配置是毫无意义的；-） <system.serviceModel> <services> <service name="Smartiz.WcfService.SmartService" behaviorConfiguration="ServiceBehavior"> <host> <baseAddresses> <add baseAddress="http://localhost/" /> </baseAddresses> </host> <endpoint address="" binding="basicHttpBinding" contract="Smartiz.WcfService.ISmartService" bindingConfiguration="basicHttpBinding"> <identity> <dns value="localhost" /> </identity> </endpoint> <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" /> </service> </services> <behaviors> <serviceBehaviors> <behavior name="ServiceBehavior"> <serviceThrottling maxConcurrentCalls="2147483647" maxConcurrentInstances="2147483647" maxConcurrentSessions="2147483647" /> <serviceMetadata httpGetEnabled="true" httpsGetEnabled="true" /> <dataContractSerializer maxItemsInObjectGraph="2147483647" /> <serviceDebug includeExceptionDetailInFaults="true" /> </behavior> </serviceBehaviors> </behaviors> <protocolMapping> <add scheme="https" binding="basicHttpsBinding" /> <add scheme="http" binding="basicHttpBinding" /> </protocolMapping> <serviceHostingEnvironment aspNetCompatibilityEnabled="true" multipleSiteBindingsEnabled="true" minFreeMemoryPercentageToActivateService="0" /> <bindings> <basicHttpBinding> <binding name="basicHttpBinding" maxReceivedMessageSize="2147483647" messageEncoding="Text" textEncoding="utf-8" maxBufferPoolSize="2147483647"> <readerQuotas maxDepth="2147483647" maxStringContentLength="2147483647" maxArrayLength="2147483647" maxBytesPerRead="2147483647" maxNameTableCharCount="2147483647" /> <security mode="None"> </security> </binding> </basicHttpBinding> </bindings> </system.serviceModel>