间歇性WCF服务失败

时间：2013-11-05 20:10:09

标签： wcf iis-7.5

我有一个间歇性失败的WCF服务。当它失败时，我可以从svctraceviewer信息中看到两个独立的线程同时请求“连接信息”。其中一个线程成功，另一个线程因此错误而失败：“使用WebContentTypeMapper时遇到意外的异常。”除了POST主体中的某些值之外，请求是相同的，因此我假设真正的问题与请求“连接信息”时的冲突有关。在此“连接信息”请求期间，我无法找到有关WCF运行时正在执行的操作的任何信息。

我应该注意客户端POST未编码的XML并使用application / xml的HTTP Content-Type标头，所以我有一个自定义绑定来接受xml流。我无法改变客户端POST到我的服务的方式。

思想？

的web.config 

<system.serviceModel>
    <services>
        <service name="SAPCallbackHandlerNamespace.SAPCallbackHandler" behaviorConfiguration="">
            <endpoint address="" binding="customBinding" contract="SAPCallbackHandlerNamespace.ISAPCallbackHandler" behaviorConfiguration="webBehavior" bindingConfiguration="customBindingHTTP" />
            <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />
            <host>
                <baseAddresses>
                    <add baseAddress="http://localhost/service.svc/" />
                </baseAddresses>
            </host>
        </service>
    </services>
    <bindings>
        <customBinding>
            <binding name="customBindingHTTP">
                <webMessageEncoding webContentTypeMapperType="SAPCallbackHandlerNamespace.RawContentTypeMapper, SAPCallbackHandler, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
                <httpTransport manualAddressing="true" maxReceivedMessageSize="524288000" transferMode="Streamed" />
            </binding>
        </customBinding>
    </bindings>
    <behaviors>
        <serviceBehaviors>
            <behavior>
                <serviceMetadata httpGetEnabled="true" httpsGetEnabled="true"/>
                <serviceDebug includeExceptionDetailInFaults="false" />
            </behavior>
        </serviceBehaviors>
        <endpointBehaviors>
            <behavior name="webBehavior">
                <webHttp/>
            </behavior>
        </endpointBehaviors>
    </behaviors>
</system.serviceModel>

代码

[ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall, ConcurrencyMode = ConcurrencyMode.Single)]
[DataContract]
public class SAPCallbackHandler : ISAPCallbackHandler
{
    public string ParseIncomingXML(Stream incomingXML)
    {
        ...
    }
}

public class RawContentTypeMapper : WebContentTypeMapper
{
    public override WebContentFormat GetMessageFormatForContentType(string contentType)
    {
        if (contentType.Contains("text/xml") || contentType.Contains("application/xml"))
        {
            return WebContentFormat.Raw;
        }
        else
        {
            return WebContentFormat.Default;
        }
    }
}

接口

[ServiceContract]
public interface ISAPCallbackHandler
{
    [OperationContract]
    [WebInvoke(Method = "POST", RequestFormat = WebMessageFormat.Xml, BodyStyle = WebMessageBodyStyle.Bare)]
    string ParseIncomingXML(Stream incomingXML);
}

'连接信息'跟踪：

<E2ETraceEvent xmlns="http://schemas.microsoft.com/2004/06/E2ETraceEvent">
    <System xmlns="http://schemas.microsoft.com/2004/06/windows/eventlog/system">
        <EventID>262168</EventID>
        <Type>3</Type>
        <SubType Name="Information">0</SubType>
        <Level>8</Level>
        <TimeCreated SystemTime="2013-11-04T16:52:26.3746976Z" />
        <Source Name="System.ServiceModel" />
        <Correlation ActivityID="{00000000-0000-0000-0000-000000000000}" />
        <Execution ProcessName="w3wp" ProcessID="3992" ThreadID="7" />
        <Channel />
        <Computer>TX-APP-J01</Computer>
    </System>
    <ApplicationData>
        <TraceData>
            <DataItem>
                <TraceRecord xmlns="http://schemas.microsoft.com/2004/10/E2ETraceEvent/TraceRecord" Severity="Information">
                    <TraceIdentifier>http://msdn.microsoft.com/en-US/library/System.ServiceModel.Channels.ConnectToIPEndpoint.aspx</TraceIdentifier>
                    <Description>Connection information.</Description>
                    <AppDomain>/LM/W3SVC/2/ROOT-1-130280558217413872</AppDomain>
                    <Source>System.ServiceModel.Activation.HostedHttpTransportManager/4720237</Source>
                    <ExtendedData xmlns="http://schemas.microsoft.com/2006/08/ServiceModel/DictionaryTraceRecord">
                        <LocalEndpoint>10.198.147.12:80</LocalEndpoint>
                        <RemoteEndpoint>163.231.6.69:24074</RemoteEndpoint>
                    </ExtendedData>
                </TraceRecord>
            </DataItem>
        </TraceData>
    </ApplicationData>
</E2ETraceEvent>

错误跟踪：

<E2ETraceEvent xmlns="http://schemas.microsoft.com/2004/06/E2ETraceEvent">
    <System xmlns="http://schemas.microsoft.com/2004/06/windows/eventlog/system">
        <EventID>131075</EventID>
        <Type>3</Type>
        <SubType Name="Error">0</SubType>
        <Level>2</Level>
        <TimeCreated SystemTime="2013-11-04T16:52:26.4370984Z" />
        <Source Name="System.ServiceModel" />
        <Correlation ActivityID="{00000000-0000-0000-0000-000000000000}" />
        <Execution ProcessName="w3wp" ProcessID="3992" ThreadID="7" />
        <Channel />
        <Computer>TX-APP-J01</Computer>
    </System>
    <ApplicationData>
        <TraceData>
            <DataItem>
                <TraceRecord xmlns="http://schemas.microsoft.com/2004/10/E2ETraceEvent/TraceRecord" Severity="Error">
                    <TraceIdentifier>http://msdn.microsoft.com/en-US/library/System.ServiceModel.Diagnostics.ThrowingException.aspx</TraceIdentifier>
                    <Description>Throwing an exception.</Description>
                    <AppDomain>/LM/W3SVC/2/ROOT-1-130280558217413872</AppDomain>
                    <Exception>
                        <ExceptionType>System.ServiceModel.CommunicationException, System.ServiceModel, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</ExceptionType>
                        <Message>An unexpected exception was encountered when using the WebContentTypeMapper.</Message>
                        <StackTrace>   at System.ServiceModel.Channels.WebMessageEncoderFactory.WebMessageEncoder.TryGetContentTypeMapping(String contentType, WebContentFormat&amp;amp; format)
   at System.ServiceModel.Channels.WebMessageEncoderFactory.WebMessageEncoder.IsContentTypeSupported(String contentType)
   at System.ServiceModel.Channels.HttpInput.ValidateContentType()
   at System.ServiceModel.Channels.HttpInput.ParseMessageAsyncResult.BeginParse()
   at System.ServiceModel.Channels.HttpInput.BeginParseIncomingMessage(HttpRequestMessage httpRequestMessage, AsyncCallback callback, Object state)
   at System.ServiceModel.Channels.HttpPipeline.EmptyHttpPipeline.BeginParseIncomingMessage(AsyncCallback asynCallback, Object state)
   at System.ServiceModel.Channels.HttpPipeline.EmptyHttpPipeline.BeginProcessInboundRequest(ReplyChannelAcceptor replyChannelAcceptor, Action dequeuedCallback, AsyncCallback callback, Object state)
   at System.ServiceModel.Channels.HttpChannelListener`1.HttpContextReceivedAsyncResult`1.ProcessHttpContextAsync()
   at System.ServiceModel.Channels.HttpChannelListener`1.BeginHttpContextReceived(HttpRequestContext context, Action acceptorCallback, AsyncCallback callback, Object state)
   at System.ServiceModel.Activation.HostedHttpTransportManager.HttpContextReceived(HostedHttpRequestAsyncResult result)
   at System.ServiceModel.Activation.HostedHttpRequestAsyncResult.HandleRequest()
   at System.ServiceModel.Activation.HostedHttpRequestAsyncResult.BeginRequest()
   at System.ServiceModel.Activation.HostedHttpRequestAsyncResult.OnBeginRequest(Object state)
   at System.Runtime.IOThreadScheduler.ScheduledOverlapped.IOCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* nativeOverlapped)
   at System.Runtime.Fx.IOCompletionThunk.UnhandledExceptionFrame(UInt32 error, UInt32 bytesRead, NativeOverlapped* nativeOverlapped)
   at System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* pOVERLAP)
</StackTrace>
                        <ExceptionString>System.ServiceModel.CommunicationException: An unexpected exception was encountered when using the WebContentTypeMapper. ---&amp;gt; System.IO.IOException: The process cannot access the file 'c:\sapqueueservice\log.txt' because it is being used by another process.
   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options, String msgPath, Boolean bFromProxy)
   at System.IO.FileStream..ctor(String path, FileMode mode)
   at SAPCallbackHandlerNamespace.RawContentTypeMapper.GetMessageFormatForContentType(String contentType)
   at System.ServiceModel.Channels.WebMessageEncoderFactory.WebMessageEncoder.TryGetContentTypeMapping(String contentType, WebContentFormat&amp;amp; format)
   --- End of inner exception stack trace ---</ExceptionString><InnerException><ExceptionType>System.IO.IOException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</ExceptionType><Message>The process cannot access the file 'c:\sapqueueservice\log.txt' because it is being used by another process.</Message><StackTrace>   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options, String msgPath, Boolean bFromProxy)
   at System.IO.FileStream..ctor(String path, FileMode mode)
   at SAPCallbackHandlerNamespace.RawContentTypeMapper.GetMessageFormatForContentType(String contentType)
   at System.ServiceModel.Channels.WebMessageEncoderFactory.WebMessageEncoder.TryGetContentTypeMapping(String contentType, WebContentFormat&amp;amp; format)</StackTrace><ExceptionString>System.IO.IOException: The process cannot access the file 'c:\sapqueueservice\log.txt' because it is being used by another process.
   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options, String msgPath, Boolean bFromProxy)
   at System.IO.FileStream..ctor(String path, FileMode mode)
   at SAPCallbackHandlerNamespace.RawContentTypeMapper.GetMessageFormatForContentType(String contentType)
   at System.ServiceModel.Channels.WebMessageEncoderFactory.WebMessageEncoder.TryGetContentTypeMapping(String contentType, WebContentFormat&amp;amp; format)</ExceptionString>
                        </InnerException>
                    </Exception>
                </TraceRecord>
            </DataItem>
        </TraceData>
    </ApplicationData>
</E2ETraceEvent>

运行的服务：IIS 7.5，.NET 4.5，Windows Server 2008 R2

1 个答案:

答案 0 :(得分：0)

此消息引人注目：

System.IO.IOException：进程无法访问文件'c：\ sapqueueservice \ log.txt'，因为它正由另一个进程使用。

看起来某个进程正在锁定此文件。

尝试使用Process Explorer找出哪个进程有句柄。

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