c# - 同一台服务器上的 WCF 服务之间的响应缓慢

Question

我在 UAT 环境中遇到了一个非常奇怪的问题。我有两个相互通信的 WCF 服务。在高层次上，我的 Web 应用程序与业务层通信，然后从那里将 wcf 请求传递到处理所有请求并返回响应的事务层。我面临的问题是事务层接收业务层发送的请求大约需要 1 分钟。 WCF 服务部署在同一台服务器上，并且此应用程序设置在生产中运行完美，所以我不确定发生了什么......

示例:

Web 前端向业务层发送一个wcf 请求以获取所有广告的列表。业务层执行一些安全检查(我已从示例中删除)，然后通过另一个 WCF 请求将请求简单地传递到事务层。但是事务层需要1分钟才能收到这个请求。

业务层:

    public partial class AdsManagementService : IAdsManagementService
{
    public ListAdvertisementResponse ListAdvertisement(ListAdvertisementRequest request)
    {
        LogManager.Write("Initiated AdsManagement.AdsManagentService.ListAdvertisement()", LogCategory.Trace.ToString());

        var response = new ListAdvertisementResponse();
        response.Advertisements = new List<Advertisement>();

        LogManager.Write("Authentication token validated in AdsManagement.AdsManagentService.ListAdvertisement()", LogCategory.Event.ToString());
        var client = new AdService.AdsManagementServiceClient();

        try
        {
            response = client.ListAdvertisement(request);
            LogManager.Write("response received by AdsManagement.AdsManagentService.ListAdvertisement()", LogCategory.Event.ToString());
        }
        finally
        {
            try
            {
                client.Close();
            }
            catch (Exception ex)
            {
                LogManager.ExceptionHandler(ex);
            }
        }
    }
}

交易层

我在每个方法调用的开始/结束处添加了日志跟踪 (BEGIN,END)，以显示处理该方法需要多长时间。

 public ListAdvertisementResponse ListAdvertisement(ListAdvertisementRequest request)
    {
        LogManager.Write("BEGIN - ListAdvertisement", LogCategory.Event);
        var response = new ListAdvertisementResponse();

        try
        {                
            response.Advertisements = new List<AdvertisementType>();

            var ads = AdvertisementDataContextInstance.Advertisements;

            foreach (var ad in ads)
            {
                AdvertisementType advertisement = ConvertToAdvertisementType(ad);

                string filePath = AdFilePath + @"\" + ad.Code;

                if (Directory.Exists(filePath))
                {
                    string[] files = Directory.GetFiles(filePath);

                    foreach (string file in files)
                    {
                        advertisement.Files.Add(file);
                    }
                }

                response.Advertisements.Add(advertisement);
            }
        }
        catch (Exception ex)
        {
            response.ErrorAction = ResponseActionEnum.GeneralException;
            response.ErrorDetails = ex.Message;
            response.ErrorMessage = "Unable to list advertisements.";
        }

        LogManager.Write("END - ListAdvertisement", LogCategory.Event);
        return response;
    }

业务层日志跟踪

**Timestamp: 2/04/2013 9:23:08 AM**
Thread Name: 
Category: Trace
Severity: Information
Message: Initiated AdsManagement.AdsManagentService.ListAdvertisement()

**Timestamp: 2/04/2013 9:23:08 AM**
Thread Name: 
Category: Event
Severity: Information
Message: Authentication token validated in AdsManagement.AdsManagentService.ListAdvertisement()


**Timestamp: 2/04/2013 9:24:02 AM**
Thread Name: 
Category: Event
Severity: Information
Message: Response received by AdsManagement.AdsManagentService.ListAdvertisement()

**Timestamp: 2/04/2013 9:24:02 AM**
Thread Name: 
Category: Trace
Severity: Information
Message: Completed AdsManagement.AdsManagentService.ListAdvertisement()

**TRANSACTION LAYER LOG TRACE**

**2/04/2013 9:24:02 AM** - BEGIN - ListAdvertisement

**2/04/2013 9:24:02 AM** - BEGIN - ConvertToAdvertisementType

2/04/2013 9:24:02 AM - END - ConvertToAdvertisementType

2/04/2013 9:24:02 AM - BEGIN - ConvertToAdvertisementType

2/04/2013 9:24:02 AM - END - ConvertToAdvertisementType

2/04/2013 9:24:02 AM - BEGIN - ConvertToAdvertisementType

2/04/2013 9:24:02 AM - END - ConvertToAdvertisementType

**2/04/2013 9:24:02 AM** - END - ListAdvertisement


As you can see, there is roughly a 1 minute delay before the Transaction layer receives the request. I have no idea what is causing this. I think it might be the logging system (Microsoft.Practices.EnterpriseLibrary.Logging). I've noticed that it creates a separate log file almost every time it receives a request, almost as if the original log file is being kept open which stops it from writing to that file. Perhaps there is a 1 minute timeout on the logging before it decides to create a new log file and write to that?

I have the following log files in the logging directory for today's date: Every time I send a new request to the Transaction Layer, there is a 1min delay and then it creates a new log file:

RTITraceGeneral.log          02/04/2013 9:20 AM

RTIEvent.log                 02/04/2013 9:20 AM

c9d64c18-80d9-4993-b167-2070190fce51RTITraceGeneral.log    02/04/2013 9:20 AM

a7acf427-a919-4fe4-9832-d186e9e28c0cRTIEvent.log           02/04/2013 9:24 AM

8e35dbdc-3c94-4e93-866a-3affcbf5f082RTITraceGeneral.log    02/04/2013 9:24 AM 

Answer 1

我设法弄清楚了。 IIS 中的 WCF 应用程序被设置为多进程应用程序池，这似乎造成了问题。更改此设置后，对所有 WCF 服务使用单个进程应用程序池，日志文件现在创建在单个文件中，不再有延迟!