Load Balancing Reporting WCF Service

[William Lim]

We are planning to use load balancer to improve our web service application performance. Since we are going to use this load balancer, we prefer not to use any session state in our application which means the session state will be completely disabled by default. The problem is now our web service application also hosts the Telerik Reporting WCF service. We just found out that this reporting service requires the session state to be enabled. Is there anyway for us to avoid this session state?

[Peter]

Hello Chris Skeen,

Currently the Telerik Reporting WCF service requires ASP.NET Session State and their is no way to avoid this requirement. However we will have in mind your requirement for future report service improvements

Best wishes,
Peter
the Telerik team

[Nurali]

Hello,
I don't like saying it but . Please help !
We use ASP.NET Session but still having problem with resources 
The images and charts not seen on reports.

Client
I
I
I
LoadBalancer (https)
---------------------App1 (State Server) -http 
---------------------App2-http


I've tried your file provider and shared App1's cache dictionary with App2. Such as \\App1Name\CacheFolder
My application pools use same user impersonation exist. Both App1 and App2 can write image files to CacheFolder but on the client side nothing seen.(white screen instead of charts)

Then I coded a CustomProvider  seen below, it works on my development environment, also works on our company server(no load balance just https [transport set]) .

But it does not work on Production.

Tell me what is wrong ?

Setting

 <section
             name="Telerik.Reporting"
             type="Telerik.Reporting.Configuration.ReportingConfigurationSection, Telerik.Reporting, Version=7.0.13.220, Culture=neutral, PublicKeyToken=a9d7983dfcc261be"
             allowLocation="true"
             allowDefinition="Everywhere"/>
  </configSections>
  <Telerik.Reporting>
    <Cache provider="DReportingResourceProvider">
      <Providers>
        <Provider name="DReportingResourceProvider" type="AHBSBus.DReportingResourceProvider, AHBSBus.Web,Version=1.3.8.0, Culture=neutral, PublicKeyToken=null">
          <Parameters>
            <Parameter name="cachingdirectory" value="D:\Apps\Cache" />
          </Parameters>
        </Provider>
      </Providers>
    </Cache>
  </Telerik.Reporting>

Code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using Telerik.Reporting.Cache.Interfaces;
using System.IO;
 
namespace AHBSBus
{
    public class DReportingResourceProvider : ICacheProvider
    {
 
        public ICache CreateCache(System.Collections.IDictionary parameters)
        {
            return new FileCacher(parameters);
        }
    }
 
    public class FileCacher : Telerik.Reporting.Cache.Interfaces.ICache
    {
        private string cachingdirectory = null;
        //readonly System.Collections.Generic.IDictionary<string, byte[]> cache;
 
        public FileCacher(System.Collections.IDictionary parameters)
        {            
            cachingdirectory = parameters["cachingdirectory"].ToString();            
        }
 
        public bool HasValue(string key)
        {
            string fullPath=Path.Combine(cachingdirectory,key);
            return File.Exists(fullPath);
        }
 
        public byte[] GetValue(string key)
        {
            string fullPath=Path.Combine(cachingdirectory,key);
            return File.ReadAllBytes(fullPath);
        }
 
        public void SetValue(string key, byte[] value)
        {
            string fullPath=Path.Combine(cachingdirectory,key);
            File.WriteAllBytes(fullPath, value);
        }
 
        public void Clear()
        {
            System.IO.DirectoryInfo directoryInfo = new DirectoryInfo(cachingdirectory);
 
            foreach (FileInfo file in directoryInfo.GetFiles())
            {
                file.Delete();
            }
            foreach (DirectoryInfo dir in directoryInfo.GetDirectories())
            {
                dir.Delete(true);
            }
        }
 
        public void Dispose()
        {
            this.Clear();
        }
    }
}

[Unknown]

You can check if you have set correctly the read permissions as well. Other than that you will have to compare the servers in order to find the differencies and see what is causing the trouble.

Also you might have problems with the handler, which is used for the images - check if you have correctly added it.

[Nurali]

Hi,
I just see an empty screen. 

BUT If I save report as pdf,tiff etc. I can see charts.
But I could not print as XPS. This gives us a clue about source of problem?

Soap actions seen,

SOAPAction: "Telerik.ReportService/IReportService/RenderAndCache"
SOAPAction: "Telerik.ReportService/IReportService/GetPage"

//Is this mean no error ? I got it for GetPage action
<a:Error i:nil="true" xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns:a="http://schemas.datacontract.org/2004/07/Telerik.Reporting.Service" />

no more Soap action traced for downloading images

Thanks in advance