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ASP.NET Output Cache Provider Configuration Settings (Azure Cache)

Updated: July 17, 2010

noteNote
For guidance on choosing the right Azure Cache offering for your application, see Which Azure Cache offering is right for me?.

This topic covers the configuration settings for the output cache provider for ASP.NET. These settings are specified in the providers section of the outputCache element in the web.config file.

Output Cache Configuration Settings

 

Attribute Description

name (required)

The “friendly” name of the provider used by the outputCache element to reference the provider.

type (required)

The .NET Framework type string for the provider. See the note below on the required value.

cacheName (required)

The name of the cache. This must be set to “default”.

dataCacheClientName (optional)

The name of the dataCacheClient section to use from the dataCacheClients configuration section. This attribute is only required if multiple dataCacheClient sections are specified in the web.config file. By default, the provider will use the dataCacheClient section named “default”.

applicationName (optional)

A string value used by the provider when creating cache keys for storing output cache data. The default is an empty string. When this attribute is not set the provider uses the value of HttpRuntime.AppDomainAppId as part of the cache keys it uses internally. Unlike the session state feature, you do not want to share output cache data across different ASP.NET applications (for example, /contoso and /AdventureWorks cannot share output cache data). Instead ensure that different physical instances of the same application all have access to the same output cache data. There are two different ways to accomplish this:

  • If the applicationName provider attribute is not explicitly set, then HttpRuntime.AppDomainAppId is used internally by the provider when constructing cache keys. This means each physical instance of the same application (i.e. each web server hosting the /contoso application) needs to be installed in IIS with the exact same metabase path. See http://support.microsoft.com/kb/325056for an explanation of how metabase paths are used with the SQL Server and out-of-process session state providers. Although session state is a different feature, the same issue exists with keeping metabase paths in sync. This applies to output caching when the applicationName attribute has not been set in the web.config file.

  • An easier approach is for each instance of the same ASP.NET application (for example, on each web server hosting the /contoso application) to use the same applicationName attribute in the web.config file. This allows different physical instances of the same application to read and write the same output cache data. In this case the provider does not use AppDomainAppId when constructing cache keys and hence there is no risk of mismatched metabase paths.

retryInterval (optional)

A timespan for the length of time to wait between retry attempts if an error occurs when communicating with the cache. The string format to use for this value is "HH:MM:SS". By default the provider will sleep for one second.

retryCount (optional)

An integer value that tells the provider the number of retry attempts in the event of a communications failure with the cache. Note that not all operations are able to be retried. The default value is three retry attempts. The provider sleeps for the configured retryInterval time between each retry attempt.

noteNote
The type attribute should be set to “Microsoft.Web.DistributedCache.DistributedCacheOutputCacheProvider, Microsoft.Web.DistributedCache”.

Example

<configuration>
  <configSections>
    <section name="dataCacheClients" 
          type="Microsoft.ApplicationServer.Caching.DataCacheClientsSection, Microsoft.ApplicationServer.Caching.Core"
          allowLocation="true" allowDefinition="Everywhere" />
    <section name="cacheDiagnostics"
          type="Microsoft.ApplicationServer.Caching.AzureCommon.DiagnosticsConfigurationSection, Microsoft.ApplicationServer.Caching.AzureCommon"
          allowLocation="true" allowDefinition="Everywhere" />
  </configSections>
  <system.web>
    <!-- Azure Caching output caching provider -->
    <caching>
      <outputCache defaultProvider="AFCacheOutputCacheProvider">
        <providers>
          <add name="AFCacheOutputCacheProvider" 
            type="Microsoft.Web.DistributedCache.DistributedCacheOutputCacheProvider, Microsoft.Web.DistributedCache" 
            cacheName="default" 
            dataCacheClientName="default" 
            applicationName="AFCacheOutputCache" />
        </providers>
      </outputCache>
    </caching>
  </system.web>
  <dataCacheClients>
    <dataCacheClient name="default">
      <autoDiscover isEnabled="true" identifier="CacheWorkerRole1" />
    </dataCacheClient>
  </dataCacheClients>
  <cacheDiagnostics>
    <crashDump dumpLevel="Off" dumpStorageQuotaInMB="100" />
  </cacheDiagnostics>
</configuration>

See Also

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