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Session state provider for Azure AppFabric Cache with useBlobMode=false results in error "Key referred to does not exist"

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Problem

If you are using Session state provider (Windows Azure AppFabric) and configure useBlobMode=false, you might run into below error

ErrorCode<ERRCA0006>:SubStatus<ES0001>:Key referred to does not exist. Create objects based on a Key to fix the error.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: Microsoft.ApplicationServer.Caching.DataCacheException: ErrorCode<ERRCA0006>:SubStatus<ES0001>:Key referred to does not exist. Create objects based on a Key to fix the error.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

 

[DataCacheException: ErrorCode<ERRCA0006>:SubStatus<ES0001>:Key referred to does not exist. Create objects based on a Key to fix the error.]

   Microsoft.ApplicationServer.Caching.DataCache.ThrowException(ResponseBody respBody) +568

   Microsoft.ApplicationServer.Caching.DataCache.InternalPutAndUnlock(String key, Object value, DataCacheLockHandle lockHandle, TimeSpan timeout, DataCacheTag[] tags, String region, IMonitoringListener listener) +288

   Microsoft.ApplicationServer.Caching.<>c__DisplayClass8a.<PutAndUnlock>b__89() +149

   Microsoft.ApplicationServer.Caching.DataCache.PutAndUnlock(String key, Object value, DataCacheLockHandle lockHandle, TimeSpan timeout) +276

   Microsoft.Web.DistributedCache.<>c__DisplayClass19.<PutAndUnlock>b__18() +52

   Microsoft.Web.DistributedCache.<>c__DisplayClass2e`1.<PerformCacheOperation>b__2d() +19

   Microsoft.Web.DistributedCache.DataCacheRetryWrapper.PerformCacheOperation(Action action) +208

   Microsoft.Web.DistributedCache.DataCacheForwarderBase.PerformCacheOperation(Func`1 func) +167

   Microsoft.Web.DistributedCache.DataCacheForwarderBase.PutAndUnlock(String key, Object value, DataCacheLockHandle lockHandle, TimeSpan timeout) +162

   Microsoft.Web.DistributedCache.GranularSessionStoreProvider.SetAndReleaseItemExclusiveImpl(HttpContextBase context, String id, SessionStateStoreData item, Object lockId, Boolean newItem) +3925

   Microsoft.Web.DistributedCache.<>c__DisplayClass15.<SetAndReleaseItemExclusive>b__14() +47

   Microsoft.Web.DistributedCache.GranularSessionStoreProvider.ExecNonAbortable(Action a) +33

   System.Web.SessionState.SessionStateModule.OnReleaseState(Object source, EventArgs eventArgs) +929

   System.Web.SessionState.SessionStateModule.OnEndRequest(Object source, EventArgs eventArgs) +208

   System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +80

   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +266

 

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.225

 

Cause

In this case, below configuration is being used 

     <sessionState mode="Custom" customProvider="AppFabricCacheSessionStoreProvider">

      <providers>

        <add name="AppFabricCacheSessionStoreProvider"

             type="Microsoft.Web.DistributedCache.DistributedCacheSessionStateStoreProvider, Microsoft.Web.DistributedCache"

             cacheName="default"

             useBlobMode="false"

             dataCacheClientName="default" />

      </providers>

    </sessionState>

 

useBlobMode=false is not supported scenario for cloud. The reason this mode is not supported is because, as of today, there is no control over eviction policy when cache is hosted in Windows Azure platform.

Resolution

Consider using useBlobMode=true if you are using session state provider with Windows Azure Appfabric cache.

More Info

Current MSDN documentation does not explicitly call out this scenario and will be updated shortly.

Applies To

  • Windows Azure AppFabric Cache
  • Session State Provider (Azure)