We have a web application which uses Microsoft.Web.Redis.RedisSessionStateProvider as the session state provider. We've had no problems with this until recently when suddenly the application is reporting a large number of exceptions as detailed below.The message suggests some kind of timeout. But I've no idea how to resolve this. The application is an instance of Kentico CMS and we haven't customised its session caching mechanism in any way.Main exception:Message:
Exception of type 'System.Web.HttpException' was thrown.Stack Trace: at System.Web.HttpAsyncResult.End()
at System.Web.HttpApplication.AsyncEventExecutionStep.OnAsyncEventCompletion(IAsyncResult ar)
Inner exception:Message:
Timeout performing EVAL, inst: 1, mgr: Inactive, err: never, queue: 0, qu: 0, qs: 0, qc: 0, wr: 0, wq: 0, in: 0, ar: 0, IOCP: (Busy=0,Free=1000,Min=2,Max=1000), WORKER: (Busy=3,Free=32764,Min=2,Max=32767), clientName: KSCOMAZUATWEB2Stack Trace: at StackExchange.Redis.ConnectionMultiplexer.ExecuteSyncImpl[T](Message message, ResultProcessor`1 processor, ServerEndPoint server) in c:\TeamCity\buildAgent\work\3ae0647004edff78\StackExchange.Redis\StackExchange\Redis\ConnectionMultiplexer.cs:line 1927
at StackExchange.Redis.RedisBase.ExecuteSync[T](Message message, ResultProcessor`1 processor, ServerEndPoint server) in c:\TeamCity\buildAgent\work\3ae0647004edff78\StackExchange.Redis\StackExchange\Redis\RedisBase.cs:line 80
at StackExchange.Redis.RedisDatabase.ScriptEvaluate(String script, RedisKey[] keys, RedisValue[] values, CommandFlags flags) in c:\TeamCity\buildAgent\work\3ae0647004edff78\StackExchange.Redis\StackExchange\Redis\RedisDatabase.cs:line 866
at Microsoft.Web.Redis.StackExchangeClientConnection.@@c__DisplayClass4.@Eval@b__3() in d:\TeamCityBuildAgent\work\f55792526e6d9089\src\Shared\StackExchangeClientConnection.cs:line 113
at Microsoft.Web.Redis.StackExchangeClientConnection.RetryForScriptNotFound(Func`1 redisOperation) in d:\TeamCityBuildAgent\work\f55792526e6d9089\src\Shared\StackExchangeClientConnection.cs:line 129
at Microsoft.Web.Redis.StackExchangeClientConnection.RetryLogic(Func`1 redisOperation) in d:\TeamCityBuildAgent\work\f55792526e6d9089\src\Shared\StackExchangeClientConnection.cs:line 155
at Microsoft.Web.Redis.StackExchangeClientConnection.Eval(String script, String[] keyArgs, Object[] valueArgs) in d:\TeamCityBuildAgent\work\f55792526e6d9089\src\Shared\StackExchangeClientConnection.cs:line 113
at Microsoft.Web.Redis.RedisConnectionWrapper.TryTakeWriteLockAndGetData(DateTime lockTime, Int32 lockTimeout, Object@ lockId, ISessionStateItemCollection@ data, Int32@ sessionTimeout) in d:\TeamCityBuildAgent\work\f55792526e6d9089\src\RedisSessionStateProvider\RedisConnectionWrapper.cs:line 182
at Microsoft.Web.Redis.RedisSessionStateProvider.GetItemFromSessionStore(Boolean isWriteLockRequired, HttpContext context, String id, Boolean@ locked, TimeSpan@ lockAge, Object@ lockId, SessionStateActions@ actions) in d:\TeamCityBuildAgent\work\f55792526e6d9089\src\RedisSessionStateProvider\RedisSessionStateProvider.cs:line 272
at Microsoft.Web.Redis.RedisSessionStateProvider.GetItemExclusive(HttpContext context, String id, Boolean@ locked, TimeSpan@ lockAge, Object@ lockId, SessionStateActions@ actions) in d:\TeamCityBuildAgent\work\f55792526e6d9089\src\RedisSessionStateProvider\RedisSessionStateProvider.cs:line 190
at System.Web.SessionState.SessionStateModule.GetSessionStateItem()
at System.Web.SessionState.SessionStateModule.PollLockedSessionCallback(Object state)
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