We are using Sitecore 9.0.2 deployed in PAAS and CD app service is showing below error and logs are full of this kind of exceptions:
ERROR ProcessExpiredItems => System.TimeoutException: Timeout performing EVAL, inst: 0, mgr: Inactive, err: never, queue: 3933, qu: 3933, 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=50,Max=32767), clientName: RD0004FFDF4447at StackExchange.Redis.ConnectionMultiplexer.ExecuteSyncImpl[T](Message message, ResultProcessor`1 processor, ServerEndPoint server)at
StackExchange.Redis.RedisBase.ExecuteSync[T](Message message, ResultProcessor
1 processor, ServerEndPoint server)at StackExchange.Redis.RedisDatabase.ScriptEvaluate(String script, RedisKey[] keys, RedisValue[] values, CommandFlags flags)at Sitecore.SessionProvider.Redis.StackExchangeClientConnection.<>c__DisplayClass12_0.<Eval>b__0()at Sitecore.SessionProvider.Redis.StackExchangeClientConnection.RetryForScriptNotFound(Func
1 redisOperation)at Sitecore.SessionProvider.Redis.StackExchangeClientConnection.RetryLogic(Func`1 redisOperation)at Sitecore.SessionProvider.Redis.StackExchangeClientConnection.Eval(String script, String[] keyArgs, Object[] valueArgs)at Sitecore.SessionProvider.Redis.RedisExpirationIndexWrapper.GetSessionFromExpirationIndex(DateTime signalTime, DateTime processExpirationTime)at Sitecore.SessionProvider.Redis.RedisConnectionWrapper.d__27.MoveNext()atSitecore.SessionProvider.Redis.RedisSessionStateProvider.OnProcessExpiredItems(DateTime signalTime)2019-03-28T13:43:08
What I want to understand is that meaning of queue: being very high i.e 3933 more than max number what does this means?