Hi,

We're using Umbraco 8.6.4 and we've just experienced an issue where by the backoffice perfomance dropped dramatically.

After reviewer Application Insights on Azure and the Umrbaco Logs, the following errors occured:-

System.ObjectDisposedException at Examine.LuceneEngine.Providers.LuceneIndex.SafelyProcessQueueItems

AND

Lucene.Net.Store.AlreadyClosedException at Lucene.Net.Index.IndexReader.EnsureOpen

System.AggregateException: at Umbraco.Core.Scoping.ScopeContext.ScopeExit (Umbraco.Core, Version=8.0.0.0, Culture=neutral, PublicKeyToken=nullUmbraco.Core, Version=8.0.0.0, Culture=neutral, PublicKeyToken=null: D:\a\1\s\src\Umbraco.Core\Scoping\ScopeContext.csUmbraco.Core, Version=8.0.0.0, Culture=neutral, PublicKeyToken=null: 38) at Umbraco.Core.Scoping.Scope+<>cDisplayClass710.2 (Umbraco.Core, Version=8.0.0.0, Culture=neutral, PublicKeyToken=nullUmbraco.Core, Version=8.0.0.0, Culture=neutral, PublicKeyToken=null: D:\a\1\s\src\Umbraco.Core\Scoping\Scope.csUmbraco.Core, Version=8.0.0.0, Culture=neutral, PublicKeyToken=null: 437) at Umbraco.Core.Scoping.Scope.TryFinally (Umbraco.Core, Version=8.0.0.0, Culture=neutral, PublicKeyToken=nullUmbraco.Core, Version=8.0.0.0, Culture=neutral, PublicKeyToken=null: D:\a\1\s\src\Umbraco.Core\Scoping\Scope.csUmbraco.Core, Version=8.0.0.0, Culture=neutral, PublicKeyToken=null: 472) at Umbraco.Core.Scoping.Scope.TryFinally (Umbraco.Core, Version=8.0.0.0, Culture=neutral, PublicKeyToken=nullUmbraco.Core, Version=8.0.0.0, Culture=neutral, PublicKeyToken=null: D:\a\1\s\src\Umbraco.Core\Scoping\Scope.csUmbraco.Core, Version=8.0.0.0, Culture=neutral, PublicKeyToken=null: 477) at Umbraco.Core.Scoping.Scope.TryFinally (Umbraco.Core, Version=8.0.0.0, Culture=neutral, PublicKeyToken=nullUmbraco.Core, Version=8.0.0.0, Culture=neutral, PublicKeyToken=null: D:\a\1\s\src\Umbraco.Core\Scoping\Scope.csUmbraco.Core, Version=8.0.0.0, Culture=neutral, PublicKeyToken=null: 477) at Umbraco.Core.Scoping.Scope.RobustExit (Umbraco.Core, Version=8.0.0.0, Culture=neutral, PublicKeyToken=nullUmbraco.Core, Version=8.0.0.0, Culture=neutral, PublicKeyToken=null: D:\a\1\s\src\Umbraco.Core\Scoping\Scope.csUmbraco.Core, Version=8.0.0.0, Culture=neutral, PublicKeyToken=null: 460) at Umbraco.Core.Scoping.Scope.Dispose (Umbraco.Core, Version=8.0.0.0, Culture=neutral, PublicKeyToken=nullUmbraco.Core, Version=8.0.0.0, Culture=neutral, PublicKeyToken=null: D:\a\1\s\src\Umbraco.Core\Scoping\Scope.csUmbraco.Core, Version=8.0.0.0, Culture=neutral, PublicKeyToken=null: 365) at Umbraco.Core.Services.Implement.ContentService.Save (Umbraco.Core, Version=8.0.0.0, Culture=neutral, PublicKeyToken=nullUmbraco.Core, Version=8.0.0.0, Culture=neutral, PublicKeyToken=null: D:\a\1\s\src\Umbraco.Core\Services\Implement\ContentService.csUmbraco.Core, Version=8.0.0.0, Culture=neutral, PublicKeyToken=null: 811) at Umbraco.Web.Editors.ContentController.SaveAndNotify (Umbraco.Web, Version=8.0.0.0, Culture=neutral, PublicKeyToken=nullUmbraco.Web, Version=8.0.0.0, Culture=neutral, PublicKeyToken=null: D:\a\1\s\src\Umbraco.Web\Editors\ContentController.csUmbraco.Web, Version=8.0.0.0, Culture=neutral, PublicKeyToken=null: 893) at Umbraco.Web.Editors.ContentController.PostSaveInternal (Umbraco.Web, Version=8.0.0.0, Culture=neutral, PublicKeyToken=nullUmbraco.Web, Version=8.0.0.0, Culture=neutral, PublicKeyToken=null: D:\a\1\s\src\Umbraco.Web\Editors\ContentController.csUmbraco.Web, Version=8.0.0.0, Culture=neutral, PublicKeyToken=null: 688) at lambdamethod (Anonymously Hosted DynamicMethods Assembly, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null) at System.Web.Http.Controllers.ReflectedHttpActionDescriptor+ActionExecutor+<>cDisplayClass62.2 (System.Web.Http, Version=5.2.7.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35) at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ExecuteAsync (System.Web.Http, Version=5.2.7.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35) at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089) at System.Web.Http.Controllers.ApiControllerActionInvoker+

Our back-office site is separate from the frontend, but has anyone else experienced such errors? We had to restart the App Service to get it working again, but it would be good to know what could have caused this as I fear this might happen again.

Thanks