We are having massive issues lately with one of our v8.17.0 Umbraco sites that run on Azure.

It crashes randomly then the logs start filling up with

{"@t":"2022-05-22T06:33:34.8055159Z","@mt":"An unhandled exception occurred","@l":"Error","@x":"System.IO.IOException: The process cannot access the file 'D:\\local\\Temp\\UmbracoData\\176c0ea91061639237a28ed82536be7d\\NuCache\\NuCache.Content.db' because it is being used by another process.\r\n   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)\r\n   at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)\r\n   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options)\r\n   at CSharpTest.Net.IO.TransactedCompoundFile..ctor(Options options)\r\n   at CSharpTest.Net.Storage.BTreeFileStoreV2..ctor(Options options)\r\n   at CSharpTest.Net.Collections.BPlusTree`2.OptionsV2.CreateStorage()\r\n   at CSharpTest.Net.Collections.BPlusTree`2.NodeCacheBase..ctor(BPlusTreeOptions`2 options)\r\n   at CSharpTest.Net.Collections.BPlusTree`2.NodeCacheNone..ctor(BPlusTreeOptions`2 options)\r\n   at CSharpTest.Net.Collections.BPlusTree`2..ctor(BPlusTreeOptions`2 ioptions)\r\n   at Umbraco.Web.PublishedCache.NuCache.DataSource.BTree.GetTree(String filepath, Boolean exists, ContentDataSerializer contentDataSerializer) in D:\\a\\1\\s\\src\\Umbraco.Web\\PublishedCache\\NuCache\\DataSource\\BTree.cs:line 32\r\n   at Umbraco.Web.PublishedCache.NuCache.PublishedSnapshotService.MainDomRegister() in D:\\a\\1\\s\\src\\Umbraco.Web\\PublishedCache\\NuCache\\PublishedSnapshotService.cs:line 169\r\n   at Umbraco.Core.Runtime.MainDom.Register(Action install, Action release, Int32 weight) in D:\\a\\1\\s\\src\\Umbraco.Core\\Runtime\\MainDom.cs:line 90\r\n   at Umbraco.Web.PublishedCache.NuCache.PublishedSnapshotService.<EnsureCaches>b__36_0() in D:\\a\\1\\s\\src\\Umbraco.Web\\PublishedCache\\NuCache\\PublishedSnapshotService.cs:line 230\r\n   at System.Threading.LazyInitializer.EnsureInitializedCore[T](T& target, Boolean& initialized, Object& syncLock, Func`1 valueFactory)\r\n   at Umbraco.Web.PublishedCache.NuCache.PublishedSnapshotService.EnsureCaches() in D:\\a\\1\\s\\src\\Umbraco.Web\\PublishedCache\\NuCache\\PublishedSnapshotService.cs:line 210\r\n   at Umbraco.Web.PublishedCache.NuCache.PublishedSnapshotService.CreatePublishedSnapshot(String previewToken) in D:\\a\\1\\s\\src\\Umbraco.Web\\PublishedCache\\NuCache\\PublishedSnapshotService.cs:line 1109\r\n   at System.Lazy`1.CreateValue()\r\n   at System.Lazy`1.LazyInitValue()\r\n   at Umbraco.Web.UmbracoInjectedModule.EnsureHasContent(UmbracoContext context, HttpContextBase httpContext) in D:\\a\\1\\s\\src\\Umbraco.Web\\UmbracoInjectedModule.cs:line 234\r\n   at Umbraco.Web.UmbracoInjectedModule.EnsureUmbracoRoutablePage(UmbracoContext context, HttpContextBase httpContext) in D:\\a\\1\\s\\src\\Umbraco.Web\\UmbracoInjectedModule.cs:line 172\r\n   at Umbraco.Web.UmbracoInjectedModule.ProcessRequest(HttpContextBase httpContext) in D:\\a\\1\\s\\src\\Umbraco.Web\\UmbracoInjectedModule.cs:line 111\r\n   at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()\r\n   at System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step)\r\n   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)","SourceContext":"Umbraco.Web.UmbracoApplicationBase","ProcessId":3308,"ProcessName":"w3wp","ThreadId":36,"AppDomainId":2,"AppDomainAppId":"LMW3SVC348075699ROOT","MachineName":"RD0003FF85B9F6","Log4NetLevel":"ERROR","HttpRequestNumber":13037,"HttpRequestId":"81e1ccbd-4518-4e5c-9748-df2bc049eab2"}

So as far as I can tell I've added all the appropriate config for Azure. i.e:

<add key="Umbraco.Core.MainDom.Lock" value="SqlMainDomLock" />
<add key="Umbraco.Core.LocalTempStorage" value="EnvironmentTemp" />
<add key="Umbraco.Examine.LuceneDirectoryFactory" value="Examine.LuceneEngine.Directories.SyncTempEnvDirectoryFactory, Examine" />

WEBSITE_DISABLE_OVERLAPPED_RECYCLING =1

This is a fairly large site (100K+ nodes). Has anyone experienced this before?

Thanks!