The process cannot access the file NuCache.Content.db because it is being used by another process

PR: https://github.com/umbraco/Umbraco-CMS/pull/5924

Something is happening in Azure WebApps where the NuCache.Content.db file is locked causing the site to hang. I’ve attached the log file for reference.

The exception is as follows:

Umbraco.Core.Exceptions.BootFailedException: Boot failed: Umbraco cannot run. See Umbraco's log file for more details.

-> Umbraco.Core.Exceptions.BootFailedException: Boot failed.

-> System.IO.IOException: The process cannot access the file 'D:\home\site\wwwroot\App_Data\TEMP\NuCache\NuCache.Content.db' because it is being used by another process.
   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   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)
   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options)
   at CSharpTest.Net.IO.TransactedCompoundFile..ctor(Options options)
   at CSharpTest.Net.Storage.BTreeFileStoreV2..ctor(Options options)
   at CSharpTest.Net.Collections.BPlusTree`2.OptionsV2.CreateStorage()
   at CSharpTest.Net.Collections.BPlusTree`2.NodeCacheBase..ctor(BPlusTreeOptions`2 options)
   at CSharpTest.Net.Collections.BPlusTree`2.NodeCacheNormal..ctor(BPlusTreeOptions`2 options)
   at CSharpTest.Net.Collections.BPlusTree`2..ctor(BPlusTreeOptions`2 ioptions)
   at Umbraco.Web.PublishedCache.NuCache.DataSource.BTree.GetTree(String filepath, Boolean exists)
   at Umbraco.Web.PublishedCache.NuCache.PublishedSnapshotService..ctor(Options options, IMainDom mainDom, IRuntimeState runtime, ServiceContext serviceContext, IPublishedContentTypeFactory publishedContentTypeFactory, IdkMap idkMap, IPublishedSnapshotAccessor publishedSnapshotAccessor, IVariationContextAccessor variationContextAccessor, IUmbracoContextAccessor umbracoContextAccessor, ILogger logger, IScopeProvider scopeProvider, IDocumentRepository documentRepository, IMediaRepository mediaRepository, IMemberRepository memberRepository, IDefaultCultureAccessor defaultCultureAccessor, IDataSource dataSource, IGlobalSettings globalSettings, ISiteDomainHelper siteDomainHelper, IEntityXmlSerializer entitySerializer, IPublishedModelFactory publishedModelFactory, UrlSegmentProviderCollection urlSegmentProviders)

...

This is on Umbraco 8.0.1 which was upgraded from Umbraco 8.0.0. (attachment will need to be changed from .txt to.json)

UmbracoTraceLog.RD2818786B7D96.20190319.txt

[Shazwazza]

The same config principles apply to v8 as v7 for running on Azure. We defo need to get the docs updated (PRs are welcome!) The current azure docs are here https://our.umbraco.com/Documentation/Getting-Started/Setup/Server-Setup/azure-web-apps

for v8 you will need these in appSettings:

• <add key="Umbraco.Core.LocalTempStorage" value="EnvironmentTemp" />
• <add key="Umbraco.Examine.LuceneDirectoryFactory" value="Examine.LuceneEngine.Directories.SyncTempEnvDirectoryFactory, Examine" />
  • Alternatively depending on your requirements there is also Examine.LuceneEngine.Directories.TempEnvDirectoryFactory

[danielibanez]

I’m using 8.4.1 and just started getting this issue last night, 02/24/20. Will try upgrading and IgnoreLocalDb = true

Umbraco.Core.Exceptions.BootFailedException: Boot failed.

-> System.IO.IOException: The process cannot access the file D:\home\site\wwwroot\App_Data\TEMP\NuCache\NuCache.Content.db because it is being used by another process. at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)