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HomeHomeUsing DNN Platf...Using DNN Platf...Administration ...Administration ...Intermittent Caching Error on Web FarmIntermittent Caching Error on Web Farm
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3/13/2008 7:27 AM
 
Marcus Wade

www.m2ws.com
Joined: 3/10/2005
Posts: 37

Hi,

I'm getting an intermittent problem in my Web Farmm enabled DNN 4.6.2 installation. It can occur in any part of the application .... Esentially the event view shows the following error/trace.

ModuleId: 439
ModuleDefId: 99
FriendlyName: Site Map
ModuleControlSource: DesktopModules/DNNMasters_SiteMap/SiteMap.ascx
AssemblyVersion: 04.06.02
PortalID: 3
PortalName: 
UserID: 1
UserName: host
ActiveTabID: 102
ActiveTabName: Site Map
RawURL: /FooterMenu/SiteMap/tabid/102/Default.aspx
AbsoluteURL: /Default.aspx
AbsoluteURLReferrer: http://www.obsrfundratings.co.uk/registered/Home/tabid/82/Default.aspx
UserAgent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X; en-us) AppleWebKit/523.15.1 (KHTML, like Gecko) Version/3.0.4 Safari/523.15
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: 22ca6117-02e6-4ba0-9398-995a5a89a2ff
InnerException: The process cannot access the file 'D:\WebFiles\Fundratings\Portals\_default\Cache\VGFiczM=.resources' because it is being used by another process.
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: System.IO.__Error.WinIOError
StackTrace:
Message: DotNetNuke.Services.Exceptions.ModuleLoadException: The process cannot access the file 'D:\WebFiles\Fundratings\Portals\_default\Cache\VGFiczM=.resources' because it is being used by another process. ---> System.IO.IOException: The process cannot access the file 'D:\WebFiles\Fundratings\Portals\_default\Cache\VGFiczM=.resources' 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) at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options) at System.IO.StreamWriter.CreateFile(String path, Boolean append) at System.IO.StreamWriter..ctor(String path, Boolean append, Encoding encoding, Int32 bufferSize) at System.IO.StreamWriter..ctor(String path, Boolean append) at System.IO.File.CreateText(String path) at DotNetNuke.Services.Cache.FileBasedCachingProvider.FBCachingProvider.CreateCacheFile(String FileName) at DotNetNuke.Services.Cache.FileBasedCachingProvider.FBCachingProvider.Insert(String CacheKey, Object objObject, CacheDependency objDependency, DateTime AbsoluteExpiration, TimeSpan SlidingExpiration, Boolean PersistAppRestart) at DotNetNuke.Common.Utilities.DataCache.SetCache(String CacheKey, Object objObject, TimeSpan SlidingExpiration, Boolean PersistAppRestart) at DotNetNuke.Entities.Tabs.TabController.GetTabsByPortal(Int32 PortalId) at DotNetNuke.Entities.Tabs.TabController.GetTabs(Int32 PortalId) at DNNMasters.SiteMap.SiteMap.addNode(SiteMapNodeCollection pNodes, TabInfo pTab, Int32 portalId) at DNNMasters.SiteMap.SiteMap.addNode(SiteMapNodeCollection pNodes, TabInfo pTab, Int32 portalId) at DNNMasters.SiteMap.SiteMap.BindData(Int32 portalId) at DNNMasters.SiteMap.SiteMap.setDataByPortal(Int32 portalId) at DNNMasters.SiteMap.SiteMap.Page_Load(Object sender, EventArgs e) --- End of inner exception stack trace ---

This appears be something to do with caching? It is running on clustered web farm environment with 4 web servers.

 Any help greatly appreciated!!
 
New Post
1/22/2009 1:22 PM
 
Edgard Concha

Joined: 9/14/2007
Posts: 2

Hello,
I hope you resolved the issue. If so, please share your experiences.

I had the same issue with my DNN web farm. Here are some tips you may want to give it a try. They have worked for me in most cases:

1) Use BroadcastPollingCachingProvider instead of FileBasedCachingProvider

The recommended setting for web farm is to use <caching defaultProvider="FileBasedCachingProvider">. However, I changed the following entry in web.config as follows: 

<caching defaultProvider="BroadcastPollingCachingProvider">

This change fixed most sites and they have been running several months with no complains

2) If the previous option doesn’t help, keep using FileBasedCachingProvider, but set DotNetNuke.Services.Cache.PurgeCache, in the scheduler, to run every 2 hours.


3) Give the site, its own application pool and set to recycle it more often.

Good luck!


 
 
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