Hi all,

I'm running DNN Community 5.1.4 in a hosted environment with a webfarm using the filebased caching provider.
All the DNN files exist on a central SAN and I have webfarm turned on in my configuration.  I regularly get "Process Cannot Access File: <some resource file>" because it is in use exception.  This seems to happen every time content changes for the module in question.  Any thoughts on how to resolve this issue?

I've seen some suggestions on clearing the caches, I've done this.  But, that only seems to address the issue for a short while.  The module in question is one that I wrote, it doesn't do anything 'funky', it's simply pulling a series of rows from the database.  I've tried setting the default cache time to -1 to turn off the caching, but that doesn't seem to help.  One more note, is seems that I'll get this same error if I make changes to an HTML block that' on a page too, so I don't think it's my module (but I'm not ready to rule it out either).

Are these exceptions just part of the 'normal operation' of the filebased provider?  When I used the broadcast polling provider, we never had these issues (because there were no shared files).  I had to stop using that provider for a number of reasons.

Thank you in advance for any thoughts / help

The exception:
AssemblyVersion: 5.1.4
PortalID: 2
PortalName: xyzzy
UserID: -1
UserName:
ActiveTabID: 75
ActiveTabName: Home
RawURL: /DesktopModules/myModule/myApp
AbsoluteURL: /DesktopModules/MyModule/MyApp
AbsoluteURLReferrer: http://mySite/TruckView/tabid/495/Default.aspx
UserAgent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; HPNTDF)
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: 0bc6c1a5-b3f3-415c-81a3-98db266017c5
InnerException: The process cannot access the file '\\<SAN_PATH>\Portals\_default\Cache\72240F51792D2D59299D7CC816A992AB.resources' because it is being used by another process.
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: System.IO.__Error.WinIOError
StackTrace:
Message: System.IO.IOException: The process cannot access the file '\\<SAN_PATH>\Portals\_default\Cache\72240F51792D2D59299D7CC816A992AB.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, String CacheKey)
Source:
Server Name: 264177-WEB

Good info, I checked with my provider.  They do have a scanner that makes passes, scanning is not done on a per write basis.  This behavior seems to be too consistent for this to be the issue.  They do have a media accellerator, apparently I can exclude pages from that if I like.

Some more thoughts, I was running disk based caching and I changed it to memory based.  This cleared up all but one item.

I have a set of web services that are called on a regular basis  (like once every 10 seconds / client) from client side javascript.   I'm not sure whey it's doing any caching at all (is there a way I can turn it off?).  The webservices are fairly straight forward, based on the input, instantiate a controller, use the controller to fetch some rows from the database, massage the rows a little bit, return the rows.

Is there some nuance to the interaction of webservcies and DNN that I need to account for? Or would you suspect the media accelerator?

Thanks!!