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We've experienced a fairly hard-to-replicate-elsewhere issue with the xml map file. The site gets a good deal of traffic and also has a pretty large volume of pages/resources/resource combinations. The application is running on two web heads with shared file storage. Although it should be noted that the server admin couldn't find any correlation between traffic or server load and the symptoms described below.
The error message being thrown is as follows:
"The process cannot access the file '[app_path]\App_Data\ClientDependency[filemapname].xml' because it is being used by another process."
This is on a request to DependencyHandler.axd.
The general symptoms were described by the server admin as follows:
"The problem started to happen after CDF was enabled (edit: read as composite files enabled). There’s a direct correlation between site lock-ups and file sharing errors in event log. When sharing violation occurs, one application pool just stops responding until recycled."
I'll be investigating further and will update with any progress here, but would appreciate any thoughts/feedback.