Hi,

I am having an issue running Umbraco in high availability on Azure. I have a single publisher BO instance and 2 subscriber instances. Occasionally I get an issue on one of the subscriber instances where it can not build the models after a publish from the publisher. See error below.

[ERR] Failed to build models.
System.IO.IOException: The process cannot access the file 'C:\home\site\wwwroot\umbraco\Data\TEMP\InMemoryAuto\Compiled\generated.cs0573c46626e368192efadf4dc6061363acea2c08.dll' because it is being used by another process.

We do dozens of publishes a day and we get this error from time to time, weeks apart.

The error indicates that multiple processes (possibly the 2 subscribers) are trying to access the file at the same time. I have configured the subscribers as specified in the Umbraco guide for Azure web apps, so it "shouldn't" be an issue. Guide here for reference - https://docs.umbraco.com/umbraco-cms/fundamentals/setup/server-setup/load-balancing/azure-web-apps to do the setup.

Here is a copy of the Config used on the subscriber.

 "CMS": {
            "Hosting": {
                "Debug": false,
                "LocalTempStorageLocation": "EnvironmentTemp"
            },
            "Global": {
                "Id": "xxx",
                "MainDomLock": "FileSystemMainDomLock",
                "UseHttps": true
            },
            "Examine": {
                "LuceneDirectoryFactory": "TempFileSystemDirectoryFactory"
            },
            "RuntimeMinification": {
                "UseInMemoryCache": false,
                "CacheBuster": "AppDomain"
            }
        },

I am at a loss as to why this is occurring. Does anyone have any insight that might help?

cheers...