Create multiple subdirectories to improve performance

Current code makes sense to spread files amongst multiple directories.
Imho it's too complicated wrt the 2-level iterator (use basename instead) and ensureCacheFolderExists (which can be done when writing).

It does not yet address the main issue topic, limiting number of files.

could an error_log message be thrown and not an exception.
i have several instances where it is thrown but on refresh the subdirectory is created.
so maybe have it logged and treat it as a cache miss instead.

Rerolled patch to throw an error not and exception when a directory cannot be created.

I agree with @geek-martin. This should be renamed to "Create multiple subdirectories to improve performance". It is not about limiting files.

The last submitted patch, 10: 3001324-create-multiple-subfolders.patch, failed testing. View results →

Changed the name to: Create multiple subdirectories to improve performance
since it does not limit the number of cache files.

The patches and MR are related to that.

rerolled for filecache 1.1
changed throw exception to error_log
Use case:
There seem to be race conditions or "phantom errors" that appear. I do not want the site to crash. Instead log the error.

The last submitted patch, 14: 3001324-11-create-multiple-subfolders-log-errors-14.patch, failed testing. View results →