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1.  Filesystem path walking as implemented in the Linux VFS:

   1. http://lwn.net/Articles/419811/
   2. https://www.kernel.org/doc/Documentation/filesystems/path-lookup.txt

Optimizations available if a RESTful interface has exclusive access to the Datacatalog tables

We could maybe use potentially use commons-vfs and some aggressive caching in the web applications to reduce database load.

 http://commons.apache.org/proper/commons-vfs/