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FINAL: flexible and scalable composition of file system name spaces

Group file operations enable tools and middleware to operate upon a large group of files located across thousands of independent servers in a scalable fashion, a necessary requirement for effective use of today's largest distributed systems. Our initial prototype of group file operations showed scalability benefits for several tools, but also revealed the importance of having a scalable method for defining useful groups. We have developed a language called FINAL for describing name space composition in a flexible and scalable manner. Clients of our TBON-FS distributed file system can use this language to compose a single-system image (SSI) name space that automatically creates useful groups in a scalable fashion. We provide many examples of traditional and SSI name space compositions that can be described using FINAL, and report how TBON-FS can compose a global name space from tens of thousands of independent name spaces in one-quarter second.