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> In addition, many applications within Google have switched to more database-like storage systems such as BigTable and Spanner.

And where do BigTable and Spanner store their data? ;)

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BigTable stores it's data in Colossus, but Colossus stores it's metadata in BigTable :)

And Colossus stores its metametametadata in Chubby :)

https://www.pdsw.org/pdsw-discs17/slides/PDSW-DISCS-Google-K...

Interestingly, Colossus was initially designed to be the next generation BigTable storage. It turned out that other teams had a similar problem, so it has become a more general file system.

Turns out that big table is also useful to implement the storage layer for big table itself. Luckily turtles can be stacked on top of each others

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