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Google Chubby and the Paxos Algorithm

Nope, this is not the title of a children’s book (though it would be great as that!). Quote Google:
<<Chubby is a fault-tolerant system at Google that provides a distributed locking mechanism and stores small files. Typically there is one Chubby instance, or “cell”, per data center. Several Google systems – such as the Google Filesystem (GFS) and Bigtable – use Chubby for distributed coordination and to store a small amount of metadata.
Chubby achieves fault-tolerance through replication. A typical Chubby cell consists of five replicas, running the same code, each running on a dedicated machine. Every Chubby object (e.g., a Chubby lock, or file) is stored as an entry in a database. It is this database that is replicated. At any one time, one of these replicas is considered to be the “master”.
Chubby clients (such as GFS and Bigtable) contact a Chubby cell for service. The master replica serves all Chubby [...]

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