Google's Chubby Lock Service
Google has developed Chubby, a lock service for loosely-coupled distributed systems. It is designed for coarse-grained locking and also provides a limited but reliable distributed file system. Key parts of Google's infrastructure, including Google File System, BigTable, and MapReduce, use Chubby to synchronize accesses to shared resources. Though Chubby was designed as a lock service, it is now heavily used inside Google as a name server, supplanting DNS.
Read more about this topic: Distributed Lock Manager
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