Grokking the Advanced System Design Interview
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Database

Let's learn how Chubby uses a database for storage.

Initially, Chubby used a replicated version of Berkeley DB to store its data. Later, the Chubby team felt that using Berkeley DB exposes Chubby to more risks, so they decided to write a simplified custom database with the following characteristics:

  • Simple key/value database using write-ahead logging and snapshotting.
  • Atomic operations only and no general transaction support.
  • Database log is distributed among replicas using Paxos.

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