Logical clock

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A logical clock is a mechanism for capturing chronological and causal relationships in a distributed system.

Logical clock algorithms of note are:

  • Lamport timestamps, which are monotonically increasing software counters.
  • Vector clocks, that allow for partial ordering of events in a distributed system.
  • Version vectors, order replicas, according to updates, in an optimistic replicated system.
  • Matrix clocks, an extension of vector clocks that also contains information about other processes' views of the system.