Safety and Liveness Properties
In order to guarantee safety, Paxos defines three safety properties and ensures they are always held, regardless of the pattern of failures:
- Non-triviality
- Only proposed values can be learned.
- Consistency
- At most one value can be learned (i.e., two different learners cannot learn different values).
- Liveness(C;L)
- If value C has been proposed, then eventually learner L will learn some value (if sufficient processors remain non-faulty).
Read more about this topic: Paxos (computer Science)
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