re: Consistency models VIEW POST

re: Thank you very much for your quick reply. Each processor(or node) observes the same history of operations, maybe the client read the stale data fro...

U re welcome :)
what you described in your example cannot happen under sequential consistency.
The model is an abstract contract of the behaviour the system must respect at any point in time.
Coming back to your example you, just to make it a bit more concrete, we could:

  • use sessions for clients, so that reads and writes for the same client end up to the same processor
  • or use a leader processor which serializes reads and writes to other nodes. The idea is similar to what Raft and Paxos do.

Both these approaches will cause the clients to observe a system which behaves as sequential consistent.

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