In this cases, assume we have 4-nodes cluster N1, N2, N3, and N4 and replication factor is 3. Client c1 sends W1 = [k1,V1] to N1 (a coordinator). A coordinator (N1) generates timestamp Mon 05-09-2015 11:30:40,200 (according to its local clock) and assigned it to W1 and sends the W1 to the N2, N3, and N4. After few seconds, Client c2 sends W2 = [K1, V2] to N4 (a coordinator). A coordinator (N4) generates timestamp Mon 05-09-2015 11:30:38,200 (according to its local clock, but assume here N4 clock a bit behind, nearly 2 seconds) and assigned IT to W2 and sends the W2 to N2, N3, and N4 (itself).
Assume we have write CL =ALL and read CL = ONE. Now, Client c2 wants to read K1, connects to a coordinator N1, a coordinator sends read K1 to N1, picking latest timestamp which is [K1, V1]:Mon 05-09-2015 11:30:40,200. So in this scenario, the latest data that wrote to the replicas is [K1, V2] which should be the correct one, but it reads [K1,V1] because of divert clock. Can such scenario occur? Thank you
