| title Replication - Split Brain | |
| participant Client1 | |
| participant Instance1 | |
| participant Instance2 | |
| participant Client2 | |
| state over Client1, Client2, Instance1, Instance2: W0 | |
| state over Client1 : W0 -> W1 | |
| Client1 -> +Instance1: Push W1 | |
| Instance1 -> -Client1: Ack W1 | |
| state over Instance1 : W0 -> W1 | |
| state over Instance1 : Crash | |
| state over Client2 : W0 -> W2 | |
| Client2 -> +Instance2: Push W2 | |
| Instance2 -> -Client2 : Ack W2 | |
| state over Instance2 : W0 -> W2 | |
| state over Instance1: Restart | |
| par | |
| Instance2->Instance1: Replicate W2 | |
| Instance1->Instance2: Replicate W1 | |
| end | |
| parallel { | |
| state over Instance2: W0 -> W1 | |
| state over Instance1: W0 -> W2 | |
| state over Client1: W0 -> W1 | |
| state over Client2: W0 -> W2 | |
| } | |
| note over Instance1, Instance2 | |
| Instances status diverged | |
| and is even swapped from | |
| original | |
| end note |