| 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 |
