| title Replication - Split Brain Detected |
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| participant Client1 |
| participant Instance1 |
| participant Global Ref-DB |
| participant Instance2 |
| participant Client2 |
| |
| state over Client1, Client2, Instance1, Instance2: W0 |
| state over Client1 : W0 -> W1 |
| Client1 -> +Instance1: Push W1 |
| Instance1 -> +Global Ref-DB: CAS if state == W0 set state W0 -> W1 |
| state over Global Ref-DB : W0 -> W1 |
| Global Ref-DB -> -Instance1 : ACK |
| state over Instance1 : W0 -> W1 |
| Instance1 -> -Client1: Ack W1 |
| |
| state over Instance1 : Crash |
| |
| state over Client2 : W0 -> W2 |
| Client2 -> +Instance2: Push W2 |
| |
| Instance2 -> +Global Ref-DB: CAS if state == W0 set state W0 -> W2 |
| Global Ref-DB -> -Instance2 : NACK |
| |
| Instance2 -> -Client2 : Push failed -- RO Mode |
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| state over Instance1: Restart |
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| Instance1->Instance2: Replicate W1 |
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| state over Instance2 : W0 -> W1 |
| |
| Client2 -> +Instance2: Pull W1 |
| Instance2 -> Client2 : Missing W1 |
| Client2 -> Instance2: Pull W1 |
| state over Client2 : W0 -> W1 -> W2 |
| Client2 -> Instance2: Push W2 |
| Instance2 -> +Global Ref-DB: CAS if state == W1 set state W1 -> W2 |
| state over Global Ref-DB: W0 -> W1 -> W2 |
| Global Ref-DB -> -Instance2 : ACK |
| state over Instance2: W0 -> W1 -> W2 |
| Instance2 -> -Client2 : ACK |
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