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FV-2: Raft leader step-down on partition loss

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- Add heartbeatReceived variable tracking last term with heartbeat
- Add Heartbeat action: leader sends keep-alive; recipient steps down on higher term
- Add HeartbeatTimeout: follower starts election if no heartbeat in current term
- Add LeaderLeaseExpired: leader steps down if it loses quorum connectivity
- Add LeaderHasSelfHeartbeat invariant: every leader must have valid heartbeat
- raft.tla now models realistic partition behavior (38M states verified)
- Update CHANGELOG -> v1.2.0, VERSION -> 1.2.0, PLAN.md, README.md
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dimgigov
2026-05-07 21:48:03 +03:00
parent 181e7d7019
commit 4791434cea
6 changed files with 97 additions and 11 deletions
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README.md
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@@ -55,7 +55,7 @@ with **TLA+** and the TLC model checker. All specs run with **weak fairness**
| Algorithm | Spec | States | Properties Verified |
|-----------|------|--------|---------------------|
| **Raft Consensus** | `formal-verification/raft.tla` | 3,031,684 | ElectionSafety, LeaderAppendOnly, StateMachineSafety, CommittedIndexValid, LogMatching |
| **Raft Consensus** | `formal-verification/raft.tla` | 38,051,647 | ElectionSafety, LeaderAppendOnly, StateMachineSafety, CommittedIndexValid, LogMatching, LeaderHasSelfHeartbeat |
| **Two-Phase Commit** | `formal-verification/twopc.tla` | 22,855,681 | Atomicity, NoOrphanBlocks, CoordinatorConsistency, NoDecideWithoutConsensus, ParticipantStateValid, RecoveryConsistency |
| **MVCC** | `formal-verification/mvcc.tla` | 177,721 | NoDirtyReads, ReadOwnWrites, WriteWriteConflict, CommittedMustStart, CommittedVersionsUnique, NoWriteSkew, **CommitProgress** (liveness) |
| **Replication** | `formal-verification/replication.tla` | 3,687,939 | AcksRemovePending, PendingAreKnown, AppliedLteCurrent, MonotonicLsn (temporal) |