 dimgigov
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f9e5169c3d
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FV-6: Liveness properties + fairness constraints
- mvcc.tla: Add CommitProgress liveness (verified with WF_vars)
- raft/twopc/mvcc/gossip: Add Spec definitions with WF_vars(Next)
- gossip.tla: Fix LearnViaGossip strength-based filtering
(prevents overwriting Dead/Suspect with weaker state)
- twopc.tla: Add DecideCommitAction/DecideAbortAction for SF fairness
- Update all .cfg files to use SPECIFICATION Spec
- Update CHANGELOG.md -> v1.1.0, VERSION -> 1.1.0, PLAN.md
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2026-05-07 21:21:22 +03:00 |
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dimgigov
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112ed4764d
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FV-7: MVCC write skew detection
- mvcc.tla: Add NoWriteSkew invariant
- mvcc.tla: CommitTxn checks for circular read-write dependencies
- models/mvcc.cfg: Add NoWriteSkew to checked invariants
- Update PLAN.md, ANALYSIS.md, README.md
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2026-05-07 19:43:58 +03:00 |
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dimgigov
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19d0ff7366
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feat(verify): expand formal verification to 7 specs, add versioning, CI integration
Added 3 new TLA+ specs:
- gossip.tla — SWIM gossip membership & failure detection
- deadlock.tla — wait-for graph deadlock detection
- sharding.tla — consistent hashing shard assignment
Improved existing 4 specs:
- raft.tla: added CommittedIndexValid invariant
- twopc.tla: added CoordinatorConsistency, NoDecideWithoutConsensus,
ParticipantStateValid; increased to MaxTxnId=3
- mvcc.tla: added CommittedMustStart, CommittedVersionsUnique
- replication.tla: added AppliedLteCurrent, SemiSyncQuorum
Infrastructure:
- VERSION file (1.0.0)
- CHANGELOG.md
- ANALYSIS.md (weak spots & improvement plan)
- run_all.sh script for batch TLC verification
- CI verify job in GitHub Actions
- Updated README with new specs and properties
Total: 7 specs, 26 invariants, 11.6M states checked, 0 errors
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2026-05-07 18:26:55 +03:00 |
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dimgigov
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e73bfb450c
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feat: formal verification suite — TLA+ specs for Raft, 2PC, MVCC, Replication
Verified with TLC model checker:
- Raft: 475k states, ElectionSafety + StateMachineSafety
- 2PC: 22k states, Atomicity + NoOrphanBlocks
- MVCC: 177k states, NoDirtyReads + ReadOwnWrites + WriteWriteConflict
- Replication: 3.6M states, MonotonicLsn + AcksRemovePending
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2026-05-07 15:57:33 +03:00 |
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