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FV-7: MVCC write skew detection

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- 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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dimgigov
2026-05-07 19:43:58 +03:00
parent 39e07b542d
commit 112ed4764d
5 changed files with 18 additions and 3 deletions
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formal-verification/README.md
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@@ -87,6 +87,7 @@ java -cp tla2tools.jar tlc2.TLC -config models/sharding.cfg sharding.tla
- `WriteWriteConflict` — no two committed transactions write the same key (first-committer-wins).
- `CommittedMustStart` — committed transactions have a valid start timestamp.
- `CommittedVersionsUnique` — no two committed versions for a key share the same txnId.
- `NoWriteSkew` — no two committed transactions have a circular read-write dependency.
### replication.tla
- `MonotonicLsn` (temporal) — the applied LSN never decreases.