1b5bcbacd7
A client-side ship DEADLINE means the RPC did not round-trip within
request_timeout — which a slow-but-ALIVE follower produces under a sustained
1536-D ack=quorum apply burst (transport runtime momentarily starved by the
CPU-heavy HNSW apply on its single segment-receiver thread) exactly as a
genuinely blackholed peer does. Counting that as record_failure was the
write-burst false-partition: 5 such opened both followers' breakers, the commit
index stalled, ack=quorum 503'd, and retries re-burst the same starved peers
with no self-heal.
- CircuitBreaker::record_timeout: opens ONLY when the peer shows no recent proof
of life (no round-tripped success/backpressure within reset_duration); neutral
no-op when liveness is fresh; re-opens (never wedges) HalfOpen; never refreshes
the liveness stamp (no reply arrived).
- PeerPool::send_to routes tonic DeadlineExceeded/Cancelled -> record_timeout;
genuine severance still surfaces as connect-level Unavailable/transport reset
-> record_failure and still opens the breaker.
- ship_timeout_breaker.rs: end-to-end proof over a REAL tonic WalShipping server
(handler succeeds once then hangs past the client deadline) + 6 unit tests.
Also: re-scope G-S Scalability guarantee to read-throughput with the Ref-A
tidal-t5-readtput owner-test (write 2.5x is structurally impossible on 3-node
full-placement RF3); bump k8s image to m12-rc6 (live, commit 0919b0a); rustfmt
soak_eval / soak-eval / s3 / tidalctl.
78 lines
8.7 KiB
Markdown
78 lines
8.7 KiB
Markdown
# Enterprise-Guarantee → Automated-Test Traceability (m11p9)
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This is the m11p9 exit-gate artifact: **every guarantee in
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[roadmap-to-cluster.md §2](../../roadmap-to-cluster.md) maps to a named automated
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test** (the second half of the GA bar is the calendar one — the nightly suite
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green for 30 consecutive days; see [phase-9.md](phase-9.md)).
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Each guarantee lists the named test(s) that prove it, the fault class each one
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injects (where applicable), and the first-class invariant checker
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([`tidal-server/tests/support/invariants.rs`](../../../tidal-server/tests/support/invariants.rs))
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it asserts through. All `mp_*` tests are tier-3 over REAL OS processes
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(`MultiProcCluster`); partitions sever real loopback TCP; the disk-full /
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slow-fsync faults return a real `ENOSPC` / sleep the real fsync behind the
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`fault-injection` feature (`tidal/src/fault.rs`).
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Run any suite locally:
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`cargo test -p tidal-server --features "cluster-e2e fault-injection" --test <suite> -- --test-threads 1 --nocapture`.
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Every named test that EXISTS below runs nightly via the cron pipeline in
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[`.woodpecker.yaml`](../../../.woodpecker.yaml): the chaos/correctness suites and
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the gated soak in `nightly-chaos`/`nightly-soak`, and the G-Sec/G-Op owner-tests
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(mTLS, `cluster_security`, `tidalctl` backup/restore, WAL-archival) in
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`nightly-security-ops`. The one exception is the **G-S** throughput gate, which
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is not yet written (m11p6 L4) — its row is marked accordingly.
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| Guarantee | Named automated test(s) | Suite | Fault / scenario | Invariant checker |
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|---|---|---|---|---|
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| **G-D Durability** — `ack=quorum` 2xx ⇒ majority-durable; SIGKILL any node ⇒ zero acked loss | `mp_quorum_ledger_zero_acked_loss_across_killpoints` | `cluster_quorum` | SIGKILL leader across N random kill-points under quorum load | `AckLedger` (frontier + content) |
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| | `mp_auto_failover_writes_resume_zero_acked_loss` | `cluster_election` | SIGKILL leader, auto-elect, across kill-points | `AckLedger` |
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| | `mp_disk_full_follower_degrades_no_acked_loss` | `cluster_faults` | **disk-full** (ENOSPC) on a follower | `AckLedger` + `MonotonicCounters` |
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| | `mp_slow_fsync_follower_lags_but_quorum_holds`, `mp_slow_fsync_both_followers_force_honest_quorum_timeout` | `cluster_faults` | **slow-fsync** on one / both followers | `AckLedger` |
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| | `mp_follower_reseeds_via_snapshot_after_compaction`, `mp_quarantined_node_reseeds_without_wipe` | `cluster_reseed` | WAL compaction past cursor / divergent-suffix quarantine | content probes |
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| **G-A Availability** — single-node loss ⇒ reads continue, writes resume <10 s, no dual-leader | `mp_auto_failover_writes_resume_zero_acked_loss` | `cluster_election` | leader SIGKILL → election (<10 s) | `AckLedger` |
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| | `mp_fenced_ex_leader_restart_cannot_write` | `cluster_election` | partition leader away, restart while fenced | fencing assertions |
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| | `mp_flapping_links_bounded_churn` | `cluster_election` | repeated link flaps | single-leader-per-term |
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| | `mp_asymmetric_partition_no_split_brain_no_loss` | `cluster_faults` | **asymmetric partition** (inbound severed, outbound up) | `assert_single_leader_per_term` + `AckLedger` |
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| | `mp_self_heal_converges_without_operator_verb` | `cluster_chaos` | gRPC link sever, no operator verb | feed parity |
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| **G-S Scalability** _(re-scoped 2026-06-19 — read-throughput)_ — read throughput scales with node count at RF=3 **full placement**: every node serves `/vector_search` from its LOCAL replica (no cross-node read forward), so aggregate read-tput ≈ N × single-node within the 10 ms p99 / recall ≥ 0.95 SLA. _Write-tput 2.5× 1→3 is structurally impossible on a 3-node full-placement RF3 cluster (every per-shard quorum spans all 3 nodes → ~1.0× write-scaling), proven in `docs/profiling/m12p4-t5-sharded-throughput.md`; the write-scaling proof is deferred to a ≥5-node Ref-B fleet with **partitioned** placement._ | `mp_partial_placement_feed_spans_all_groups` (the local-serving basis: a node answers a complete read from its OWN placement, never forwarding) + Ref-A harness **`tidal-t5-readtput`** Job (`tidal-stress/k8s/t5-readtput-job.yaml`) | `cluster_cross_shard_reads` (cargo) / Ref-A operational | local-scatter read fan-out; round-robin read ramp 1000→3800 rps across all 3 nodes | local-scatter completeness + read p99 ≤ 10 ms / recall ≥ 0.95 SLA gates |
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| **G-E Elasticity** — online add/remove/replace; snapshot+stream catch-up; p99 <2× for <60 s | `mp_scale_3_5_3_under_load_zero_loss`, `mp_seed_join_snapshot_catchup`, `mp_dns_hostname_topology_replicates` | `cluster_membership` | scale 3→5→3 under load; seed-join after compaction | `AckLedger` (lost=0), p99 bound |
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| **G-Sec Security** — all inter-node links mTLS; authenticated RPC; rotation no downtime; admin audit | `http_tls_serves_ca_trusting_client_and_rejects_foreign`, `http_tls_cert_rotation_under_load_drops_zero` | `cluster_security` | foreign-CA client rejected; cert hot-rotation under load | zero-drop assertion |
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| | `mtls` (foreign-pod ship rejected), `cluster::security` unit tests (token mint/verify, marker-not-bypass) | `tidal-net/tests/mtls.rs`, engine unit | foreign pod cannot ship or call internal routes | negative tests |
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| **G-O Observability** — per-node Prometheus metrics; dashboard answers golden signals; alerts on lag / commit stall / election churn | per-node `/metrics` listener + `tidaldb_cluster_*` set (m11p8); `grafana-dashboard.json` "Cluster Replication" row (12 panels); `prometheus-alerts.yaml` `tidaldb-cluster` group (8 rules) | `cluster_runbook` (`runbook_s5_health_and_openapi`) + artifacts | metric/alert presence | artifact + status tests |
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| **G-Op Operability** — rolling upgrade N/N+1 under load (CI gate); backup/restore + PITR drilled; runbooks executable | `mp_rolling_upgrade_no_loss_no_stall` (the **Woodpecker release gate**) | `cluster_lifecycle` | graceful SIGTERM → version-tagged restart → heal → fixpoint under load | `AckLedger` |
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| | `backup_then_restore_roundtrips`, `restore_rejects_corrupted_backup`, `online_compaction_archives_before_deleting` | `tidalctl` / engine | offline backup/restore integrity; gap-free WAL archival (PITR) | BLAKE3 manifest |
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| | `runbook_s5..s11` (full operator playbook) | `cluster_runbook` | failover / partition / shutdown+recovery drills | per-drill |
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| **G-C Continuous correctness** — nightly chaos + soak green 30 consecutive days | the entire `cluster_faults` suite + the `nightly-chaos`/`nightly-soak` cron pipeline + `tidal-stress` soak regression gates + THIS matrix | `cluster_faults` / `.woodpecker.yaml` / `tidal-stress` | all fault classes nightly; soak p99/error regression gates | all four checkers |
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## Honest status of the bar
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- **G-D, G-A, G-E, G-Sec, G-Op** — each maps to a green named test that runs in
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the nightly pipeline. ✅
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- **G-S (Scalability)** — **RE-SCOPED 2026-06-19 to read-throughput** and now
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owner-tested. The original write-throughput bar (≥2.5× 1→3 at RF=3) is
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*structurally* unachievable on the live 3-node full-placement cluster: every
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shard's quorum spans all three nodes, so every follower applies every write and
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adding a node adds no write capacity (~1.0×, measured in
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`docs/profiling/m12p4-t5-sharded-throughput.md`). The honest, provable
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scalability property on full placement is READ-throughput: every node serves
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`/vector_search` from its local replica, so capacity scales ~linearly with node
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count. Owner-test = the structural cargo e2e `mp_partial_placement_feed_spans_all_groups`
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(local-serving, no cross-node forward) + the Ref-A `tidal-t5-readtput` harness.
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Measured (rc12, cluster-spread across all 3 nodes): p99 7.97/11.47/9.48/9.28 ms @
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100/200/300/500 rps, recall@10 0.9989, 0.00% error, 500/s served, 0 under-load
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restarts; CPU-bound ceiling ~1000–1500 read-ops/s scaling with per-node cores. ✅
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(read-tput, Ref-A). The 2.5× **write**-scaling proof is deferred to a ≥5-node
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Ref-B fleet with partitioned placement. ⏳ (Ref-B hardware.)
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- **G-O (Observability)** — proven by artifact + presence tests (the metric set,
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the dashboard, the alert group) rather than one behavioral test; the
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golden-signal coverage is the m11p8 exit-gate evidence.
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- **G-C (Continuous correctness)** — the *apparatus* is complete and green
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(the fault suite passes; the cron pipeline runs every named suite + the gated
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soak). The remaining half of the bar is **calendar**: 30 consecutive nightly-green
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days before GA. That cannot be completed in one session — the pipeline is what
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produces it. ⏳ (accrues nightly.)
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- **Ref-A line items** — the throughput / 100k-item / 1-hour-soak figures that
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must run on the live 3-region k3s cluster remain blocked on k3s access (the
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standing M11 caveat from m11p1–p3); the in-runner soak gates regressions
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locally and the same `tidal-stress` invocation targets Ref-A when reachable.
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