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tidaldb/docs/planning/milestone-12/phase-2.md
jordan fe8d0c87e7 harden: restore CI verification, remove four wire-level fabrications, instrument the 401 path 
Implements tmp/tidaldb-fleet-hardening (20 planned tasks + 2 found by measurement).

Ring 0 — restore verification. .woodpecker.yaml step pods ran at the namespace
default of 1500m/2Gi, which OOMKilled a prior pipeline and starved the release
gate past its budget. Both push-path steps now declare
backend_options.kubernetes.resources as two YAML anchors declared once on their
first consuming step. The values are CALIBRATED against measured free node
capacity, not against the LimitRange max: `requests: cpu 2` (this roadmap's
original figure) fits on NO node and would sit Pending forever, because
`ci-build-bounds` grants permission and the nodes supply capacity, and those are
not the same thing.

The `nightly` cron described in this file for 216 days was never created, so
tier-3 chaos, the fault classes, mTLS and the PITR test produced exactly zero
signal while reading like standing coverage. nightly-chaos and
nightly-security-ops now alias the anchors and have budgets matching the gate
(their 120/90 were TIGHTER on the same runner, so they would have failed
nightly for a budget reason, not a correctness one). nightly-soak is REMOVED,
not scheduled: it drives 1000 rps for 600s gating on p99 <= 250ms, and the best
node has 1700m free CPU, so it would fail on starvation rather than regression —
manufacturing a nightly false alarm. Its commands move verbatim to
docs/runbooks/nightly-soak.md.

Ring 1 — four fabrications removed from the wire.
- scatter_merge sorted and truncated without re-stamping rank, so /feed and
  /search returned 1,1,2 under full placement. Reuses merge_cross_shard's
  existing stamp; asserted on BOTH the multi-group merge path and the
  single-group [only] fast path that bypasses it.
- aggregate_region_row's None arm invented `applied_events: 0` plus a deficit
  derived from it. applied_events/lag_events are now Option<u64>, null on the
  wire. leader_last_seq was also unwrap_or(0), so a node that could not reach
  the LEADER computed 0 - applied = 0 for every region and reported a converged
  cluster it had never measured — a fabrication pointing the dangerous way.
- tidalctl inferred NO REPORT from `applied == 0 && lag > 0`. That heuristic was
  actively hiding the PVC-wipe shape: a measured zero with a real deficit
  rendered as "no report" instead of BEHIND. Now read off the wire; converged
  exits 0, partitioned still exits nonzero.
- /sharded/* answered 201/204 for single-copy writes with nothing anywhere
  saying so. Now requires `x-tidal-ack: local`, rejecting with 400 via the
  existing invalid_input path. Six call sites migrated, not the two this
  roadmap predicted — including docs/runbooks/cluster.md §16.3, which told
  operators to run a quorum-write probe via POST /sharded/items. That probe
  cannot verify quorum: the surface applies locally with no WAL append. It was
  used as the safety check between every step of a staged deploy earlier today.

Ring 2 — observability. JSON_LOGS was already implemented and the deployment
simply never asked for it; the StatefulSet now sets it, plus
TIDAL_SERVICE_NAME=tidaldb because enabling it silently renames the
VictoriaLogs `service` stream field and would have blinded every query keyed on
it. Adds tidaldb_usearch_replicated_vectors_total, incremented on BOTH the
origin (wal_blob_first -> Ok(Some)) and the follower apply path — counting only
the origin would mean each vector lands on exactly one node, replicas never
agree, and the alert built on it pages forever.

Found by measurement, not planned: the 401 path discarded every fact about
every rejection. Traefik has served 101,858 rejected requests to the public
ingress — 87.6% of all its traffic — with no record of who or why anywhere.
unauthorized_response now emits reason (missing_token vs invalid_token, the
distinction that separates a scanner from a rotation that missed a consumer)
and the forwarded client. The token is never logged.

Also: scripts/restore-fleet.sh --cluster started the soak monitor while
deliberately leaving its gate suspended, orphaning a watcher that has reported
"0/30 green nights" for 13 days. The pair now moves together. Doc-guard's
three-warning backlog is cleared with real backfill for M4/M6/M12.

Verified: fmt clean; clippy 5 crates 0 new warnings (74 vs 74 baseline,
counted in a detached worktree at HEAD); lib 2110 passed; cluster_sharding 5;
cluster_runbook 10; tidalctl 38; doc-guard 0 warnings. Playwright 32/34 with
the two remaining failures asserting the rank fix against the not-yet-rolled
image — they are the post-deploy proof.
2026-08-30 20:55:58 -06:00

3.1 KiB
Raw Blame History

m12p2 — ANN candidate generation in RETRIEVE (✅ COMPLETE 2026-06-14)

Landed in bb21e69; cache-invalidation fix da5d2d4. Changelog: CHANGELOG.md. Milestone index: README.md. Backfilled record. This is the G1 unblock.

What shipped

  1. CandidateStrategy::Ann is real. It previously fell back to a scan with a warning. The db layer now resolves the query vector — the user's preference vector for for_you, the seed item's embedding (similar_to) for related — and Stage 1 runs an O(ef_search) HNSW search over the item content slot instead of scanning an arbitrary low-id slice of the universe (tidal/src/query/executor/candidate_gen.rs, tidal/src/query/executor/pipeline.rs). for_you and related are now Ann profiles.
  2. Graceful, not conditional-on-luck. No vector registry, no preference vector, or no seed ⇒ it degrades to a scan. Anonymous reads and cold-start users still serve; every embedding-less schema and every pre-m12p2 caller is unchanged.
  3. trending stopped being an O(N) ledger scan. SignalRanked is now a cached per-signal-type top-K (tidal/src/signals/ledger/hot_top_k.rs): O(K) on the served path, with a bounded O(N) rebuild only when stale. The cache is sound because decay preserves relative order at a fixed λ, so it stays valid until the next write. Small ledgers rebuild on any write (always fresh); large ledgers throttle the rebuild off the read hot path (1 s). trending now uses SignalRanked(view), so it ranks the actually-viewed corpus at any id — not whatever happened to sit in the low-id scan slice.
  4. related over HTTP. GET /feed?profile=related&similar_to=<id> resolves the seed's embedding and runs ANN — "more like this" on the read surface (similar_to on FeedQuery, threaded through all three feed handlers).
  5. Harness support for measuring it. tidal-stress --feed-profile <name> forces every feed read to one profile (per-profile retrieve p99) and --seed-preferences builds a preference vector per user so for_you exercises ANN rather than the scan fallback.
  6. Cache correctness under replication (da5d2d4): the SignalRanked top-K cache is invalidated on CRDT reconciliation. Without that, a follower could serve a top-K assembled before reconciliation merged remote signal state.

Evidence

  • trending retrieve p99 = 3.5–7.7 ms under concurrent writes against a real 1536-D standalone server — inside the 10 ms G1 target — via the cached top-K.
  • for_you retrieve is ANN-backed at p99 ≈ 24 ms, dominated by the Stage-3 preference-boost recompute (a per-candidate embedding read). Recorded, not hidden, and flagged forward to m12p3's index/score tuning as the risk register's "materialized-score layer".
  • ANN candidate recall is the m12p1 /vector_search probe: 0.9997.
  • tidal/tests/m12p2_ann_retrieve.rs (5) — proves ANN, related, and trending reach relevant items at high ids that a scan can never reach, plus cache freshness.