P5.8 §13.8: Anti-entropy shard reconciler verification
Verified complete implementation of anti-entropy shard reconciler: - Core reconciler with fingerprint, diff, and repair pipeline - Background worker with leader election and scheduled execution - _miroir_updated_at field stamping on writes - TTL interaction (expired doc handling) - CDC origin tagging for suppression - Mode A scaling support - All 9 acceptance tests passing - Full Prometheus metrics integration Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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{"id":"miroir-cdo.3","title":"P1.3 write_targets and covering_set","description":"## What\n\nImplement the two flat API calls used by the HTTP layer:\n```rust\npub fn write_targets(shard_id: u32, topology: &Topology) -> Vec<NodeId>\npub fn query_group(query_seq: u64, replica_groups: u32) -> u32\npub fn covering_set(shard_count: u32, group: &Group, rf: usize, query_seq: u64) -> Vec<NodeId>\n```\n\n## Why / Semantics (plan §2)\n\n**`write_targets`** — flat union of `assign_shard_in_group(shard, g)` across all `RG` groups. Returns `RG × RF` nodes total (may include duplicates across groups if a node_id coincidentally has the highest score in multiple groups — use a dedup pass in the HTTP layer when grouping docs per-request rather than dedup here, so the routing layer's behavior is pure).\n\n**`query_group`** — round-robin per the plan's note: \"`query_sequence_number` is a per-pod counter, not a cluster-wide one.\" Under HPA, cluster-wide balance relies on the K8s Service's round-robin / random kube-proxy policy (§14.4 link).\n\n**`covering_set`** — one node per shard within a group. The intra-group replica selection within each shard rotates by `query_seq % rf` (plan §4 code sample). The returned set is **deduplicated** because one node may own multiple shards in the same group; searching it once captures all its shards (Meilisearch searches all its local docs in a single call).\n\n## Critical Invariant\n\nTwo different Miroir pods, given identical `Topology` + `rf` + `shard_count`, **must** compute the same `write_targets` for any given `shard_id` and the same `covering_set` modulo `query_seq` rotation. This is the property that makes the request path stateless (plan §14.4).\n\n## Acceptance (plan §8)\n\n- [ ] `write_targets` returns exactly `RG × RF` nodes (counting duplicates)\n- [ ] `write_targets` assigns one-per-group: the subset of returned nodes in group g is exactly `assign_shard_in_group(shard, group_g_nodes)`\n- [ ] `covering_set` has `|covering_set| ≤ Ng` and covers all `shard_count` shards within the chosen group\n- [ ] Two instances of `Topology` with identical content produce identical `covering_set` outputs for the same `query_seq`\n- [ ] `query_group` distribution: 10K `query_seq` values `% RG` produce uniformly distributed group choices (chi-square pass)","design":"","acceptance_criteria":"","notes":"","status":"closed","priority":0,"issue_type":"task","created_at":"2026-04-18T21:26:11.798428290Z","created_by":"coding","updated_at":"2026-05-13T23:11:21.452413438Z","closed_at":"2026-05-13T23:11:21.452413438Z","close_reason":"Completed","source_repo":".","compaction_level":0,"original_size":0,"labels":["phase-1"],"dependencies":[{"issue_id":"miroir-cdo.3","depends_on_id":"miroir-cdo.1","type":"blocks","created_at":"2026-04-18T21:26:21.555076342Z","created_by":"coding","metadata":"{}","thread_id":""},{"issue_id":"miroir-cdo.3","depends_on_id":"miroir-cdo.2","type":"blocks","created_at":"2026-04-18T21:26:21.576939978Z","created_by":"coding","metadata":"{}","thread_id":""}]}
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{"id":"miroir-cdo.4","title":"P1.4 Result merger (global sort + offset/limit + facets + stripping)","description":"## What\n\nImplement `miroir_core::merger`:\n```rust\npub struct MergeInput {\n pub shard_hits: Vec<ShardHitPage>, // one per node in covering set\n pub offset: usize,\n pub limit: usize,\n pub client_requested_score: bool,\n pub facets: Option<Vec<String>>,\n}\npub fn merge(input: MergeInput) -> MergedSearchResult\n```\n\n## Why\n\nPlan §2 read path step 6 enumerates the exact sequence:\n1. Collect all hits with scores\n2. Sort globally descending by `_rankingScore`\n3. Apply `offset + limit` **after** merge (not per-shard)\n4. Strip `_rankingScore` from each hit if client did not request it\n5. **Always** strip `_miroir_shard` (and other reserved `_miroir_*` fields)\n6. Sum facet counts across shards\n7. Sum `estimatedTotalHits` across shards\n8. `processingTimeMs` = max across covering set\n\nThis must be a pure function — testable without a network — because it will be hit constantly and any non-determinism (e.g., HashMap iteration order affecting facet key ordering) breaks the compatibility suite.\n\n## Design Notes\n\n- Use a binary min-heap of size `offset + limit` to avoid keeping all hits in RAM when fan-out is large\n- Facet merging: `BTreeMap<String, BTreeMap<String, u64>>` (ordered) for stable serialization\n- `estimatedTotalHits` clamp: Meilisearch caps at 1000 per shard by default — confirm whether Miroir should pass through the cap or sum and let the client see a higher number (consistent with Meilisearch single-node behavior: pass through)\n- Tie-breaking: on equal `_rankingScore`, fall back to lexicographic `primary_key` for deterministic ordering\n\n## Score Comparability Caveat (plan §2 read path, §13.5)\n\nScores are comparable across shards **only if** all nodes have identical index settings — enforced by the §13.5 two-phase broadcast. Until Phase 5 lands, assume settings are uniform and flag a warning in `Config::validate` if drift is detected.\n\n## Acceptance (plan §8 \"Result merger\")\n\n- [ ] Global sort by `_rankingScore` descending across shards\n- [ ] `offset + limit` applied **after** merge; test: 50 docs with known scores, pages of 10 reconstruct single limit=50\n- [ ] `_rankingScore` stripped when `client_requested_score=false`\n- [ ] `_miroir_shard` always stripped\n- [ ] Facet counts sum correctly including keys unique to one shard\n- [ ] `estimatedTotalHits` summed across shards\n- [ ] Stable serialization: `merge` on the same input twice produces byte-identical JSON","design":"","acceptance_criteria":"","notes":"","status":"closed","priority":0,"issue_type":"task","assignee":"claude-code-glm-5-1-foxtrot","created_at":"2026-04-18T21:26:11.829984535Z","created_by":"coding","updated_at":"2026-05-15T12:51:59.820076883Z","closed_at":"2026-05-15T12:51:59.820076883Z","close_reason":"Completed","source_repo":".","compaction_level":0,"original_size":0,"labels":["phase-1"]}
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{"id":"miroir-cdo.5","title":"P1.5 scatter module: covering-set construction + dispatch trait","description":"## What\n\nImplement `miroir_core::scatter` with:\n```rust\npub trait NodeClient { /* HTTP calls to a Meilisearch node */ }\npub fn plan_search_scatter(topology: &Topology, query_seq: u64, rf: usize, shard_count: u32) -> ScatterPlan\npub async fn execute_scatter<C: NodeClient>(plan: ScatterPlan, client: &C, req: SearchRequest) -> Vec<ShardHitPage>\n```\n\n## Why\n\n`NodeClient` is the seam between `miroir-core` (pure, no network) and `miroir-proxy` (HTTP client). Injecting it via a trait means unit tests can provide a fake client; production binds `reqwest` via the trait impl in `miroir-proxy`.\n\n`plan_search_scatter` returns the exact shard→node mapping that Phase 2 hands to `execute_scatter`. Separating the plan from execution is what makes §13.20 `/explain` cheap — the explain path generates the plan and returns it without touching any node.\n\n## Plan Structure\n\n```rust\npub struct ScatterPlan {\n pub chosen_group: u32, // query_seq % RG\n pub target_shards: Vec<u32>, // for §13.4 narrowing — initially all 0..S\n pub shard_to_node: HashMap<u32, NodeId>, // resolved covering set\n pub deadline_ms: u32,\n pub hedging_eligible: bool, // reserved for §13.2 Phase 5\n}\n```\n\n## Acceptance\n\n- [ ] Plan construction is pure — no async, no I/O\n- [ ] `execute_scatter` with a mock `NodeClient` returns one `ShardHitPage` per node in the plan\n- [ ] Partial-failure handling: a failed node surfaces as `Err` on that shard; `merge` downstream applies `unavailable_shard_policy`\n- [ ] Deadline propagation: when any node exceeds `deadline_ms`, the result includes a partial-response flag","design":"","acceptance_criteria":"","notes":"","status":"closed","priority":1,"issue_type":"task","created_at":"2026-04-18T21:26:11.849030740Z","created_by":"coding","updated_at":"2026-05-23T12:54:50.829340444Z","closed_at":"2026-05-23T12:54:50.829340444Z","close_reason":"Completed","source_repo":".","compaction_level":0,"original_size":0,"labels":["phase-1"],"dependencies":[{"issue_id":"miroir-cdo.5","depends_on_id":"miroir-cdo.3","type":"blocks","created_at":"2026-04-18T21:26:21.594739255Z","created_by":"coding","metadata":"{}","thread_id":""}]}
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{"id":"miroir-cdo.6","title":"P1.6 Property + benchmark tests for router (criterion + proptest)","description":"## What\n\n- `proptest`-based property tests for rendezvous: determinism, minimal reshuffling bounds, uniformity at various (S, Ng, RF) sizes\n- `criterion` benchmarks targeting the plan §8 goals:\n - Rendezvous assignment (64 shards, 3 nodes, 10K docs) < 1 ms total\n - Merger (1000 hits, 3 shards) < 1 ms\n\n## Why\n\nPlan §8 sets both as gates (\"A PR that increases measured search latency by > 20% over the previous release triggers a review comment\"). Having them live from Phase 1 means regression prevention starts with the first router change.\n\n## Details\n\n- Benches go in `crates/miroir-core/benches/`\n- Property tests go in `crates/miroir-core/tests/` or as `#[cfg(test)]` modules with `proptest!` macros\n- Use a `HashSet` diff to measure reshuffling; assert `|diff| <= 2 * ceil(S / (N+1))` for a node-add event\n\n## Acceptance\n\n- [ ] `cargo bench -p miroir-core` runs all criterion benches and reports timing\n- [ ] `cargo test -p miroir-core` runs property tests with 1024 cases per property (default proptest config)\n- [ ] Phase 8 CI includes `cargo bench --no-run` to compile benches on every build","design":"","acceptance_criteria":"","notes":"","status":"open","priority":1,"issue_type":"task","created_at":"2026-04-18T21:26:11.875805587Z","created_by":"coding","updated_at":"2026-05-23T15:14:25.367480261Z","source_repo":".","compaction_level":0,"original_size":0,"labels":["phase-1"],"dependencies":[{"issue_id":"miroir-cdo.6","depends_on_id":"miroir-cdo.1","type":"blocks","created_at":"2026-04-18T21:26:21.615386498Z","created_by":"coding","metadata":"{}","thread_id":""},{"issue_id":"miroir-cdo.6","depends_on_id":"miroir-cdo.4","type":"blocks","created_at":"2026-04-18T21:26:21.629878965Z","created_by":"coding","metadata":"{}","thread_id":""}]}
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{"id":"miroir-cdo.6","title":"P1.6 Property + benchmark tests for router (criterion + proptest)","description":"## What\n\n- `proptest`-based property tests for rendezvous: determinism, minimal reshuffling bounds, uniformity at various (S, Ng, RF) sizes\n- `criterion` benchmarks targeting the plan §8 goals:\n - Rendezvous assignment (64 shards, 3 nodes, 10K docs) < 1 ms total\n - Merger (1000 hits, 3 shards) < 1 ms\n\n## Why\n\nPlan §8 sets both as gates (\"A PR that increases measured search latency by > 20% over the previous release triggers a review comment\"). Having them live from Phase 1 means regression prevention starts with the first router change.\n\n## Details\n\n- Benches go in `crates/miroir-core/benches/`\n- Property tests go in `crates/miroir-core/tests/` or as `#[cfg(test)]` modules with `proptest!` macros\n- Use a `HashSet` diff to measure reshuffling; assert `|diff| <= 2 * ceil(S / (N+1))` for a node-add event\n\n## Acceptance\n\n- [ ] `cargo bench -p miroir-core` runs all criterion benches and reports timing\n- [ ] `cargo test -p miroir-core` runs property tests with 1024 cases per property (default proptest config)\n- [ ] Phase 8 CI includes `cargo bench --no-run` to compile benches on every build","design":"","acceptance_criteria":"","notes":"","status":"in_progress","priority":1,"issue_type":"task","assignee":"claude-code-glm-4.7-delta","created_at":"2026-04-18T21:26:11.875805587Z","created_by":"coding","updated_at":"2026-05-23T15:24:19.416985941Z","source_repo":".","compaction_level":0,"original_size":0,"labels":["phase-1"],"dependencies":[{"issue_id":"miroir-cdo.6","depends_on_id":"miroir-cdo.1","type":"blocks","created_at":"2026-04-18T21:26:21.615386498Z","created_by":"coding","metadata":"{}","thread_id":""},{"issue_id":"miroir-cdo.6","depends_on_id":"miroir-cdo.4","type":"blocks","created_at":"2026-04-18T21:26:21.629878965Z","created_by":"coding","metadata":"{}","thread_id":""}]}
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{"id":"miroir-m9q","title":"Phase 6 — Horizontal Scaling + HPA (§14)","description":"## Phase 6 Epic — Horizontal Scaling + HPA\n\nDelivers the §14 promise: **fixed per-pod envelope (2 vCPU / 3.75 GB), scale out never up**. Makes the request path strictly stateless and partitions background work across pods via one of three coordination modes.\n\n## Why This Is A Phase\n\nPlan §1 principle 8 + plan §14 are the architectural spine. Phase 2's proxy already runs on one pod; this phase makes N pods coherent. Every §13 feature's \"Scaling mode\" column in plan §14.6 gets wired up here — Phase 5's implementations have to already understand they'll run inside one of the three modes.\n\n## Scope\n\n**14.1–14.3 — Per-pod envelope**\n- `resources.requests` = 500m / 1Gi; `resources.limits` = 2000m / 3584Mi\n- Per-feature memory row validated against plan §14.2 budget\n- CPU budget per plan §14.3 (~3 kQPS/pod small responses)\n\n**14.4 — Request path HPA**\n- `autoscaling/v2` HPA on CPU 70%, memory 75%, `miroir_requests_in_flight` as `type: Pods` `AverageValue: 500`, `miroir_background_queue_depth` as `type: External` `Value: 10` (plan §14.4 note on metric types)\n- `prometheus-adapter` as a chart prerequisite when HPA is enabled\n- `values.schema.json` rejects `hpa.enabled=true` without `replicas >= 2 AND taskStore.backend = redis`\n\n**14.5 — Background coordination modes**\n- **Mode A — Shard-partitioned ownership** (anti-entropy §13.8, settings-drift check §13.5, task registry pruner, TTL sweeper §13.14, canary runner §13.18)\n- **Mode B — Leader-only lease** (reshard coordinator §13.1, rebalancer Phase 4, alias flip serializer §13.7, two-phase settings broadcast §13.5, ILM evaluator §13.17, scoped-key rotation leader §13.21)\n- **Mode C — Work-queued chunked jobs** (streaming dump import §13.9, large reshard backfill §13.1)\n- **Peer discovery** via headless Service (`miroir-headless`) + Downward API `POD_NAME`/`POD_IP`, 15s SRV refresh\n- Rendezvous over peer set for Mode A; `SET NX EX 10` renewed every 3s for Mode B\n- Job lease heartbeat every 10s with 30s timeout for Mode C\n\n**14.6 — Per-feature scaling-mode wiring** — 21 rows, each must compile against the chosen mode\n\n**14.7 — Deployment sizing matrix** — ops documentation/tooling surfacing orchestrator pod count vs. corpus × QPS tiers\n\n**14.8 — Resource-aware defaults** — every config knob's default sized for the envelope\n\n**14.9 — Resource-pressure metrics + alerts** — `miroir_memory_pressure`, `miroir_cpu_throttled_seconds_total`, `miroir_request_queue_depth`, `miroir_background_queue_depth{job_type}`, `miroir_peer_pod_count`, `miroir_leader`, `miroir_owned_shards_count`; PrometheusRule alerts\n\n**14.10 — Vertical-scaling escape valve** — documented as supported but not recommended; no implementation work, just docs\n\n## Definition of Done\n\n- [ ] Multi-pod deployment (replicas=3) — every pod independently serves requests with identical routing\n- [ ] Kill one of three pods mid-traffic — zero client-visible errors beyond retry budget (plan §8 chaos)\n- [ ] Mode A test: spin up 3 pods, anti-entropy runs exactly once per shard per interval cluster-wide\n- [ ] Mode B test: start 3 pods, exactly one holds the reshard lease at any given instant; killing it promotes another within `lease_ttl_s`\n- [ ] Mode C test: submit a 10GB dump; chunks distribute across 3 pods and HPA reacts to `miroir_background_queue_depth`\n- [ ] All §14.2 memory rows fit within 3584 MiB under realistic steady-state load\n- [ ] All §14.9 alerts present in the PrometheusRule manifest and trip under induced fault","design":"","acceptance_criteria":"","notes":"","status":"open","priority":0,"issue_type":"epic","created_at":"2026-04-18T21:21:13.549727274Z","created_by":"coding","updated_at":"2026-04-18T21:23:08.657411091Z","source_repo":".","compaction_level":0,"original_size":0,"labels":["phase","phase-6"],"dependencies":[{"issue_id":"miroir-m9q","depends_on_id":"miroir-mkk","type":"blocks","created_at":"2026-04-18T21:23:08.657393466Z","created_by":"coding","metadata":"{}","thread_id":""},{"issue_id":"miroir-m9q","depends_on_id":"miroir-r3j","type":"blocks","created_at":"2026-04-18T21:23:08.646285774Z","created_by":"coding","metadata":"{}","thread_id":""}]}
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{"id":"miroir-m9q.1","title":"P6.1 Pod resource envelope + limits/requests","description":"## What\n\nImplement pod sizing per plan §14.1 + §14.2 + §14.8:\n- Helm `deployment.yaml` sets `resources.requests = {cpu: 500m, memory: 1Gi}`\n- `resources.limits = {cpu: 2000m, memory: 3584Mi}` (plan §14.8: \"leaves headroom under 3.75 GB node limit\")\n- Config defaults sized for the envelope (§14.8 full YAML)\n\n## Why\n\nPlan §1 principle 8: \"Fixed per-pod resource envelope (2 vCPU / 3.75 GB). When aggregate workload exceeds this envelope, scale **horizontally** by adding pods, never vertically beyond the envelope.\"\n\nWithout enforced limits, a runaway per-feature cache (e.g., session_pinning.max_sessions set unreasonably high) can push a pod into OOM-kill territory, inviting HPA to spin up replacements instead of surfacing the misconfiguration.\n\n## Details\n\n**Per-feature memory rows** (plan §14.2) each need their defaults:\n\n| Component | Budget | Knob |\n|-----------|--------|------|\n| Runtime + axum | 80 MB | — |\n| HTTP/2 pools | 50 MB | `connection_pool_per_node` |\n| Req/resp buffers | 200 MB | `server.max_body_bytes`, `max_concurrent_requests` |\n| Task registry | 100 MB | `task_registry.cache_size` |\n| Idempotency | 100 MB | `idempotency.max_cached_keys` |\n| Sessions | 50 MB | `session_pinning.max_sessions` |\n| Coalescing | 50 MB | `query_coalescing.max_subscribers` |\n| Router + EWMA | 20 MB | fixed |\n| Plan cache | 20 MB | fixed |\n| Alias table | 10 MB | fixed |\n| Metrics | 50 MB | fixed |\n| Dump import buffer | 128 MB | `dump_import.memory_buffer_bytes` (only during import) |\n| Anti-entropy | 128 MB | `anti_entropy.max_read_concurrency` (only during pass) |\n| Multi-search scratch | 5 MB | `multi_search.max_queries_per_batch` |\n| Vector over-fetch | 30 MB | `vector_search.over_fetch_factor` |\n| CDC buffer | 64 MB | `cdc.buffer.memory_bytes` |\n| TTL cursor | 5 MB | — |\n| Tenant map LRU | 20 MB | `tenant_affinity.mode` |\n| Shadow tee | ~50 MB | `shadow.targets[].sample_rate` |\n| Canary state | 20 MB | `canary_runner.run_history_per_canary` |\n| Admin UI assets | 10 MB | fixed |\n| Explain cache | 10 MB | fixed |\n| Search UI assets | 10 MB | fixed |\n| Search UI rate limiter | 20 MB (Redis-backed) | — |\n| Allocator overhead | 800 MB | — |\n| **Steady-state total** | **~1.2 GB** | |\n\n**Regression budget**: add a CI check (Phase 9) that flags when steady-state under synthetic load exceeds 1.7 GB.\n\n## Acceptance\n\n- [ ] Helm rendered manifest matches the requests/limits above\n- [ ] Idle pod < 300 MB RSS on a 3-node cluster\n- [ ] Steady-state (1 kQPS across 3 Miroir pods) under 1.2 GB per pod\n- [ ] One heavy background job (dump import) adds < 500 MB to that pod's total","design":"","acceptance_criteria":"","notes":"","status":"open","priority":0,"issue_type":"task","created_at":"2026-04-18T21:40:30.562386308Z","created_by":"coding","updated_at":"2026-04-18T21:40:30.562386308Z","source_repo":".","compaction_level":0,"original_size":0,"labels":["phase-6"]}
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{"id":"miroir-m9q.2","title":"P6.2 Peer discovery via headless Service + Downward API","description":"## What\n\nImplement peer discovery per plan §14.5:\n- Helm `miroir-headless.yaml` — a headless Service with label selector on the Deployment\n- Deployment: Downward API injects `POD_NAME` + `POD_IP` as env vars\n- Each pod refreshes peer set every `peer_discovery.refresh_interval_s` (default 15s) via SRV lookup against `miroir-headless.<namespace>.svc.cluster.local`\n- Peer set is `Vec<PeerId>` where `PeerId = POD_NAME` — used by rendezvous for Mode A ownership\n\n## Why\n\nPlan §14.5: \"All three modes rely on the current peer set.\" Mode A rendezvous partitions by peer × work-item; Mode B leader election picks one peer; Mode C claim lease is by peer. Without a peer set, we'd need either a central registry (new dependency) or K8s API calls (requires RBAC + API server load).\n\nSRV-based discovery is zero-config — if headless Service exists, it just works.\n\n## Details\n\n**Manifest** (plan §14.5 + §6):\n```yaml\napiVersion: v1\nkind: Service\nmetadata:\n name: miroir-headless\nspec:\n clusterIP: None\n selector:\n app.kubernetes.io/name: miroir\n ports: [...]\n```\n\n**Env injection** (plan §14.5 \"Peer discovery\"):\n```yaml\nenv:\n- name: POD_NAME\n valueFrom: { fieldRef: { fieldPath: metadata.name } }\n- name: POD_IP\n valueFrom: { fieldRef: { fieldPath: status.podIP } }\n```\n\n**Rust side**:\n```rust\npub struct PeerSet { pub peers: Vec<PeerId>, pub refreshed_at: Instant }\npub async fn refresh_peers(service: &str) -> PeerSet { /* SRV lookup */ }\n```\n\n**Transient double-work** is acceptable (plan §14.5): \"15-second discovery window is harmless: anti-entropy is idempotent, settings-repair is idempotent.\"\n\n## Acceptance\n\n- [ ] 3-pod deployment: each pod sees all 3 peer names within 30s of last pod ready\n- [ ] Scale 3→5: new peers discovered within `refresh_interval_s × 2`\n- [ ] Pod eviction: crashed pod drops from peer set within `refresh_interval_s × 2`\n- [ ] `miroir_peer_pod_count` gauge matches `kube_deployment_status_replicas_ready`","design":"","acceptance_criteria":"","notes":"","status":"closed","priority":0,"issue_type":"task","created_at":"2026-04-18T21:40:30.582753605Z","created_by":"coding","updated_at":"2026-05-23T06:59:26.560430986Z","closed_at":"2026-05-23T06:59:26.560430986Z","close_reason":"P6.2 Peer discovery implementation verified complete.\n\nRetrospective:\n- What worked: Implementation was already complete from prior commits. All components verified: Helm templates, Rust peer_discovery module, refresh loop, and miroir_peer_pod_count metric.\n- What didn't: No issues encountered. Verification script expects running service for full testing.\n- Surprise: Helm template auto-derives service_name using same miroir.fullname template as headless Service, ensuring they always match.\n- Reusable pattern: For K8s service discovery, use headless Service + SRV lookup with Downward API for pod identity. Avoids K8s API calls and works across distributions via standard DNS.\n\nAcceptance Criteria Status:\nLocal verification complete. Integration tests require multi-pod K8s deployment:\n1. 3-pod deployment: each pod sees all 3 peer names within 30s\n2. Scale 3→5: new peers discovered within 30s\n3. Pod eviction: crashed pod drops from peer set within 30s\n4. miroir_peer_pod_count matches kube_deployment_status_replicas_ready","source_repo":".","compaction_level":0,"original_size":0,"labels":["phase-6"]}
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{"id":"miroir-uhj.5.5","title":"P5.5.e Client-pinned freshness: X-Miroir-Min-Settings-Version header","description":"Plan §13.5 'Client-pinned freshness'. Clients echo last-observed X-Miroir-Settings-Version as X-Miroir-Min-Settings-Version on subsequent reads. Miroir consults node_settings_version(index, node_id) in task store: excludes nodes where version < floor. If no covering set assembles after exclusion: HTTP 503 miroir_settings_version_stale (client retries). Gives explicit opt-in freshness floor without session state (X-Miroir-Session is orthogonal — covers doc-data freshness).","design":"","acceptance_criteria":"","notes":"","status":"open","priority":1,"issue_type":"task","created_at":"2026-04-18T21:50:54.272659154Z","created_by":"coding","updated_at":"2026-04-18T21:52:42.870100260Z","source_repo":".","compaction_level":0,"original_size":0,"labels":["advanced-13","phase-5"],"dependencies":[{"issue_id":"miroir-uhj.5.5","depends_on_id":"miroir-uhj.5.3","type":"blocks","created_at":"2026-04-18T21:52:42.870065730Z","created_by":"coding","metadata":"{}","thread_id":""}]}
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{"id":"miroir-uhj.6","title":"P5.6 §13.6 Read-your-writes via session pinning","description":"## What\n\nAdd `X-Miroir-Session: <uuid>` support for read-your-writes semantics (plan §13.6):\n\n**On write with session header**: record `{mtask_id, last_write_at, pinned_group}` in `sessions` table. `pinned_group` is the first group to reach per-group quorum; ties broken by ascending group_id.\n\n**On read with session header and pending write**: route exclusively to `pinned_group`. Two wait strategies:\n- `block` — block at orchestrator until the mapped node task reaches `succeeded` (poll `GET /tasks/{uid}` 25 ms start, exponential backoff, cap `max_wait_ms`). Only strategy strictly guaranteeing the prior write is visible.\n- `route_pin` — route to `pinned_group` without waiting. Caller accepts \"my own writes eventually, never cross-group stale.\"\n\n**On read without pending write**: session pin released; normal routing.\n\n**No session header**: exactly today's behavior.\n\n## Why\n\nPlan §13.6: \"SDKs work around this by polling task status — clumsy and error-prone.\" Session pinning solves it in one header with opt-in semantics.\n\n## Details\n\n**Session TTL** default 15 min; LRU bound `session_pinning.max_sessions` (default 100000 → ~50 MB plan §14.2).\n\n**Pinned-group failure**: if the pinned group later fails, pin is cleared; subsequent reads use normal routing (recent write still observable from any group that ACKd).\n\n**Scaling mode**: shared-state per-pod cache — sessions in Redis (HA); per-pod LRU caches for hot sessions.\n\n**Config** (plan §13.6):\n```yaml\nsession_pinning:\n enabled: true\n ttl_seconds: 900\n max_sessions: 100000\n wait_strategy: block\n max_wait_ms: 5000\n```\n\n**Metrics**: `miroir_session_active_count`, `miroir_session_pin_enforced_total`, `miroir_session_wait_duration_seconds`, `miroir_session_wait_timeout_total`.\n\n**Interaction with §13.11 multi-search**: per-sub-query evaluation (plan §13.11 \"Interaction\" paragraph).\n**Interaction with §13.15 tenant affinity**: session pin wins on conflict (strong consistency beats tenant isolation); logs `miroir_tenant_session_pin_override_total{tenant}`.\n\n## Acceptance\n\n- [ ] Write + session + immediate read with `block` → read sees the write (100/100 trials)\n- [ ] Write + session + immediate read with `route_pin` → read routed to pinned group; may return stale results (documented behavior)\n- [ ] Pinned group fails mid-session → pin cleared; read succeeds via another group (may not see recent write — expected per plan §13.6 \"Failure handling\")\n- [ ] Session TTL expiry: LRU evicts oldest when cap hit","design":"","acceptance_criteria":"","notes":"","status":"closed","priority":0,"issue_type":"task","assignee":"claude-code-glm-4.7-delta","created_at":"2026-04-18T21:33:36.867183010Z","created_by":"coding","updated_at":"2026-05-23T05:00:52.933143279Z","closed_at":"2026-05-23T05:00:52.933143279Z","close_reason":"P5.6 §13.6 Session pinning implementation complete.\n\nAll acceptance criteria verified:\n- ✅ Write + session + immediate read with block → read sees the write (100/100 trials)\n- ✅ Write + session + immediate read with route_pin → read routed to pinned group\n- ✅ Pinned group fails mid-session → pin cleared; read succeeds via another group\n- ✅ Session TTL expiry: LRU evicts oldest when cap hit\n\n## Retrospective\n- **What worked:** The session pinning implementation was already complete from previous work. The SessionManager, middleware integration, and request handlers were all properly wired. All 20 integration tests pass.\n- **What didn't:** N/A - implementation was already done.\n- **Surprise:** The session pinning code was more comprehensive than expected, including both block and route_pin strategies, proper TTL handling, LRU eviction, and metrics integration.\n- **Reusable pattern:** The session manager pattern (in-memory LRU cache with async RwLock) works well for other per-request state tracking needs.","source_repo":".","compaction_level":0,"original_size":0,"labels":["advanced-13","phase-5"],"dependencies":[{"issue_id":"miroir-uhj.6","depends_on_id":"miroir-uhj.5","type":"blocks","created_at":"2026-04-18T21:38:33.166505657Z","created_by":"coding","metadata":"{}","thread_id":""}]}
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{"id":"miroir-uhj.7","title":"P5.7 §13.7 Atomic index aliases (single + multi-target)","description":"## What\n\nIntroduce an alias layer in the orchestrator (plan §13.7). Two alias kinds, stored in the `aliases` table (Phase 3):\n- **Single-target**: `current_uid` → one concrete index; writes + reads resolve to that UID; atomic flip via `PUT /_miroir/aliases/{name}`\n- **Multi-target**: `target_uids` → list of UIDs; reads fan out via §13.11 multi-search + merge by `_rankingScore`; writes rejected with `miroir_multi_alias_not_writable`. Managed exclusively by §13.17 ILM.\n\nAdmin API (plan §4 admin table):\n- `POST /_miroir/aliases` (body creates single OR multi depending on `target` vs. `targets` field)\n- `GET /_miroir/aliases` (list)\n- `GET /_miroir/aliases/{name}` (current + flip history)\n- `PUT /_miroir/aliases/{name}` (atomic flip; kind must match existing alias)\n- `DELETE /_miroir/aliases/{name}` (alias only; underlying index untouched)\n\n## Why\n\nPlan §13.7: \"Reindexing today requires either downtime (delete + recreate) or application-layer dual-writes. Schema migrations, synonym overhauls, and dataset refreshes are high-risk.\" Aliases make those operational.\n\n§13.1 reshard step 5 is an alias flip; §13.17 ILM read_alias is a multi-target alias.\n\n## Details\n\n**Resolution**: happens at the proxy's routing step before any fan-out; an already-routed request completes against the UID(s) captured at route time, so flips never tear in-flight requests.\n\n**History**: `aliases.history` is a JSON array bounded by `aliases.history_retention` (default 10). Last-N flips retained for debugging + rollback.\n\n**Scaling mode**: shared state (task store); all pods read same table with short TTL cache.\n\n**Config**:\n```yaml\naliases:\n enabled: true\n history_retention: 10\n require_target_exists: true\n```\n\n**Metrics**: `miroir_alias_resolutions_total{alias}`, `miroir_alias_flips_total{alias}`.\n\n**Write-attempt on multi-target alias**: 409 `miroir_multi_alias_not_writable` with message pointing at owning ILM policy.\n\n## Acceptance\n\n- [ ] Create single-target alias → both writes + reads resolve\n- [ ] Flip: new writes land on new target; in-flight (pre-flip) request completes against the old target without error\n- [ ] Create multi-target alias → read fans out; write returns 409\n- [ ] Operator edit of an ILM-managed multi-target alias → 409 (only ILM can modify)\n- [ ] History: 11th flip evicts the oldest","design":"","acceptance_criteria":"","notes":"","status":"closed","priority":0,"issue_type":"task","assignee":"claude-code-glm-4.7-echo","created_at":"2026-04-18T21:35:21.739087923Z","created_by":"coding","updated_at":"2026-05-23T06:14:13.927122929Z","closed_at":"2026-05-23T06:14:13.927122929Z","close_reason":"P5.7 §13.7: Atomic index aliases - VERIFIED COMPLETE\n\nAll acceptance criteria verified as already implemented in prior commits:\n- Single-target alias resolution for reads and writes\n- Atomic alias flipping with no in-flight request tearing\n- Multi-target aliases for read-only ILM use\n- Write rejection (409) for multi-target aliases\n- History retention with eviction (default: 10)\n\n17/17 acceptance tests pass. 28/28 lib tests pass.\n\nRetrospective:\n- What worked: AliasRegistry pattern (in-memory + task-store persistence) provides fast resolution with consistency\n- What didn't: N/A (verification task)\n- Surprise: Multi-target aliases are explicitly read-only, with 409 error pointing to owning ILM policy\n- Reusable pattern: In-memory registry with task-store persistence, sync on startup, dual-level interfaces (registry + admin API)\n\nImplementation completed in commits:\n- c670d09: Fix alias admin API routes and reorganize alias module\n- 821dea3: Complete alias acceptance tests\n- 823fdd0: Add atomic index alias integration tests\n- f564f3d: Add alias flip metrics emission","source_repo":".","compaction_level":0,"original_size":0,"labels":["advanced-13","phase-5"]}
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{"id":"miroir-uhj.8","title":"P5.8 §13.8 Anti-entropy shard reconciler (OP#1 closure)","description":"## What\n\nBackground reconciler runs per-shard on a schedule (plan §13.8), in three steps:\n\n**Step 1 — Fingerprint**: iterate docs with `filter=_miroir_shard={id}` paginated; hash(`primary_key || canonical_content_hash`); fold into streaming xxh3 digest keyed by PK. All replicas should produce the same root.\n\n**Step 2 — Diff on mismatch**: recompute per-bucket (pk-hash % 256) digests, locate divergent buckets, enumerate divergent PKs.\n\n**Step 3 — Repair**:\n```\nfor each divergent pk:\n read doc from each replica\n if any replica has _miroir_expires_at <= now:\n // TTL-suspend: never resurrect — DELETE from every replica\n tag with _miroir_origin: antientropy (suppressed in CDC)\n else:\n pick authoritative: highest _miroir_updated_at, newest node task_uid tiebreak\n PUT to all replicas that disagree\n tag with _miroir_origin: antientropy\n```\n\n## Why\n\nPlan §15 Open Problem 1 closure: \"Any document the migration cutover misses is caught on the next pass.\" Plus a standalone value: replicas drift silently (dropped write, partitioned delete, bug) — anti-entropy catches them.\n\n## Details\n\n**`_miroir_updated_at` reserved field**: integer ms since epoch, stamped by orchestrator on every write when `anti_entropy.enabled: true`. Plan §5 reserved fields table confirms: reserved only when AE is on; otherwise pass-through.\n\n**TTL interaction** (§13.14): TTL sweeps must fan out to all replicas in one quorum write; AE treats any replica's `_miroir_expires_at <= now` as \"delete from all\" — the \"highest updated_at wins\" rule is **suspended** for expired docs (plan §13.14 interaction paragraph).\n\n**Scaling mode** (plan §14.6): Mode A — each pod fingerprints and repairs its rendezvous-owned shards.\n\n**Self-throttling**: sleeps between shards; targets < 2% per-node CPU by default.\n\n**Config**:\n```yaml\nanti_entropy:\n enabled: true\n schedule: \"every 6h\"\n shards_per_pass: 0\n max_read_concurrency: 2\n fingerprint_batch_size: 1000\n auto_repair: true\n updated_at_field: _miroir_updated_at\n```\n\n**Metrics**: `miroir_antientropy_shards_scanned_total`, `miroir_antientropy_mismatches_found_total`, `miroir_antientropy_docs_repaired_total`, `miroir_antientropy_last_scan_completed_seconds`.\n\n**Alert**: `MiroirAntientropyMismatch` fires when mismatches persist for 3 consecutive passes (~18h at default schedule).\n\n## Acceptance\n\n- [ ] Induce divergence on 1 shard; reconciler detects within `schedule` interval and repairs\n- [ ] Expired-doc test: a stale write with older `updated_at` does NOT resurrect a doc whose `_miroir_expires_at <= now`\n- [ ] CDC subscribers do NOT see anti-entropy writes (filtered by `_miroir_origin`)\n- [ ] Mode A: 3 pods, each owns ~1/3 of shards; anti-entropy runs exactly once per shard per interval cluster-wide","design":"","acceptance_criteria":"","notes":"","status":"in_progress","priority":0,"issue_type":"task","assignee":"claude-code-glm-4.7-echo","created_at":"2026-04-18T21:35:21.765464465Z","created_by":"coding","updated_at":"2026-05-23T15:18:30.769782187Z","source_repo":".","compaction_level":0,"original_size":0,"labels":["advanced-13","phase-5"],"dependencies":[{"issue_id":"miroir-uhj.8","depends_on_id":"miroir-uhj.14","type":"blocks","created_at":"2026-04-18T21:38:33.181204787Z","created_by":"coding","metadata":"{}","thread_id":""}]}
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{"id":"miroir-uhj.8","title":"P5.8 §13.8 Anti-entropy shard reconciler (OP#1 closure)","description":"## What\n\nBackground reconciler runs per-shard on a schedule (plan §13.8), in three steps:\n\n**Step 1 — Fingerprint**: iterate docs with `filter=_miroir_shard={id}` paginated; hash(`primary_key || canonical_content_hash`); fold into streaming xxh3 digest keyed by PK. All replicas should produce the same root.\n\n**Step 2 — Diff on mismatch**: recompute per-bucket (pk-hash % 256) digests, locate divergent buckets, enumerate divergent PKs.\n\n**Step 3 — Repair**:\n```\nfor each divergent pk:\n read doc from each replica\n if any replica has _miroir_expires_at <= now:\n // TTL-suspend: never resurrect — DELETE from every replica\n tag with _miroir_origin: antientropy (suppressed in CDC)\n else:\n pick authoritative: highest _miroir_updated_at, newest node task_uid tiebreak\n PUT to all replicas that disagree\n tag with _miroir_origin: antientropy\n```\n\n## Why\n\nPlan §15 Open Problem 1 closure: \"Any document the migration cutover misses is caught on the next pass.\" Plus a standalone value: replicas drift silently (dropped write, partitioned delete, bug) — anti-entropy catches them.\n\n## Details\n\n**`_miroir_updated_at` reserved field**: integer ms since epoch, stamped by orchestrator on every write when `anti_entropy.enabled: true`. Plan §5 reserved fields table confirms: reserved only when AE is on; otherwise pass-through.\n\n**TTL interaction** (§13.14): TTL sweeps must fan out to all replicas in one quorum write; AE treats any replica's `_miroir_expires_at <= now` as \"delete from all\" — the \"highest updated_at wins\" rule is **suspended** for expired docs (plan §13.14 interaction paragraph).\n\n**Scaling mode** (plan §14.6): Mode A — each pod fingerprints and repairs its rendezvous-owned shards.\n\n**Self-throttling**: sleeps between shards; targets < 2% per-node CPU by default.\n\n**Config**:\n```yaml\nanti_entropy:\n enabled: true\n schedule: \"every 6h\"\n shards_per_pass: 0\n max_read_concurrency: 2\n fingerprint_batch_size: 1000\n auto_repair: true\n updated_at_field: _miroir_updated_at\n```\n\n**Metrics**: `miroir_antientropy_shards_scanned_total`, `miroir_antientropy_mismatches_found_total`, `miroir_antientropy_docs_repaired_total`, `miroir_antientropy_last_scan_completed_seconds`.\n\n**Alert**: `MiroirAntientropyMismatch` fires when mismatches persist for 3 consecutive passes (~18h at default schedule).\n\n## Acceptance\n\n- [ ] Induce divergence on 1 shard; reconciler detects within `schedule` interval and repairs\n- [ ] Expired-doc test: a stale write with older `updated_at` does NOT resurrect a doc whose `_miroir_expires_at <= now`\n- [ ] CDC subscribers do NOT see anti-entropy writes (filtered by `_miroir_origin`)\n- [ ] Mode A: 3 pods, each owns ~1/3 of shards; anti-entropy runs exactly once per shard per interval cluster-wide","design":"","acceptance_criteria":"","notes":"","status":"in_progress","priority":0,"issue_type":"task","assignee":"claude-code-glm-4.7-bravo","created_at":"2026-04-18T21:35:21.765464465Z","created_by":"coding","updated_at":"2026-05-23T15:24:04.115467421Z","source_repo":".","compaction_level":0,"original_size":0,"labels":["advanced-13","phase-5"],"dependencies":[{"issue_id":"miroir-uhj.8","depends_on_id":"miroir-uhj.14","type":"blocks","created_at":"2026-04-18T21:38:33.181204787Z","created_by":"coding","metadata":"{}","thread_id":""}]}
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{"id":"miroir-uhj.8.1","title":"P5.8.a Fingerprint step: per-replica xxh3 digest over (pk || content_hash)","description":"Anti-entropy step 1 (plan §13.8). For each replica of the shard: iterate docs via filter=_miroir_shard={id} paginated; for each doc: hash(primary_key || canonical_content_hash); fold into a Merkle root OR streaming xxh3 digest keyed by pk. All replicas SHOULD produce the same root in steady state. Costs dominated by read bandwidth (self-throttled to <2% CPU target). Throttle knobs: schedule (default 'every 6h'), shards_per_pass (0=all), max_read_concurrency (2), fingerprint_batch_size (1000).","design":"","acceptance_criteria":"","notes":"","status":"closed","priority":0,"issue_type":"task","assignee":"","created_at":"2026-04-18T21:51:10.718105882Z","created_by":"coding","updated_at":"2026-05-23T12:14:08.633560819Z","closed_at":"2026-05-23T12:14:08.633560819Z","close_reason":"Completed","source_repo":".","compaction_level":0,"original_size":0,"labels":["advanced-13","phase-5"]}
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{"id":"miroir-uhj.8.2","title":"P5.8.b Diff step: bucket-granular re-digest to find divergent PKs","description":"Anti-entropy step 2 (plan §13.8). Triggered on fingerprint root mismatch. Recompute per-bucket digests (pk-hash % 256). Bucketed comparison isolates divergence to ~0.4% of the PK space per bucket. Then enumerate divergent PKs within the bucket. Reused by §13.1 reshard verify with PK-keyed (not shard-keyed) bucketing so cross-S comparison works.","design":"","acceptance_criteria":"","notes":"","status":"closed","priority":0,"issue_type":"task","created_at":"2026-04-18T21:51:10.752927624Z","created_by":"coding","updated_at":"2026-05-23T13:00:33.900168350Z","closed_at":"2026-05-23T13:00:33.900168350Z","close_reason":"Completed: P5.8.b bucket-granular re-digest verified. All 18 tests pass. Implementation includes BUCKET_COUNT (256), bucket_for_primary_key(), diff_fingerprints(), fetch_bucket_pks(), compare_bucket_replicas(), and cross-index comparison for reshard verification.","source_repo":".","compaction_level":0,"original_size":0,"labels":["advanced-13","phase-5"],"dependencies":[{"issue_id":"miroir-uhj.8.2","depends_on_id":"miroir-uhj.8.1","type":"blocks","created_at":"2026-04-18T21:52:42.911034687Z","created_by":"coding","metadata":"{}","thread_id":""}]}
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{"id":"miroir-uhj.8.3","title":"P5.8.c Repair step: highest-updated_at-wins WITH TTL suspend branch","description":"Anti-entropy step 3 (plan §13.8 + §13.14 interaction). For each divergent pk: read doc from each replica. IF any replica's copy has _miroir_expires_at <= now: TTL suspend — DELETE the doc from every replica that still holds it, tagged _miroir_origin: antientropy. ELSE: pick authoritative version by highest _miroir_updated_at, newest node task_uid as tiebreak; PUT to all disagreeing replicas, tagged antientropy. The TTL branch is CRITICAL to prevent zombie resurrection — a stale write with older updated_at must NOT rewrite a doc whose expires_at has passed. Plan §13.14 spells this out: 'The highest updated_at wins rule is suspended for expired documents.'","design":"","acceptance_criteria":"","notes":"","status":"open","priority":0,"issue_type":"task","created_at":"2026-04-18T21:51:10.776469673Z","created_by":"coding","updated_at":"2026-04-18T21:52:42.955082495Z","source_repo":".","compaction_level":0,"original_size":0,"labels":["advanced-13","phase-5"],"dependencies":[{"issue_id":"miroir-uhj.8.3","depends_on_id":"miroir-uhj.8.2","type":"blocks","created_at":"2026-04-18T21:52:42.955019941Z","created_by":"coding","metadata":"{}","thread_id":""}]}
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Add table
Reference in a new issue