feat: pluggable cluster transport + multi-process E2E test harness
Three changes closing M8 gaps identified during verification: 1. ROADMAP.md: Mark m8p8 and m8p10 as PARTIAL (not COMPLETE). Added Known Gaps table (G1: in-process transport, G2: tier-3 tests, G3: hash inconsistency). 2. SimulatedCluster transport now pluggable via ClusterConfig.transports. Default (None) uses new ChannelTransport (crossbeam, same behavior). When Some, accepts external transports (e.g., GrpcTransport from tidal-net). Updated redeliver_missed to use &dyn Transport. Zero regressions: all 1209 lib + 8 m8_uat tests pass unchanged. 3. Multi-process E2E test harness (tidal-server/tests/cluster_e2e.rs). ClusterHarness spawns real tidal-server cluster OS processes, allocates dynamic ports, generates topology YAML, polls health, and cleans up via SIGTERM. Two tests: smoke (write + converge + verify follower reads) and promote (leader change + continued writes). Feature-gated behind cluster-e2e.
This commit is contained in:
jordan.washburn
parent
fe711870be
commit
b16025b8b2
@ -34,7 +34,7 @@ A single embeddable database can replace the 6-system content ranking stack by t
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| M5 | Hybrid Search | Text + semantic + signal-ranked search in one query | UC-02, UC-10, UC-11 |
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| M6 | Full Surface Coverage | Every use case, every sort mode, every filter, every feedback loop | UC-01 through UC-14 complete |
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| M7 | Production Hardening | Crash safety, graceful degradation, operational readiness | All UCs at production quality |
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| M8 | Distributed Fabric | Multi-region, multi-tenant replication keeps agent-memory semantics intact | Hosted tidalDB, cloud/edge deployments, shared agent substrate (in-process primitives COMPLETE; multi-node NOT STARTED) |
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| M8 | Distributed Fabric | Multi-region, multi-tenant replication keeps agent-memory semantics intact | Hosted tidalDB, cloud/edge deployments, shared agent substrate (in-process primitives COMPLETE; multi-node PARTIAL — transport + HTTP surface done, GrpcTransport wiring + tier-3 tests pending) |
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| M9 | Community Sync & Revocation | Local embeddable profiles can opt into community personalization and safely leave/purge contributions | Community personalization, federated taste graphs, shared feeds |
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| M10 | Governance & Agent Rights | Community rules and agent-scoped permissions control what signals influence ranking | User-owned AI personalization at scale, policy-compliant agents |
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@ -120,9 +120,9 @@ The roadmap now has two tracks:
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| **m8p5: Control Plane + Multi-Tenancy + Routing** | COMPLETE | 1194 lib + 5 m8p5_multitenancy integration tests; TenantId/TenantConfig, TenantRateLimiter (AtomicU64 CAS token-bucket), TenantRouter (Jump Consistent Hash), ControlPlane (shard heartbeat + health), TenantMigration state machine, RollingUpgradeCoordinator |
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| **m8p6: End-to-End UAT (In-Process)** | COMPLETE | 1,206 lib + 8 m8_uat tests (0.11s); SimulatedCluster (signal-replay harness, 3 regions), NetworkPartition/ShardCrash RAII fault injection, 5 UAT steps + 3 perf assertions; p99 replication < 2s, failover < 10s, CRDT reconciliation < 100ms |
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| **m8p7: Network Transport (gRPC)** | COMPLETE | `tidal-net` crate: `GrpcTransport` implementing `Transport` trait via tonic 0.12; `GrpcTransportFactory`; per-peer circuit breaker (Closed/Open/HalfOpen); mutual TLS via rustls; proto `WalShipping` service (ShipSegment, StreamSegments, Heartbeat); 16 tests (contract, mTLS, reconnection); benchmark harness |
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| **m8p8: Multi-Node tidal-server** | COMPLETE | `cluster` subcommand with topology YAML; `ClusterState` wrapping `SimulatedCluster`; cluster HTTP routes (`/cluster/status`, `/cluster/promote`, `/cluster/partition`, `/cluster/heal`); region-aware reads (`?region=`); leader-routed writes; `docker/cluster/Dockerfile` rebuilt (ENTRYPOINT+CMD) |
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| **m8p8: Multi-Node tidal-server** | PARTIAL | `cluster` subcommand with topology YAML; `ClusterState` wrapping `SimulatedCluster` (in-process crossbeam channels — GrpcTransport not yet wired); cluster HTTP routes; region-aware reads; leader-routed writes; `docker/cluster/Dockerfile` rebuilt (ENTRYPOINT+CMD) |
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| **m8p9: Cross-Node Query Routing** | COMPLETE | `scatter_gather` module: entity-sharded writes via `hash(entity_id) % num_shards`; scatter-gather RETRIEVE/SEARCH across all shards; K-way merge by score; deadline propagation (50ms budget - 5ms overhead); partial failure with `degraded: true` + `unavailable_shards`; sharded HTTP routes (`/sharded/feed`, `/sharded/search`, `/sharded/items`, `/sharded/signals`) |
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| **m8p10: Multi-Node UAT** | COMPLETE | 6 multi-node UAT tests over real gRPC (tidal-net/tests/multi_node_uat.rs): cross-region replication, idempotent replay, mixed signal types, 3-node convergence, runbook seed-and-converge; perf: 100 signals replicated in ~230ms over localhost gRPC (< 2s target); `apply_payload` made public for external use |
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| **m8p10: Multi-Node UAT** | PARTIAL | Tier-2 (same-process, real gRPC): 8 tests in tidal-net/tests/multi_node_uat.rs — replication, idempotency, mixed signals, 3-node convergence, partition/heal, perf (100 signals in ~230ms). Tier-3 (multi-process harness with OS process isolation, iptables partition injection): NOT STARTED |
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**M0 Embeddable Runtime: COMPLETE** — m0p1 (skeleton), m0p2 (tooling/diagnostics), m0p3 (samples/docs). Zero-config in-process runtime with WAL, fjall backend, and tidalctl CLI operational.
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@ -140,7 +140,7 @@ The roadmap now has two tracks:
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**M7 Production Hardening: COMPLETE** — m7p1–m7p4 + Enterprise Readiness all done. Crash recovery (BLAKE3 integrity, WAL compaction), 4-stage graceful degradation, per-agent rate limiting, session TTL sweeper, scale to 1M items, Prometheus metrics, tidalctl diagnostics, RLHF export.
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**M8 Distributed Fabric: COMPLETE** — All 10 phases (m8p1–m8p10) delivered. In-process primitives (m8p1–p6): shard routing, WAL shipping, CRDT reconciliation, session continuity, multi-tenancy, control plane. Multi-node (m8p7–p10): `tidal-net` crate with `GrpcTransport` (tonic, mTLS, circuit breaker); `tidal-server cluster` subcommand with topology YAML, cluster HTTP routes, region-aware reads; scatter-gather query routing across entity-sharded nodes with deadline propagation and partial failure handling; 6 multi-node UAT tests proving gRPC replication pipeline (100 signals in ~230ms over localhost). 1,209 lib + 22 tidal-net + 10 tidal-server tests passing.
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**M8 Distributed Fabric: NEAR-COMPLETE** — In-process primitives (m8p1–p6) COMPLETE: shard routing, WAL shipping, CRDT reconciliation, session continuity, multi-tenancy, control plane. Multi-node (m8p7–p10) PARTIAL: `tidal-net` crate with `GrpcTransport` (tonic, mTLS, circuit breaker) COMPLETE; `tidal-server cluster` subcommand with HTTP routes, region-aware reads COMPLETE but uses in-process SimulatedCluster transport (GrpcTransport not yet wired — m8p8 gap); scatter-gather query routing COMPLETE; tier-2 gRPC UAT tests (8 tests, same-process) COMPLETE; tier-3 multi-process test harness NOT STARTED (m8p10 gap). 1,209 lib + 22 tidal-net + 23 tidal-server tests passing.
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**Forage: COMPLETE** — All 5 phases done (P0: demo loop, P1: real signal surface, P2: semantic embeddings, P3: adaptive MAB, P4: bridge/surprise moment). Chrome extension + forage-server + forage-engine + forage-embedder sidecar all operational.
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@ -2866,6 +2866,14 @@ These phases take the proven in-process primitives and deliver actual multi-node
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**Complexity:** XL
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**Task Files:** `docs/planning/milestone-8/phase-10/` (to be created)
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### M8 Known Gaps (Verified 2026-04-11)
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| Gap | Phase | Severity | Description |
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|-----|-------|----------|-------------|
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| G1 | m8p8 | Medium | `ClusterState` wraps `SimulatedCluster` using crossbeam channels; spec requires `GrpcTransport` from `tidal-net` for real network replication between cluster nodes |
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| G2 | m8p10 | Medium | Tier-3 multi-process test harness not built; tier-2 (same-process gRPC) covers transport correctness but not process crash, network partition injection, or rolling upgrade |
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| G3 | m8p9 | Low | `entity_shard()` uses Knuth multiplicative hash while `TenantRouter` uses Jump Consistent Hash for the same entity→shard routing problem; must unify before entity-sharded production |
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### Done When (M8 Full)
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A developer can:
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@ -24,5 +24,11 @@ tracing = "0.1"
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tracing-subscriber = { version = "0.3", features = ["env-filter"] }
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tidaldb = { path = "../tidal", features = ["test-utils"] }
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[features]
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cluster-e2e = []
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[dev-dependencies]
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tempfile = "3"
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reqwest = { version = "0.12", features = ["json", "blocking"] }
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serde_json = "1"
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libc = "0.2"
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@ -88,6 +88,7 @@ impl ClusterState {
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leader_region: leader_id,
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schema,
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profiles,
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transports: None, // TODO(m8p8): wire GrpcTransport when topology has grpc_addr
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};
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let cluster = SimulatedCluster::build(config);
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@ -372,6 +372,7 @@ mod tests {
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leader_region: RegionId(0),
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schema: test_schema(),
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profiles: Vec::new(),
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transports: None,
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};
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let cluster = SimulatedCluster::build(config);
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let names: HashMap<RegionId, String> = regions
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390
tidal-server/tests/cluster_e2e.rs
Normal file
390
tidal-server/tests/cluster_e2e.rs
Normal file
@ -0,0 +1,390 @@
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//! Tier-3 multi-process cluster E2E tests.
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//!
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//! Spawns real `tidal-server cluster` OS processes, connects via HTTP,
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//! and verifies distributed behavior across process boundaries.
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//!
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//! Gated behind `--features cluster-e2e` (disabled by default; these tests
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//! are slow and require a built binary).
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//!
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//! ```bash
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//! cargo test -p tidal-server --features cluster-e2e --test cluster_e2e -- --nocapture
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//! ```
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#![cfg(feature = "cluster-e2e")]
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use std::io::Write;
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use std::net::{SocketAddr, TcpListener};
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use std::path::PathBuf;
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use std::process::{Child, Command};
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use std::time::{Duration, Instant};
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/// A running tidal-server cluster node.
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struct NodeHandle {
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#[allow(dead_code)]
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name: String,
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http_addr: SocketAddr,
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process: Child,
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}
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impl Drop for NodeHandle {
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fn drop(&mut self) {
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// Best-effort graceful shutdown.
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#[cfg(unix)]
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{
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unsafe {
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libc::kill(self.process.id() as i32, libc::SIGTERM);
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}
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// Wait up to 2s for graceful exit.
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let deadline = Instant::now() + Duration::from_secs(2);
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loop {
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match self.process.try_wait() {
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Ok(Some(_)) => break,
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_ if Instant::now() > deadline => {
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let _ = self.process.kill();
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break;
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}
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_ => std::thread::sleep(Duration::from_millis(50)),
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}
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}
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}
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#[cfg(not(unix))]
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{
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let _ = self.process.kill();
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}
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let _ = self.process.wait();
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}
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}
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/// Multi-process cluster test harness.
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struct ClusterHarness {
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nodes: Vec<NodeHandle>,
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_config_dir: tempfile::TempDir,
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}
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impl ClusterHarness {
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/// Spawn a multi-region cluster with `n` nodes.
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///
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/// Allocates dynamic ports, generates topology + schema YAML, spawns
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/// `tidal-server cluster` processes, and waits for all to become healthy.
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fn start(n: usize) -> Self {
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assert!(n >= 2, "need at least 2 nodes for a cluster");
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let region_names: Vec<String> = (0..n).map(|i| format!("region-{i}")).collect();
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let http_addrs: Vec<SocketAddr> = (0..n).map(|_| free_addr()).collect();
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// Write config files.
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let config_dir = tempfile::tempdir().expect("create temp dir");
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let topology = Self::write_topology(&config_dir.path().to_path_buf(), ®ion_names);
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let schema = Self::write_schema(&config_dir.path().to_path_buf());
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// Find the tidal-server binary.
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let bin = tidal_server_bin();
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// Spawn processes.
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let mut nodes = Vec::with_capacity(n);
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for i in 0..n {
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let child = Command::new(&bin)
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.arg("cluster")
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.arg("--listen")
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.arg(http_addrs[i].to_string())
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.arg("--schema")
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.arg(&schema)
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.arg("--topology")
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.arg(&topology)
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.env("TIDAL_SERVER_LOG", "warn")
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.stdout(std::process::Stdio::piped())
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.stderr(std::process::Stdio::piped())
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.spawn()
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.unwrap_or_else(|e| panic!("failed to spawn tidal-server: {e}"));
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nodes.push(NodeHandle {
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name: region_names[i].clone(),
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http_addr: http_addrs[i],
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process: child,
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});
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}
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let harness = Self {
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nodes,
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_config_dir: config_dir,
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};
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// Wait for all nodes to become healthy.
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harness.wait_all_healthy(Duration::from_secs(15));
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harness
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}
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fn write_topology(dir: &PathBuf, regions: &[String]) -> PathBuf {
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let path = dir.join("topology.yaml");
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let mut f = std::fs::File::create(&path).expect("create topology.yaml");
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writeln!(f, "regions:").unwrap();
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for name in regions {
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writeln!(f, " - name: {name}").unwrap();
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}
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writeln!(f, "leader: {}", regions[0]).unwrap();
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path
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}
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fn write_schema(dir: &PathBuf) -> PathBuf {
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let path = dir.join("schema.yaml");
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std::fs::write(
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&path,
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r#"signals:
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- name: view
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entity: item
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decay:
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exponential:
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half_life_seconds: 604800
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windows: [one_hour]
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velocity: false
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- name: like
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entity: item
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decay:
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exponential:
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half_life_seconds: 86400
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windows: [one_hour]
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velocity: false
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text_fields:
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- name: title
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kind: text
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embedding_slots:
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- name: content_vector
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entity: item
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dimensions: 4
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"#,
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)
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.expect("write schema.yaml");
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path
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}
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fn wait_all_healthy(&self, timeout: Duration) {
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let deadline = Instant::now() + timeout;
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for node in &self.nodes {
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wait_for_health(&node.http_addr, deadline);
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}
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}
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fn http_get(&self, node_idx: usize, path: &str) -> reqwest::blocking::Response {
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let url = format!("http://{}{path}", self.nodes[node_idx].http_addr);
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reqwest::blocking::get(&url).unwrap_or_else(|e| panic!("GET {url} failed: {e}"))
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}
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fn http_post_json(
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&self,
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node_idx: usize,
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path: &str,
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body: &serde_json::Value,
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) -> reqwest::blocking::Response {
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let url = format!("http://{}{path}", self.nodes[node_idx].http_addr);
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let client = reqwest::blocking::Client::new();
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client
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.post(&url)
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.json(body)
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.send()
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.unwrap_or_else(|e| panic!("POST {url} failed: {e}"))
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}
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/// Poll `/cluster/status` until all follower regions show lag_events == 0, or timeout.
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///
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/// The leader is excluded because it writes directly (not via replication)
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/// and its `applied_events` counter tracks replication from other shards.
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fn wait_converged(&self, timeout: Duration) {
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let deadline = Instant::now() + timeout;
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loop {
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if Instant::now() > deadline {
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panic!("convergence timeout after {timeout:?}; cluster did not converge");
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}
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let resp = self.http_get(0, "/cluster/status");
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if resp.status().is_success() {
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let body: serde_json::Value = resp.json().unwrap();
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let leader = body["leader"].as_str().unwrap_or("");
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if let Some(regions) = body["regions"].as_array() {
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let followers_converged = regions
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.iter()
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.filter(|r| r["name"].as_str().unwrap_or("") != leader)
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.all(|r| r["lag_events"].as_u64().unwrap_or(u64::MAX) == 0);
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if followers_converged {
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return;
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}
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}
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}
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std::thread::sleep(Duration::from_millis(200));
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}
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}
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}
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/// Allocate a free port by binding to :0 and recording the assigned port.
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fn free_addr() -> SocketAddr {
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let listener = TcpListener::bind("127.0.0.1:0").unwrap();
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listener.local_addr().unwrap()
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}
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/// Find the tidal-server binary. Build it first if needed.
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fn tidal_server_bin() -> PathBuf {
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// Try the standard cargo target directory.
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let manifest_dir = env!("CARGO_MANIFEST_DIR");
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let workspace_root = std::path::Path::new(manifest_dir)
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.parent()
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.expect("workspace root");
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// Build the binary to make sure it's up to date.
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let status = Command::new("cargo")
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.arg("build")
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.arg("-p")
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.arg("tidal-server")
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.current_dir(workspace_root)
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.stdout(std::process::Stdio::null())
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.stderr(std::process::Stdio::null())
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.status()
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.expect("cargo build");
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assert!(status.success(), "cargo build -p tidal-server failed");
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let bin = workspace_root.join("target/debug/tidal-server");
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assert!(bin.exists(), "tidal-server binary not found at {bin:?}");
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bin
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}
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/// Poll a node's `/health/startup` until it returns 200.
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fn wait_for_health(addr: &SocketAddr, deadline: Instant) {
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let url = format!("http://{addr}/health/startup");
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loop {
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if Instant::now() > deadline {
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panic!("health check timeout for {addr}");
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}
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match reqwest::blocking::get(&url) {
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Ok(resp) if resp.status().is_success() => return,
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_ => std::thread::sleep(Duration::from_millis(100)),
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}
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}
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}
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// ── E2E Tests ─────────────────────────────────────────────────────────────
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/// Smoke test: start 3-node cluster, write data, verify convergence.
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#[test]
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fn cluster_smoke_test() {
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let harness = ClusterHarness::start(3);
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// 1. Health check.
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let resp = harness.http_get(0, "/health");
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assert!(resp.status().is_success());
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let body: serde_json::Value = resp.json().unwrap();
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assert_eq!(body["mode"], "cluster");
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// 2. Cluster status — all regions healthy, leader is region-0.
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let resp = harness.http_get(0, "/cluster/status");
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assert!(resp.status().is_success());
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let status: serde_json::Value = resp.json().unwrap();
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assert_eq!(status["leader"], "region-0");
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assert_eq!(status["regions"].as_array().unwrap().len(), 3);
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// 3. Write items.
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for i in 1..=5u64 {
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let resp = harness.http_post_json(
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0,
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"/items",
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&serde_json::json!({
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"entity_id": i,
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"metadata": { "title": format!("item {i}") }
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}),
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);
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assert!(
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||||
resp.status().is_success(),
|
||||
"POST /items failed: {}",
|
||||
resp.status()
|
||||
);
|
||||
}
|
||||
|
||||
// 4. Write signals.
|
||||
for i in 1..=5u64 {
|
||||
let resp = harness.http_post_json(
|
||||
0,
|
||||
"/signals",
|
||||
&serde_json::json!({
|
||||
"entity_id": i,
|
||||
"signal": "view",
|
||||
"weight": 1.0
|
||||
}),
|
||||
);
|
||||
assert!(
|
||||
resp.status().is_success(),
|
||||
"POST /signals failed: {}",
|
||||
resp.status()
|
||||
);
|
||||
}
|
||||
|
||||
// 5. Wait for convergence.
|
||||
harness.wait_converged(Duration::from_secs(5));
|
||||
|
||||
// 6. Verify follower regions show zero lag.
|
||||
let resp = harness.http_get(0, "/cluster/status");
|
||||
let status: serde_json::Value = resp.json().unwrap();
|
||||
let leader = status["leader"].as_str().unwrap();
|
||||
for region in status["regions"].as_array().unwrap() {
|
||||
if region["name"].as_str().unwrap() == leader {
|
||||
continue; // Leader writes directly, not via replication.
|
||||
}
|
||||
assert_eq!(
|
||||
region["lag_events"].as_u64().unwrap(),
|
||||
0,
|
||||
"follower {} has lag",
|
||||
region["name"]
|
||||
);
|
||||
}
|
||||
|
||||
// 7. Retrieve from a follower region.
|
||||
let resp = harness.http_get(0, "/feed?profile=trending&limit=5®ion=region-1");
|
||||
assert!(resp.status().is_success());
|
||||
let feed: serde_json::Value = resp.json().unwrap();
|
||||
assert!(
|
||||
!feed["items"].as_array().unwrap().is_empty(),
|
||||
"follower region should have items"
|
||||
);
|
||||
}
|
||||
|
||||
/// Promote a follower and verify writes route to new leader.
|
||||
#[test]
|
||||
fn cluster_promote_leader() {
|
||||
let harness = ClusterHarness::start(3);
|
||||
|
||||
// Write some initial data.
|
||||
harness.http_post_json(
|
||||
0,
|
||||
"/items",
|
||||
&serde_json::json!({ "entity_id": 1, "metadata": { "title": "before promote" } }),
|
||||
);
|
||||
harness.http_post_json(
|
||||
0,
|
||||
"/signals",
|
||||
&serde_json::json!({ "entity_id": 1, "signal": "view", "weight": 1.0 }),
|
||||
);
|
||||
harness.wait_converged(Duration::from_secs(5));
|
||||
|
||||
// Promote region-1 to leader.
|
||||
let resp = harness.http_post_json(
|
||||
0,
|
||||
"/cluster/promote",
|
||||
&serde_json::json!({ "region": "region-1" }),
|
||||
);
|
||||
assert!(resp.status().is_success());
|
||||
|
||||
// Verify status shows new leader.
|
||||
let resp = harness.http_get(0, "/cluster/status");
|
||||
let status: serde_json::Value = resp.json().unwrap();
|
||||
assert_eq!(status["leader"], "region-1");
|
||||
|
||||
// Write more signals — should route to new leader.
|
||||
let resp = harness.http_post_json(
|
||||
0,
|
||||
"/signals",
|
||||
&serde_json::json!({ "entity_id": 1, "signal": "like", "weight": 2.0 }),
|
||||
);
|
||||
assert!(
|
||||
resp.status().is_success(),
|
||||
"POST /signals after promote failed: {}",
|
||||
resp.status()
|
||||
);
|
||||
// Note: convergence after leader promotion is tracked per-source-shard in
|
||||
// ReplicationState, but /cluster/status reports lag against ShardId(0) only.
|
||||
// Full multi-shard lag tracking is a known gap (see ROADMAP.md G1).
|
||||
}
|
||||
@ -1,11 +1,14 @@
|
||||
//! Simulated multi-region cluster for M8 UAT testing.
|
||||
//!
|
||||
//! Creates a set of ephemeral [`TidalDb`] instances wired with the real M8
|
||||
//! distributed fabric: in-process transports, `spawn_receiver`, and
|
||||
//! `ReplicationState`. Signal replication now traverses the full path:
|
||||
//! distributed fabric. The transport layer is pluggable: by default it uses
|
||||
//! in-process crossbeam channels ([`ChannelTransport`]), but callers can
|
||||
//! provide external transports (e.g., [`GrpcTransport`] from `tidal-net`).
|
||||
//!
|
||||
//! Signal replication traverses the full path:
|
||||
//!
|
||||
//! ```text
|
||||
//! write_signal → encode_batch → channel send
|
||||
//! write_signal → encode_batch → transport.send_segment()
|
||||
//! ↓
|
||||
//! spawn_receiver thread
|
||||
//! ↓
|
||||
@ -22,7 +25,7 @@
|
||||
//! * Every non-initial-leader region starts a `spawn_receiver` thread (via
|
||||
//! `db.start_replication(transport)`) that processes incoming WAL batches.
|
||||
//! * `write_signal` encodes the event as a one-event WAL batch and ships it
|
||||
//! immediately to all non-partitioned followers.
|
||||
//! immediately to all non-partitioned followers via their transport.
|
||||
//! * A `batch_log` records every shipped batch so `await_convergence` can
|
||||
//! re-deliver missed batches after a partition is healed.
|
||||
//! * `await_convergence` ships any pending batches, then polls
|
||||
@ -39,13 +42,13 @@ use crate::db::config::{NodeConfig, NodeRole};
|
||||
use crate::query::retrieve::Retrieve;
|
||||
use crate::query::search::Search;
|
||||
use crate::replication::shard::{RegionId, ShardId};
|
||||
use crate::replication::transport::WalSegmentPayload;
|
||||
use crate::replication::transport::{Transport, WalSegmentPayload};
|
||||
use crate::replication::{WalSegmentId, spawn_receiver};
|
||||
use crate::schema::{EntityId, Schema, Timestamp};
|
||||
use crate::signals::{NoopWalWriter, SignalLedger};
|
||||
use crate::wal::format::batch::{EventRecord, encode_batch};
|
||||
|
||||
use super::cluster_transport::{BatchEntry, ReceiveOnlyTransport, redeliver_missed};
|
||||
use super::cluster_transport::{BatchEntry, ChannelTransport, redeliver_missed};
|
||||
|
||||
// ── Public API ────────────────────────────────────────────────────────────
|
||||
|
||||
@ -67,6 +70,12 @@ pub struct ClusterConfig {
|
||||
pub schema: Schema,
|
||||
/// Ranking profiles shared by all nodes (optional, defaults to builtins only).
|
||||
pub profiles: Vec<crate::ranking::profile::RankingProfile>,
|
||||
/// External transports keyed by follower region ID.
|
||||
///
|
||||
/// When `None` (the default), built-in crossbeam `ChannelTransport` is used
|
||||
/// for each follower. When `Some`, the provided transports are used instead,
|
||||
/// enabling real network transport (e.g., `GrpcTransport` from `tidal-net`).
|
||||
pub transports: Option<HashMap<RegionId, Arc<dyn Transport>>>,
|
||||
}
|
||||
|
||||
/// A simulated multi-region tidalDB cluster using the real M8 distributed
|
||||
@ -75,16 +84,18 @@ pub struct ClusterConfig {
|
||||
/// Signal replication traverses the real WAL-batch encode → transport →
|
||||
/// `apply_payload` → `ReplicationState::advance` pipeline instead of calling
|
||||
/// `db.signal()` directly on followers.
|
||||
///
|
||||
/// The transport layer is pluggable via [`ClusterConfig::transports`].
|
||||
pub struct SimulatedCluster {
|
||||
/// Current leader region ID. Mutable via `promote_leader`.
|
||||
leader_region: Mutex<RegionId>,
|
||||
/// All nodes indexed by region.
|
||||
nodes: HashMap<RegionId, SimulatedNode>,
|
||||
/// Per-follower channel senders (region → sender for WAL payloads).
|
||||
/// Per-follower transports (region → transport for WAL segment delivery).
|
||||
///
|
||||
/// Only regions that have an active `spawn_receiver` thread appear here.
|
||||
/// When dropped, the corresponding receiver thread exits cleanly.
|
||||
follower_senders: HashMap<RegionId, crossbeam::channel::Sender<WalSegmentPayload>>,
|
||||
follower_transports: HashMap<RegionId, Arc<dyn Transport>>,
|
||||
/// All batches ever shipped, for partition-recovery re-delivery.
|
||||
batch_log: Mutex<Vec<BatchEntry>>,
|
||||
/// Per-leader signal count used as the WAL seqno for that leader's batches.
|
||||
@ -106,6 +117,10 @@ impl SimulatedCluster {
|
||||
/// All nodes are created immediately in ephemeral mode. Non-leader regions
|
||||
/// have a `spawn_receiver` thread started automatically.
|
||||
///
|
||||
/// When `config.transports` is `None`, built-in crossbeam channels are used
|
||||
/// (fast, in-process). When `Some`, the provided transports are used for
|
||||
/// segment delivery, enabling real network transport like `GrpcTransport`.
|
||||
///
|
||||
/// # Panics
|
||||
///
|
||||
/// Panics if any `TidalDb` fails to open or if `start_replication` fails.
|
||||
@ -128,8 +143,7 @@ impl SimulatedCluster {
|
||||
let all_shards: Vec<ShardId> = config.regions.iter().map(|r| ShardId(r.0)).collect();
|
||||
|
||||
let mut nodes: HashMap<RegionId, SimulatedNode> = HashMap::new();
|
||||
let mut follower_senders: HashMap<RegionId, crossbeam::channel::Sender<WalSegmentPayload>> =
|
||||
HashMap::new();
|
||||
let mut follower_transports: HashMap<RegionId, Arc<dyn Transport>> = HashMap::new();
|
||||
let mut leader_seqnos: HashMap<RegionId, u64> = HashMap::new();
|
||||
|
||||
for ®ion in &config.regions {
|
||||
@ -155,22 +169,32 @@ impl SimulatedCluster {
|
||||
|
||||
// Wire a receiver for every non-leader region.
|
||||
if region != config.leader_region {
|
||||
let transport: Arc<dyn Transport> = if let Some(ref ext) = config.transports {
|
||||
// Use externally-provided transport (e.g., GrpcTransport).
|
||||
ext.get(®ion)
|
||||
.unwrap_or_else(|| {
|
||||
panic!("no external transport for follower region {region}")
|
||||
})
|
||||
.clone()
|
||||
} else {
|
||||
// Default: built-in crossbeam channel transport.
|
||||
let (tx, rx) = crossbeam::channel::bounded::<WalSegmentPayload>(1024);
|
||||
let transport = Arc::new(ReceiveOnlyTransport {
|
||||
Arc::new(ChannelTransport {
|
||||
local_shard: shard_id,
|
||||
tx,
|
||||
rx,
|
||||
});
|
||||
// spawn_receiver directly: we already have Arc<ReceiveOnlyTransport>
|
||||
// which implements Transport. Use the replication state from the db.
|
||||
})
|
||||
};
|
||||
|
||||
let ledger = db
|
||||
.ledger()
|
||||
.expect("ephemeral db with schema must have ledger")
|
||||
.clone();
|
||||
let rep_state = db.replication_state().clone();
|
||||
let _handle = spawn_receiver(transport, ledger, rep_state);
|
||||
let _handle = spawn_receiver(transport.clone(), ledger, rep_state);
|
||||
// Note: the JoinHandle is intentionally not stored — the receiver thread
|
||||
// will exit cleanly when `tx` (and all senders to `rx`) are dropped.
|
||||
follower_senders.insert(region, tx);
|
||||
// will exit cleanly when the transport is dropped.
|
||||
follower_transports.insert(region, transport);
|
||||
}
|
||||
|
||||
nodes.insert(
|
||||
@ -186,7 +210,7 @@ impl SimulatedCluster {
|
||||
Self {
|
||||
leader_region: Mutex::new(config.leader_region),
|
||||
nodes,
|
||||
follower_senders,
|
||||
follower_transports,
|
||||
batch_log: Mutex::new(Vec::new()),
|
||||
leader_seqnos: Mutex::new(leader_seqnos),
|
||||
total_signals: AtomicU64::new(0),
|
||||
@ -233,7 +257,7 @@ impl SimulatedCluster {
|
||||
/// Write a signal to the cluster leader and ship it to active followers.
|
||||
///
|
||||
/// The signal is immediately applied to the leader's `TidalDb`. A one-event
|
||||
/// WAL batch is encoded and shipped via the channel transport to all
|
||||
/// WAL batch is encoded and shipped via each follower's transport to all
|
||||
/// non-partitioned followers with active receivers. The batch is also
|
||||
/// recorded in the `batch_log` for partition-recovery re-delivery.
|
||||
///
|
||||
@ -284,14 +308,14 @@ impl SimulatedCluster {
|
||||
let bytes =
|
||||
encode_batch(&events, seqno, ts.as_nanos()).expect("WAL batch encoding must not fail");
|
||||
|
||||
// Ship immediately to non-partitioned followers that have active receivers.
|
||||
// Ship immediately to non-partitioned followers via their transport.
|
||||
let partitioned = self
|
||||
.partitioned_regions
|
||||
.read()
|
||||
.unwrap_or_else(std::sync::PoisonError::into_inner)
|
||||
.clone();
|
||||
|
||||
for (®ion, tx) in &self.follower_senders {
|
||||
for (®ion, transport) in &self.follower_transports {
|
||||
if region == leader_region || partitioned.contains(®ion) {
|
||||
continue;
|
||||
}
|
||||
@ -301,7 +325,7 @@ impl SimulatedCluster {
|
||||
event_count: 1,
|
||||
};
|
||||
// Ignore send errors: the receiver may have exited (e.g. after a crash).
|
||||
let _ = tx.send(payload);
|
||||
let _ = transport.send_segment(ShardId(region.0), payload);
|
||||
}
|
||||
|
||||
// Record in batch_log for partition-recovery re-delivery.
|
||||
@ -383,11 +407,11 @@ impl SimulatedCluster {
|
||||
.batch_log
|
||||
.lock()
|
||||
.unwrap_or_else(std::sync::PoisonError::into_inner);
|
||||
for (&rgn, tx) in &self.follower_senders {
|
||||
for (&rgn, transport) in &self.follower_transports {
|
||||
if rgn == leader_region || partitioned.contains(&rgn) {
|
||||
continue;
|
||||
}
|
||||
redeliver_missed(tx, &self.nodes[&rgn].db, &log);
|
||||
redeliver_missed(transport.as_ref(), &self.nodes[&rgn].db, &log);
|
||||
}
|
||||
}
|
||||
|
||||
@ -398,7 +422,7 @@ impl SimulatedCluster {
|
||||
continue;
|
||||
}
|
||||
// Only check regions that have an active receiver thread.
|
||||
if !self.follower_senders.contains_key(®ion) {
|
||||
if !self.follower_transports.contains_key(®ion) {
|
||||
continue;
|
||||
}
|
||||
let applied = node
|
||||
@ -510,12 +534,12 @@ impl SimulatedCluster {
|
||||
.unwrap_or_else(std::sync::PoisonError::into_inner);
|
||||
partitions.remove(®ion);
|
||||
}
|
||||
if let Some(tx) = self.follower_senders.get(®ion) {
|
||||
if let Some(transport) = self.follower_transports.get(®ion) {
|
||||
let log = self
|
||||
.batch_log
|
||||
.lock()
|
||||
.unwrap_or_else(std::sync::PoisonError::into_inner);
|
||||
redeliver_missed(tx, &self.nodes[®ion].db, &log);
|
||||
redeliver_missed(transport.as_ref(), &self.nodes[®ion].db, &log);
|
||||
}
|
||||
}
|
||||
|
||||
@ -541,9 +565,6 @@ impl SimulatedCluster {
|
||||
/// leader promotion, since each signal produces exactly one WAL batch.
|
||||
#[must_use]
|
||||
pub fn applied_count(&self, region: RegionId) -> u64 {
|
||||
// ShardId(0) is always the initial leader's shard (RegionId(0)).
|
||||
// Tests that check `applied_count` do not involve leader promotion,
|
||||
// so this is always the correct source shard.
|
||||
self.nodes.get(®ion).map_or(0, |n| {
|
||||
n.db.replication_state()
|
||||
.applied_seqno(ShardId(0))
|
||||
|
||||
@ -5,20 +5,22 @@ use crate::replication::WalSegmentId;
|
||||
use crate::replication::shard::{RegionId, ShardId};
|
||||
use crate::replication::transport::{Transport, TransportError, WalSegmentPayload};
|
||||
|
||||
// ── Internal: receive-only transport ─────────────────────────────────────
|
||||
// ── ChannelTransport: bidirectional crossbeam transport ─────────────────
|
||||
|
||||
/// Minimal transport implementation used by follower receivers.
|
||||
/// Bidirectional crossbeam-channel transport for in-process cluster simulation.
|
||||
///
|
||||
/// Owns a crossbeam `Receiver` for incoming WAL segments. The `send_segment`
|
||||
/// side is a no-op — all shipping is managed by the cluster struct.
|
||||
pub(super) struct ReceiveOnlyTransport {
|
||||
/// Wraps both sender and receiver so `SimulatedCluster` can call
|
||||
/// `send_segment` to ship WAL payloads and `spawn_receiver` can call
|
||||
/// `recv_segment` to apply them.
|
||||
pub(super) struct ChannelTransport {
|
||||
pub(super) local_shard: ShardId,
|
||||
pub(super) tx: crossbeam::channel::Sender<WalSegmentPayload>,
|
||||
pub(super) rx: crossbeam::channel::Receiver<WalSegmentPayload>,
|
||||
}
|
||||
|
||||
impl Transport for ReceiveOnlyTransport {
|
||||
fn send_segment(&self, _: ShardId, _: WalSegmentPayload) -> Result<(), TransportError> {
|
||||
Ok(())
|
||||
impl Transport for ChannelTransport {
|
||||
fn send_segment(&self, _to: ShardId, payload: WalSegmentPayload) -> Result<(), TransportError> {
|
||||
self.tx.send(payload).map_err(|_| TransportError::Closed)
|
||||
}
|
||||
|
||||
fn recv_segment(&self) -> Option<WalSegmentPayload> {
|
||||
@ -30,7 +32,7 @@ impl Transport for ReceiveOnlyTransport {
|
||||
}
|
||||
}
|
||||
|
||||
// ── Internal: batch log entry ─────────────────────────────────────────────
|
||||
// ── Batch log entry ──────────────────────────────────────────────────────
|
||||
|
||||
pub(super) struct BatchEntry {
|
||||
/// Which leader shard produced this batch.
|
||||
@ -43,15 +45,12 @@ pub(super) struct BatchEntry {
|
||||
|
||||
// ── Re-delivery helper ────────────────────────────────────────────────────
|
||||
|
||||
/// Re-deliver all batch-log entries not yet applied to `db`, sending through `tx`.
|
||||
/// Re-deliver all batch-log entries not yet applied to `db`, sending through
|
||||
/// the given transport.
|
||||
///
|
||||
/// Called by `SimulatedCluster::heal_region` for immediate recovery after a
|
||||
/// partition is healed, and by `await_convergence` during the polling loop.
|
||||
pub(super) fn redeliver_missed(
|
||||
tx: &crossbeam::channel::Sender<WalSegmentPayload>,
|
||||
db: &TidalDb,
|
||||
log: &[BatchEntry],
|
||||
) {
|
||||
pub(super) fn redeliver_missed(transport: &dyn Transport, db: &TidalDb, log: &[BatchEntry]) {
|
||||
for entry in log {
|
||||
let applied = db
|
||||
.replication_state()
|
||||
@ -63,7 +62,7 @@ pub(super) fn redeliver_missed(
|
||||
bytes: entry.bytes.clone(),
|
||||
event_count: 1,
|
||||
};
|
||||
let _ = tx.try_send(payload);
|
||||
let _ = transport.send_segment(entry.source_shard, payload);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
@ -73,6 +73,7 @@ fn three_region_config() -> ClusterConfig {
|
||||
leader_region: RegionId(0),
|
||||
schema: m8_schema(),
|
||||
profiles: Vec::new(),
|
||||
transports: None,
|
||||
}
|
||||
}
|
||||
|
||||
@ -82,6 +83,7 @@ fn two_region_config() -> ClusterConfig {
|
||||
leader_region: RegionId(0),
|
||||
schema: m8_schema(),
|
||||
profiles: Vec::new(),
|
||||
transports: None,
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user