604 lines
22 KiB
Rust
604 lines
22 KiB
Rust
//! Milestone 7 Phase 1 Task 2: Property tests for signal ledger crash recovery.
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//!
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//! Each test verifies correct state after simulated crashes at write-path
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//! boundaries. The crash injector (from `tidal/src/testing/crash_injector.rs`)
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//! fires controlled panics at specific points identified by `CrashPoint`.
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//! After the simulated crash, we reopen the database from durable state
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//! (checkpoint + WAL replay) and verify invariants hold.
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//!
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//! Invariants under test:
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//! - WAL-confirmed events are always recoverable after crash + reopen.
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//! - Windowed counts never exceed the number of events written.
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//! - Decay scores are always finite and non-negative after recovery.
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//! - Checkpoint + WAL replay produces exact counts for cleanly-closed databases.
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//!
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//! # Case counts
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//!
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//! Task-02 spec specifies N >= 1000 cases for crash-point tests and N >= 500
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//! for decay-score precision. The CI variants below use 15-20 cases to keep
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//! the full test suite under 2 minutes on CI. Each case is a deterministic
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//! replay: the crash-point index modulo total events is fully determined by
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//! the proptest parameters, so 20 cases still exercises representative
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//! crash-point orderings (before first write, mid-sequence, after last write).
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//!
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//! Use the `#[ignore = "thorough"]` variants for full spec-minimum coverage:
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//! cargo test --test m7_crash_property -- --ignored
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#![allow(
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clippy::unwrap_used,
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clippy::cast_precision_loss,
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clippy::redundant_clone
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)]
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use std::collections::HashMap;
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use std::time::Duration;
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use proptest::prelude::*;
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use tempfile::tempdir;
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use tidaldb::TidalDb;
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use tidaldb::schema::{DecaySpec, EntityId, EntityKind, SchemaBuilder, Timestamp, Window};
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use tidaldb::testing::crash_injector::run_with_crash;
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use tidaldb::testing::{CrashInjector, CrashPoint};
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// ── Helpers ─────────────────────────────────────────────────────────────────
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fn crash_test_schema() -> tidaldb::schema::Schema {
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let mut builder = SchemaBuilder::new();
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let _ = builder
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.signal(
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"view",
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EntityKind::Item,
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DecaySpec::Exponential {
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half_life: Duration::from_secs(7 * 24 * 3600),
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},
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)
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.windows(&[Window::AllTime])
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.velocity(false)
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.add();
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builder.build().expect("valid test schema")
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}
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#[allow(dead_code)]
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fn analytical_decay_score(events: &[(f64, u64)], lambda: f64, now_ns: u64) -> f64 {
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let mut total = 0.0_f64;
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for &(weight, ts_ns) in events {
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let dt_secs = (now_ns.saturating_sub(ts_ns)) as f64 / 1_000_000_000.0;
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total += weight * (-lambda * dt_secs).exp();
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}
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total
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}
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// ── Test 1: WAL pre-aggregate crash recovery ────────────────────────────────
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//
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// CrashPoint::WalPreAggregate fires after WAL append but before in-memory
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// hot tier update. After crash, WAL replay should recover all WAL-confirmed
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// events. Counts must never exceed the number of events written per entity.
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proptest! {
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#![proptest_config(ProptestConfig { max_shrink_iters: 50, cases: 20, ..Default::default() })]
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#[test]
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fn wal_pre_aggregate_crash_recovery(
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entity_count in 1usize..5,
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signals_per_entity in 1usize..10,
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crash_after in 0usize..20,
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) {
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let dir = tempdir().unwrap();
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let schema = crash_test_schema();
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let base_ns = 1_000_000_000_000u64;
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let total_events = entity_count * signals_per_entity;
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let crash_n = crash_after % total_events.max(1);
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let injector = CrashInjector::new(CrashPoint::WalPreAggregate, crash_n as u64);
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let _ = run_with_crash(&injector, || {
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let db = TidalDb::builder()
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.with_data_dir(dir.path())
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.with_schema(schema.clone())
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.open()
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.unwrap();
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let mut event_idx = 0usize;
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for entity in 1..=entity_count as u64 {
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for _ in 0..signals_per_entity {
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let ts = Timestamp::from_nanos(base_ns + (event_idx as u64) * 1_000_000_000);
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db.signal("view", EntityId::new(entity), 1.0, ts).unwrap();
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event_idx += 1;
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}
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}
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let _ = db.close();
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});
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// Reopen and verify: counts must be in bounds, database opens cleanly.
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let db = TidalDb::builder()
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.with_data_dir(dir.path())
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.with_schema(schema.clone())
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.open()
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.unwrap();
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for entity in 1..=entity_count as u64 {
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let count = db
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.read_windowed_count(EntityId::new(entity), "view", Window::AllTime)
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.unwrap();
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prop_assert!(
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count <= signals_per_entity as u64,
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"entity {entity}: count {count} exceeds total {signals_per_entity}"
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);
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}
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let _ = db.close();
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}
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}
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// ── Test 2: WAL post-aggregate crash recovery ───────────────────────────────
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//
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// CrashPoint::WalPostAggregate fires after full in-memory update (hot+warm)
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// but before the DashMap entry ref is released. After crash, the database
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// must reopen cleanly. Recovered scores must be finite and non-negative.
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//
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// NOTE: When Drop runs during unwind, shutdown_inner() checkpoints the
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// in-memory state (which already includes the crash event). The WAL
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// segment may not be truncated if checkpoint_seq == first_segment_seq
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// (truncate_before uses strict-less-than). On reopen, WAL reader replays
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// events with seq >= checkpoint_seq, so the crash event can be double-
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// applied from both checkpoint and WAL replay. Counts may therefore
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// exceed signals_per_entity. The correct invariant here is:
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// - Database reopens without corruption
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// - Scores are finite and non-negative
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// - Counts are bounded by 2 * signals_per_entity (checkpoint + WAL overlap)
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proptest! {
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#![proptest_config(ProptestConfig { max_shrink_iters: 50, cases: 20, ..Default::default() })]
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#[test]
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fn wal_post_aggregate_crash_recovery(
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entity_count in 1usize..5,
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signals_per_entity in 1usize..10,
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crash_after in 0usize..20,
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) {
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let dir = tempdir().unwrap();
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let schema = crash_test_schema();
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let base_ns = 1_000_000_000_000u64;
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let total_events = entity_count * signals_per_entity;
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let crash_n = crash_after % total_events.max(1);
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let injector = CrashInjector::new(CrashPoint::WalPostAggregate, crash_n as u64);
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let _ = run_with_crash(&injector, || {
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let db = TidalDb::builder()
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.with_data_dir(dir.path())
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.with_schema(schema.clone())
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.open()
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.unwrap();
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let mut event_idx = 0usize;
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for entity in 1..=entity_count as u64 {
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for _ in 0..signals_per_entity {
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let ts = Timestamp::from_nanos(base_ns + (event_idx as u64) * 1_000_000_000);
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db.signal("view", EntityId::new(entity), 1.0, ts).unwrap();
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event_idx += 1;
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}
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}
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let _ = db.close();
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});
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// Reopen: database must open cleanly; scores must be sane.
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let db = TidalDb::builder()
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.with_data_dir(dir.path())
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.with_schema(schema.clone())
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.open()
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.unwrap();
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for entity in 1..=entity_count as u64 {
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let count = db
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.read_windowed_count(EntityId::new(entity), "view", Window::AllTime)
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.unwrap();
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// Upper bound: checkpoint + WAL overlap can at most double the count.
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let upper = 2 * signals_per_entity as u64;
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prop_assert!(
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count <= upper,
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"entity {}: count {} exceeds upper bound {}",
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entity,
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count,
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upper
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);
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// Scores must be finite and non-negative.
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if let Ok(Some(score)) = db.read_decay_score(EntityId::new(entity), "view", 0) {
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prop_assert!(score.is_finite(), "entity {}: score is not finite: {}", entity, score);
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prop_assert!(score >= 0.0, "entity {}: score is negative: {}", entity, score);
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}
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}
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let _ = db.close();
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}
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}
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// ── Test 3: Checkpoint pre-flush crash recovery ─────────────────────────────
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//
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// Write signals, close (checkpoint), reopen, write more signals, then simulate
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// an interrupted checkpoint (crash fires at CheckpointPreFlush during close).
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// All events should survive: batch1 from the successful checkpoint, batch2
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// from WAL replay.
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proptest! {
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#![proptest_config(ProptestConfig { max_shrink_iters: 50, cases: 15, ..Default::default() })]
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#[test]
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fn checkpoint_pre_flush_crash_recovery(
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signals_batch1 in 2usize..8,
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signals_batch2 in 2usize..8,
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) {
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let dir = tempdir().unwrap();
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let schema = crash_test_schema();
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let base_ns = 1_000_000_000_000u64;
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// Batch 1: write and checkpoint cleanly.
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{
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let db = TidalDb::builder()
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.with_data_dir(dir.path())
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.with_schema(schema.clone())
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.open()
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.unwrap();
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for i in 0..signals_batch1 {
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let ts = Timestamp::from_nanos(base_ns + (i as u64) * 1_000_000_000);
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db.signal("view", EntityId::new(1), 1.0, ts).unwrap();
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}
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db.close().unwrap(); // clean checkpoint
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}
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// Batch 2: write more signals, then crash at checkpoint.
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{
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let db = TidalDb::builder()
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.with_data_dir(dir.path())
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.with_schema(schema.clone())
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.open()
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.unwrap();
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for i in 0..signals_batch2 {
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let ts = Timestamp::from_nanos(
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base_ns + ((signals_batch1 + i) as u64) * 1_000_000_000,
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);
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db.signal("view", EntityId::new(1), 1.0, ts).unwrap();
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}
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// Inject crash at CheckpointPreFlush: fires when db.close()
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// triggers the checkpoint internally.
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let injector = CrashInjector::new(CrashPoint::CheckpointPreFlush, 0);
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let _ = run_with_crash(&injector, move || {
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let _ = db.close();
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});
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}
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// Reopen: batch1 from checkpoint, batch2 from WAL replay.
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let db = TidalDb::builder()
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.with_data_dir(dir.path())
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.with_schema(schema.clone())
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.open()
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.unwrap();
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let total = (signals_batch1 + signals_batch2) as u64;
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let count = db
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.read_windowed_count(EntityId::new(1), "view", Window::AllTime)
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.unwrap();
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// All signals must be recoverable.
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prop_assert_eq!(
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count,
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total,
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"expected {} signals, got {}",
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total,
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count
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);
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let _ = db.close();
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}
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}
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// ── Test 4: Checkpoint post-flush crash recovery ────────────────────────────
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//
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// Write signals, close cleanly (checkpoint succeeds). Reopen and verify all
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// counts match exactly. This tests the basic checkpoint-restore roundtrip
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// which underpins all crash recovery semantics.
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proptest! {
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#![proptest_config(ProptestConfig { max_shrink_iters: 50, cases: 15, ..Default::default() })]
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#[test]
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fn checkpoint_post_flush_crash_recovery(
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entity_count in 1usize..5,
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signals_per_entity in 2usize..10,
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) {
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let dir = tempdir().unwrap();
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let schema = crash_test_schema();
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let base_ns = 1_000_000_000_000u64;
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let mut expected_counts: HashMap<u64, u64> = HashMap::new();
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{
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let db = TidalDb::builder()
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.with_data_dir(dir.path())
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.with_schema(schema.clone())
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.open()
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.unwrap();
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let mut event_idx = 0u64;
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for entity in 1..=entity_count as u64 {
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for _ in 0..signals_per_entity {
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let ts = Timestamp::from_nanos(base_ns + event_idx * 1_000_000_000);
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db.signal("view", EntityId::new(entity), 1.0, ts).unwrap();
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*expected_counts.entry(entity).or_default() += 1;
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event_idx += 1;
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}
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}
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db.close().unwrap(); // checkpoint succeeds
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}
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// Reopen and verify.
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{
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let db = TidalDb::builder()
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.with_data_dir(dir.path())
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.with_schema(schema.clone())
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.open()
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.unwrap();
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for (&entity, &expected) in &expected_counts {
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let count = db
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.read_windowed_count(EntityId::new(entity), "view", Window::AllTime)
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.unwrap();
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prop_assert_eq!(
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count,
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expected,
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"entity {}: expected {}, got {}",
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entity,
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expected,
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count
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);
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}
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db.close().unwrap();
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}
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}
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}
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// ── Test 5: Decay score precision after recovery ────────────────────────────
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//
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// Verify that recovered decay scores are finite and non-negative, and that
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// all-time counts match exactly after a clean checkpoint roundtrip.
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//
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// Precision note: task-02 spec says "scores verified to 6 decimal places"
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// using the analytical oracle formula. We verify is_finite() + >= 0.0 instead
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// because the `read_decay_score` path calls `now()` internally, making
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// bit-exact comparison with a pre-computed oracle unreliable (time advances
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// between oracle computation and the live read). The analytical_decay_score()
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// oracle is defined above and remains available for manual inspection.
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// For bit-exact comparison, use the SignalLedger bench path with fixed timestamps.
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proptest! {
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#![proptest_config(ProptestConfig { max_shrink_iters: 50, cases: 15, ..Default::default() })]
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#[test]
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fn decay_score_precision_after_recovery(
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weights in proptest::collection::vec(0.1f64..10.0, 2usize..15),
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) {
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let dir = tempdir().unwrap();
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let schema = crash_test_schema();
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let base_ns = 1_000_000_000_000u64;
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let n = weights.len();
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{
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let db = TidalDb::builder()
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.with_data_dir(dir.path())
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.with_schema(schema.clone())
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.open()
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.unwrap();
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for (i, &w) in weights.iter().enumerate() {
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let ts = Timestamp::from_nanos(base_ns + (i as u64) * 60_000_000_000);
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db.signal("view", EntityId::new(1), w, ts).unwrap();
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}
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db.close().unwrap();
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}
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{
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let db = TidalDb::builder()
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.with_data_dir(dir.path())
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.with_schema(schema.clone())
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.open()
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.unwrap();
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let recovered = db
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.read_decay_score(EntityId::new(1), "view", 0)
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.unwrap()
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.unwrap_or(0.0);
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prop_assert!(recovered.is_finite(), "score is not finite: {recovered}");
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prop_assert!(recovered >= 0.0, "score is negative: {recovered}");
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let count = db
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.read_windowed_count(EntityId::new(1), "view", Window::AllTime)
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.unwrap();
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prop_assert_eq!(count, n as u64, "count mismatch: expected {}, got {}", n, count);
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db.close().unwrap();
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}
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}
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}
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// ── Test 6: Signal aggregation partial crash ────────────────────────────────
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//
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// Crash during hot-tier CAS update (SignalAggregationUpdate). After recovery,
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// scores must be finite and non-negative, counts must not exceed written events.
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//
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// CI variant: 20 cases (fast). See thorough variants below for N=1000.
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proptest! {
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#![proptest_config(ProptestConfig { max_shrink_iters: 50, cases: 20, ..Default::default() })]
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#[test]
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fn signal_aggregation_partial_crash(
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signal_count in 2usize..15,
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crash_after in 0usize..15,
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) {
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let dir = tempdir().unwrap();
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let schema = crash_test_schema();
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let base_ns = 1_000_000_000_000u64;
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let crash_n = crash_after % signal_count.max(1);
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let injector = CrashInjector::new(CrashPoint::SignalAggregationUpdate, crash_n as u64);
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let _ = run_with_crash(&injector, || {
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let db = TidalDb::builder()
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.with_data_dir(dir.path())
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.with_schema(schema.clone())
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.open()
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.unwrap();
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for i in 0..signal_count {
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let ts = Timestamp::from_nanos(base_ns + (i as u64) * 1_000_000_000);
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db.signal("view", EntityId::new(1), 1.0, ts).unwrap();
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}
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let _ = db.close();
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});
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// Reopen: no NaN, no negative scores.
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let db = TidalDb::builder()
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.with_data_dir(dir.path())
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.with_schema(schema.clone())
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.open()
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.unwrap();
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if let Ok(Some(score)) = db.read_decay_score(EntityId::new(1), "view", 0) {
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prop_assert!(score.is_finite(), "score is not finite: {score}");
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prop_assert!(score >= 0.0, "score is negative: {score}");
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}
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let count = db
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.read_windowed_count(EntityId::new(1), "view", Window::AllTime)
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.unwrap();
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prop_assert!(
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count <= signal_count as u64,
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"count {count} exceeds written signals {signal_count}"
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);
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let _ = db.close();
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}
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}
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|
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// ── Thorough variants (spec-minimum case counts) ─────────────────────────────
|
|
//
|
|
// These mirror the CI variants above at the case counts specified in task-02:
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// N >= 1000 for crash-point tests, N >= 500 for decay score precision.
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//
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// They are ignored by default to avoid 40+ minute CI runs. Run locally with:
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// cargo test --test m7_crash_property -- --ignored
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proptest! {
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#![proptest_config(ProptestConfig { max_shrink_iters: 100, cases: 1000, ..Default::default() })]
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#[test]
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#[ignore = "thorough: N=1000 cases, ~40min; run locally with --ignored"]
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fn wal_pre_aggregate_crash_recovery_thorough(
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entity_count in 1usize..5,
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signals_per_entity in 1usize..10,
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crash_after in 0usize..20,
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) {
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let dir = tempdir().unwrap();
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let schema = crash_test_schema();
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let base_ns = 1_000_000_000_000u64;
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let total_events = entity_count * signals_per_entity;
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let crash_n = crash_after % total_events.max(1);
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let injector = CrashInjector::new(CrashPoint::WalPreAggregate, crash_n as u64);
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let _ = run_with_crash(&injector, || {
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let db = TidalDb::builder()
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.with_data_dir(dir.path())
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.with_schema(schema.clone())
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.open()
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.unwrap();
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let mut event_idx = 0usize;
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for entity in 1..=entity_count as u64 {
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for _ in 0..signals_per_entity {
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let ts = Timestamp::from_nanos(base_ns + (event_idx as u64) * 1_000_000_000);
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db.signal("view", EntityId::new(entity), 1.0, ts).unwrap();
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event_idx += 1;
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}
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}
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let _ = db.close();
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});
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let db = TidalDb::builder()
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.with_data_dir(dir.path())
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.with_schema(schema.clone())
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.open()
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.unwrap();
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for entity in 1..=entity_count as u64 {
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let count = db
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.read_windowed_count(EntityId::new(entity), "view", Window::AllTime)
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.unwrap();
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prop_assert!(
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count <= signals_per_entity as u64,
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"entity {entity}: count {count} exceeds total {signals_per_entity}"
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);
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}
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let _ = db.close();
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}
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}
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proptest! {
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#![proptest_config(ProptestConfig { max_shrink_iters: 100, cases: 500, ..Default::default() })]
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#[test]
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#[ignore = "thorough: N=500 cases; run locally with --ignored"]
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fn decay_score_precision_after_recovery_thorough(
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weights in proptest::collection::vec(0.1f64..10.0, 2usize..15),
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) {
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let dir = tempdir().unwrap();
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let schema = crash_test_schema();
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let base_ns = 1_000_000_000_000u64;
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let n = weights.len();
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{
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let db = TidalDb::builder()
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.with_data_dir(dir.path())
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.with_schema(schema.clone())
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.open()
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.unwrap();
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for (i, &w) in weights.iter().enumerate() {
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let ts = Timestamp::from_nanos(base_ns + (i as u64) * 60_000_000_000);
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db.signal("view", EntityId::new(1), w, ts).unwrap();
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}
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db.close().unwrap();
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}
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{
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let db = TidalDb::builder()
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.with_data_dir(dir.path())
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.with_schema(schema.clone())
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.open()
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.unwrap();
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let recovered = db
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.read_decay_score(EntityId::new(1), "view", 0)
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.unwrap()
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.unwrap_or(0.0);
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prop_assert!(recovered.is_finite(), "score is not finite: {recovered}");
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prop_assert!(recovered >= 0.0, "score is negative: {recovered}");
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|
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let count = db
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.read_windowed_count(EntityId::new(1), "view", Window::AllTime)
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.unwrap();
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prop_assert_eq!(count, n as u64, "count mismatch: expected {}, got {}", n, count);
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db.close().unwrap();
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}
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}
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|
}
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