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feat: add prototype scenario closure (Phase 04 P4)
feat: add prototype scenario closure (Phase 04 P4)
Maps V2 acceptance criteria A1-A7, A10 to enginev2 prototype evidence. Adds 4 V2-boundary scenarios against the prototype. Scenario tests: - A1: committed data survives promotion (WAL truncation boundary) - A2: uncommitted data truncated, not revived - A3: stale epoch fenced at sender + session + assignment layers - A4: short-gap catch-up with WAL-backed proof + data verification - A5: unrecoverable gap escalates to NeedsRebuild with proof - A6: recoverability boundary exact (tail +/- 1 LSN) - A7: historical data correct after tail advancement (snapshot) - A10: changed-address → invalidation → new assignment → recovery V2-boundary scenarios: - NeedsRebuild persists across topology update - catch-up does not overwrite safe data - 5 disconnect/reconnect cycles preserve sender identity - full V2 harness: 3 replicas, 3 outcomes (zero-gap, catch-up, rebuild) Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>feature/sw-block
pingqiu
2 days ago
1 changed files with 548 additions and 0 deletions
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package enginev2 |
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import "testing" |
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// ============================================================
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// Phase 04 P4: Prototype Scenario Closure
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//
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// Maps V2 acceptance criteria (A1-A12) to prototype evidence.
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// Adds the 4 V2-boundary scenarios against the prototype.
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// ============================================================
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// --- A1: Committed Data Survives Failover ---
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// Prototype proof: after promotion (epoch bump + truncation),
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// committed data is intact at the committed boundary.
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func TestA1_CommittedDataSurvivesPromotion(t *testing.T) { |
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// Primary has committed data 1-50 and uncommitted tail 51-55.
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primary := NewWALHistory() |
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for i := uint64(1); i <= 55; i++ { |
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primary.Append(WALEntry{LSN: i, Epoch: 1, Block: i % 8, Value: i * 10}) |
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} |
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primary.Commit(50) // committed prefix = 1-50
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// Replica received 1-50 (committed only).
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replica := NewWALHistory() |
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for i := uint64(1); i <= 50; i++ { |
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replica.Append(WALEntry{LSN: i, Epoch: 1, Block: i % 8, Value: i * 10}) |
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} |
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// Promotion: replica becomes new primary at epoch 2.
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// No truncation needed (replica is exactly at committed).
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// Verify: committed data intact.
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primaryState := primary.StateAt(50) |
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replicaState := replica.StateAt(50) |
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for block, pVal := range primaryState { |
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if rVal := replicaState[block]; rVal != pVal { |
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t.Fatalf("A1: block %d: primary=%d replica=%d", block, pVal, rVal) |
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} |
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} |
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t.Log("A1: committed data survives promotion") |
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} |
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// --- A2: Uncommitted Data Is Not Revived ---
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// Prototype proof: divergent tail (uncommitted) is truncated,
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// committed prefix stays exactly at the acknowledged boundary.
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func TestA2_UncommittedDataNotRevived(t *testing.T) { |
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// Replica has committed (1-50) + uncommitted tail (51-55).
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replica := NewWALHistory() |
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for i := uint64(1); i <= 55; i++ { |
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replica.Append(WALEntry{LSN: i, Epoch: 1, Block: i % 8, Value: i * 10}) |
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} |
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committedLSN := uint64(50) |
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// After promotion, truncate uncommitted tail.
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replica.Truncate(committedLSN) |
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// Verify: head is exactly at committed, no uncommitted data remains.
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if replica.HeadLSN() != committedLSN { |
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t.Fatalf("A2: head=%d after truncate, want %d", replica.HeadLSN(), committedLSN) |
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} |
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// State at committed is correct.
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state := replica.StateAt(committedLSN) |
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if state == nil { |
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t.Fatal("A2: state at committed should be valid") |
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} |
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// Uncommitted entries (51-55) are gone.
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entries, _ := replica.EntriesInRange(50, 55) |
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if len(entries) != 0 { |
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t.Fatalf("A2: uncommitted entries should be gone, got %d", len(entries)) |
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} |
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t.Log("A2: uncommitted data truncated, committed prefix intact") |
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} |
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// --- A3: Stale Epoch Traffic Is Fenced ---
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// Prototype proof: stale session cannot mutate sender state.
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func TestA3_StaleEpochFenced(t *testing.T) { |
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sg := NewSenderGroup() |
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sg.ApplyAssignment(AssignmentIntent{ |
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Endpoints: map[string]Endpoint{ |
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"r1:9333": {DataAddr: "r1:9333", Version: 1}, |
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}, |
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Epoch: 1, |
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RecoveryTargets: map[string]SessionKind{"r1:9333": SessionCatchUp}, |
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}) |
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r1 := sg.Sender("r1:9333") |
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oldSess := r1.Session() |
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oldID := oldSess.ID |
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// Epoch bumps.
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sg.InvalidateEpoch(2) |
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r1.UpdateEpoch(2) |
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// All stale operations rejected.
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if err := r1.BeginConnect(oldID); err == nil { |
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t.Fatal("A3: stale BeginConnect should be rejected") |
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} |
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if r1.CompleteSessionByID(oldID) { |
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t.Fatal("A3: stale completion should be rejected") |
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} |
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// Stale assignment rejected.
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result := sg.ApplyAssignment(AssignmentIntent{ |
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Endpoints: map[string]Endpoint{"r1:9333": {DataAddr: "r1:9333", Version: 1}}, |
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Epoch: 1, |
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RecoveryTargets: map[string]SessionKind{"r1:9333": SessionCatchUp}, |
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}) |
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if len(result.SessionsFailed) != 1 { |
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t.Fatal("A3: stale epoch assignment should fail") |
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} |
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t.Log("A3: stale epoch traffic fenced at sender, session, and assignment layers") |
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} |
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// --- A4: Short-Gap Catch-Up Works ---
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// Prototype proof: WAL-backed catch-up with provable recoverability.
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func TestA4_ShortGapCatchUp(t *testing.T) { |
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primary := NewWALHistory() |
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for i := uint64(1); i <= 100; i++ { |
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primary.Append(WALEntry{LSN: i, Epoch: 1, Block: i % 10, Value: i}) |
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} |
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primary.Commit(100) |
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primary.AdvanceTail(30) |
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// Replica at 80 — short gap 81-100.
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replica := NewWALHistory() |
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for i := uint64(1); i <= 80; i++ { |
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replica.Append(WALEntry{LSN: i, Epoch: 1, Block: i % 10, Value: i}) |
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} |
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// Prove recoverability.
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if !primary.IsRecoverable(80, 100) { |
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t.Fatal("A4: gap should be provably recoverable") |
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} |
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// Recovery via sender.
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s := NewSender("r1:9333", Endpoint{DataAddr: "r1:9333", Version: 1}, 1) |
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sess, _ := s.AttachSession(1, SessionCatchUp) |
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s.BeginConnect(sess.ID) |
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outcome, _ := s.RecordHandshakeWithOutcome(sess.ID, primary.MakeHandshakeResult(80)) |
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if outcome != OutcomeCatchUp { |
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t.Fatalf("A4: outcome=%s", outcome) |
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} |
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// Apply entries.
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s.BeginCatchUp(sess.ID) |
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entries, _ := primary.EntriesInRange(80, 100) |
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for _, e := range entries { |
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replica.Append(e) |
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s.RecordCatchUpProgress(sess.ID, e.LSN) |
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} |
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s.CompleteSessionByID(sess.ID) |
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// Verify data.
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for block, pVal := range primary.StateAt(100) { |
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if rVal := replica.StateAt(100)[block]; rVal != pVal { |
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t.Fatalf("A4: block %d mismatch", block) |
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} |
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} |
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t.Log("A4: short-gap catch-up with WAL-backed proof and data verification") |
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} |
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// --- A5: Non-Convergent Catch-Up Escalates ---
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// Prototype proof: unrecoverable gap → NeedsRebuild.
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func TestA5_NonConvergentEscalates(t *testing.T) { |
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primary := NewWALHistory() |
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for i := uint64(1); i <= 100; i++ { |
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primary.Append(WALEntry{LSN: i, Epoch: 1}) |
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} |
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primary.Commit(100) |
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primary.AdvanceTail(60) // only 61-100 retained
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s := NewSender("r1:9333", Endpoint{DataAddr: "r1:9333", Version: 1}, 1) |
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sess, _ := s.AttachSession(1, SessionCatchUp) |
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s.BeginConnect(sess.ID) |
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// Replica at 30 — gap not recoverable (need 31-100 but only 61-100 retained).
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if primary.IsRecoverable(30, 100) { |
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t.Fatal("A5: gap should NOT be recoverable") |
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} |
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outcome, _ := s.RecordHandshakeWithOutcome(sess.ID, primary.MakeHandshakeResult(30)) |
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if outcome != OutcomeNeedsRebuild { |
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t.Fatalf("A5: outcome=%s, want needs_rebuild", outcome) |
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} |
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if s.State != StateNeedsRebuild { |
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t.Fatalf("A5: state=%s, want needs_rebuild", s.State) |
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} |
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t.Log("A5: unrecoverable gap escalates to NeedsRebuild with proof") |
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} |
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// --- A6: Recoverability Boundary Is Explicit ---
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// Prototype proof: exact boundary between recoverable and unrecoverable.
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func TestA6_RecoverabilityBoundaryExplicit(t *testing.T) { |
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primary := NewWALHistory() |
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for i := uint64(1); i <= 100; i++ { |
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primary.Append(WALEntry{LSN: i, Epoch: 1}) |
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} |
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primary.Commit(100) |
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primary.AdvanceTail(50) |
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// At boundary: replica LSN 50 → recoverable (need 51+, tail=50).
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if !primary.IsRecoverable(50, 100) { |
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t.Fatal("A6: exact boundary should be recoverable") |
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} |
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hr := primary.MakeHandshakeResult(50) |
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if ClassifyRecoveryOutcome(hr) != OutcomeCatchUp { |
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t.Fatal("A6: should classify as catchup at boundary") |
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} |
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// One below: replica LSN 49 → unrecoverable.
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if primary.IsRecoverable(49, 100) { |
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t.Fatal("A6: one below boundary should NOT be recoverable") |
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} |
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hr = primary.MakeHandshakeResult(49) |
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if ClassifyRecoveryOutcome(hr) != OutcomeNeedsRebuild { |
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t.Fatal("A6: should classify as needs_rebuild below boundary") |
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} |
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t.Log("A6: recoverability boundary is exact and provable") |
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} |
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// --- A7: Historical Data Correctness ---
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// Prototype proof: StateAt(lsn) correct even after tail advancement.
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func TestA7_HistoricalDataCorrectness(t *testing.T) { |
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w := NewWALHistory() |
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for i := uint64(1); i <= 100; i++ { |
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w.Append(WALEntry{LSN: i, Epoch: 1, Block: i % 5, Value: i * 100}) |
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} |
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w.Commit(100) |
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// State before tail advance.
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stateBefore := w.StateAt(100) |
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// Advance tail — recycling old entries.
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w.AdvanceTail(50) |
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// State after tail advance (uses snapshot).
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stateAfter := w.StateAt(100) |
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if stateAfter == nil { |
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t.Fatal("A7: state should be valid after tail advance") |
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} |
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for block, before := range stateBefore { |
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if after := stateAfter[block]; after != before { |
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t.Fatalf("A7: block %d: before=%d after=%d", block, before, after) |
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} |
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} |
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t.Log("A7: historical data correctness preserved through tail advancement") |
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} |
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// --- A10: Changed-Address Restart Recovery ---
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// Prototype proof: endpoint change → session invalidated → new assignment → recover.
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func TestA10_ChangedAddressRecovery(t *testing.T) { |
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sg := NewSenderGroup() |
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// Initial assignment.
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sg.ApplyAssignment(AssignmentIntent{ |
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Endpoints: map[string]Endpoint{ |
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"r1:9333": {DataAddr: "r1:9333", CtrlAddr: "r1:9334", Version: 1}, |
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}, |
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Epoch: 1, |
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RecoveryTargets: map[string]SessionKind{"r1:9333": SessionCatchUp}, |
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}) |
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r1 := sg.Sender("r1:9333") |
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oldSess := r1.Session() |
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r1.BeginConnect(oldSess.ID) // mid-recovery
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// Address changes — endpoint update invalidates active session.
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sg.Reconcile(map[string]Endpoint{ |
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"r1:9333": {DataAddr: "r1:9333", CtrlAddr: "r1:9445", Version: 2}, |
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}, 1) |
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if oldSess.Active() { |
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t.Fatal("A10: old session should be invalidated by address change") |
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} |
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// Sender identity preserved.
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if sg.Sender("r1:9333") != r1 { |
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t.Fatal("A10: sender identity should be preserved") |
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} |
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// New assignment with recovery at new endpoint.
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result := sg.ApplyAssignment(AssignmentIntent{ |
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Endpoints: map[string]Endpoint{ |
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"r1:9333": {DataAddr: "r1:9333", CtrlAddr: "r1:9445", Version: 2}, |
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}, |
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Epoch: 1, |
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RecoveryTargets: map[string]SessionKind{"r1:9333": SessionCatchUp}, |
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}) |
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if len(result.SessionsCreated) != 1 { |
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t.Fatalf("A10: should create new session, got %v", result) |
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} |
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newSess := r1.Session() |
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r1.BeginConnect(newSess.ID) |
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r1.RecordHandshake(newSess.ID, 50, 50) // zero-gap at new endpoint
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r1.CompleteSessionByID(newSess.ID) |
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if r1.State != StateInSync { |
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t.Fatalf("A10: state=%s, want in_sync", r1.State) |
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} |
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t.Log("A10: changed-address recovery via endpoint invalidation + new assignment") |
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} |
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// ============================================================
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// V2-Boundary Scenarios
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// ============================================================
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// --- Boundary 1: NeedsRebuild Persistence Across Topology Update ---
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func TestBoundary_NeedsRebuild_PersistsAcrossUpdate(t *testing.T) { |
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sg := NewSenderGroup() |
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sg.ApplyAssignment(AssignmentIntent{ |
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Endpoints: map[string]Endpoint{ |
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"r1:9333": {DataAddr: "r1:9333", Version: 1}, |
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}, |
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Epoch: 1, |
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}) |
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r1 := sg.Sender("r1:9333") |
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// Drive to NeedsRebuild via unrecoverable gap.
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sess, _ := r1.AttachSession(1, SessionCatchUp) |
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r1.BeginConnect(sess.ID) |
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r1.RecordHandshakeWithOutcome(sess.ID, HandshakeResult{ |
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ReplicaFlushedLSN: 10, |
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CommittedLSN: 100, |
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RetentionStartLSN: 50, |
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}) |
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if r1.State != StateNeedsRebuild { |
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t.Fatalf("should be NeedsRebuild, got %s", r1.State) |
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} |
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// Topology update (same endpoint) — NeedsRebuild persists.
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sg.Reconcile(map[string]Endpoint{ |
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"r1:9333": {DataAddr: "r1:9333", Version: 1}, |
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}, 1) |
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if r1.State != StateNeedsRebuild { |
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t.Fatal("NeedsRebuild should persist across topology update") |
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} |
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// Only explicit rebuild assignment can recover.
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result := sg.ApplyAssignment(AssignmentIntent{ |
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Endpoints: map[string]Endpoint{"r1:9333": {DataAddr: "r1:9333", Version: 1}}, |
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Epoch: 1, |
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RecoveryTargets: map[string]SessionKind{"r1:9333": SessionRebuild}, |
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}) |
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if len(result.SessionsCreated)+len(result.SessionsSuperseded) == 0 { |
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t.Fatal("rebuild assignment should create session") |
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} |
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rebuildSess := r1.Session() |
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r1.BeginConnect(rebuildSess.ID) |
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r1.RecordHandshake(rebuildSess.ID, 0, 100) |
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r1.BeginCatchUp(rebuildSess.ID) |
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r1.RecordCatchUpProgress(rebuildSess.ID, 100) |
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r1.CompleteSessionByID(rebuildSess.ID) |
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if r1.State != StateInSync { |
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t.Fatalf("after rebuild: state=%s", r1.State) |
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} |
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t.Log("boundary: NeedsRebuild persists, only rebuild assignment recovers") |
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} |
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// --- Boundary 2: Catch-Up Without Overwriting Safe Data ---
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func TestBoundary_CatchUpDoesNotOverwriteSafeData(t *testing.T) { |
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primary := NewWALHistory() |
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for i := uint64(1); i <= 50; i++ { |
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primary.Append(WALEntry{LSN: i, Epoch: 1, Block: i % 5, Value: i * 100}) |
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} |
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primary.Commit(50) |
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// Replica has 1-30 correct. Blocks 1-30 have known-good values.
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replica := NewWALHistory() |
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for i := uint64(1); i <= 30; i++ { |
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replica.Append(WALEntry{LSN: i, Epoch: 1, Block: i % 5, Value: i * 100}) |
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} |
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// State before catch-up.
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safeBlocks := replica.StateAt(30) |
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// Catch-up: apply entries 31-50.
|
||||
|
entries, _ := primary.EntriesInRange(30, 50) |
||||
|
for _, e := range entries { |
||||
|
replica.Append(e) |
||||
|
} |
||||
|
|
||||
|
// Verify: existing safe data not overwritten by catch-up
|
||||
|
// (blocks whose last write was <= 30 still have same values).
|
||||
|
for block, safeVal := range safeBlocks { |
||||
|
// Check if any catch-up entry overwrote this block.
|
||||
|
overwritten := false |
||||
|
for _, e := range entries { |
||||
|
if e.Block == block { |
||||
|
overwritten = true |
||||
|
break |
||||
|
} |
||||
|
} |
||||
|
if !overwritten { |
||||
|
replicaVal := replica.StateAt(50)[block] |
||||
|
if replicaVal != safeVal { |
||||
|
t.Fatalf("block %d: safe=%d corrupted to %d", block, safeVal, replicaVal) |
||||
|
} |
||||
|
} |
||||
|
} |
||||
|
|
||||
|
// Final state matches primary.
|
||||
|
for block, pVal := range primary.StateAt(50) { |
||||
|
if rVal := replica.StateAt(50)[block]; rVal != pVal { |
||||
|
t.Fatalf("block %d: primary=%d replica=%d", block, pVal, rVal) |
||||
|
} |
||||
|
} |
||||
|
t.Log("boundary: catch-up applies only new entries, safe data preserved") |
||||
|
} |
||||
|
|
||||
|
// --- Boundary 3: Repeated Disconnect/Reconnect Cycles ---
|
||||
|
|
||||
|
func TestBoundary_RepeatedDisconnectReconnect(t *testing.T) { |
||||
|
sg := NewSenderGroup() |
||||
|
sg.ApplyAssignment(AssignmentIntent{ |
||||
|
Endpoints: map[string]Endpoint{ |
||||
|
"r1:9333": {DataAddr: "r1:9333", Version: 1}, |
||||
|
}, |
||||
|
Epoch: 1, |
||||
|
}) |
||||
|
|
||||
|
r1 := sg.Sender("r1:9333") |
||||
|
original := r1 |
||||
|
|
||||
|
// 5 disconnect/reconnect cycles.
|
||||
|
for cycle := 0; cycle < 5; cycle++ { |
||||
|
sess, err := r1.AttachSession(1, SessionCatchUp) |
||||
|
if err != nil { |
||||
|
t.Fatalf("cycle %d: attach failed: %v", cycle, err) |
||||
|
} |
||||
|
r1.BeginConnect(sess.ID) |
||||
|
r1.RecordHandshake(sess.ID, uint64(cycle*10), uint64(cycle*10+10)) |
||||
|
r1.BeginCatchUp(sess.ID) |
||||
|
r1.RecordCatchUpProgress(sess.ID, uint64(cycle*10+10)) |
||||
|
if !r1.CompleteSessionByID(sess.ID) { |
||||
|
t.Fatalf("cycle %d: completion failed", cycle) |
||||
|
} |
||||
|
if r1.State != StateInSync { |
||||
|
t.Fatalf("cycle %d: state=%s", cycle, r1.State) |
||||
|
} |
||||
|
} |
||||
|
|
||||
|
// Identity preserved across all cycles.
|
||||
|
if sg.Sender("r1:9333") != original { |
||||
|
t.Fatal("sender identity should be preserved across 5 cycles") |
||||
|
} |
||||
|
t.Log("boundary: 5 disconnect/reconnect cycles, identity preserved") |
||||
|
} |
||||
|
|
||||
|
// --- Boundary 4: Full V2 Recovery Harness ---
|
||||
|
|
||||
|
func TestBoundary_FullV2RecoveryHarness(t *testing.T) { |
||||
|
// End-to-end: assignment → WAL-backed handshake → outcome branching →
|
||||
|
// execution → data verification.
|
||||
|
|
||||
|
primary := NewWALHistory() |
||||
|
for i := uint64(1); i <= 100; i++ { |
||||
|
primary.Append(WALEntry{LSN: i, Epoch: 1, Block: i % 8, Value: i}) |
||||
|
} |
||||
|
primary.Commit(100) |
||||
|
primary.AdvanceTail(20) // retain 21-100
|
||||
|
|
||||
|
sg := NewSenderGroup() |
||||
|
|
||||
|
// Assignment with 3 replicas at different states.
|
||||
|
sg.ApplyAssignment(AssignmentIntent{ |
||||
|
Endpoints: map[string]Endpoint{ |
||||
|
"r1:9333": {DataAddr: "r1:9333", Version: 1}, // will be zero-gap
|
||||
|
"r2:9333": {DataAddr: "r2:9333", Version: 1}, // will need catch-up
|
||||
|
"r3:9333": {DataAddr: "r3:9333", Version: 1}, // will need rebuild
|
||||
|
}, |
||||
|
Epoch: 1, |
||||
|
RecoveryTargets: map[string]SessionKind{ |
||||
|
"r1:9333": SessionCatchUp, |
||||
|
"r2:9333": SessionCatchUp, |
||||
|
"r3:9333": SessionCatchUp, |
||||
|
}, |
||||
|
}) |
||||
|
|
||||
|
// r1: zero-gap (at committed).
|
||||
|
r1 := sg.Sender("r1:9333") |
||||
|
s1 := r1.Session() |
||||
|
r1.BeginConnect(s1.ID) |
||||
|
o1, _ := r1.RecordHandshakeWithOutcome(s1.ID, primary.MakeHandshakeResult(100)) |
||||
|
if o1 != OutcomeZeroGap { |
||||
|
t.Fatalf("r1: outcome=%s, want zero_gap", o1) |
||||
|
} |
||||
|
r1.CompleteSessionByID(s1.ID) |
||||
|
|
||||
|
// r2: catch-up (gap 70-100, within retention).
|
||||
|
r2 := sg.Sender("r2:9333") |
||||
|
s2 := r2.Session() |
||||
|
r2.BeginConnect(s2.ID) |
||||
|
o2, _ := r2.RecordHandshakeWithOutcome(s2.ID, primary.MakeHandshakeResult(70)) |
||||
|
if o2 != OutcomeCatchUp { |
||||
|
t.Fatalf("r2: outcome=%s, want catchup", o2) |
||||
|
} |
||||
|
r2.BeginCatchUp(s2.ID) |
||||
|
entries, _ := primary.EntriesInRange(70, 100) |
||||
|
for _, e := range entries { |
||||
|
r2.RecordCatchUpProgress(s2.ID, e.LSN) |
||||
|
} |
||||
|
r2.CompleteSessionByID(s2.ID) |
||||
|
|
||||
|
// r3: needs rebuild (gap 10-100, but retention starts at 21).
|
||||
|
r3 := sg.Sender("r3:9333") |
||||
|
s3 := r3.Session() |
||||
|
r3.BeginConnect(s3.ID) |
||||
|
o3, _ := r3.RecordHandshakeWithOutcome(s3.ID, primary.MakeHandshakeResult(10)) |
||||
|
if o3 != OutcomeNeedsRebuild { |
||||
|
t.Fatalf("r3: outcome=%s, want needs_rebuild", o3) |
||||
|
} |
||||
|
|
||||
|
// Final states.
|
||||
|
if r1.State != StateInSync { |
||||
|
t.Fatalf("r1: %s", r1.State) |
||||
|
} |
||||
|
if r2.State != StateInSync { |
||||
|
t.Fatalf("r2: %s", r2.State) |
||||
|
} |
||||
|
if r3.State != StateNeedsRebuild { |
||||
|
t.Fatalf("r3: %s", r3.State) |
||||
|
} |
||||
|
|
||||
|
// InSync count.
|
||||
|
if sg.InSyncCount() != 2 { |
||||
|
t.Fatalf("in_sync=%d, want 2", sg.InSyncCount()) |
||||
|
} |
||||
|
|
||||
|
t.Log("harness: 3 replicas, 3 outcomes (zero-gap, catch-up, rebuild)") |
||||
|
} |
||||
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