6b52d22771
Verified the P4.2 implementation is complete: - All 6 integration tests pass (p42_node_addition.rs) - All 14 cutover chaos tests pass - All 8 topology chaos tests pass - Core components: rebalancer.rs, migration.rs, rebalancer_worker/mod.rs - Admin API: POST /_miroir/nodes endpoint Acceptance criteria met: - 3→4 node migration with 10K docs verified - Chaos testing confirms dual-write catches late writes - Performance bounds verified (≤total_docs/(Ng+1)×1.1) - Log inspection confirms old node not queried after migration Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
79 lines
3.1 KiB
Markdown
79 lines
3.1 KiB
Markdown
# P4.2 Node Addition: Dual-Write + Paginated Shard Migration - Verification
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## Summary
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Verified that the P4.2 node addition implementation is complete and fully functional. All acceptance criteria tests pass.
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## Implementation Verified
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### Core Components (Already Implemented)
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1. **`crates/miroir-core/src/rebalancer.rs`**:
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- `add_node()` method creates node addition operation
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- `compute_shard_moves_for_new_node()` determines affected shards
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- `run_migration_task()` executes paginated migration with dual-write
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- `HttpMigrationExecutor` implements actual HTTP-based document migration
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- Delta pass support for catching stragglers
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2. **`crates/miroir-core/src/migration.rs`**:
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- Complete migration state machine with all phases
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- `MigrationCoordinator` for state transitions
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- `begin_dual_write()` starts dual-write phase
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- `begin_cutover()`, `complete_drain()`, `complete_cleanup()` for cutover sequence
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- Safety validation (anti-entropy required if delta pass skipped)
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3. **`crates/miroir-core/src/rebalancer_worker/mod.rs`**:
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- Background worker with leader lease
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- `on_node_added()` handles topology events
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- `drive_migrations()` advances migration state machine
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- Job persistence via TaskStore
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4. **`crates/miroir-proxy/src/routes/admin_endpoints.rs`**:
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- `add_node` API endpoint
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- Integration with rebalancer worker via event channel
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### Integration Tests (All Pass)
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**`crates/miroir-core/tests/p42_node_addition.rs`**:
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1. `p42_node_addition_3_to_4_migration_10k_docs` - 10K docs migration test
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2. `p42_chaos_writes_during_migration_dual_write` - Dual-write chaos test
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3. `p42_performance_document_count_bounds` - Performance bounds verification
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4. `p42_log_inspection_old_node_not_queried_after_migration` - Log inspection test
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5. `p42_verify_dual_write_during_migration` - Dual-write verification
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6. `p42_pagination_limit_offset` - Pagination verification
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**`crates/miroir-core/tests/cutover_race.rs`**:
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- 14 chaos tests for cutover boundary conditions
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- All pass with anti-entropy and delta pass
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**`crates/miroir-core/tests/p4_topology_chaos.rs`**:
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- 8 topology chaos tests
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- All pass
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## Acceptance Criteria Status
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- [x] Integration test: 3-node → 4-node migration, 10K docs, each doc still retrievable by ID after migration
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- [x] Chaos: toggle writes on/off during migration; dual-write window catches all late writes
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- [x] Performance: migrating `~S/(Ng+1)` shards moves ≤ `total_docs / (Ng+1) × 1.1` docs (10% slack for dual-write dupes)
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- [x] The old node is not queried for the migrated shards after step 8 (verified via log inspection)
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## Test Results
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```
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running 6 tests (p42_node_addition)
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test p42_chaos_writes_during_migration_dual_write ... ok
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test p42_node_addition_3_to_4_migration_10k_docs ... ok
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test p42_log_inspection_old_node_not_queried_after_migration ... ok
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test p42_performance_document_count_bounds ... ok
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test p42_verify_dual_write_during_migration ... ok
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test p42_pagination_limit_offset ... ok
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test result: ok. 6 passed
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running 14 tests (cutover_race)
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test result: ok. 14 passed
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running 8 tests (p4_topology_chaos)
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test result: ok. 8 passed
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```
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Total: 28 tests passed, 0 failed.
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