P4: Phase 4 topology operations verification — all chaos tests pass
Verified Phase 4 (Topology Operations) is complete:
Chaos Tests (22/22 passing):
- chaos_add_node_mid_indexing — add node during indexing, all docs readable
- chaos_drain_node_while_querying — drain during queries, zero failures
- chaos_add_replica_group_while_querying — add group, existing groups unaffected
- chaos_rebalance_optimal_movement — ≤2×(1/4) doc movement for 3→4 nodes
- chaos_restart_node_mid_rebalance — failure during rebalance, resume on recovery
- chaos_rendezvous_determinism — rendezvous hash consistency
- chaos_cannot_remove_last_node — safety guard for last node
- chaos_cannot_remove_last_group — safety guard for last group
- Plus 14 cutover_race tests for dual-write safety
Implementation Complete:
- Rebalancer with add/remove/drain node and group operations
- MigrationCoordinator with dual-write + delta pass
- HttpMigrationExecutor for HTTP-based document migration
- Admin API endpoints (POST/DELETE /_miroir/nodes, /_miroir/replica_groups)
- CLI commands (miroir-ctl node add/remove/drain/list, rebalance status)
Test Results:
- Library tests: 262 passed
- Chaos tests: 22 passed
- Total: 284 tests passed
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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