"Resharding"
- Redis Cluster Re-sharding：source = target，但 topology 重劃的 5 段流程 Redis cluster re-sharding 是 5 type migration 漏類實證 — source / target 同 cluster、無 schema / paradigm 差、但 16384 slot 重分配是核心；本文涵蓋 4 種 re-sharding driver、slot migration 機制、redis-cli --cluster rebalance / reshard 工具、5 個 production 踩雷（cluster busy / replica lag / client cache stale / cross-slot transaction / monitor gap）