CLUSTERCluster topology introspection (virtual-node model over shards).
| 语法 | CLUSTER INFO | NODES | SLOTS | SHARDS | KEYSLOT key | COUNTKEYSINSLOT slot |
| 分组 | server |
| 参数个数 | -2 |
| 起始版本 | 1.0.0 |
| 标志 | readonly, admin |
| 复杂度 | INFO / NODES / SLOTS / SHARDS / MYID: O(S). KEYSLOT: O(len(key)). COUNTKEYSINSLOT: O(N/S) |
| Redis 兼容性 | differs: a read-only virtual-node topology derived from config (one virtual master per shard) — no gossip, no MEET / FORGET / SETSLOT effect (they reply OK as no-ops), no MIGRATE / ASK, no failover; COUNTKEYSINSLOT counts only the answering shard's keys |