RANDOMKEY
Return a random key from the keyspace.
RANDOMKEYComplexity
O(1) expected
Complexity and compatibility are read out of kevy's implementation, not copied from Redis's reference. Several genuinely differ.
Redis compatibility
Differs
the result is NOT random — each shard returns the first live key in hash-bucket order and the reducer takes the first shard's, so a fixed keyspace returns the same key every time; do not use it for sampling