TOPK.RESERVE key topk [ width depth decay]

Initializes a TopK with specified parameters.

Parameters

• key: Key under which the sketch is to be found.
• topk: Number of top occurring items to keep.

Optional parameters

• width: Number of counters kept in each array. (Default 8)
• depth: Number of arrays. (Default 7)
• decay: The probability of reducing a counter in an occupied bucket. It is raised to power of it's counter (decay ^ bucket[i].counter). Therefore, as the counter gets higher, the chance of a reduction is being reduced. (Default 0.9)

Return

[] otherwise.

Examples

redis> TOPK.RESERVE topk 50 2000 7 0.925
OK