Init initializes a Decider (which is assumed to be zero).

NewFinder initiates a Finder with the given time.

10s.

A Decider collects measurements about the activity (measured in qps) on a Replica and, assuming that qps thresholds are exceeded, tries to determine a split key that would approximately result in halving the load on each of the resultant ranges.

Finder is a structure that is used to determine the split point using the Reservoir Sampling method.