Prefix and range-based mapping
Prefix and range-based mapping map ranges of keys (or hashes of keys) to cells, and serves to offset the downsides of the full mapping approach while providing flexibility.
Prefix and range-based mapping
Depending on the granularity of your service, you can further reduce the cardinality by making ranges of groups of keys.
Ranges as groups of keys
Advantages:
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Reduces the performance issue of full mapping, by grouping key and reducing the total cardinality.
Disadvantages:
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More likely to have a hot cell, as there is no control over which keys within each range might have the most traffic.
