On: Redis new data structure: the HyperLogLog

[PanMan]

Does anybody have a good example of this? E.g. to count unique hits over time without storing each hit?

[nerfhammer → PanMan]

Here's a cool example of using HLL in javascript to dynamically show set union/intersections for huge sets:

http://www.aggregateknowledge.com/science/blog/venn.html