Multiple ChoiceBeginner 45s
HyperLogLog cardinality error
HyperLogLog estimates the number of distinct elements. Why is it unsuitable for exact per-user counting?
Options
- 1It cannot merge across shards, so each keeps its own exact count and cannot combine
- 2It is probabilistic and has a bounded relative error, not exact counts
- 3It requires storing every element it has seen, so memory scales linearly
- 4It only works for up to 1000 elements, above which the estimate saturates
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