September 2015
Beginner to intermediate
230 pages
4h 47m
English
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HyperLogLogs
A HyperLogLog is not actually a real data type in Redis. Conceptually, a HyperLogLog is an algorithm that uses randomization in order to provide a very good approximation of the number of unique elements that exist in a Set. It is fascinating because it only runs in O(1), constant time, and uses a very small amount of memory—up to 12 kB of memory per key. Although technically a HyperLogLog is not a real data type, we are going to consider it as one because Redis provides specific commands to manipulate Strings in order to calculate the cardinality of a set using the HyperLogLog algorithm.
The HyperLogLog algorithm is probabilistic, which means that it does not ensure 100 percent accuracy. The Redis implementation of the HyperLogLog ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.