This is a guest blog post co-authored by Francois Jehl and Pawel Szostek. Francois is the lead of the Analytics Data Storage team at Criteo; Pawel is a software engineer in the Analytics Data Storage team at Criteo.
Criteo is the global leader in digital performance advertising with 900B ads served in 2016. The R&D department make this possible by managing 20 000 servers in 15 datacenters, and has been intensively using Vertica for 4 years.
Today, Vertica at Criteo is deployed on more than 100 nodes and serves 200TB of analytic data to 2500 internal users every day.
Check it out here: https://my.vertica.com/blog/using-vertica-hyperloglog/