Uber Engineering·14 min read57Scaling Exact COUNT(DISTINCT) for High-Cardinality Non-Rollup Metrics in Distributed Data PipelinesDistributed SystemsObservabilitySystem DesignRead original on uber.comScore breakdownTechnical depth54Practical value75Originality60Writing quality100Source reputation88Recency10External engagement0On-site engagement0NayaRead shows a summary and links to the original article. The full article is hosted on uber.com.