Netflix processes an enormous 5 petabytes of logs daily using ClickHouse, managing 10.6 million events per second with sub-second query times, thanks to three key optimizations: faster log fingerprinting with generated lexers, improved serialization with a custom native protocol, and efficient sharding of tag maps. This system supports over 40,000 microservices, retaining logs from two weeks to two years, and handles 500 to 1,000 queries per second for debugging and monitoring. The architecture combines ClickHouse for speedy access to recent data and Apache Iceberg for cost-effective long-term storage, enabling near-instantaneous log searchability, often within 20 seconds. Achieving this required overcoming significant bottlenecks in ingestion, serialization, and querying, ultimately resulting in a highly interactive and scalable logging system. This allows Netflix to maintain smooth operations across 190 countries for over 300 million subscribers.