// Cloudflare Blog · 14 May 2026

Our billing pipeline was suddenly slow. The culprit was a hidden bottleneck in ClickHouse

When a partitioning change to our petabyte-scale ClickHouse cluster caused critical billing jobs to stall, standard metrics showed no obvious errors. This post explores how we identified severe lock contention in ClickHouse's query planner and built upstream patches to fix it.

Cloudflare Blog

@cloudflare-blog · James Morrison

blog.cloudflare.com

Cloudflare Blog@cloudflare-blog