AI BriefingSudden Performance Degradation in Billing Pipeline, Root Cause Traced to a Hidden ClickHouse Bottleneck
·2026.05.14 22:00
Key point
We identified and patched a query planner lock contention issue in a petabyte-scale ClickHouse cluster.
Details
After making partitioning changes on a petabyte-scale ClickHouse cluster, critical billing jobs began stalling. Standard metrics showed nothing unusual, making it difficult to pinpoint the cause.
Upon analysis, we confirmed severe lock contention occurring inside ClickHouse's query planner.
To resolve this bottleneck, we created our own upstream patches and fixed the issue.
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