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Cloudflare Identifies Query Planning Bottleneck in ClickHouse

Source: feed.infoq.com 1 min read

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Cloudflare Identifies Query Planning Bottleneck in ClickHouse

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Cloudflare recently described how a slowdown in its billing pipeline was traced to contention inside the query planning stage of ClickHouse. The team profiled the bottleneck and patched ClickHouse to replace an exclusive lock with a shared lock, drop the per-query copy of the parts list, and improve part filtering. By Renato Losio

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