We halved DNS build delay and cut memory use by 85%
Zone setting changes used to rebuild entire DNS zones, even ones with tens of millions of records. Here is how we built a planner that picks the smallest safe build, cutting full builds by 40%, peak memory by 85%, and halving build delay.
Cloudflare reduced DNS build delay by half and cut memory use by 85% through targeted build planning and scheduling.
DNS zone changes increased from 250 to 700 per second, with larger zones up to 20 million records.
A targeted build planner minimizes work while ensuring data accuracy and safety.
Memory use dropped 85%, and DNS change processing time was halved.
Summarised automatically by AI from the original article by Hacker News. AI can make mistakes, so check the original for details.
When I last wrote about our DNS propagation pipeline in 2022, the Zone Builder received about 250 DNS record changes per second. Today it receives about 700, nearly three times as many, plus about 100 other events, such as zone setting changes. However, the number of events was never the real problem. The problem was the kind of work some of those events needed, and how that work grows with the size of a zone. Some zones now hold more than 20 million records, and we expect them to keep growing toward hundreds of millions.
Each event starts a clock that measures how long it takes us to turn that change into data our authoritative DNS servers can use. We call that work a build. A build reads the current database state, converts it into the format used at the edge, and writes any changes to Quicksilver.
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