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In the previous post , I built a clap button for this blog using Cloudflare Workers and KV. It worked. Mostly. The problem was concurrency. KV is an eventually consistent key-value store. When two people clap at the same time, both reads return the same value, both increment by one, and one clap disappears. Read-modify-write on KV is not atomic. For a blog that gets three readers on a good day,…
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