What is Cloudflare K2?

Software systems often have one part that produces events, such as a completed purchase, and other parts that need to read them, such as an analytics system or a fraud check. This is hard when senders produce more than readers can handle, or when a reader is unavailable, because events can be dropped. A common remedy is a durable log in the middle that stores events so each reader can catch up at its own pace; Apache Kafka is a well-known example. Cloudflare K2 is a durable, append-only log: producers add records to a stream, K2 keeps them for a configurable retention period, and several independent readers can consume the same stream through subscriptions. Cloudflare announced it on October 1, 2026.

Written from primary sources and reference pages, and checked against them by an independent AI fact-checker. Drafted with AI assistance.