🚀Cloudflare K2 Beta: Serverless Event Streaming for the Masses
K2: Cheaper Kafka Alternative with a Twist
TL;DR
Cloudflare's K2 is now in public beta, offering a cheaper alternative to Kafka with 1s p99 latency. It's built for cost and elasticity, using R2 object storage. Pricing is $0.04 per GB produced, $0.02 per GB per month for retention, and nothing during the beta.
Cloudflare just launched K2 in public beta, a serverless event streaming service that uses R2 object storage for a partitioned durable log. The trade-off is 1s p99 latency, but it's cheaper than Kafka. If you're running Kafka for event streaming, K2 could save you money, especially for longer retention. Pricing is $0.04 per GB produced and $0.02 per GB per month for retention, with no charges during the beta. K2 is built for cost and elasticity, making it a game-changer for teams looking to reduce cloud expenses.
Key Points
K2 uses R2 object storage for a partitioned durable log, offering eleven nines of durability with strongly consistent APIs.
Pricing: $0.04 per GB produced, $0.02 per GB per month for retention, with no charges during the beta.
K2 holds writes in memory on an edge service, then writes the batch out as a segment file, with R2's atomic operations for ordering and incrementing offsets.
The beta limits are 10GB of storage and 30 MB/s produce per stream, with future work including message keys, key-based ordering, and Kafka client support.
K2 is built for the Cloudflare ecosystem, using a lease-based consume API for higher read parallelism, and is cheaper than self-hosted or cloud-hosted Kafka.
Why It Matters
If you're running Kafka for event streaming, K2 could save you money, especially for longer retention. Pricing is $0.04 per GB produced and $0.02 per GB per month for retention, with no charges during the beta. The 1s p99 latency might be a trade-off, but the cost savings could be significant for teams looking to reduce cloud expenses.
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