Cloudflare 正式发布 K2 公测版，这是一项新的 serverless 事件流服务1。该服务旨在解决生产者和消费者在规模和时间上不对齐导致的数据丢失问题1。K2 以有序日志的形式存储事件，构建在 R2 对象存储之上，支持长期数据保留、高规模扩展和独立的消费者读取1。
K2 在公测阶段向 Workers Paid 订阅账户用户开放1。该服务在 99th 百分位处理时间下的生产延迟约为 1 秒，最大存储限制为 10GB，生产速率为每秒 30MB（公测期间）1。作为 Cloudflare 开发者平台的新产品，K2 与现有的 Queues 和 Basin Pipelines 服务在功能定位上有所区别，K2 主要面向高规模数据移动和长期保留场景，并支持批量处理1。
公测期间该服务不收费，后续计划按使用量付费1。Cloudflare 针对 K2 的未来规划包括支持多 GB/s 的流速、消息键和基于键的排序保证、基于推送的 Worker 消费者、Express 层以及 Apache Kafka 客户端支持1。
Cloudflare has announced the public beta release of K2, a serverless event streams service designed to address data loss issues caused by misalignment between producers and consumers in scale and timing.1 Built on top of R2 object storage, K2 enables long-term data retention, high-scale expansion, and independent consumer reads, with initial access offered to Workers Paid subscription accounts.1
K2 functions as a durable event stream primitive on Cloudflare's developer platform, storing events in ordered log format.1 During the beta period, the service supports a maximum storage limit of 10GB and a production rate of 30 MB/s, with production latency of approximately one second at the 99th percentile.1 The platform differentiates itself from existing offerings such as Queues and Basin Pipelines by targeting high-scale data movement and long-term retention while enabling batch processing capabilities.1
No charges apply during the beta phase, though usage-based pricing is anticipated for future releases.1 Cloudflare has outlined several planned enhancements, including multi-GB/s throughput, message keys with key-based sorting guarantees, push-based Worker consumers, an Express tier, and support for Apache Kafka clients.1
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