Cap'n Proto 1.0: A Long-Awaited Milestone for the High-Performance Serialization Protocol

2023/07/28

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The article announces the release of Cap'n Proto 1.0, a major milestone for the high-performance serialization protocol. Although there are no groundbreaking features in this release, the author acknowledges that Cap'n Proto has been widely used in production for many years. The protocol is heavily utilized by Cloudflare, the author's employer, and is responsible for encoding millions (possibly billions) of messages and gigabits (perhaps terabits) of data every second. The release of version 1.0 paves the way for the development of Cap'n Proto 2.0, which will bring some backward-incompatible changes to improve the developer experience. However, to accommodate users who prefer stability, the author plans to provide long-term support for version 1.0 by backporting bug fixes. The article also highlights some optimizations made in version 1.0 to enhance the performance of Cap'n Proto RPC, including memory allocation reduction, message elision, and improved message buffering. Overall, Cap'n Proto 1.0 signifies a significant milestone for the protocol and sets the stage for future enhancements in version 2.0.