Cap'n Proto 1.0 (capnproto.org)

Article summary

The creator of Cap'n Proto has released version 1.0 of the C++ reference implementation, marking a milestone after ten years of development. The release is largely a long-term support version, with few new features, and is intended to provide a stable base for users who do not want to keep up with future changes. The next version, 2.0, is planned to include significant changes to the C++ API and toolkit library. These changes are motivated by the needs of the Cloudflare Workers runtime, which uses Cap'n Proto extensively.

Main themes

• Cap'n Proto 1.0 release
• Future development plans
• Language support
• Promise pipelining
• Stateful servers
• Load balancing
• Serialization formats
• Cloudflare Workers runtime

What commenters say

• Cap'n Proto's lack of support for many languages is a significant weakness.
• The protocol's design decisions are well-suited for certain use cases, but may not be widely understood or appreciated.
• Promise pipelining is a valuable feature of Cap'n Proto that allows for more efficient and flexible communication between services.
• The difficulty of load balancing with stateful servers is a challenge that Cap'n Proto's protocol is well-equipped to address.
• Some users are interested in contributing to the development of Cap'n Proto, particularly in implementing support for additional languages.
• The choice of Cap'n Proto over other serialization formats, such as Protocol Buffers, was likely due to its performance advantages and flexibility.
• The use of Cap'n Proto in production environments, such as Cloudflare, demonstrates its reliability and effectiveness.