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cqlsh Rewrite in Rust

1 post · Jun 2026

What this trail covers

ScyllaDB has developed and released cqlsh-rs, a complete rewrite of the Python cqlsh in Rust. This rewrite addresses long-standing issues with Python dependency management and improves the reliability and performance of the COPY TO/FROM feature. The new Rust-based cqlsh provides a static binary with zero runtime dependencies, simplifying deployment and maintenance, and resolving critical bugs and performance bottlenecks in bulk data import/export.

All ScyllaDB trails
  1. Dear cqlsh: Your dependencies were killing us (P.S. We rewrote you in Rust)This post details the motivation and process behind rewriting the Python cqlsh tool in Rust. Key technical drivers include eliminating Python dependency management nightmares, improving the reliability and performance of the COPY TO/FROM feature, and achieving a static binary with zero runtime dependencies. The post highlights the challenges of vendoring dependencies in the Python version and the benefits of Rust's compilation model for deployment and maintenance. It also touches upon the use of AI (Claude Code) as a tool in the development process.