Quack: The DuckDB Client-Server Protocol

2026-05-13

Quack is a new HTTP-based client-server protocol that lets multiple DuckDB instances talk to each other and supports multiple concurrent writers, expanding DuckDB beyond its original in-process model. It is designed to be simple, fast, and DuckDB-native, with strong bulk-transfer performance, efficient small writes, token-based authentication, and planned integration with DuckLake and DuckDB 2.0.