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Improving Valkey with Madelyn Olson

Published 9 Feb 2026

Duration: 00:38:11

A podcast discusses Valky, an open-source alternative to Redis, highlighting its key features and capabilities as a drop-in replacement.

Episode Description

In this episode, Thomas Betts chats with Madelyn Olson, a maintainer of the Valkey project and a Principal Software Development Engineer at Amazon Ela...

Overview

The podcast presents Valky as an open-source key-value store created as an alternative to Redis following its license change. It emphasizes Valky's design as a drop-in replacement for Redis 7.2, offering full backward compatibility to ease migration. Since its initial fork in 2023, Valky has undergone several major releases, including 8.0, 8.1, and 9.0, evolving with a focus on performance enhancements, better memory optimization, and support for modern infrastructure features like horizontal clustering and replication.

Technical aspects discussed include Valky's use of an embedded key approach in hash tables, modifications to memory layout for efficiency, and the implementation of a binary index tree to support efficient sampling. The development team employs micro benchmarking and profiling tools such as Perf and flame graphs to ensure that performance remains on par with previous versions and to avoid any regression. Additionally, the podcast mentions Valky's vendor-neutral governance model and its ability to support extensions written in Rust, while keeping the core of the system in C. Real-world deployment examples are shared, along with insights into maintaining high-performance C code while incorporating new developments in Rust.

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