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Marek Szakowicz
Lead maintainer of etcd and senior software engineer at Google specializing in distributed systems, reliability, and testing practices such as deterministic simulation and robustness testing.
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Dec 5, 2025
• 21min
How etcd Solved Its Knowledge Drain with Deterministic Testing
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Marek Szakowicz, lead maintainer of etcd and senior software engineer at Google, discusses tackling the critical challenges faced by the etcd project due to maintainer turnover and lost knowledge. He dives into the innovative approaches the team adopted, such as robustness testing inspired by Jepsen to ensure system correctness. Marek also details the collaboration with Antithesis to implement deterministic simulation testing, which enables reproducible outcomes and enhances reliability. His insights underscore the importance of rigorous testing in open source projects.
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