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Discord relies on ScyllaDB to serve millions of reads per second across many clusters, so they needed a comprehensive strategy to sufficiently de-risk upgrades to avoid impact to our users. To accomplish this, they use what they call “shadow clusters.” This talk explains how testing with shadow clusters has been paramount to de-risking complicated upgrades for one of the most important pieces of infrastructure at Discord.
Ethan is a Senior Software Engineer on the Persistence Infrastructure team at Discord. They live in New York City, and their favorite color is purple.
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