Wrote a blog post on the easypost engineering blog1 about the big project to replace MySQL2 with Cassandra for storing webhook data. This was a big project that almost went totally sideways, but ended up working out in the end.
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Updated 2025-12-16: EasyPost replaced all their blog content with AI slop, so this now links to archive.org. Fie on them!
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Fine, actually Percona XtraDB Cluster
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