A Journey from Big Python Monolith to Go Services
summary
Khan Academy migrates a 10-year Python 2 monolith into Go services, shipping ~750,000 lines of Go that implement about 5,000 GraphQL fields (85% of fields) and handle 95% of requests; migration runs from March 2019 to August 2021. Architecture uses a JavaScript GraphQL gateway with schema federation, Fastly CDN, App Engine history, and code generators like gqlgen and genqlient to produce type-safe server and client code; deployment uses side-by-side testing to compare Go vs Python results in production.
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chapters (6)
- 0:00Start
- 0:11A tale in three parts
- 1:55Rewrite? Really?
- 2:59Second Generation runtimes enable portable web apps
- 5:10The tech
- 20:37Delivering on time
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