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Lessons learned modernizing Apache Kafka CI builds with Develocity and GitHub Actions
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You've probably heard the phrase, "You can’t improve what you can't measure." This was true for CI build and test times for the popular OSS streaming platform, Apache Kafka. And this very lack of observability finally led the project committers to hit their breaking point.
As a result, Apache Kafka underwent a major overhaul in 2025—going from a nearly defunct 8-hour build cycle to evergreen 2-hour builds. All by modernizing its CI infrastructure away from Jenkins to GitHub Actions.
Join David Arthur, Apache Kafka PMC and Senior Staff Software Engineer at Confluent, as he shares his lessons-learned from the migration, including how Develocity helped quantify performance gains and prove their modernization ROI.
- Using toolchain observability to help manage the CI migration from Jenkins to GitHub Actions, plus some custom workflows the team developed
- Tips for leveraging Build Cache to save hours of wasted time by avoiding unnecessary task re-runs
- Employing Flaky Test Detection to resolve the ever-present specter of flaky tests in a project with over 32,000 tests and a 7-hour serial runtime
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