The Story of rules_erlang

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" summary

RabbitMQ consolidates ~30 repos into a monorepo and cuts CI from 2–3 hours to about 17 minutes by creating rules_erlang (initial commit 2020‑11‑20, merged into server in PR #2398 with 221 commits on 2021‑03‑29). The build removes ~5,000 lines of YAML to 54, uses BuildBuddy RBE remote execution and cache, later adds in‑Bazel Erlang builds, Gazelle extension and coverage, but retains legacy Erlang MK builds and has partial Windows and packaging gaps.

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" chapters (18)

1. 0:00RabbitMQ and rules_erlang intro
2. 1:26RabbitMQ build problem 2020
3. 4:5830 repos at RabbitMQ
4. 6:23Solutions before Bazel
5. 9:12Speeding up builds
6. 9:57Bazel Erlang 20-min builds
7. 11:02Life after Bazel
8. 12:05Bazel setup gaps
9. 12:47rules_erlang releases timeline
10. 15:40Bazel adoption results
11. 17:07Two build systems struggle
12. 19:13rules_erlang limits
13. 20:39rules_erlang future plans
14. 21:44Bazel usefulness
15. 22:28Q&A: Coverage support
16. 25:08Q&A: 17-min builds
17. 26:53Q&A: Bazel vs Rebar
18. 28:41Closing remarks