Locally Debugging Supergraphs at Dow Jones with Rover CLI Extensions
summary
Dow Jones runs a 17-subgraph supergraph (422 types, ~3,000 fields) serving ~11 million CDN-passed requests/day and struggles to test combinations locally. The team builds Rover Runner, a VS Code extension that launches local subgraphs via npm, starts Redis, injects up‑to‑date introspection keys, generates a temporary supergraph.yaml and calls Rover Dev to run a router. It enables IDE breakpoints to catch a real bug (JS whitespace in name length), sped up debugging for a 2M→6M‑request mobile rollout, and is open source.
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chapters (8)
- 0:00Introduction to Dow Jones
- 1:33Challenges with Rover CLI
- 2:55Introducing Rover Runner
- 4:45Configuring Rover Runner
- 6:14Debugging in action
- 9:22Shutting down the environment
- 10:00Real-world impact and results
- 11:42Open source and conclusion
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