mistercrunch opened a new pull request, #36143: URL: https://github.com/apache/superset/pull/36143
### SUMMARY This PR fixes Flask development server hanging/deadlocking in Docker environments by excluding unnecessary directories from the file watcher. Adds `--exclude-patterns` to the Flask development server to prevent watching `node_modules`, `.venv`, `build`, and `__pycache__` directories. This reduces inotify watch usage from ~285k to ~9.4k files per instance (97% reduction). **Problem:** The Flask reloader with watchdog was attempting to watch all ~285k files in the mounted volumes, exceeding typical inotify watch limits and causing the server to hang during initialization. **Solution:** Exclude directories that don't need to be watched for Python code changes, dramatically reducing resource usage and preventing the deadlock. ### BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF N/A - Backend performance improvement ### TESTING INSTRUCTIONS 1. Start Superset in development mode using `docker-compose-light.yml` 2. Verify Flask starts successfully with `--reload` enabled 3. Verify health endpoint responds: `curl http://localhost:8088/health` 4. Optional: Monitor inotify usage to confirm reduction in watch count ### ADDITIONAL INFORMATION - [ ] Has associated issue: Fixes hanging Flask dev server in Docker - [ ] Required feature flags: None - [ ] Changes UI: No - [ ] Includes DB Migration: No - [ ] Introduces new feature or API: No - [ ] Removes existing feature or API: No **Benefits:** - Enables running multiple Superset instances on same Docker host - Reduces system resource usage (inotify watches) - Faster Flask reloader initialization - More stable development environment -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
