GitHub user dosubot[bot] added a comment to the discussion: How can I integrate Superset charts with PlayWright to ensure that all charts and data on the page are fully rendered and there are no unexpected errors before taking a screenshot?
<!-- Answer --> To address 502 Bad Gateway errors in Superset caused by high server load, network issues, or timeouts, focus on these areas: **1. Increase timeouts and enable retries:** - In `superset_config.py`, raise `SUPERSET_WEBSERVER_TIMEOUT` (e.g., to 300 seconds), `SQLLAB_TIMEOUT`, and `SQLLAB_ASYNC_TIME_LIMIT_SEC` for long queries. - For screenshot automation, set `SCREENSHOT_LOCATE_WAIT` and `SCREENSHOT_LOAD_WAIT` to higher values (e.g., 120–600 seconds) to give charts more time to render before timing out [[example config](https://github.com/apache/superset/issues/5993#issuecomment-3284091878)]. - Enable and tune Superset's HTTP retry logic for transient 502/503/504 errors: ```python SUPERSET_CLIENT_RETRY_ATTEMPTS = 3 SUPERSET_CLIENT_RETRY_DELAY = 1000 # ms SUPERSET_CLIENT_RETRY_BACKOFF_MULTIPLIER = 2 SUPERSET_CLIENT_RETRY_MAX_DELAY = 10000 # ms SUPERSET_CLIENT_RETRY_JITTER_MAX = 1000 # ms SUPERSET_CLIENT_RETRY_STATUS_CODES = [502, 503, 504] ``` This helps Superset automatically retry failed chart data requests with exponential backoff and jitter [[details](https://github.com/apache/superset/pull/34290)]. **2. Tune your proxy and web server:** - In Nginx, increase `proxy_read_timeout`, `proxy_connect_timeout`, and `proxy_send_timeout` to be higher than your Superset/Gunicorn timeouts to avoid premature 502/504 errors [[discussion](https://github.com/apache/superset/discussions/31743#discussioncomment-11767901)]. - For Gunicorn, increase the keepalive setting to handle more concurrent users and avoid ECONNRESET errors that can manifest as 502s [[discussion](https://github.com/apache/superset/discussions/33373)]. **3. Scale and monitor resources:** - Make sure your Superset server and database have enough CPU and RAM. 8GB RAM and 2vCPUs is a baseline for moderate use, but usage spikes (e.g., many users loading dashboards at once) may require more [[faq](https://github.com/apache/superset/blob/master/docs/docs/faq.mdx)]. - Monitor server, database, and network health. Look for slow queries, high CPU/memory usage, or network bottlenecks. **4. Optimize queries and database performance:** - Slow or complex queries are a common cause of timeouts and 502 errors. Optimize your dashboards and underlying SQL, and consider using a more performant database engine if needed [[faq](https://github.com/apache/superset/blob/master/docs/docs/faq.mdx)]. **5. Use asynchronous query execution:** - Enable async queries in Superset (via Celery) to allow long-running queries to complete without blocking the web server, reducing the risk of timeouts and 502 errors [[async config](https://github.com/apache/superset/blob/master/docs/docs/configuration/async-queries-celery.mdx)]. **6. Troubleshoot persistent errors:** - Check Superset, database, and proxy logs for errors or timeouts. - Verify network connectivity between Superset, the database, and any proxies. - If using Docker/Kubernetes, ensure the worker containers have access to the Superset instance and required headless browsers for screenshots. These steps should help reduce the frequency of 502 errors and improve the reliability of chart rendering and screenshot automation in Superset. <!-- Dosu Comment Footer --> *To reply, just mention [@dosu](https://go.dosu.dev/dosubot).* --- <sup>How did I do? 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[](https://cursor.com/link/prompt?text=To%20address%20502%20Bad%20Gateway%20errors%20in%20Superset%20caused%20by%20high%20server%20load%2C%20network%20issues%2C%20or%20timeouts%2C%20focus%20on%20these%20areas%3A%0A%0A%2A%2A1.%20Increase%20timeouts%20and%20enable%20retries%3A%2A%2A%20%20%0A-%20In%20%60superset_config.py%60%2C%20raise%20%60SUPERSET_WEBSERVER_TIMEOUT%60%20%28e.g.%2C%20to%20300%20seconds%29%2C%20%60SQLLAB_TIMEOUT%60%2C%20and%20%60SQLLAB_ASYNC_TIME_LIMIT_SEC%60%20for%20long%20queries.%20%20%0A-%20For%20screenshot%20automation%2C%20set%20%60SCREENSHOT_LOCATE_WAIT%60%20and%20%60SCREENSHOT_LOAD_WAIT%60%20to%20higher%20values%20%28e.g.%2C%20120%E2%80%93600%20seconds%29%20to%20give%20charts%20more%20time%20to%20render%20before%20timing%20out%20%5B%5Bexample%20config%5D%28https%3A//g 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20errors%3A%2A%2A%20%20%0A-%20Check%20Superset%2C%20database%2C%20and%20proxy%20logs%20for%20errors%20or%20timeouts.%0A-%20Verify%20network%20connectivity%20between%20Superset%2C%20the%20database%2C%20and%20any%20proxies.%0A-%20If%20using%20Docker/Kubernetes%2C%20ensure%20the%20worker%20containers%20have%20access%20to%20the%20Superset%20instance%20and%20required%20headless%20browsers%20for%20screenshots.%0A%0AThese%20steps%20should%20help%20reduce%20the%20frequency%20of%20502%20errors%20and%20improve%20the%20reliability%20of%20chart%20rendering%20and%20screenshot%20automation%20in%20Superset.) 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