dosubot[bot] commented on issue #30287:
URL: https://github.com/apache/superset/issues/30287#issuecomment-2353167639
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@mpolatcan Hello! I'm here to help you with any bugs, questions, or
contributions.
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I found some similar issues that might help you:
1. **[Question] Are dashboard thumbnails generated periodically?** (Closed)
- **Solution**: The issue was closed as stale. If the problem persists in
current versions, it was suggested to reopen the issue or raise a new one with
updated context.
- [Link to issue](https://github.com/apache/superset/issues/22540)
<sup>[[1]](https://github.com/apache/superset/issues/22540)</sup>
2. **[chart] "Unexpected error" in Dashboard thumbnails (Superset 1.0.1)**
(Closed)
- **Solution**: Adding "can read on Chart" permission resolved the issue.
- [Link to issue](https://github.com/apache/superset/issues/13490)
<sup>[[2]](https://github.com/apache/superset/issues/13490)</sup>
3. **Why does only the thumbnail function in the chart work? The dashboard
does not appear.** (Closed)
- **Solution**: A regression on the master branch caused dashboard
thumbnails to fail, which was fixed by a specific pull request.
- [Link to issue](https://github.com/apache/superset/issues/23120)
<sup>[[3]](https://github.com/apache/superset/issues/23120)</sup>
Regarding your specific issue, the problem might be related to the caching
logic for the Dashboard thumbnails. Ensure that the `cache_dashboard_thumbnail`
function is being triggered correctly and that the `thumbnail_cache` is
properly configured and accessible. Check the logs for any warnings or errors
related to the caching process, as indicated by the logging statements in the
code:
```python
if not thumbnail_cache:
logging.warning("No cache set, refusing to compute")
return
```
If the cache is not set, the function will refuse to compute the thumbnail,
which could explain why the thumbnails are not appearing on the Dashboard page
<sup>[[4]](https://github.com/apache/superset/blob/master/superset/tasks/thumbnails.py)</sup>.
Additionally, there are specific differences in how the Home, Chart, and
Dashboard pages handle thumbnail caching and retrieval. The
`DashboardScreenshot` class has specific configurations for handling
thumbnails, including different default window and thumbnail sizes, URL
modifications, and cache key parameters
<sup>[[5]](https://github.com/apache/superset/blob/master/superset/utils/screenshots.py)</sup><sup>[[6]](https://github.com/apache/superset/blob/master/superset/config.py)</sup><sup>[[7]](https://github.com/apache/superset/blob/master/docs/docs/configuration/cache.mdx)</sup><sup>[[4]](https://github.com/apache/superset/blob/master/superset/tasks/thumbnails.py)</sup><sup>[[8]](https://github.com/apache/superset/blob/master/tests/integration_tests/thumbnails_tests.py)</sup>.
Ensure that your S3 cache is correctly configured and accessible, and verify
that the `cache_dashboard_thumbnail` function is being called as expected.
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