codeant-ai-for-open-source[bot] commented on PR #38576:
URL: https://github.com/apache/superset/pull/38576#issuecomment-4054574452
## **Sequence Diagram**
This PR prevents duplicate dashboard thumbnail generation at two points: the
API now marks work as computing before enqueueing, and the Celery task now
skips if a fresh computing task already exists. Together, this avoids
concurrent Selenium sessions for the same dashboard.
```mermaid
sequenceDiagram
participant Client
participant DashboardAPI
participant Cache
participant CeleryTask
participant ScreenshotService
Client->>DashboardAPI: Request dashboard thumbnail
DashboardAPI->>Cache: Mark cache status as computing
DashboardAPI->>CeleryTask: Enqueue thumbnail task
Client->>DashboardAPI: Concurrent thumbnail request
DashboardAPI->>Cache: Check cache status
DashboardAPI-->>Client: Skip enqueue because already computing
CeleryTask->>Cache: Check existing status for cache key
alt Computing and not stale
CeleryTask-->>CeleryTask: Skip duplicate task
else Not computing or stale
CeleryTask->>ScreenshotService: Compute and cache thumbnail
end
```
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