codeant-ai-for-open-source[bot] commented on PR #38576:
URL: https://github.com/apache/superset/pull/38576#issuecomment-4055433954
## **Sequence Diagram**
This PR prevents duplicate thumbnail generation for the same dashboard by
marking work as computing before task enqueue and adding an early dedup check
inside the Celery task. Together, these changes stop concurrent requests from
launching multiple Selenium sessions.
```mermaid
sequenceDiagram
participant ClientA as Client
participant ClientB as Concurrent Client
participant API as Dashboard API
participant Cache
participant Queue as Celery Queue
participant Worker as Thumbnail Worker
ClientA->>API: Request dashboard thumbnail
API->>Cache: Set status to COMPUTING
API->>Queue: Enqueue thumbnail task
API-->>ClientA: Return accepted response
ClientB->>API: Request same thumbnail
API->>Cache: Check current status
API-->>ClientB: Skip new enqueue
Queue->>Worker: Run thumbnail task
Worker->>Cache: Check status for cache key
alt Already computing and not stale
Worker-->>Queue: Skip duplicate task
else Not computing or stale
Worker->>Worker: Compute and cache thumbnail
end
```
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