Scheduler Task Priority Update Sequence Diagram

Scenario

A user or admin submits a request to change a task's priority in a scheduler. The Scheduler Service validates the task, updates the in‑memory Task Queue, and persists the change to the database.

Key decisions

• Check whether the task exists before making changes
• Apply priority update atomically to both queue and persistent storage
• Return clear HTTP status codes to indicate success or failure

When to reuse this

Use this pattern when designing REST endpoints for task priority modifications or when modeling backend orchestration in job schedulers that maintain a queue and a data store.