Help Center> MapReduce Service> Component Operation Guide> Using Tez> Common Issues> Error Occurs When a User Switches to the Tez Web UI
Error Occurs When a User Switches to the Tez Web UI
Question
When a user logs in to Manager and switches to the Tez web UI, error 404 or 503 is displayed.
Answer
The Tez web UI depends on the TimelineServer instance of Yarn. Therefore, TimelineServer must be installed in advance and in the Good state.
Parent topic: Common Issues
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