[Tez WebUI] Error 404 is reported when users access the Tez WebUI

When a user logs in to Manager and switches to the Tez web UI, error 404 or 503 is displayed.

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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 Exceptions in Accessing the MRS Web UI

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