[FLINK-13805] Bad Error Message when TaskManager is lost

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 1.9.0
• Fix Version/s: 1.9.1, 1.10.0
• Component/s: Runtime / Coordination
• Labels: pull-request-available
• Assignee: Till Rohrmann
• Reporter: Stephan Ewen
• Created: 20/Aug/19 18:01
• Updated: 29/Aug/19 15:56
• Resolved: 29/Aug/19 15:56

Description

When a TaskManager is lost, the job reports as the failure cause

org.apache.flink.util.FlinkException: The assigned slot 6d0e469d55a2630871f43ad0f89c786c_0 was removed.

That is a pretty bad error message, as a user I don't know what that means. Sounds like it could simply refer to internal book keeping, maybe some rebalancing or so.
You need to know a lot about Flink to understand that this means actually "TaskManager failure".

Issue Links

• links to: GitHub Pull Request #9550