[FLINK-32314] Ignore class-loading errors after RPC system shutdown

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.18.0, 1.16.3, 1.17.2
• Component/s: Runtime / RPC, Tests
• Labels: pull-request-available
• Assignee: Chesnay Schepler
• Reporter: Chesnay Schepler
• Created: 12/Jun/23 12:20
• Updated: 04/Jul/23 16:45
• Resolved: 13/Jun/23 21:32

Description

In tests we occasionally see the akka rpc service throwing class loading errors after it was shut down.
AFAICT our shutdown procedure is correct, and it's just akka shutting down some things asynchronously.
I couldn't figure out why/what is still running, so as a bandaid I suggest to ignore classloading errors after the rpc service shutdown has completed.

Issue Links

• fixes: FLINK-32189 Integration tests fail due to Process Exit Code: 239 and NoClassDefFound in logs
• links to: GitHub Pull Request #22764