The PostCommit Java ValidatesRunner Flink Java8 job is flaky

[github-actions]

The PostCommit Java ValidatesRunner Flink Java8 is failing over 50% of the time.
Please visit https://github.com/apache/beam/actions/workflows/beam_PostCommit_Java_ValidatesRunner_Flink_Java8.yml?query=is%3Afailure+branch%3Amaster to see all failed workflow runs.
See also Grafana statistics: http://metrics.beam.apache.org/d/CTYdoxP4z/ga-post-commits-status?orgId=1&viewPanel=5&var-Workflow=PostCommit%20Java%20ValidatesRunner%20Flink%20Java8

[liferoad]

2024-10-28T22:55:01.3071715Z org.apache.beam.sdk.transforms.ViewTest > testEmptyMultimapSideInput FAILED
2024-10-28T22:55:01.3074720Z org.apache.beam.sdk.Pipeline$PipelineExecutionException at ViewTest.java:1056
2024-10-28T22:55:01.3078164Z Caused by: java.lang.IllegalThreadStateException at ThreadGroup.java:867
2024-10-28T22:55:09.4063043Z
2024-10-28T22:55:09.4065126Z org.apache.beam.sdk.transforms.ViewTest > testCombinedMapSideInput FAILED
2024-10-28T22:55:09.4068769Z org.apache.beam.sdk.Pipeline$PipelineExecutionException at ViewTest.java:1632
2024-10-28T22:55:09.4070758Z Caused by: java.lang.IllegalThreadStateException at ThreadGroup.java:867
2024-10-28T22:55:12.6063577Z
2024-10-28T22:55:12.6066322Z org.apache.beam.sdk.transforms.ViewTest > testMultimapSideInputIsImmutable FAILED
2024-10-28T22:55:12.6069512Z org.apache.beam.sdk.Pipeline$PipelineExecutionException at ViewTest.java:1139
2024-10-28T22:55:12.6071854Z Caused by: java.lang.IllegalThreadStateException at ThreadGroup.java:867

[github-actions]

Reopening since the workflow is still flaky

[Amar3tto]

It appears that the job was initially unstable, but after upgrading from Flink 1.15 to 1.19 the failing rate increased.