[Failing Test]: Java PreCommit UnboundedScheduledExecutorServiceTest testThreadsAreAddedOnlyAsNeededWithContention flaky

[Abacn]

What happened?

This happens relatively frequently.

java.lang.AssertionError
	at org.junit.Assert.fail(Assert.java:87)
	at org.junit.Assert.assertTrue(Assert.java:42)
	at org.junit.Assert.assertTrue(Assert.java:53)
	at org.apache.beam.sdk.util.UnboundedScheduledExecutorServiceTest.testThreadsAreAddedOnlyAsNeededWithContention(UnboundedScheduledExecutorServiceTest.java:556)

Example run:

https://github.com/apache/beam/runs/26191522964

Issue Failure

Failure: Test is flaky

Issue Priority

Priority: 2 (backlog / disabled test but we think the product is healthy)

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