Kenneth Knowles created BEAM-10515:
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Summary: Failure / flake in MemoryMonitorTest > detectGCThrashing
Key: BEAM-10515
URL: https://issues.apache.org/jira/browse/BEAM-10515
Project: Beam
Issue Type: Bug
Components: runner-dataflow
Reporter: Kenneth Knowles
[https://ci-beam.apache.org/job/beam_PreCommit_Java_Commit/12409/testReport/junit/org.apache.beam.runners.dataflow.worker.util/MemoryMonitorTest/detectGCThrashing/]
{code}
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.runners.dataflow.worker.util.MemoryMonitorTest.detectGCThrashing(MemoryMonitorTest.java:93)
{code}
This is a bad assertion, as one must read the code to learn anything.
The code snippet is:
{code}
provider.inGCThrashingState.set(false);
monitor.waitForThrashingState(false);
assertTrue(s.tryAcquire(100, TimeUnit.MILLISECONDS));
{code}
This is a timeout acquiring a lock in 100 milliseconds.
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