DefaultJobBundleFactoryTest.loadBalancesBundles flake

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.fnexecution.control.DefaultJobBundleFactoryTest.loadBalancesBundles(DefaultJobBundleFactoryTest.java:475)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
	at org.junit.rules.ExpectedException$ExpectedExceptionStatement.evaluate(ExpectedException.java:266)
	at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:305)
	at org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:365)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63)
	at org.junit.runners.ParentRunner$4.run(ParentRunner.java:330)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:78)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:328)
	at org.junit.runners.ParentRunner.access$100(ParentRunner.java:65)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:292)
	at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:305)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:412)
	at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.runTestClass(JUnitTestClassExecutor.java:110)
	at 

[Test worker] INFO org.apache.beam.runners.fnexecution.control.DefaultJobBundleFactory - Closing environment null
[Test worker] INFO org.apache.beam.runners.fnexecution.control.DefaultJobBundleFactory - Closing environment null
[Test worker] INFO org.apache.beam.runners.fnexecution.control.DefaultJobBundleFactory - Closing environment null
[Test worker] INFO org.apache.beam.runners.fnexecution.control.DefaultJobBundleFactory - Closing environment null
[Test worker] WARN org.apache.beam.runners.fnexecution.control.DefaultJobBundleFactory - Expiring environment urn: "dummy:urn"
 with 1 remaining bundle references. Taking note to clean it up during shutdown if the references are not removed by then.
[Test worker] WARN org.apache.beam.runners.fnexecution.control.DefaultJobBundleFactory - Expiring environment urn: "dummy:urn"
 with 1 remaining bundle references. Taking note to clean it up during shutdown if the references are not removed by then.
[Test worker] INFO org.apache.beam.runners.fnexecution.control.DefaultJobBundleFactory - Closing environment null
[Test worker] INFO org.apache.beam.runners.fnexecution.control.DefaultJobBundleFactory - Closing environment null
[Test worker] INFO org.apache.beam.runners.fnexecution.control.DefaultJobBundleFactory - Closing environment null
[Test worker] INFO org.apache.beam.runners.fnexecution.control.DefaultJobBundleFactory - Closing environment null
[Test worker] INFO org.apache.beam.runners.fnexecution.control.DefaultJobBundleFactory - Closing environment null
[Test worker] INFO org.apache.beam.runners.fnexecution.control.DefaultJobBundleFactory - Closing environment null
[Test worker] INFO org.apache.beam.runners.fnexecution.control.DefaultJobBundleFactory - Closing environment null
[Test worker] INFO org.apache.beam.runners.fnexecution.control.DefaultJobBundleFactory - Closing environment null
[Test worker] INFO org.apache.beam.runners.fnexecution.control.DefaultJobBundleFactory - Closing environment null
[Test worker] INFO org.apache.beam.runners.fnexecution.control.DefaultJobBundleFactory - Closing environment null
[Test worker] INFO org.apache.beam.runners.fnexecution.control.DefaultJobBundleFactory - Closing environment null
[Test worker] INFO org.apache.beam.runners.fnexecution.control.DefaultJobBundleFactory - Closing environment null
[Test worker] INFO org.apache.beam.runners.fnexecution.control.DefaultJobBundleFactory - Closing environment null
[Test worker] INFO org.apache.beam.runners.fnexecution.control.DefaultJobBundleFactory - Closing environment null
[Test worker] INFO org.apache.beam.runners.fnexecution.control.DefaultJobBundleFactory - Closing environment null
[Test worker] INFO org.apache.beam.runners.fnexecution.control.DefaultJobBundleFactory - Closing environment null
[Test worker] INFO org.apache.beam.runners.fnexecution.control.DefaultJobBundleFactory - Closing environment null
[Test worker] INFO org.apache.beam.runners.fnexecution.control.DefaultJobBundleFactory - Closing environment null
[Test worker] INFO org.apache.beam.runners.fnexecution.control.DefaultJobBundleFactory - Closing environment null
[Test worker] INFO org.apache.beam.runners.fnexecution.control.DefaultJobBundleFactory - Closing environment null
[Test worker] INFO org.apache.beam.runners.fnexecution.control.DefaultJobBundleFactory - Closing environment null
[Test worker] INFO org.apache.beam.runners.fnexecution.control.DefaultJobBundleFactory - Closing environment null
[Test worker] INFO org.apache.beam.runners.fnexecution.control.DefaultJobBundleFactory - Closing environment null
[Test worker] INFO org.apache.beam.runners.fnexecution.control.DefaultJobBundleFactory - Closing environment null
[Test worker] INFO org.apache.beam.runners.fnexecution.control.DefaultJobBundleFactory - Closing environment null
[Test worker] INFO org.apache.beam.runners.fnexecution.control.DefaultJobBundleFactory - Closing environment null
[Test worker] INFO org.apache.beam.runners.fnexecution.control.DefaultJobBundleFactory - Closing environment null
[Test worker] INFO org.apache.beam.runners.fnexecution.control.DefaultJobBundleFactory - Closing environment null