elek opened a new pull request #962: HDDS-1682. TestEventWatcher.testMetrics is flaky URL: https://github.com/apache/hadoop/pull/962 TestEventWatcher is intermittent. (Failed twice out of 44 executions). Error is: {code} Tests run: 3, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 7.764 s <<< FAILURE! - in org.apache.hadoop.hdds.server.events.TestEventWatcher testMetrics(org.apache.hadoop.hdds.server.events.TestEventWatcher) Time elapsed: 2.384 s <<< FAILURE! java.lang.AssertionError: expected:<2> but was:<3> at org.junit.Assert.fail(Assert.java:88) at org.junit.Assert.failNotEquals(Assert.java:743) at org.junit.Assert.assertEquals(Assert.java:118) at org.junit.Assert.assertEquals(Assert.java:555) at org.junit.Assert.assertEquals(Assert.java:542) at org.apache.hadoop.hdds.server.events.TestEventWatcher.testMetrics(TestEventWatcher.java:197) 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:47) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44) 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.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229) at org.junit.runners.ParentRunner.run(ParentRunner.java:309) at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:365) at org.apache.maven.surefire.junit4.JUnit4Provider.executeWithRerun(JUnit4Provider.java:273) at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:238) at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:159) at org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:384) at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:345) at org.apache.maven.surefire.booter.ForkedBooter.execute(ForkedBooter.java:126) at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:418) {code} In the test we do the following: 1. fire start-event1 2. fire start-event2 3. fire start-event3 4. fire end-event1 5. wait Usually the event2 and event3 are timed out and event1 is completed but in case of an accidental time between 3 and 4 (in fact between 1 and 4) the event1 also can be timed out. I improved the unit test and fixed the metrics calculation (completed message should be incremented only if it's not yet timed out). See: https://issues.apache.org/jira/browse/HDDS-1682
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