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https://issues.apache.org/jira/browse/FLINK-20462?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17242990#comment-17242990
]
Matthias commented on FLINK-20462:
----------------------------------
I verified locally that the test is unstable. It failed after 2016 runs:
```
java.lang.AssertionError: java.lang.AssertionError: Expected: is <[0, 2, 4]>
but: was <[0, 42, 44]>Expected :is <[0, 2, 4]>Actual :<[0, 42, 44]><Click to
see difference>
at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:20) at
org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:8) at
org.apache.flink.streaming.runtime.operators.MailboxOperatorTest.testAvoidTaskStarvation(MailboxOperatorTest.java:85)
at sun.reflect.GeneratedMethodAccessor16.invoke(Unknown Source) 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:50)
at
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at
org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.rules.TestWatcher$1.evaluate(TestWatcher.java:55) at
org.junit.rules.RunRules.evaluate(RunRules.java:20) at
org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325) at
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) at
org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) at
org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) at
org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) at
org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) at
org.junit.runners.ParentRunner.run(ParentRunner.java:363) at
org.junit.runner.JUnitCore.run(JUnitCore.java:137) at
com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)
at
com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:52)
at
com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:220)
at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:53)
```
> MailboxOperatorTest.testAvoidTaskStarvation
> -------------------------------------------
>
> Key: FLINK-20462
> URL: https://issues.apache.org/jira/browse/FLINK-20462
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Task
> Affects Versions: 1.12.0
> Reporter: Huang Xingbo
> Priority: Major
> Labels: test-stability
>
> https://dev.azure.com/apache-flink/apache-flink/_build/results?buildId=10450&view=logs&j=f0ac5c25-1168-55a5-07ff-0e88223afed9&t=0dbaca5d-7c38-52e6-f4fe-2fb69ccb3ada
> {code:java}
> [ERROR]
> testAvoidTaskStarvation(org.apache.flink.streaming.runtime.operators.MailboxOperatorTest)
> Time elapsed: 1.142 s <<< FAILURE!
> java.lang.AssertionError:
>
> Expected: is <[0, 2, 4]>
> but: was <[0, 2, 516]>
> at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:20)
> at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:8)
> at
> org.apache.flink.streaming.runtime.operators.MailboxOperatorTest.testAvoidTaskStarvation(MailboxOperatorTest.java:85)
> {code}
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