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https://issues.apache.org/jira/browse/FLINK-8731?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chesnay Schepler updated FLINK-8731:
------------------------------------
    Labels: test-stability  (was: )

> TwoInputStreamTaskTest flaky on travis
> --------------------------------------
>
>                 Key: FLINK-8731
>                 URL: https://issues.apache.org/jira/browse/FLINK-8731
>             Project: Flink
>          Issue Type: Improvement
>          Components: Streaming, Tests
>    Affects Versions: 1.5.0
>            Reporter: Chesnay Schepler
>            Priority: Major
>              Labels: test-stability
>
> https://travis-ci.org/zentol/flink/builds/344307861
> {code}
> Tests run: 5, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 2.479 sec <<< 
> FAILURE! - in org.apache.flink.streaming.runtime.tasks.TwoInputStreamTaskTest
> testOpenCloseAndTimestamps(org.apache.flink.streaming.runtime.tasks.TwoInputStreamTaskTest)
>   Time elapsed: 0.05 sec  <<< ERROR!
> java.lang.Exception: error in task
>       at 
> org.apache.flink.streaming.runtime.tasks.StreamTaskTestHarness.waitForTaskCompletion(StreamTaskTestHarness.java:250)
>       at 
> org.apache.flink.streaming.runtime.tasks.StreamTaskTestHarness.waitForTaskCompletion(StreamTaskTestHarness.java:233)
>       at 
> org.apache.flink.streaming.runtime.tasks.TwoInputStreamTaskTest.testOpenCloseAndTimestamps(TwoInputStreamTaskTest.java:99)
> Caused by: org.mockito.exceptions.misusing.WrongTypeOfReturnValue: 
> Boolean cannot be returned by getChannelIndex()
> getChannelIndex() should return int
> ***
> If you're unsure why you're getting above error read on.
> Due to the nature of the syntax above problem might occur because:
> 1. This exception *might* occur in wrongly written multi-threaded tests.
>    Please refer to Mockito FAQ on limitations of concurrency testing.
> 2. A spy is stubbed using when(spy.foo()).then() syntax. It is safer to stub 
> spies - 
>    - with doReturn|Throw() family of methods. More in javadocs for 
> Mockito.spy() method.
>       at 
> org.apache.flink.runtime.io.network.partition.consumer.UnionInputGate.waitAndGetNextInputGate(UnionInputGate.java:212)
>       at 
> org.apache.flink.runtime.io.network.partition.consumer.UnionInputGate.getNextBufferOrEvent(UnionInputGate.java:158)
>       at 
> org.apache.flink.streaming.runtime.io.BarrierBuffer.getNextNonBlocked(BarrierBuffer.java:164)
>       at 
> org.apache.flink.streaming.runtime.io.StreamTwoInputProcessor.processInput(StreamTwoInputProcessor.java:292)
>       at 
> org.apache.flink.streaming.runtime.tasks.TwoInputStreamTask.run(TwoInputStreamTask.java:115)
>       at 
> org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:308)
>       at 
> org.apache.flink.streaming.runtime.tasks.StreamTaskTestHarness$TaskThread.run(StreamTaskTestHarness.java:437)
> {code}



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