[jira] [Commented] (KAFKA-19828) Intermittent test failures when using chained emit strategy on window close

["Greg F (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-19828?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18032321#comment-18032321 ] 

Greg F commented on KAFKA-19828:
--------------------------------

Most of the time I run the test, I see this:
[INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.880 s -- in com.k8sflowprocessor.ChainedEmitStrategyTopologyTest3
[INFO] 
[INFO] Results:
[INFO] 
[INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0
[INFO] 

However, like I mentioned, every once in a while I see this:

[ERROR] Tests run: 1, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 1.058 s <<< FAILURE! -- in com.k8sflowprocessor.ChainedEmitStrategyTopologyTest3
[ERROR] com.k8sflowprocessor.ChainedEmitStrategyTopologyTest3.testChainedWindowedAggregationsWithDifferentGracePeriods -- Time elapsed: 1.049 s <<< FAILURE!
java.lang.AssertionError: expected:<1> but was:<0>
    at org.junit.Assert.fail(Assert.java:89)
    at org.junit.Assert.failNotEquals(Assert.java:835)
    at org.junit.Assert.assertEquals(Assert.java:647)
    at org.junit.Assert.assertEquals(Assert.java:633)
    at com.k8sflowprocessor.ChainedEmitStrategyTopologyTest3.testChainedWindowedAggregationsWithDifferentGracePeriods(ChainedEmitStrategyTopologyTest3.java:116)

 





 

> Intermittent test failures when using chained emit strategy on window close
> ---------------------------------------------------------------------------
>
>                 Key: KAFKA-19828
>                 URL: https://issues.apache.org/jira/browse/KAFKA-19828
>             Project: Kafka
>          Issue Type: Bug
>          Components: streams
>            Reporter: Greg F
>            Priority: Major
>         Attachments: ChainedEmitStrategyTopologyTest3.java
>
>
> Hi,
> I have a test case that contains a topology with 2 time windows and chained emitStrategy calls. The standalone reproduction use case is attached to this issue
> The problem is that about 25% of the time the test fails. About 75% of the time the test succeeds. I followed the conclusions of 
> !https://issues.apache.org/jira/secure/viewavatar?size=xsmall&avatarId=21133&avatarType=issuetype|width=16,height=16! KAFKA-19810
> to make sure that I am sending events at the correct times (at least I think my calculations are correct). I really need to get to the bottom of why the test fails intermittently, as the test somewhat reflects a real life topology of a project I am working on, and we cannot have an intermittently failing test in our build pipeline. 
> Greg
>  



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