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https://issues.apache.org/jira/browse/FLINK-19864?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17230415#comment-17230415
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Arvid Heise commented on FLINK-19864:
-------------------------------------
The find is most likely correct, although I don't think it's used as a
synchronization tool. The javadoc of the harness also clearly states "This
class id deprecated because of it's threading model. Please use {@link
StreamTaskMailboxTestHarness}." I'm assuming a proper fix is to migrate all 53
tests -.-. I'm happy to hear alternative suggestions.
If someone has the capacity to do so, please feel free to start. I'm not sure
if I'd find the time before the release to do so. But I also suggest to
decrease the priority, given that we only had one failed instance so far and
it's not indicating a production issue.
> TwoInputStreamTaskTest.testWatermarkMetrics failed with "expected:<1> but
> was:<-9223372036854775808>"
> -----------------------------------------------------------------------------------------------------
>
> Key: FLINK-19864
> URL: https://issues.apache.org/jira/browse/FLINK-19864
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Metrics, Runtime / Task
> Affects Versions: 1.12.0
> Reporter: Dian Fu
> Priority: Critical
> Labels: test-stability
> Fix For: 1.12.0
>
>
> https://dev.azure.com/apache-flink/apache-flink/_build/results?buildId=8541&view=logs&j=77a9d8e1-d610-59b3-fc2a-4766541e0e33&t=7c61167f-30b3-5893-cc38-a9e3d057e392
> {code}
> 2020-10-28T22:40:44.2528420Z [ERROR]
> testWatermarkMetrics(org.apache.flink.streaming.runtime.tasks.TwoInputStreamTaskTest)
> Time elapsed: 1.528 s <<< FAILURE! 2020-10-28T22:40:44.2529225Z
> java.lang.AssertionError: expected:<1> but was:<-9223372036854775808>
> 2020-10-28T22:40:44.2541228Z at org.junit.Assert.fail(Assert.java:88)
> 2020-10-28T22:40:44.2542157Z at
> org.junit.Assert.failNotEquals(Assert.java:834) 2020-10-28T22:40:44.2542954Z
> at org.junit.Assert.assertEquals(Assert.java:645)
> 2020-10-28T22:40:44.2543456Z at
> org.junit.Assert.assertEquals(Assert.java:631) 2020-10-28T22:40:44.2544002Z
> at
> org.apache.flink.streaming.runtime.tasks.TwoInputStreamTaskTest.testWatermarkMetrics(TwoInputStreamTaskTest.java:540)
> {code}
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