[FLINK-27042] StreamTaskTest#testMailboxMetricsScheduling is unstable

• Type: Technical Debt
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.16.0
• Fix Version/s: 1.16.0
• Component/s: Runtime / Task, Tests
• Labels: pull-request-available
• Assignee: Sebastian Mattheis
• Reporter: Chesnay Schepler
• Created: 03/Apr/22 21:24
• Updated: 05/Apr/22 08:06
• Resolved: 05/Apr/22 08:06

Description

java.lang.AssertionError: 
Expected: a value greater than <0L>
     but: <0L> was equal to <0L>

	at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:20)
	at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:8)
	at org.apache.flink.streaming.runtime.tasks.StreamTaskITCase.testMailboxMetricsScheduling(StreamTaskTest.java:1823)

Can be reproduced locally by looping the test. Probably due to wrong assumptions about 2 time measurements being different.

Issue Links

• links to: GitHub Pull Request #19354