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https://issues.apache.org/jira/browse/BEAM-5197?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16700223#comment-16700223
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Maximilian Michels commented on BEAM-5197:
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I've only tested the fix on MacOS and on Jenkins which also has Linux.
Unfortunately, this test class is notorious for failures. I'll look into
refactoring it to make it less prone to flakiness.
> Flaky test: UnboundedSourceWrapperTest$ParameterizedUnboundedSourceWrapperTest
> ------------------------------------------------------------------------------
>
> Key: BEAM-5197
> URL: https://issues.apache.org/jira/browse/BEAM-5197
> Project: Beam
> Issue Type: Improvement
> Components: runner-flink
> Reporter: Thomas Weise
> Assignee: Kenneth Knowles
> Priority: Critical
> Labels: flake
> Fix For: 2.10.0
>
> Time Spent: 2h 20m
> Remaining Estimate: 0h
>
> {code:java}
> java.lang.NullPointerException
> at
> org.apache.flink.streaming.runtime.tasks.TestProcessingTimeService$1.compare(TestProcessingTimeService.java:52)
> at
> org.apache.flink.streaming.runtime.tasks.TestProcessingTimeService$1.compare(TestProcessingTimeService.java:49)
> at java.util.PriorityQueue.siftUpUsingComparator(PriorityQueue.java:670)
> at java.util.PriorityQueue.siftUp(PriorityQueue.java:646)
> at java.util.PriorityQueue.offer(PriorityQueue.java:345)
> at
> org.apache.flink.streaming.runtime.tasks.TestProcessingTimeService.registerTimer(TestProcessingTimeService.java:93)
> at
> org.apache.beam.runners.flink.translation.wrappers.streaming.io.UnboundedSourceWrapper.setNextWatermarkTimer(UnboundedSourceWrapper.java:452)
> at
> org.apache.beam.runners.flink.translation.wrappers.streaming.io.UnboundedSourceWrapper.run(UnboundedSourceWrapper.java:225)
> at
> org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:87)
> at
> org.apache.beam.runners.flink.streaming.UnboundedSourceWrapperTest$ParameterizedUnboundedSourceWrapperTest.testValueEmission(UnboundedSourceWrapperTest.java:153)
> {code}
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