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https://issues.apache.org/jira/browse/KAFKA-14961?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17719933#comment-17719933
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Kirk True commented on KAFKA-14961:
-----------------------------------
cc [~pnee] [~lianetm]
> DefaultBackgroundThreadTest.testStartupAndTearDown test is flasky
> -----------------------------------------------------------------
>
> Key: KAFKA-14961
> URL: https://issues.apache.org/jira/browse/KAFKA-14961
> Project: Kafka
> Issue Type: Test
> Reporter: Manyanda Chitimbo
> Assignee: Manyanda Chitimbo
> Priority: Major
>
> When running the test suite locally I noticed the following error
> {code:java}
> org.opentest4j.AssertionFailedError: expected: <true> but was: <false>
> at
> app//org.junit.jupiter.api.AssertionFailureBuilder.build(AssertionFailureBuilder.java:151)
> at
> app//org.junit.jupiter.api.AssertionFailureBuilder.buildAndThrow(AssertionFailureBuilder.java:132)
> at app//org.junit.jupiter.api.AssertTrue.failNotTrue(AssertTrue.java:63)
> at app//org.junit.jupiter.api.AssertTrue.assertTrue(AssertTrue.java:36)
> at app//org.junit.jupiter.api.AssertTrue.assertTrue(AssertTrue.java:31)
> at app//org.junit.jupiter.api.Assertions.assertTrue(Assertions.java:180)
> at
> app//org.apache.kafka.clients.consumer.internals.DefaultBackgroundThreadTest.testStartupAndTearDown(DefaultBackgroundThreadTest.java:95)
> {code}
> which happened only once and I could reproduce it again.
> I further noticed some NPE in debug logs in the form of
> {code:java}
> ERROR The background thread failed due to unexpected error
> (org.apache.kafka.clients.consumer.internals.DefaultBackgroundThread:166)
> java.lang.NullPointerException
> at
> org.apache.kafka.clients.consumer.internals.DefaultBackgroundThread.handlePollResult(DefaultBackgroundThread.java:200)
> at
> java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
> at
> java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
> at
> java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177)
> at
> java.base/java.util.HashMap$ValueSpliterator.forEachRemaining(HashMap.java:1675)
> at
> java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
> at
> java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
> at
> java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913)
> at
> java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
> at
> java.base/java.util.stream.ReferencePipeline.reduce(ReferencePipeline.java:553)
> at
> org.apache.kafka.clients.consumer.internals.DefaultBackgroundThread.runOnce(DefaultBackgroundThread.java:187)
> at
> org.apache.kafka.clients.consumer.internals.DefaultBackgroundThread.run(DefaultBackgroundThread.java:159)
> {code}
> which is due to missing stubs.
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