[jira] [Created] (KAFKA-14961) DefaultBackgroundThreadTest.testStartupAndTearDown test is flasky

["Manyanda Chitimbo (Jira)" <ji...@apache.org>]

Manyanda Chitimbo created KAFKA-14961:
-----------------------------------------

             Summary: 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


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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