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https://issues.apache.org/jira/browse/KAFKA-8747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16926806#comment-16926806
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ASF GitHub Bot commented on KAFKA-8747:
---------------------------------------
stanislavkozlovski commented on pull request #7320: KAFKA-8747: Fix the flaky
ControllerEventManagerTest#testEventQueueTimeQuery test
URL: https://github.com/apache/kafka/pull/7320
This patch adds retry functionality to the testEventQueueTime test assertion
The test has been flaky, presumably due to some race condition with Yammer's
JMX reporter and when the tested histogram metric gets updated.
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> Flaky Test ControllerEventManagerTest#testEventQueueTime
> --------------------------------------------------------
>
> Key: KAFKA-8747
> URL: https://issues.apache.org/jira/browse/KAFKA-8747
> Project: Kafka
> Issue Type: Bug
> Components: core, unit tests
> Affects Versions: 2.4.0
> Reporter: Matthias J. Sax
> Priority: Critical
> Labels: flaky-test
>
> [https://builds.apache.org/job/kafka-pr-jdk11-scala2.12/6671/testReport/junit/kafka.controller/ControllerEventManagerTest/testEventQueueTime/]
> {quote}java.lang.AssertionError: expected:<500.0> but was:<0.0> at
> org.junit.Assert.fail(Assert.java:89) at
> org.junit.Assert.failNotEquals(Assert.java:835) at
> org.junit.Assert.assertEquals(Assert.java:555) at
> org.junit.Assert.assertEquals(Assert.java:685) at
> kafka.controller.ControllerEventManagerTest.testEventQueueTime(ControllerEventManagerTest.scala:100){quote}
> STDOUT:
> {quote}[2019-08-01 18:51:09,815] ERROR [ControllerEventThread controllerId=0]
> Uncaught error processing event BrokerChange
> (kafka.controller.ControllerEventManager$ControllerEventThread:76)
> java.lang.NullPointerException at
> kafka.controller.ControllerEventManagerTest.$anonfun$testEventThatThrowsException$1(ControllerEventManagerTest.scala:112)
> at scala.Function0.apply$mcV$sp(Function0.scala:39) at
> kafka.controller.ControllerEventManagerTest$$anon$3.process(ControllerEventManagerTest.scala:126)
> at kafka.controller.QueuedEvent.process(ControllerEventManager.scala:53) at
> kafka.controller.ControllerEventManager$ControllerEventThread.$anonfun$doWork$1(ControllerEventManager.scala:137)
> at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23) at
> kafka.metrics.KafkaTimer.time(KafkaTimer.scala:31) at
> kafka.controller.ControllerEventManager$ControllerEventThread.doWork(ControllerEventManager.scala:137)
> at kafka.utils.ShutdownableThread.run(ShutdownableThread.scala:89)
> {quote}
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