[
https://issues.apache.org/jira/browse/KAFKA-9786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17070831#comment-17070831
]
ASF GitHub Bot commented on KAFKA-9786:
---------------------------------------
chia7712 commented on pull request #8385: #9786 KAFKA-9786 fix flaky
MetricsTest.testGeneralBrokerTopicMetricsA…
URL: https://github.com/apache/kafka/pull/8385
```
java.lang.AssertionError: expected:<18> but was:<23>
at org.junit.Assert.fail(Assert.java:89)
at org.junit.Assert.failNotEquals(Assert.java:835)
at org.junit.Assert.assertEquals(Assert.java:647)
at org.junit.Assert.assertEquals(Assert.java:633)
at
kafka.metrics.MetricsTest.testGeneralBrokerTopicMetricsAreGreedilyRegistered(MetricsTest.scala:108)
```
As gradle may use same JVM to run multiples test (see
https://docs.gradle.org/current/dsl/org.gradle.api.tasks.testing.Test.html#org.gradle.api.tasks.testing.Test:forkEvery),
the metrics from other tests can break
```MetricsTest.testGeneralBrokerTopicMetricsAreGreedilyRegistered```.
```
private def topicMetrics(topic: Option[String]): Set[String] = {
val metricNames =
KafkaYammerMetrics.defaultRegistry.allMetrics().keySet.asScala.map(_.getMBeanName)
filterByTopicMetricRegex(metricNames, topic)
}
```
```MetricsTest.testGeneralBrokerTopicMetricsAreGreedilyRegistered``` is not
captured by QA since the guy who leaves orphan metrics in JVM is
```ReplicaManagerTest``` and it belongs to ```integrationTest```. By contrast,
```MetricsTest``` is a part of ```unitTest```. Hence, they are NOT executed by
same JVM (since they are NOT in the same task).
```MetricsTest.testGeneralBrokerTopicMetricsAreGreedilyRegistered``` fails
frequently on my jenkins because my jenkins verify kafka by running "./gradlew
clean core:test".
### Committer Checklist (excluded from commit message)
- [ ] Verify design and implementation
- [ ] Verify test coverage and CI build status
- [ ] Verify documentation (including upgrade notes)
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> fix flaky MetricsTest.testGeneralBrokerTopicMetricsAreGreedilyRegistered
> ------------------------------------------------------------------------
>
> Key: KAFKA-9786
> URL: https://issues.apache.org/jira/browse/KAFKA-9786
> Project: Kafka
> Issue Type: Test
> Reporter: Chia-Ping Tsai
> Assignee: Chia-Ping Tsai
> Priority: Minor
>
> {code:java}
> java.lang.AssertionError: expected:<18> but was:<23>
> at org.junit.Assert.fail(Assert.java:89)
> at org.junit.Assert.failNotEquals(Assert.java:835)
> at org.junit.Assert.assertEquals(Assert.java:647)
> at org.junit.Assert.assertEquals(Assert.java:633)
> at
> kafka.metrics.MetricsTest.testGeneralBrokerTopicMetricsAreGreedilyRegistered(MetricsTest.scala:108)
> {code}
> As gradle may use same JVM to run multiples test (see
> https://docs.gradle.org/current/dsl/org.gradle.api.tasks.testing.Test.html#org.gradle.api.tasks.testing.Test:forkEvery),
> the metrics from other tests can break
> MetricsTest.testGeneralBrokerTopicMetricsAreGreedilyRegistered.
> {code:scala}
> private def topicMetrics(topic: Option[String]): Set[String] = {
> val metricNames =
> KafkaYammerMetrics.defaultRegistry.allMetrics().keySet.asScala.map(_.getMBeanName)
> filterByTopicMetricRegex(metricNames, topic)
> }
> {code}
> MetricsTest.testGeneralBrokerTopicMetricsAreGreedilyRegistered is not
> captured by QA since the guy who leaves orphan metrics in JVM is
> ReplicaManagerTest and it belongs to integrationTest. By contrast,
> MetricsTest is a part of unitTest. Hence, they are NOT executed by same JVM
> (since they are NOT in the same task).
> MetricsTest.testGeneralBrokerTopicMetricsAreGreedilyRegistered fails
> frequently on my jenkins because my jenkins verify kafka by running
> "./gradlew clean core:test".
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