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https://issues.apache.org/jira/browse/KAFKA-8245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16822606#comment-16822606
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Matthias J. Sax commented on KAFKA-8245:
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[https://builds.apache.org/blue/organizations/jenkins/kafka-trunk-jdk8/detail/kafka-trunk-jdk8/3573/tests]
> Flaky Test DeleteConsumerGroupsTest#testDeleteCmdAllGroups
> ----------------------------------------------------------
>
> Key: KAFKA-8245
> URL: https://issues.apache.org/jira/browse/KAFKA-8245
> Project: Kafka
> Issue Type: Bug
> Components: admin, unit tests
> Affects Versions: 2.3.0
> Reporter: Matthias J. Sax
> Priority: Critical
> Labels: flaky-test
> Fix For: 2.3.0
>
>
> [https://builds.apache.org/job/kafka-pr-jdk11-scala2.12/3781/testReport/junit/kafka.admin/DeleteConsumerGroupsTest/testDeleteCmdAllGroups/]
> {quote}java.lang.AssertionError: The group did become empty as expected. at
> kafka.utils.TestUtils$.fail(TestUtils.scala:381) at
> kafka.utils.TestUtils$.waitUntilTrue(TestUtils.scala:791) at
> kafka.admin.DeleteConsumerGroupsTest.testDeleteCmdAllGroups(DeleteConsumerGroupsTest.scala:148){quote}
> STDOUT
> {quote}Error: Deletion of some consumer groups failed: * Group 'test.group'
> could not be deleted due to: java.util.concurrent.ExecutionException:
> org.apache.kafka.common.errors.GroupNotEmptyException: The group is not
> empty. Error: Deletion of some consumer groups failed: * Group
> 'missing.group' could not be deleted due to:
> java.util.concurrent.ExecutionException:
> org.apache.kafka.common.errors.GroupIdNotFoundException: The group id does
> not exist. [2019-04-16 09:42:02,316] WARN Unable to read additional data from
> client sessionid 0x104f958dba30000, likely client has closed socket
> (org.apache.zookeeper.server.NIOServerCnxn:376) Deletion of requested
> consumer groups ('test.group') was successful. Error: Deletion of some
> consumer groups failed: * Group 'missing.group' could not be deleted due to:
> java.util.concurrent.ExecutionException:
> org.apache.kafka.common.errors.GroupIdNotFoundException: The group id does
> not exist. These consumer groups were deleted successfully:
> 'test.group'{quote}
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