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https://issues.apache.org/jira/browse/KAFKA-3217?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15136688#comment-15136688
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Ismael Juma commented on KAFKA-3217:
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Nice find!
> Unit tests which dont close producers auto-create topics in Kafka brokers of
> other tests when port is reused
> ------------------------------------------------------------------------------------------------------------
>
> Key: KAFKA-3217
> URL: https://issues.apache.org/jira/browse/KAFKA-3217
> Project: Kafka
> Issue Type: Bug
> Components: unit tests
> Affects Versions: 0.9.0.0
> Reporter: Rajini Sivaram
> Assignee: Rajini Sivaram
>
> Consumer tests occasionally fail the exception:
> {quote}
> kafka.common.TopicExistsException: Topic "topic" already exists.
> at
> kafka.admin.AdminUtils$.createOrUpdateTopicPartitionAssignmentPathInZK(AdminUtils.scala:261)
> at kafka.admin.AdminUtils$.createTopic(AdminUtils.scala:245)
> at kafka.utils.TestUtils$.createTopic(TestUtils.scala:237)
> at kafka.api.BaseConsumerTest.setUp(BaseConsumerTest.scala:65)
> {quote}
> Recreated this failure with some additional logging and it turns out that the
> failure is because a few tests which create a topic named "topic" close their
> Kafka server, but not the producer. When the ephemeral port used by the
> closed Kafka server gets reused in another Kafka server in a subsequent test,
> the producer retries of the previous test cause "topic" to be recreated using
> auto-create in the new Kafka server of the subsequent test. This results in
> an error in the consumer tests occasionally when the topic is auto-created
> before the test attempts to create it.
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