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https://issues.apache.org/jira/browse/KAFKA-8011?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16781105#comment-16781105
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ASF GitHub Bot commented on KAFKA-8011:
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bbejeck commented on pull request #6338: KAFKA-8011: Fix for race condition
causing ConcurrentModificationException
URL: https://github.com/apache/kafka/pull/6338
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> Flaky Test RegexSourceIntegrationTest#testRegexMatchesTopicsAWhenCreated
> ------------------------------------------------------------------------
>
> Key: KAFKA-8011
> URL: https://issues.apache.org/jira/browse/KAFKA-8011
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Reporter: Bill Bejeck
> Assignee: Bill Bejeck
> Priority: Critical
> Labels: flaky-test, newbie
>
> The RegexSourceIntegrationTest#testRegexMatchesTopicsAWhenCreated
> and RegexSourceIntegrationTest#testRegexMatchesTopicsAWhenDeleted tests use
> an ArrayList to assert the topics assigned to the Streams application.
> The ConsumerRebalanceListener used in the test operates on this list as does
> the TestUtils.waitForCondition() to verify the expected topic assignments.
> Using the same list in both places can cause a ConcurrentModficationException
> if the rebalance listener modifies the assignment at the same time
> TestUtils.waitForCondition() is using the list to verify the expected topics.
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