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https://issues.apache.org/jira/browse/KAFKA-4049?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15429594#comment-15429594
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ASF GitHub Bot commented on KAFKA-4049:
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Github user guozhangwang closed the pull request at:
https://github.com/apache/kafka/pull/1746
> Transient failure in
> RegexSourceIntegrationTest.testRegexMatchesTopicsAWhenDeleted
> ----------------------------------------------------------------------------------
>
> Key: KAFKA-4049
> URL: https://issues.apache.org/jira/browse/KAFKA-4049
> Project: Kafka
> Issue Type: Sub-task
> Components: streams
> Reporter: Guozhang Wang
> Assignee: Guozhang Wang
> Labels: test
>
> There is an hidden assumption in this test case that the created
> {{TEST-TOPIC-A}} and {{TEST-TOPIC-B}} are propagated to the streams client at
> the same time, and stored as {{assignedTopicPartitions[0]}}. However this is
> not always true since these two topics may be added on the client side as two
> consecutive metadata refreshes.
> The proposed fix includes the following:
> 1. In {{waitForCondition}} do not trigger the {{conditionMet}} function again
> after the while loop, but just remember the returned value from the last
> call. This is safer so that if the condition changes after the while loop it
> will not be considered as well.
> 2. Not remembering a map of all the previous assigned partitions, but only
> the most recent one. And also get rid of the final check after streams client
> is closed by just use {{equals}} in the condition to make sure that it is
> exactly the same to the expected assignment.
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