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https://issues.apache.org/jira/browse/KAFKA-21014?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18110426#comment-18110426
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Chia-Ping Tsai commented on KAFKA-21014:
----------------------------------------

There are two possible causes:
 # The topic creation may not have completed before the verification.
 # The topic metadata may not have propagated to the broker before the 
verification.

Using `TestUtils.waitForCondition`is probably able to stabilize the test :) 

> Fix flaky testAdminRebootstrapDisabled
> --------------------------------------
>
>                 Key: KAFKA-21014
>                 URL: https://issues.apache.org/jira/browse/KAFKA-21014
>             Project: Kafka
>          Issue Type: Bug
>            Reporter: Chia-Ping Tsai
>            Assignee: Chia-Ping Tsai
>            Priority: Major
>
> Gradle Test Run :clients:clients-integration-tests:test > Gradle Test 
> Executor 10 > ClientRebootstrapTest > 
> testAdminRebootstrapDisabled(ClusterInstance) > testAdminRebootstrapDisabled 
> [1] Type=Raft-Isolated, 
> MetadataVersion=4.5-IV0,BrokerSecurityProtocol=PLAINTEXT,BrokerListenerName=ListenerName(EXTERNAL),ControllerSecurityProtocol=PLAINTEXT,ControllerListenerName=ListenerName(CONTROLLER)
>  FAILED
>     org.opentest4j.AssertionFailedError: expected: <true> but was: <false>
>         at 
> app//org.junit.jupiter.api.AssertionFailureBuilder.build(AssertionFailureBuilder.java:151)
>         at 
> app//org.junit.jupiter.api.AssertionFailureBuilder.buildAndThrow(AssertionFailureBuilder.java:132)
>         at 
> app//org.junit.jupiter.api.AssertTrue.failNotTrue(AssertTrue.java:63)
>         at 
> app//org.junit.jupiter.api.AssertTrue.assertTrue(AssertTrue.java:36)
>         at 
> app//org.junit.jupiter.api.AssertTrue.assertTrue(AssertTrue.java:31)
>         at 
> app//org.junit.jupiter.api.Assertions.assertTrue(Assertions.java:183)
>         at 
> app//org.apache.kafka.clients.ClientRebootstrapTest.testAdminRebootstrapDisabled(ClientRebootstrapTest.java:101)
> 1 test completed, 1 failed



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