KAFKA-17456: Make sure FindCoordinatorResponse get created before consumer

[frankvicky]

JIRA: KAFKA-17456

The incorrect order could lead to flaky (see KAFKA-17092 and KAFKA-17395). It would be nice that we fix all of them.

Committer Checklist (excluded from commit message)

• Verify design and implementation
• Verify test coverage and CI build status
• Verify documentation (including upgrade notes)

[kirktrue]

Thanks @frankvicky for the PR!

If this deflakes the tests, that would be a big win as the KafkaConsumerTest is one of the flakiest tests we have. We need to run the corresponding tests many times (I don't have an exact number) for both consumers to ensure that we've fixed the flakiness and haven't introduced any regressions.

Thanks!

[frankvicky]

I have looped the KafkaConsumerTest 360 times on my local machine.

[kirktrue]

@frankvicky—where are we on merging this? It appears the build and all tests pass.

[frankvicky]

@chia7712 Could you please take a look ?

[chia7712]

I looped testReturnRecordsDuringRebalance and see the following error:

Gradle Test Run :clients:test > Gradle Test Executor 253 > KafkaConsumerTest > testReturnRecordsDuringRebalance(GroupProtocol) > "testReturnRecordsDuringRebalance(GroupProtocol).groupProtocol=CLASSIC" FAILED
    org.opentest4j.AssertionFailedError: expected: <11> but was: <0>
        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.AssertEquals.failNotEqual(AssertEquals.java:197)
        at app//org.junit.jupiter.api.AssertEquals.assertEquals(AssertEquals.java:150)
        at app//org.junit.jupiter.api.AssertEquals.assertEquals(AssertEquals.java:145)
        at app//org.junit.jupiter.api.Assertions.assertEquals(Assertions.java:531)
        at app//org.apache.kafka.clients.consumer.KafkaConsumerTest.testReturnRecordsDuringRebalance(KafkaConsumerTest.java:2440)

@frankvicky could you please check it?

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