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https://issues.apache.org/jira/browse/KAFKA-19300?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17952388#comment-17952388
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Chia-Ping Tsai commented on KAFKA-19300:
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It seems the simple solution is to maybeCompleteLeaveInProgress even though the
previous state is UNSUBSCRIBED. this solution is also applied on the
success/failure path
> AsyncConsumer#unsubscribe always timeout due to GroupAuthorizationException
> ---------------------------------------------------------------------------
>
> Key: KAFKA-19300
> URL: https://issues.apache.org/jira/browse/KAFKA-19300
> Project: Kafka
> Issue Type: Bug
> Reporter: Chia-Ping Tsai
> Assignee: Chia-Ping Tsai
> Priority: Major
>
> it can be reproduced by
> GroupAuthorizerIntegrationTest.testConsumeUnsubscribeWithoutGroupPermission.
> The root cause is shown below.
> 1. AsyncConsumer#unsubscribe is executed
> 2. process(UnsubscribeEvent) changes the state to LEAVING
> 3. the state is changed to UNSUBSCRIBED in generating Heartbeat
> 4. the `LeaveInProgress` is skipped in transitionToFatal since the state is
> UNSUBSCRIBED
> The behavior is inconsistent to classic consumer
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