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https://issues.apache.org/jira/browse/KAFKA-17017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17856800#comment-17856800
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PoAn Yang commented on KAFKA-17017:
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Hi [~chia7712], I'm interested in this issue. If you're not working on it, may
I take it? Thank you.
> AsyncConsumer#unsubscribe does not clean the assigned partitions
> ----------------------------------------------------------------
>
> Key: KAFKA-17017
> URL: https://issues.apache.org/jira/browse/KAFKA-17017
> Project: Kafka
> Issue Type: Bug
> Reporter: Chia-Ping Tsai
> Assignee: Chia-Ping Tsai
> Priority: Major
>
> According to docs [0] `Consumer#unsubscribe` should clean both subscribed and
> assigned partitions. However, there are two issues about `AsyncConsumer`
> 1) if we don't set group id, `AsyncConsumer#unsubscribe`[1] will be no-op
> 2) if we set group id, `AsyncConsumer` is always in `UNSUBSCRIBED` state and
> so `MembershipManagerImpl#leaveGroup`[2] will be no-op
> [0]
> https://github.com/apache/kafka/blob/trunk/clients/src/main/java/org/apache/kafka/clients/consumer/KafkaConsumer.java#L759
> [1]
> https://github.com/apache/kafka/blob/trunk/clients/src/main/java/org/apache/kafka/clients/consumer/internals/AsyncKafkaConsumer.java#L1479
> [2]
> https://github.com/apache/kafka/blob/trunk/clients/src/main/java/org/apache/kafka/clients/consumer/internals/MembershipManagerImpl.java#L666
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