Chia-Ping Tsai created KAFKA-17017:
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Summary: 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
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` 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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