Lianet Magrans created KAFKA-19288:
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Summary: Ensure new consumer joining attempt not overwritten on
delayed HB response to previous leave
Key: KAFKA-19288
URL: https://issues.apache.org/jira/browse/KAFKA-19288
Project: Kafka
Issue Type: Bug
Components: clients, consumer
Reporter: Lianet Magrans
Assignee: Lianet Magrans
Fix For: 4.1.0
For the asyn consumer, check and cover edge case where the consumer may
transition to JOINING, but receive a delayed response to a previous leave
request. We should ensure that the response is ignored and the consumer joins
as it intended.
I expect this doesn't usually happens given that the unsubscribe is a blocking
operation, so the consumer won't be able to join until the unsubscribe
completes. But if the leave request doesn't get a response in time
(unsubscribes fails quietly), and the response arrives after it, I expect the
joining could be overwritten (member updating it's joining epoch 0 to the -1
epoch received in the response)
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