[jira] [Created] (KAFKA-15954) Review minimal effort approach on consumer last heartbeat on unsubscribe

["Lianet Magrans (Jira)" <ji...@apache.org>]

Lianet Magrans created KAFKA-15954:
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             Summary: Review minimal effort approach on consumer last heartbeat on unsubscribe
                 Key: KAFKA-15954
                 URL: https://issues.apache.org/jira/browse/KAFKA-15954
             Project: Kafka
          Issue Type: Task
          Components: clients, consumer
            Reporter: Lianet Magrans


Currently the legacy and new consumer follows a minimal effort approach when sending a leave group (legacy) or last heartbeat request (new consumer). The request is sent without waiting/handling any response. This behaviour applies when the consumer is being closed or when it unsubscribes.

For the case when the consumer is being closed, (which is a "terminal" state), it makes sense to just follow a minimal effort approach for "properly" leaving the group. But for the case of unsubscribe, it would maybe make sense to put a little more effort in making sure that the last heartbeat is sent and received by the broker. Note that unsubscribe could a temporary state, where the consumer might want to re-join the group at any time. 



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