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

["Kirk True (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-15954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17887250#comment-17887250 ] 

Kirk True commented on KAFKA-15954:
-----------------------------------

[~lianetm]—Same here—is this going into 4.0.0?

> 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: Sub-task
>          Components: clients, consumer
>            Reporter: Lianet Magrans
>            Assignee: Lianet Magrans
>            Priority: Minor
>              Labels: kip-848-client-support, reconciliation
>             Fix For: 4.0.0
>
>
> 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 probably makes sense to just follow a minimal effort approach for "properly" leaving the group (no retry logic). But for the case of unsubscribe, we could consider if valuable to to put a little more effort into making sure that the last heartbeat is sent and received by the broker (ex. what if coordinator not known/available when sending the last HB). Note that unsubscribe could a temporary state, where the consumer might want to re-join the group at any time. 



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