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https://issues.apache.org/jira/browse/KAFKA-2397?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14652231#comment-14652231
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Jiangjie Qin commented on KAFKA-2397:
-------------------------------------
I would prefer extending heartbeat to indicate leaving group. And there will
always a be a delay for up to 1/3 of session timeout for the rebalance to be
triggered on all the consumers in the group given the broker always trigger
rebalance on heartbeat response. That is probably fine.
> leave group request
> -------------------
>
> Key: KAFKA-2397
> URL: https://issues.apache.org/jira/browse/KAFKA-2397
> Project: Kafka
> Issue Type: Sub-task
> Components: consumer
> Reporter: Onur Karaman
> Assignee: Onur Karaman
> Priority: Minor
> Fix For: 0.8.3
>
>
> Let's say every consumer in a group has session timeout s. Currently, if a
> consumer leaves the group, the worst case time to stabilize the group is 2s
> (s to detect the consumer failure + s for the rebalance window). If a
> consumer instead can declare they are leaving the group, the worst case time
> to stabilize the group would just be the s associated with the rebalance
> window.
> This is a low priority optimization!
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