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From "Jiangjie Qin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-2397) leave group request
Date Mon, 03 Aug 2015 18:38:04 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-2397?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14652231#comment-14652231
] 

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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