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https://issues.apache.org/jira/browse/KAFKA-4881?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15943689#comment-15943689
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ASF GitHub Bot commented on KAFKA-4881:
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Github user asfgit closed the pull request at:
https://github.com/apache/kafka/pull/2650
> Add internal leave.group.on.close config to consumer
> -----------------------------------------------------
>
> Key: KAFKA-4881
> URL: https://issues.apache.org/jira/browse/KAFKA-4881
> Project: Kafka
> Issue Type: New Feature
> Components: clients
> Reporter: Damian Guy
> Assignee: Damian Guy
> Fix For: 0.11.0.0
>
>
> In streams we need to reduce the number of rebalances as they cause expensive
> shuffling of state during {{onPartitionsAssigned}} and
> {{onPartitionsRevoked}}. To achieve this we can choose to not send leave the
> group when a streams consumer is closed. This means that during bounces (with
> appropriate session timeout settings) we will see at most one rebalance per
> instance bounce.
> As this is an optimization that is only relevant to streams at the moment,
> initially we will do this by adding an internal config to the consumer
> {{leave.group.on.close}}, this will default to true. When it is set to false
> {{AbstractCoordinator}} won't send the {{LeaveGroupRequest}}
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