[jira] [Commented] (KAFKA-4881) Add internal leave.group.on.close config to consumer

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-4881?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15943689#comment-15943689 ] 

ASF GitHub Bot commented on KAFKA-4881:
---------------------------------------

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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