Damian Guy created KAFKA-4881:
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Summary: 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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