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https://issues.apache.org/jira/browse/KAFKA-15548?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lucas Brutschy resolved KAFKA-15548.
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Resolution: Fixed
> Send GroupConsumerHeartbeatRequest on Consumer.close()
> ------------------------------------------------------
>
> Key: KAFKA-15548
> URL: https://issues.apache.org/jira/browse/KAFKA-15548
> Project: Kafka
> Issue Type: Sub-task
> Components: clients, consumer
> Reporter: Philip Nee
> Assignee: Philip Nee
> Priority: Major
> Labels: consumer-threading-refactor, kip-848-client-support,
> kip-848-e2e, kip-848-preview
>
> Upon closing of the {{Consumer}} we need to send the last
> GroupConsumerHeartbeatRequest with epoch = -1 to leave the group (or -2 if
> static member). There is a mechanism introduced in PR
> [14406|https://github.com/apache/kafka/pull/14406] that allows for performing
> network I/O on shutdown. The new method
> {{ConsumerNetworkThread.runAtClose()}} will be executed when
> {{Consumer.close()}} is invoked.
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