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https://issues.apache.org/jira/browse/KAFKA-19468?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Schofield resolved KAFKA-19468.
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Resolution: Fixed
> Share group epoch increments on every heartbeat if subscribed topics removed
> ----------------------------------------------------------------------------
>
> Key: KAFKA-19468
> URL: https://issues.apache.org/jira/browse/KAFKA-19468
> Project: Kafka
> Issue Type: Sub-task
> Affects Versions: 4.1.0
> Reporter: Andrew Schofield
> Assignee: Andrew Schofield
> Priority: Major
> Fix For: 4.2.0
>
>
> If topics are removed from the set of subscribed topics for a share group,
> subsequent heartbeats will erroneously increment the group epoch thinking
> that outstanding state initialisations are present. The condition for
> incrementing the epoch is too strict.
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