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https://issues.apache.org/jira/browse/KAFKA-10086?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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John Roesler resolved KAFKA-10086.
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Resolution: Fixed
> Standby state isn't always re-used when transitioning to active
> ---------------------------------------------------------------
>
> Key: KAFKA-10086
> URL: https://issues.apache.org/jira/browse/KAFKA-10086
> Project: Kafka
> Issue Type: Task
> Components: streams
> Affects Versions: 2.6.0, 2.7.0
> Reporter: John Roesler
> Assignee: John Roesler
> Priority: Blocker
> Fix For: 2.6.0, 2.7.0
>
>
> This ticket was initially just to write an integration test, but I escalated
> it to a blocker and changed the title when the integration test actually
> surfaced two bugs:
> # Offset positions were not reported for in-memory stores, so tasks with
> in-memory stores would never be considered as "caught up" and could not take
> over active processing, preventing clusters from ever achieving balance. This
> is a regression in 2.6
> # When the TaskAssignor decided to switch active processing from a former
> owner to a new one that had a standby, the lower-level cooperative rebalance
> protocol would first de-schedule the task completely, and only later would
> assign it to the new owner. For in-memory stores, this causes the standby
> state not to be re-used, and for persistent stores, it creates a window in
> which the cleanup thread might delete the state directory. In both cases,
> even though the instance previously had a standby, once it gets the active,
> it still had to restore the entire state from the changelog.
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