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https://issues.apache.org/jira/browse/KAFKA-19710?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Nicholas Telford resolved KAFKA-19710.
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Resolution: Fixed
> Add downgrade support
> ---------------------
>
> Key: KAFKA-19710
> URL: https://issues.apache.org/jira/browse/KAFKA-19710
> Project: Kafka
> Issue Type: Sub-task
> Components: streams
> Reporter: Nicholas Telford
> Assignee: Nicholas Telford
> Priority: Major
>
> {{RocksDbStateStore#close}} will need to detect when {{upgrade.from}} is set
> to a version that doesn't support offsets, and downgrade by porting them out
> to {{.checkpoint}} and removing the column family.
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