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https://issues.apache.org/jira/browse/KAFKA-18634?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Jacot resolved KAFKA-18634.
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Resolution: Fixed
> Fix ELR metadata version issues
> -------------------------------
>
> Key: KAFKA-18634
> URL: https://issues.apache.org/jira/browse/KAFKA-18634
> Project: Kafka
> Issue Type: Bug
> Reporter: Colin McCabe
> Assignee: Calvin Liu
> Priority: Blocker
> Fix For: 4.0.0
>
>
> Fix several ELR metadata version issues for 4.0
> - Several places in the code just check MetadataVersion.isElrSupported rather
> than looking at whether the eligible.leader.replicas.version feature is
> enabled. We need to check the feature and not do ELR stuff when ELR is turned
> off.
> - The comment for MetadataVersion.IBP_4_0_IV1 should say which metadata
> records changed. Specifically, PartitionRecord, PartitionChangeRecord. It
> should also mention that ClearElrRecord was added in this MV.
> - IBP_4_0_IV1 needs to be marked as stable.
> We also need to decide if ELR turned on will be the default in 4.0 for new
> clusters, or an opt-in.
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