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https://issues.apache.org/jira/browse/KAFKA-16624?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Igor Soarez resolved KAFKA-16624.
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Resolution: Fixed
> Don't generate useless PartitionChangeRecord on older MV
> --------------------------------------------------------
>
> Key: KAFKA-16624
> URL: https://issues.apache.org/jira/browse/KAFKA-16624
> Project: Kafka
> Issue Type: Bug
> Reporter: Colin McCabe
> Assignee: Colin McCabe
> Priority: Minor
>
> Fix a case where we could generate useless PartitionChangeRecords on metadata
> versions older than 3.6-IV0. This could happen in the case where we had an
> ISR with only one broker in it, and we were trying to go down to a fully
> empty ISR. In this case, PartitionChangeBuilder would block the record to
> going down to a fully empty ISR (since that is not valid in these pre-KIP-966
> metadata versions), but it would still emit the record, even though it had no
> effect.
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