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https://issues.apache.org/jira/browse/KAFKA-15102?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17739146#comment-17739146
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Chris Egerton commented on KAFKA-15102:
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[~omnia_h_ibrahim] Good call đź‘Ť we should definitely update the compatibility
section in the KIP to mention this. We may also want list the affected versions
and link to this issue for further context.
> Mirror Maker 2 - KIP690 backward compatibility
> ----------------------------------------------
>
> Key: KAFKA-15102
> URL: https://issues.apache.org/jira/browse/KAFKA-15102
> Project: Kafka
> Issue Type: Bug
> Components: mirrormaker
> Affects Versions: 3.1.0
> Reporter: David Dufour
> Priority: Major
>
> According to KIP690, "When users upgrade an existing MM2 cluster they don’t
> need to change any of their current configuration as this proposal maintains
> the default behaviour for MM2."
> Now, the separator is subject to customization.
> As a consequence, when an MM2 upgrade is performed, if the separator was
> customized with replication.policy.separator, the name of this internal topic
> changes. It then generates issues like:
> Caused by: java.util.concurrent.ExecutionException:
> org.apache.kafka.common.errors.InvalidTopicException: Topic
> 'mm2-offset-syncs_bkts28_internal' collides with existing topics:
> mm2-offset-syncs.bkts28.internal
> It has been observed that the replication can then be broken sometimes
> several days after the upgrade (reason not identified). By deleting the old
> topic name, it recovers.
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