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https://issues.apache.org/jira/browse/KAFKA-15102?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17741402#comment-17741402
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Omnia Ibrahim commented on KAFKA-15102:
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I opened this small KIP to fix this
[https://cwiki.apache.org/confluence/display/KAFKA/KIP-949%3A+Add+flag+to+enable+the+usage+of+topic+separator+in+MM2+DefaultReplicationPolicy]
> 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
> Assignee: Omnia Ibrahim
> 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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