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https://issues.apache.org/jira/browse/KAFKA-10183?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Liraz Sharaby resolved KAFKA-10183.
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Resolution: Done
Increasing max.tasks seems to have resolved the issue.
As per documentation example, our max.tasks was set to 1.
> MirrorMaker creates duplicate messages in target cluster
> --------------------------------------------------------
>
> Key: KAFKA-10183
> URL: https://issues.apache.org/jira/browse/KAFKA-10183
> Project: Kafka
> Issue Type: Bug
> Components: mirrormaker
> Affects Versions: 2.4.0, 2.5.0
> Environment: Centos7.7
> Reporter: Liraz Sharaby
> Priority: Major
>
> Issue: Mirror maker creates a consumer-producer pair per server listed in
> bootstrap.servers (mirrormaker config), resulting in duplicate messages in
> target cluster.
> When specifying 3 bootstrap servers, target topic will have 3 times the
> messages its source does.
> When specifying a single bootstrap server, only 1 consumer-producer pair is
> created, and message count is identical in source and target topics.
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