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Posted to jira@kafka.apache.org by "Liraz Sharaby (Jira)" <ji...@apache.org> on 2020/06/21 10:59:00 UTC

[jira] [Resolved] (KAFKA-10183) MirrorMaker creates duplicate messages in target cluster

     [ https://issues.apache.org/jira/browse/KAFKA-10183?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Liraz Sharaby resolved KAFKA-10183.
-----------------------------------
    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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