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https://issues.apache.org/jira/browse/KAFKA-2747?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Geoff Anderson resolved KAFKA-2747.
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Resolution: Not A Problem
> Message loss if mirror maker is killed with hard kill and then restarted
> ------------------------------------------------------------------------
>
> Key: KAFKA-2747
> URL: https://issues.apache.org/jira/browse/KAFKA-2747
> Project: Kafka
> Issue Type: Bug
> Reporter: Geoff Anderson
>
> I recently added simple failover to the existing mirror maker test
> (https://github.com/apache/kafka/pull/427) and found that killing mirror
> maker process with a hard kill resulted in message loss.
> The test here has two single-node broker clusters, one producer producing to
> the source cluster, one consumer consuming from the target cluster, and a
> single mirror maker instance mirroring data between the two clusters.
> mirror maker is using old consumer, zookeeper for offset storage
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