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https://issues.apache.org/jira/browse/KAFKA-9175?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mickael Maison resolved KAFKA-9175.
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Fix Version/s: 2.4.0
Resolution: Fixed
> MirrorMaker 2 emits invalid topic partition metrics
> ---------------------------------------------------
>
> Key: KAFKA-9175
> URL: https://issues.apache.org/jira/browse/KAFKA-9175
> Project: Kafka
> Issue Type: Bug
> Components: KafkaConnect
> Affects Versions: 2.4.0
> Reporter: Mickael Maison
> Assignee: Mickael Maison
> Priority: Blocker
> Fix For: 2.4.0
>
> Attachments: image-2019-11-12-17-42-45-773.png
>
>
> While looking at MirrorMaker 2 metrics with [~ecomar], we noticed the topic
> partition metrics were invalid.
> !image-2019-11-12-17-42-45-773.png|width=822,height=615!
> There is no traffic on the topic spp.hello but its metrics are constantly
> updating.
> The issue is in {{MirrorMetrics.PartitionMetrics}}. In the constructor,
> Sensors are built using {{metrics.sensor()}} with a name that does not
> include the topic partition. The method {{metrics.sensor()}} does not always
> create a new Sensor but can return an existing Sensor if one exists for the
> specified name. So in practice, if a Task is handling many topic partitions,
> they all share the same Sensors!
> This renders the topic partition metrics unusable and really prevents running
> MirrorMaker 2 in a production environment.
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