Mickael Maison created KAFKA-9175:
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Summary: 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
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!
The topic spp.hello is not receiving any records 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. 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
monitoring MirrorMaker 2.
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