Bob Barrett created KAFKA-9788:
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Summary: Sensor name collision for group and transaction
coordinator load metrics
Key: KAFKA-9788
URL: https://issues.apache.org/jira/browse/KAFKA-9788
Project: Kafka
Issue Type: Bug
Reporter: Bob Barrett
Assignee: Bob Barrett
Both the group coordinator and the transaction coordinator create a Sensor
object on startup to track the time it takes to load partitions, and both name
the Sensor "PartitionLoadTime":
[https://github.com/apache/kafka/blob/trunk/core/src/main/scala/kafka/coordinator/transaction/TransactionStateManager.scala#L98]
[https://github.com/apache/kafka/blob/trunk/core/src/main/scala/kafka/coordinator/group/GroupMetadataManager.scala#L92]
However, Sensor names are meant to be unique. This name collision means that
there is actually only one underlying "PartitionLoadTime" Sensor per broker,
which is marked for each partition loaded by either coordinator, resulting in
the metrics for group and transaction partition loading to be identical, and
based the combination of each data set. These should be renamed to allow
distinguishing between the two coordinator types.
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