Jason Gustafson created KAFKA-9939:
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Summary: Fetch request metrics are updated twice for delayed
fetches
Key: KAFKA-9939
URL: https://issues.apache.org/jira/browse/KAFKA-9939
Project: Kafka
Issue Type: Bug
Reporter: Jason Gustafson
Assignee: Jason Gustafson
We track fetch request rate metrics in `BrokerTopicStats`. We have both topic
level and total metrics. Currently these values are updated in
`ReplicaManager.readFromLocalLog`. Inside `fetchMessages`, we invoke
`readFromLocalLog` first to see if the fetch can be immediately satisfied. If
not, then we put it in purgatory. After completing purgatory, we make a second
call to `readFromLocalLog` which will again update the request rate metrics.
Hence we are overcounting the fetch request rate.
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