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Posted to dev@kafka.apache.org by "Jason Gustafson (Jira)" <ji...@apache.org> on 2020/04/29 19:54:00 UTC

[jira] [Created] (KAFKA-9939) Fetch request metrics are updated twice for delayed fetches

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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