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Posted to dev@kafka.apache.org by "Xavier Léauté (JIRA)" <ji...@apache.org> on 2019/08/14 23:03:00 UTC

[jira] [Created] (KAFKA-8806) Kafka.poll spends significant amount of time in KafkaConsumer.updateAssignmentMetadataIfNeeded

Xavier Léauté created KAFKA-8806:
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             Summary: Kafka.poll spends significant amount of time in KafkaConsumer.updateAssignmentMetadataIfNeeded
                 Key: KAFKA-8806
                 URL: https://issues.apache.org/jira/browse/KAFKA-8806
             Project: Kafka
          Issue Type: Bug
    Affects Versions: 2.3.0
            Reporter: Xavier Léauté


Comparing the performance profile of 2.2.0 and 2.3.0, we are seeing significant performance differences in the {{KafkaConumer.updateAssignmentMetadataIfNeeded()}} method.

The call to {{KafkaConsumer.updateAssignmentMetadataIfNeeded()}} now represents roughly 40% of CPU time spent in {{KafkaConsumer.poll()}}, when before it only represented less than 2%.

Most of the extra time appears to be spent in {{KafkaConsumer.validateOffsetsIfNeeded()}}, which did not show up in previous profiles.



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