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https://issues.apache.org/jira/browse/KAFKA-8806?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16909445#comment-16909445
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Richard Yu commented on KAFKA-8806:
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[~vvcephei] Since you wrote this part of the code, your thoughts on this?
> 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
> Assignee: David Arthur
> Priority: Major
>
> 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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