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

["Richard Yu (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-8806?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16909445#comment-16909445 ] 

Richard Yu commented on KAFKA-8806:
-----------------------------------

[~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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