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https://issues.apache.org/jira/browse/KAFKA-19827?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Schofield resolved KAFKA-19827.
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Resolution: Fixed
> Call acknowledgement commit callback at end of waiting calls
> ------------------------------------------------------------
>
> Key: KAFKA-19827
> URL: https://issues.apache.org/jira/browse/KAFKA-19827
> Project: Kafka
> Issue Type: Sub-task
> Components: clients
> Affects Versions: 4.1.0
> Reporter: Andrew Schofield
> Assignee: Andrew Schofield
> Priority: Major
> Fix For: 4.2.0
>
>
> The acknowledgement commit callback in the share consumer gets called on the
> application thread at the start of the poll, commitSync and commitAsync
> methods. Specifically in the peculiar case of using the callback together
> with commitSync, the acknowledgement callback for the committed records is
> called at the start of the next eligible call, even though the information is
> already known at the end of the commitSync's execution. The results are
> correct already, but the timing could be improved in some situations.
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