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https://issues.apache.org/jira/browse/KAFKA-13810?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17520278#comment-17520278
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Luke Chen commented on KAFKA-13810:
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[~kspang_impala_76b0] , are you interested in submitting a PR to improve it?
> Document behavior of KafkaProducer.flush() w.r.t callbacks
> ----------------------------------------------------------
>
> Key: KAFKA-13810
> URL: https://issues.apache.org/jira/browse/KAFKA-13810
> Project: Kafka
> Issue Type: Improvement
> Reporter: Karsten Spang
> Priority: Major
>
> The javadoc (3.1.0) for KafkaProducer says
> {panel}
> The post-condition of {{flush()}} is that any previously sent record will
> have completed (e.g. {{{}Future.isDone() == true{}}}).
> {panel}
> It does not say anything about callbacks, though. It is not clear whether all
> callbacks have returned when {{flush()}} returns.
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