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https://issues.apache.org/jira/browse/KAFKA-3539?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15788664#comment-15788664
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Ewen Cheslack-Postava commented on KAFKA-3539:
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http://mail-archives.apache.org/mod_mbox/kafka-users/201604.mbox/%3C01978027-5580-4AAB-A254-3585870FBD69%40hortonworks.com%3E
is the original message that's the source of this issue.
> KafkaProducer.send() may block even though it returns the Future
> ----------------------------------------------------------------
>
> Key: KAFKA-3539
> URL: https://issues.apache.org/jira/browse/KAFKA-3539
> Project: Kafka
> Issue Type: Bug
> Reporter: Oleg Zhurakousky
> Assignee: Manikumar Reddy
> Priority: Critical
>
> You can get more details from the [email protected] by searching on the
> thread with the subject "KafkaProducer block on send".
> The bottom line is that method that returns Future must never block, since it
> essentially violates the Future contract as it was specifically designed to
> return immediately passing control back to the user to check for completion,
> cancel etc.
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