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https://issues.apache.org/jira/browse/KAFKA-6705?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16410765#comment-16410765
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Ismael Juma commented on KAFKA-6705:
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[~lindong], there's a long-standing Jira about this, it may be worth searching
for it. One reason why the current interface blocks is to provide back-pressure
in case you have exhausted the buffer pool. If `send` is completely
non-blocking, then this would no longer be possible. In any case, feel free to
add your thoughts on the original JIRA.
> producer.send() should be non-blocking
> --------------------------------------
>
> Key: KAFKA-6705
> URL: https://issues.apache.org/jira/browse/KAFKA-6705
> Project: Kafka
> Issue Type: Improvement
> Reporter: Dong Lin
> Assignee: Dong Lin
> Priority: Major
>
> Currently producer.send() may block on metadata or full buffer for up to
> max.block.ms. This behavior is well documented but it is a bit sub-optimal.
> Since we return a future we should be able to make producer.send() completely
> non-blocking. One idea is to simply insert the record into a global queue
> shared across all partitions, and let the sender thread fetch record from
> this queue and send to broker.
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