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https://issues.apache.org/jira/browse/KAFKA-16372?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17828960#comment-17828960
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Haruki Okada commented on KAFKA-16372:
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[~showuon] Agreed.
One concern is, IMO many developers expect this "exception thrown on buffer
full after max.block.ms"-behavior (because it's stated in Javadoc while we
rarely hit buffer-full situation so no one realized this discrepancy).
Even some famous open-sources have exception-handling code which doesn't work
actually due to this. (e.g.
[logback-kafka-append|https://github.com/danielwegener/logback-kafka-appender/blob/master/src/main/java/com/github/danielwegener/logback/kafka/delivery/AsynchronousDeliveryStrategy.java#L29])
I wonder if just fixing Javadoc and Kafka documentation is fine, or we should
include a heads up about this somewhere (e.g. at Kafka user mailing list).
I would like to hear committer's opinion.
Anyways, meanwhile let me start fixing the docs.
> max.block.ms behavior inconsistency with javadoc and the config description
> ---------------------------------------------------------------------------
>
> Key: KAFKA-16372
> URL: https://issues.apache.org/jira/browse/KAFKA-16372
> Project: Kafka
> Issue Type: Bug
> Components: producer
> Reporter: Haruki Okada
> Priority: Minor
>
> As of Kafka 3.7.0, the javadoc of
> [KafkaProducer.send|https://github.com/apache/kafka/blob/3.7.0/clients/src/main/java/org/apache/kafka/clients/producer/KafkaProducer.java#L956]
> states that it throws TimeoutException when max.block.ms is exceeded on
> buffer allocation or initial metadata fetch.
> Also it's stated in [buffer.memory config
> description|https://kafka.apache.org/37/documentation.html#producerconfigs_buffer.memory].
> However, I found that this is not true because TimeoutException extends
> ApiException, and KafkaProducer.doSend catches ApiException and [wraps it as
> FutureFailure|https://github.com/apache/kafka/blob/3.7.0/clients/src/main/java/org/apache/kafka/clients/producer/KafkaProducer.java#L1075-L1086]
> instead of throwing it.
> I wonder if this is a bug or the documentation error.
> Seems this discrepancy exists since 0.9.0.0, which max.block.ms is introduced.
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