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https://issues.apache.org/jira/browse/KAFKA-8178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17013117#comment-17013117
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Matthias J. Sax commented on KAFKA-8178:
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KAFKA-3450 is also related
> KafkaProducer#send(ProducerRecord,Callback) may block for up to 60 seconds
> --------------------------------------------------------------------------
>
> Key: KAFKA-8178
> URL: https://issues.apache.org/jira/browse/KAFKA-8178
> Project: Kafka
> Issue Type: Bug
> Components: clients, producer
> Reporter: Sergei Egorov
> Priority: Major
>
> Hello. I was running reactor-kafka with [the BlockHound
> agent|https://github.com/reactor/BlockHound] (you can see the progress
> [here|https://github.com/reactor/reactor-kafka/pull/75] and even run it
> yourself) and it detected a very dangerous blocking call in
> KafkaProducer#send(ProducerRecord,Callback) which is supposed to be async:
> {code:java}
> java.lang.Error: Blocking call! java.lang.Object#wait
> at reactor.BlockHound$Builder.lambda$new$0(BlockHound.java:154)
> at reactor.BlockHound$Builder.lambda$install$8(BlockHound.java:254)
> at reactor.BlockHoundRuntime.checkBlocking(BlockHoundRuntime.java:43)
> at java.lang.Object.wait(Object.java)
> at org.apache.kafka.clients.Metadata.awaitUpdate(Metadata.java:181)
> at
> org.apache.kafka.clients.producer.KafkaProducer.waitOnMetadata(KafkaProducer.java:938)
> at
> org.apache.kafka.clients.producer.KafkaProducer.doSend(KafkaProducer.java:823)
> at
> org.apache.kafka.clients.producer.KafkaProducer.send(KafkaProducer.java:803)
> {code}
> it blocks for up to "maxBlockTimeMs" (60 seconds by default)
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