Sergei Egorov created KAFKA-8178:
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Summary: 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
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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