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MINOR: Logs warning message when user invoke producer#flush within callback (#18112) 

Reviewers: Andrew Schofield <aschofield@confluent.io>
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TengYao Chi 2024-12-10 23:27:42 +08:00 committed by GitHub
parent b99c22770a
commit f57fd2d9fd
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8
clients/src/main/java/org/apache/kafka/clients/producer/KafkaProducer.java
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@ -1219,11 +1219,19 @@ public class KafkaProducer<K, V> implements Producer<K, V> {
* flush all buffered records before performing the commit. This ensures that all the {@link #send(ProducerRecord)}
* calls made since the previous {@link #beginTransaction()} are completed before the commit.
* </p>
* <p>
* <b>Important:</b> This method should not be used within the callback provided to
* {@link #send(ProducerRecord, Callback)}. Invoking <code>flush()</code> in this context will cause a deadlock.
* </p>
*
* @throws InterruptException If the thread is interrupted while blocked
*/
@Override
public void flush() {
if (Thread.currentThread() == this.ioThread) {
log.error("KafkaProducer.flush() invocation inside a callback will cause a deadlock.");
}
log.trace("Flushing accumulated records in producer.");
long start = time.nanoseconds();