StephanEwen commented on a change in pull request #12151:
URL: https://github.com/apache/flink/pull/12151#discussion_r425134302
##########
File path:
flink-connectors/flink-connector-kafka-0.11/src/main/java/org/apache/flink/streaming/connectors/kafka/internal/FlinkKafkaProducer.java
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@@ -190,17 +192,19 @@ public void sendOffsetsToTransaction(Map<TopicPartition,
OffsetAndMetadata> offs
@Override
public void close() {
- closed = true;
synchronized (producerClosingLock) {
kafkaProducer.close();
+ LOG.debug("Closed internal KafkaProducer {}.
Stacktrace: {}", System.identityHashCode(this),
Joiner.on("\n").join(Thread.currentThread().getStackTrace()));
Review comment:
This uses eager string concatenation in a lazy parameter, which is
typically a blocker.
Now, this is not a performance critical path, but I would still suggest to
avoid this, because it sets a bad example for other contributors to immitate
(in then more critical parts).
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