in flume-kafka-channel/src/main/java/org/apache/flume/channel/kafka/KafkaChannel.java [682:693]
public void onCompletion(RecordMetadata metadata, Exception exception) {
if (exception != null) {
log.trace("Error sending message to Kafka due to " + exception.getMessage());
}
if (log.isDebugEnabled()) {
long batchElapsedTime = System.currentTimeMillis() - startTime;
if (metadata != null) {
log.debug("Acked message_no " + index + ": " + metadata.topic() + "-" +
metadata.partition() + "-" + metadata.offset() + "-" + batchElapsedTime);
}
}
}