zifengmo commented on issue #21557:
URL: https://github.com/apache/pulsar/issues/21557#issuecomment-1818118000
> BTW, the messages will be packaged as a batched message if you enabled
`enableBatching`(default value is `true`)
The code of the producer builder:
private Producer getProducer(String topic) throws PulsarClientException {
Producer producer = producerMap.get(topic);
if (producer != null) {
return producer;
}
producerCreationLock.lock();
try {
producer = producerMap.get(topic);
if (producer == null) {
producer = pulsarClient.newProducer()
.sendTimeout(3, TimeUnit.SECONDS)
.enableBatching(false)
.topic(topic)
.messageRoutingMode(MessageRoutingMode.CustomPartition).messageRouter(new
MessageRouter() {
@Override
public int choosePartition(Message<?> message,
TopicMetadata metadata) {
int topicPartitionNum =
metadata.numPartitions();
int keyHashCode =
message.getKey().hashCode();
if (keyHashCode == Integer.MIN_VALUE) {
keyHashCode = topicPartitionNum - 1;
}
return Math.abs(keyHashCode) %
topicPartitionNum;
}
}).create();
producerMap.put(topic, producer);
}
} finally {
producerCreationLock.unlock();
}
return producer;
}
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