lordcheng10 opened a new issue #12197:
URL: https://github.com/apache/pulsar/issues/12197
**Describe the bug**
In the following example, the data will be lost:
` try {
PulsarClient client =
PulsarClient.builder().serviceUrl("pulsar://127.0.0.1:6650").build();
Producer<byte[]> producer =
client.newProducer().topic("test1").create();
producer.sendAsync("hello".getBytes());
client.close();
} catch (PulsarClientException e) {
e.printStackTrace();
}
Thread.sleep(1000);`
The reason is because the producer did not send the data in the client
buffer when it was closed;
The correct approach is to first flush data when closing。
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