coderzc commented on PR #21917:
URL: https://github.com/apache/pulsar/pull/21917#issuecomment-1899476607
@thetumbled @codelipenghui The following test can reproduce the problem, and
this PR can fix it.
```java
@Test
public void testWithCompactedOut() throws Exception {
String topicName =
"persistent://my-property/use/my-ns/testWithCompactedOut";
@Cleanup
Producer<String> producer = pulsarClient.newProducer(Schema.STRING)
.enableBatching(true).topic(topicName).batchingMaxMessages(3).create();
producer.newMessage().key("K1").value("V1").sendAsync();
producer.newMessage().key("K2").value("V2").sendAsync();
producer.newMessage().key("K2").value(null).sendAsync();
producer.flush();
admin.topics().triggerCompaction(topicName);
Awaitility.await().untilAsserted(() -> {
assertEquals(admin.topics().compactionStatus(topicName).status,
LongRunningProcessStatus.Status.SUCCESS);
});
producer.newMessage().key("K1").value(null).sendAsync();
producer.flush();
admin.topics().triggerCompaction(topicName);
Awaitility.await().untilAsserted(() -> {
assertEquals(admin.topics().compactionStatus(topicName).status,
LongRunningProcessStatus.Status.SUCCESS);
});
@Cleanup
Reader<String> reader = pulsarClient.newReader(Schema.STRING)
.subscriptionName("reader-test")
.topic(topicName)
.readCompacted(true)
.startMessageId(MessageId.earliest)
.create();
Assert.assertEquals(reader.getLastMessageIds().get(0),
MessageIdImpl.earliest);
while (reader.hasMessageAvailable()) {
Message<String> message = reader.readNext(3, TimeUnit.SECONDS);
Assert.assertNotNull(message);
}
}
```
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