lhotari opened a new issue #9564:
URL: https://github.com/apache/pulsar/issues/9564
**Describe the bug**
Topic auto-creation fails due to a race condition. This seems to happen to
be one of the issues causing flakiness in PulsarFunctionLocalRunTest, reported
as #8720 .
**To Reproduce**
```
@Test
public void shouldNotPreventCreatingTopicWhenNonexistingTopicIsCached()
throws Exception {
// run multiple iterations to increase the chance of reproducing a
race condition in the topic cache
for (int i=0; i < 100; i++) {
final String topicName =
"persistent://prop/ns-abc/topic-caching-test-topic" + i;
CountDownLatch latch = new CountDownLatch(1);
Thread getStatsThread = new Thread(() -> {
try {
latch.countDown();
// create race condition with a short delay
// the bug might not reproduce in all environments, this
works at least on i7-10750H CPU
Thread.sleep(1);
admin.topics().getStats(topicName);
fail("The topic should not exist yet.");
} catch (PulsarAdminException.NotFoundException e) {
// expected exception
} catch (PulsarAdminException | InterruptedException e) {
e.printStackTrace();
}
});
getStatsThread.start();
latch.await();
@Cleanup
Producer<byte[]> producer =
pulsarClient.newProducer().topic(topicName).create();
assertNotNull(producer);
getStatsThread.join();
}
}
```
**Expected behavior**
A topic should get created when topic auto-creation is enabled.
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