315157973 opened a new pull request #8475:
URL: https://github.com/apache/pulsar/pull/8475
```java
private void createSystemTopicFactoryIfNeeded() {
if (namespaceEventsSystemTopicFactory == null) {
synchronized (this) {
if (namespaceEventsSystemTopicFactory == null) {
try {
namespaceEventsSystemTopicFactory = new
NamespaceEventsSystemTopicFactory(pulsarService.getClient());
} catch (PulsarServerException e) {
log.error("Create namespace event system topic
factory error.", e);
}
}
}
}
}
```
The creation of `namespaceEventsSystemTopicFactory` uses double-check
locking, but does not add volatile
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