ivandika3 commented on PR #9383:
URL: https://github.com/apache/ozone/pull/9383#issuecomment-3584879946
@chungen0126 Thanks for checking this out.
> I would like to ask if the new value can be null, and if so, what would
happens in that case?
From `ReconfigurableBase.ReconfigurationThread#run`, it if it's null, it
will unset the configuration.
```java
try {
String effectiveValue =
parent.reconfigurePropertyImpl(change.prop, change.newVal);
if (change.newVal != null) {
oldConf.set(change.prop, effectiveValue);
} else {
oldConf.unset(change.prop);
}
} catch (ReconfigurationException e) {
Throwable cause = e.getCause();
errorMessage = cause == null ? e.getMessage() : cause.getMessage();
}
```
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