gaozhangmin opened a new pull request, #4018:
URL: https://github.com/apache/bookkeeper/pull/4018
### Motivation
This code snippet implements disk check event trigger if disk usage is
above warnThreshold, either marjor is suspend or forcegc is enabled.
There exists a case that if usgae descends to warn threshold, the gc thread
is suspend forever. until it goes to full and becomes writable again.
```
@Override
public void diskAlmostFull(File disk) {
if (gcThread.isForceGCAllowWhenNoSpace) {
gcThread.enableForceGC();
} else {
gcThread.suspendMajorGC();
}
}
```
### Changes
Add diskUnderWarnThreshold check event to prevent gcThread supended forever
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