hfutatzhanghb opened a new pull request, #6434:
URL: https://github.com/apache/hadoop/pull/6434
### Description of PR
In method FSEditLogAsync#enqueueEdit , there exist the below codes:
```java
if (Thread.holdsLock(this)) {
// if queue is full, synchronized caller must immediately
relinquish
// the monitor before re-offering to avoid deadlock with sync
thread
// which needs the monitor to write transactions.
int permits = overflowMutex.drainPermits();
try {
do {
this.wait(1000); // will be notified by next logSync.
} while (!editPendingQ.offer(edit));
} finally {
overflowMutex.release(permits);
}
}
```
It maybe invoke this.wait(1000) without having object this's monitor.
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