xiaowangzhixiao commented on PR #4496:
URL: https://github.com/apache/hbase/pull/4496#issuecomment-1148175382
For example, when request hbase in a outer lock, process response in this
lock, and don't isolate the thread, it will cause deadlock. As the caller, we
shouldn't care the lock in the hbase client.
```
CompletableFuture<Result> getResult(get) {
....
lock.lock();
future = asyncTable.get(get);
lock.unlock();
return future;
...
}
...
getResult(get).handle((v,e)->{
lock.lock();
...
lock.unlock();
});
```
In getResult(), the order of lock is lock.lock() -> tableCache.lock(). But
when the regionLocation response have exception,
future.completeExceptionally(err) will trigger this future's handle action, and
the order of lock is tableCache.lock() -> lock.lock(). So it will cause
deadlock.
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