return subcollections.containsKey(name);
return subcollections.contains(name);
	public boolean hasSubcollection(String name) {		Lock lock = db.getLock();		try {			lock.acquire(Lock.READ_LOCK);			return subcollections.containsKey(name);		} catch (LockException e) {			LOG.warn(e.getMessage(), e);			return subcollections.containsKey(name);		} finally {			lock.release();		}	}