code: public int exists(String pathInZooKeeper) throws Exception {
  		checkNotNull(pathInZooKeeper, "Path in ZooKeeper");
  
  		final String path = normalizePath(pathInZooKeeper);
  
  		Stat stat = client.checkExists().forPath(path);
  
  		if (stat != null) {
  			return stat.getVersion();
  		}
  
  		return -1;
  	}
docs: Returns the version of the node if it exists or <code>-1</code> if it doesn't.
  
  @param pathInZooKeeper Path in ZooKeeper to check
  @return Version of the ZNode if the path exists, <code>-1</code> otherwise.
  @throws Exception If the ZooKeeper operation fails