Zookeeper.sync() behavior

[Keith Turner]

I have read some documentation about Zookeeper.sync() that makes me
think there is no need to wait on its callback before reading data,
but its not explicitly stated in what I have read. I am wondering if
the following code is a reasonable way to get the latest data for
'/a/b'?

  ZooKeeper zooKeeper = null;

  AsyncCallback.VoidCallback cb;
  CompletableFuture<Integer> returnCode = new CompletableFuture<>();
  zooKeeper.sync("/a/b", (rc, path, ctx) -> returnCode.complete(rc), null);
  zooKeeper.getData("/a/b",false, null);
  if(returnCode.get() != 0) {
    //handle problem with sync
  }

Thanks

Keith