code: public byte[] getDataRaw(String path) throws ZooKeeperException {
          try {
              byte[] data = getFromCache(cacheNameRaw, path, byte[].class);
              if (data == null) {
                  data = _readRaw(path);
                  putToCache(cacheNameRaw, path, data);
              }
              return data;
          } catch (ZooKeeperException.NodeNotFoundException e) {
              return null;
          } catch (Exception e) {
              if (e instanceof ZooKeeperException) {
                  throw (ZooKeeperException) e;
              } else {
                  throw new ZooKeeperException(e);
              }
          }
      }
docs: Reads raw data from a node.
  
  @param path
  @return
  @throws ZooKeeperException