code: private static String[] decodeKey(Key k) {
      String s = new String((k.isChunkKey()) ? Arrays.copyOfRange(k._kb, Vec.KEY_PREFIX_LEN, k._kb.length):k._kb);
      return decode(s);
    }
docs: Split key name composed of tachyon://<client-uri>/filename into two parts:
  - client-uri without tachyon:// prefix
  - filename
  And returns both components.