public static <T> Optional<T> quietlyEval(String action,
      String path,
      CallableRaisingIOE<T> operation) {
    try {
      return Optional.of(once(action, path, operation));
    } catch (Exception e) {
      LOG.debug("Action {} failed", action, e);
      return Optional.empty();
    }
  }
@Test
  public void testQuietlyVoid() {
    quietlyEval("", "",
        () -> {
        throw HADOOP_CONNECTION_TIMEOUT_EX;
      });
  }