@VisibleForTesting
  public int getContainersFailedRetrieved() {
    return numGetContainersFailedRetrieved.value();
  }
@Test
  public void testGetContainersFailed() {
    long totalBadBefore = metrics.getContainersFailedRetrieved();
    badSubCluster.getContainers();
    Assert.assertEquals(totalBadBefore + 1, metrics.getContainersFailedRetrieved());
  }