code: private StorageObjectsChunk getObjectListingChunk(String key, String delimiter,
        String priorLastKey) {
      StorageObjectsChunk res;
      try {
        res = mClient.listObjectsChunked(mBucketName, key, delimiter,
            getListingChunkLength(mAlluxioConf), priorLastKey);
      } catch (ServiceException e) {
        LOG.error("Failed to list path {}", key, e);
        res = null;
      }
      return res;
    }
docs: Get next chunk of listing result.