@Override
  public FileInStream openFile(AlluxioURI path, OpenFilePOptions options)
      throws FileDoesNotExistException, OpenDirectoryException, FileIncompleteException,
      IOException, AlluxioException {
    URIStatus status = getStatus(path,
        FileSystemOptionsUtils.getStatusDefaults(mFsContext.getClusterConf()).toBuilder()
            .setAccessMode(Bits.READ)
            .setUpdateTimestamps(options.getUpdateLastAccessTime())
            .build());
    return mDelegatedFileSystem.openFile(status, options);
  }
@Test
  public void openFile() throws Exception {
    mFs.openFile(FILE);
    assertEquals(1, mRpcCountingFs.getStatusRpcCount(FILE));
    mFs.openFile(FILE);
    assertEquals(1, mRpcCountingFs.getStatusRpcCount(FILE));
  }