private static void skipRecordHeader(final DataInputStream refs,
                                       final int expectedRecordTag,
                                       final int expectedFileId) throws IOException {
    int attId = DataInputOutputUtil.readINT(refs);// attrId
    assert attId == expectedRecordTag || expectedRecordTag == 0;
    int fileId = DataInputOutputUtil.readINT(refs);// fileId
    assert expectedFileId == fileId || expectedFileId == 0;
  }
private static void skipRecordHeader(final DataInputStream refs,
                                       final int expectedRecordTag,
                                       final int expectedFileId)