final Filter filter = new Filter(HaWorkVO.class, null, true, 0l, 1l);
txn.start();
final List<HaWorkVO> vos = lockRows(sc, filter, true);
if (vos.size() == 0) {
txn.commit();
return null;
}
final HaWorkVO work = vos.get(0);
work.setServerId(serverId);