tableScan.setStopRow(MessageID.toBytes(new MessageID(shard, partion, Integer.MAX_VALUE, Short.MAX_VALUE)));
tableScan.setMaxResultSize(10240);
tableScan.addColumn(MdrillQueue.FAMILY, MdrillQueue.FAMILYColumn);
tableScan.setBatch(10240);
tableScan.setCaching(1024);
clientScanner = new ClientScanner(conf, tableScan, queueName);
}