conf.setBoolean(Constants.CHECKPOINT_ENABLED, false);
int port = BSPNetUtils.getFreePort(5000);
InetSocketAddress inetAddress = new InetSocketAddress(port);
MinimalGroomServer groom = new MinimalGroomServer(conf);
Server workerServer = RPC.getServer(groom, inetAddress.getHostName(),
inetAddress.getPort(), conf);
workerServer.start();
LOG.info("Started RPC server");