public void serviceStart() {
try {
Configuration conf = getConfig();
InetSocketAddress addr = new InetSocketAddress(0);
DAGClientAMProtocolBlockingPBServerImpl service =
new DAGClientAMProtocolBlockingPBServerImpl(realInstance);
BlockingService blockingService =
DAGClientAMProtocol.newReflectiveBlockingService(service);
int numHandlers = conf.getInt(TezConfiguration.TEZ_AM_CLIENT_THREAD_COUNT,