}
@Override
public UpgradeCommand processUpgradeCommand(UpgradeCommand comm)
throws IOException {
ProcessUpgradeRequestProto req = ProcessUpgradeRequestProto.newBuilder()
.setCmd(PBHelper.convert(comm)).build();
ProcessUpgradeResponseProto resp;
try {
resp = rpcProxy.processUpgrade(NULL_CONTROLLER, req);
} catch (ServiceException se) {