@Override
    public void sendToGroupAllConnections(final String group, final RequestCommand command,
            final GroupAllConnectionCallBackListener listener) throws NotifyRemotingException {
        this.remotingClient.sendToGroupAllConnections(group, command, listener);
    }
Whether to enable loopback connection for metaq client, default is false.
metamorphosis-client/src/main/java/com/taobao/metamorphosis/client/RemotingClientWrapper.java