@Override
    public Map<Connection, ResponseCommand> invokeToGroupAllConnections(final String group, final RequestCommand command)
            throws InterruptedException, NotifyRemotingException {
        return this.remotingClient.invokeToGroupAllConnections(group, command);
    }
Whether to enable loopback connection for metaq client, default is false.
metamorphosis-client/src/main/java/com/taobao/metamorphosis/client/RemotingClientWrapper.java