@Override
    public Connection selectConnectionForGroup(final String group, final ConnectionSelector connectionSelector,
            final RequestCommand request) throws NotifyRemotingException {
        return this.remotingClient.selectConnectionForGroup(group, connectionSelector, request);
    }
Whether to enable loopback connection for metaq client, default is false.
metamorphosis-client/src/main/java/com/taobao/metamorphosis/client/RemotingClientWrapper.java