see more from https://github.com/openzipkin/brave/issues/867, also see https://github.com/apache/incubator-dubbo/issues/3576
@Deprecated
    public boolean isClientSide() {
        return isConsumerSide();
    }
    /**
     * @deprecated Replace to getUrls()
     */
    @Deprecated
    @SuppressWarnings({"unchecked", "rawtypes"})
    public List<Invoker<?>> getInvokers() {
        return invokers == null && invoker != null ? (List) Arrays.asList(invoker) : invokers;
    }
    public RpcContext setInvokers(List<Invoker<?>> invokers) {
        this.invokers = invokers;
        if (CollectionUtils.isNotEmpty(invokers)) {
            List<URL> urls = new ArrayList<URL>(invokers.size());
            for (Invoker<?> invoker : invokers) {
                urls.add(invoker.getUrl());
            }
            setUrls(urls);
        }
        return this;
    }
    /**
     * @deprecated Replace to getUrl()
     */
    @Deprecated
    public Invoker<?> getInvoker() {
        return invoker;
    }