@FeignClient(name = "api", fallbackFactory = LoadBalancingFallbackFactory.class)
public interface LoadBalancingFeignClient {

  @PostMapping(value = "/api/loadBalancing/server")
  Result currentServer();

}

@Slf4j
@Component
public class LoadBalancingFallbackFactory implements FallbackFactory<LoadBalancingFeignClient> {

  @Override
  public LoadBalancingFeignClient create(Throwable throwable) {
    final String msg = throwable.getMessage();
    return () -> {
      log.error("loadBalancingFeignClient currentServer into fallback. {}", msg);
      return Result.error();
    };****
  }

}

hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds = 3500
hystrix.threadpool.default.maxQueueSize = 60
hystrix.threadpool.default.queueSizeRejectionThreshold = 40

  private class HystrixContextSchedulerWorker extends Worker {

    private final Worker worker;

    private HystrixContextSchedulerWorker(Worker actualWorker) {
      this.worker = actualWorker;
    }

    @Override
    public void unsubscribe() {
      worker.unsubscribe();
    }

    @Override
    public boolean isUnsubscribed() {
      return worker.isUnsubscribed();
    }

    @Override
    public Subscription schedule(Action0 action, long delayTime, TimeUnit unit) {
      if (threadPool != null) {
        if (!threadPool.isQueueSpaceAvailable()) {
          throw new RejectedExecutionException("Rejected command because thread-pool queueSize is at rejection threshold.");
        }
      }
      return worker.schedule(new HystrixContexSchedulerAction(concurrencyStrategy, action), delayTime, unit);
    }

    @Override
    public Subscription schedule(Action0 action) {
      if (threadPool != null) {
        if (!threadPool.isQueueSpaceAvailable()) {
          throw new RejectedExecutionException("Rejected command because thread-pool queueSize is at rejection threshold.");
        }
      }
      return worker.schedule(new HystrixContexSchedulerAction(concurrencyStrategy, action));
    }

  }