  int Bind(const Node& node, int max_retry) override {
    receiver_ = zmq_socket(context_, ZMQ_ROUTER);
    CHECK(receiver_ != NULL)
        << "create receiver socket failed: " << zmq_strerror(errno);
    int local = GetEnv("DMLC_LOCAL", 0);
    std::string addr = local ? "ipc:///tmp/" : "tcp://*:";
    int port = node.port;
    unsigned seed = static_cast<unsigned>(time(NULL)+port);
    for (int i = 0; i < max_retry+1; ++i) {
      auto address = addr + std::to_string(port);
      if (zmq_bind(receiver_, address.c_str()) == 0) break;
      if (i == max_retry) {
        port = -1;
      } else {
        port = 10000 + rand_r(&seed) % 40000;
      }
    }
    return port;
  }
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