@Override
    public String toString() {
      return "FixedServiceInstance{" +
          "host=" + host +
          ", memory=" + memory +
          ", vcores=" + vcores +
          '}';
    }
A single instance in an Llap Service.
llap-client/src/java/org/apache/hadoop/hive/llap/registry/impl/LlapFixedRegistryImpl.java