@Override
    public String toString() {
      return "DynamicServiceInstance [id=" + getWorkerIdentity() + ", host=" + getHost() + ":" + getRpcPort() +
          " with resources=" + getResource() + ", shufflePort=" + getShufflePort() +
          ", servicesAddress=" + getServicesAddress() +  ", mgmtPort=" + getManagementPort() + "]";
    }
A dynamically changing instance in an Llap Service. Can become inactive if failing or can be
blacklisted (set to 0 capacity) if too slow (See: BlacklistingLlapMetricsListener).
llap-client/src/java/org/apache/hadoop/hive/llap/registry/impl/LlapZookeeperRegistryImpl.java