@Override
    public int hashCode() {
      int result = id.hashCode();
      result = 31 * result + requestId.hashCode();
      result = 31 * result + (hostName != null ? hostName.hashCode() : 0);
      return result;
    }
Contains info about request update. This update will be sent to all subscribed recipients.
ambari-server/src/main/java/org/apache/ambari/server/events/RequestUpdateEvent.java