@Override
  protected Scheduler scheduler() {
    return Scheduler.newFixedDelaySchedule(2, 2, TimeUnit.MINUTES);
  }
{@inheritDoc}
<p/>
Returns a schedule that starts after 2 minute and runs every 2 minutes
after {@link #runOneIteration()} completes.
ambari-server/src/main/java/org/apache/ambari/server/state/services/AlertNoticeDispatchService.java