@Override
  public void addRequestExecution(RequestExecution requestExecution) throws AmbariException {
    LOG.info("Adding a new request schedule" + ", clusterName = " + getClusterName() + ", id = "
        + requestExecution.getId() + ", description = " + requestExecution.getDescription());

    if (requestExecutions.containsKey(requestExecution.getId())) {
      LOG.debug("Request schedule already exists, clusterName = {}, id = {}, description = {}",
        getClusterName(), requestExecution.getId(), requestExecution.getDescription());
    } else {
      requestExecutions.put(requestExecution.getId(), requestExecution);
    }
  }
Make sure we load all the service host components.
We need this for live status checks.
ambari-server/src/main/java/org/apache/ambari/server/state/cluster/ClusterImpl.java