@Override
  public String toString() {
    return "RequestOperationLevel{" +
            "level=" + level +
            ", clusterName='" + clusterName + '\'' +
            ", serviceName='" + serviceName + '\'' +
            ", hostComponentName='" + hostComponentName + '\'' +
            ", hostName='" + hostName + '\'' +
            '}';
  }
Source host for request. Specified for Host-level and
HostComponent-level requests.
ambari-server/src/main/java/org/apache/ambari/server/controller/internal/RequestOperationLevel.java