@Override
  public boolean equals(Object o) {
    if (this == o) return true;
    if (o == null || getClass() != o.getClass()) return false;

    HostUpdateEvent that = (HostUpdateEvent) o;

    if (clusterName != null ? !clusterName.equals(that.clusterName) : that.clusterName != null) return false;
    if (hostName != null ? !hostName.equals(that.hostName) : that.hostName != null) return false;
    if (hostStatus != null ? !hostStatus.equals(that.hostStatus) : that.hostStatus != null) return false;
    if (hostState != that.hostState) return false;
    if (lastHeartbeatTime != null ? !lastHeartbeatTime.equals(that.lastHeartbeatTime) : that.lastHeartbeatTime != null)
      return false;
    if (maintenanceState != that.maintenanceState) return false;
    return alertsSummary != null ? alertsSummary.equals(that.alertsSummary) : that.alertsSummary == null;
  }
Host info with updated parameter. This update will be sent to all subscribed recipients.
ambari-server/src/main/java/org/apache/ambari/server/events/HostUpdateEvent.java