protected void showHcatDeletedUserMessage() {
    AmbariManagementController ambariManagementController = injector.getInstance(AmbariManagementController.class);
    Clusters clusters = ambariManagementController.getClusters();
    if (clusters != null) {
      Map<String, Cluster> clusterMap = getCheckedClusterMap(clusters);
      for (final Cluster cluster : clusterMap.values()) {
        Config hiveEnvConfig = cluster.getDesiredConfigByType("hive-env");
        if (hiveEnvConfig != null) {
          Map<String, String> hiveEnvProperties = hiveEnvConfig.getProperties();
          String webhcatUser = hiveEnvProperties.get("webhcat_user");
          String hcatUser = hiveEnvProperties.get("hcat_user");
          if (!StringUtils.equals(webhcatUser, hcatUser)) {
            System.out.print("WARNING: In hive-env config, webhcat and hcat user are different. In current ambari release (3.0.0), hcat user was removed from stack, so potentially you could have some problems.");
            LOG.warn("In hive-env config, webhcat and hcat user are different. In current ambari release (3.0.0), hcat user was removed from stack, so potentially you could have some problems.");
          }
        }
      }
    }

  }
Updates the Hive/WebHCat Kerberos descriptor stored in the user-supplied Kerberos Descriptor.
<p>
Any updates will be performed on the supplied Kerberos Descriptor.
<p>
The following changes may be made:
<ul>
<li>some command json elements were modified from ..._host to ..._hosts, kerberos related properties must be adjusted accordingly</li>
</ul>

@param kerberosDescriptor the user-supplied Kerberos descriptor used to perform the in-place update
@return <code>true</code> if changes were made; otherwise <code>false</code>
ambari-server/src/main/java/org/apache/ambari/server/upgrade/UpgradeCatalog270.java