anchor.diff:    </div>
   </div>
   
  +<%if (quotaManager != null) {%>
  +
   <div class="container-fluid content">
     <div class="row">
       <div class="page-header">
         <h2>Rpc Throttle Enabled</h2>
       </div>
     </div>
  -  <%if (master.getMasterQuotaManager().isRpcThrottleEnabled()) {%>
  +  <%if (quotaManager.isRpcThrottleEnabled()) {%>
     <div class="alert alert-success">
       Rpc throttle is enabled.
     </div>
  
positive.code:   import="java.util.List"
    import="org.apache.hadoop.conf.Configuration"
    import="org.apache.hadoop.hbase.master.HMaster"
    import="org.apache.hadoop.hbase.quotas.QuotaRetriever"
    import="org.apache.hadoop.hbase.quotas.QuotaSettings"
    import="org.apache.hadoop.hbase.quotas.ThrottleSettings"
  
negative.code:   HMaster master = (HMaster) getServletContext().getAttribute(HMaster.MASTER);
    Configuration conf = master.getConfiguration();
    pageContext.setAttribute("pageTitle", "HBase Master Quotas: " + master.getServerName());
    List<ThrottleSettings> regionServerThrottles = new ArrayList<>();
    List<ThrottleSettings> namespaceThrottles = new ArrayList<>();
    List<ThrottleSettings> userThrottles = new ArrayList<>();
    MasterQuotaManager quotaManager = master.getMasterQuotaManager();
    boolean exceedThrottleQuotaEnabled = false;
    if (quotaManager != null) {
      exceedThrottleQuotaEnabled = quotaManager.isExceedThrottleQuotaEnabled();
      try (QuotaRetriever scanner = QuotaRetriever.open(conf, null)) {
        for (QuotaSettings quota : scanner) {
          if (quota instanceof ThrottleSettings) {
            ThrottleSettings throttle = (ThrottleSettings) quota;
            if (throttle.getUserName() != null) {
              userThrottles.add(throttle);
            } else if (throttle.getNamespace() != null) {
              namespaceThrottles.add(throttle);
            } else if (throttle.getRegionServer() != null) {
              regionServerThrottles.add(throttle);
            }
          }
        }
      }
  