Github user kkhatua commented on a diff in the pull request:

    https://github.com/apache/drill/pull/1203#discussion_r180248133
  
    --- Diff: exec/java-exec/src/main/resources/rest/index.ftl ---
    @@ -289,14 +314,94 @@
                       });
                   }
               }
    -      </#if>
    +
    +          function remoteShutdown(button,host) {
    +              var url = location.protocol + "//" + host + 
"/gracefulShutdown";
    +              var result = $.ajax({
    +                    type: 'POST',
    +                    url: url,
    +                    contentType : 'text/plain',
    +                    complete: function(data) {
    +                        alert(data.responseJSON["response"]);
    +                        button.prop('disabled',true).css('opacity',0.5);
    +                    }
    +              });
    +          }
    +          </#if>
           function getRequestUrl(requestPath) {
                 var protocol = location.protocol;
                 var host = location.host;
                 var url = protocol + "//" + host + requestPath;
                 return url;
           }
    -    </script>
    +
    +      //Iterates through all the nodes for update
    +      function reloadMetrics() {
    +          for (i = 1; i <= size; i++) {
    +              var address = 
$("#row-"+i).find("#address").contents().get(0).nodeValue.trim();
    +              var httpPort = 
$("#row-"+i).find("#httpPort").contents().get(0).nodeValue.trim();
    +              updateMetricsHtml(address, httpPort, i);
    +          }
    +      }
    +
    +      //Update memory
    +      //TODO: HTTPS?
    +      function updateMetricsHtml(drillbit,webport,idx) {
    +        var result = $.ajax({
    +          type: 'GET',
    --- End diff --
    
    Makes sense. I'll set the default values to Unknown rather than zero. 


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