AMBARI-2454. Inability to retrieve flume metrics on cluster without flume breaks web-ui. (srimanth)

git-svn-id: https://svn.apache.org/repos/asf/incubator/ambari/trunk@1495241 13f79535-47bb-0310-9956-ffa450edef68

ambari-web/app/controllers/global/update_controller.js

@@ -78,10 +78,17 @@ App.UpdateController = Em.Controller.extend({
   updateServiceMetric: function (callback, isInitialLoad) {
     var self = this;
     self.set('isUpdated', false);
+    
+    var conditionalFields = [];
+    if (App.Service.find().findProperty('serviceName', 'FLUME')) {
+      conditionalFields.push("components/host_components/metrics/flume/flume");
+    }
+    var conditionalFieldsString = conditionalFields.length > 0 ? ',' + conditionalFields.join(',') : '';
+    
     var servicesUrl = isInitialLoad ? 
       //this.getUrl('/data/dashboard/services.json', '/services?fields=components/ServiceComponentInfo,components/host_components,components/host_components/HostRoles') :
-      this.getUrl('/data/dashboard/services.json', '/services?fields=components/ServiceComponentInfo,components/host_components,components/host_components/HostRoles,components/host_components/metrics/jvm/memHeapUsedM,components/host_components/metrics/jvm/memHeapCommittedM,components/host_components/metrics/mapred/jobtracker/trackers_decommissioned,components/host_components/metrics/cpu/cpu_wio,components/host_components/metrics/rpc/RpcQueueTime_avg_time,components/host_components/metrics/flume/flume'):
-      this.getUrl('/data/dashboard/services.json', '/services?fields=components/ServiceComponentInfo,components/host_components,components/host_components/HostRoles,components/host_components/metrics/jvm/memHeapUsedM,components/host_components/metrics/jvm/memHeapCommittedM,components/host_components/metrics/mapred/jobtracker/trackers_decommissioned,components/host_components/metrics/cpu/cpu_wio,components/host_components/metrics/rpc/RpcQueueTime_avg_time,components/host_components/metrics/flume/flume');
+      this.getUrl('/data/dashboard/services.json', '/services?fields=components/ServiceComponentInfo,components/host_components,components/host_components/HostRoles,components/host_components/metrics/jvm/memHeapUsedM,components/host_components/metrics/jvm/memHeapCommittedM,components/host_components/metrics/mapred/jobtracker/trackers_decommissioned,components/host_components/metrics/cpu/cpu_wio,components/host_components/metrics/rpc/RpcQueueTime_avg_time'+conditionalFieldsString):
+      this.getUrl('/data/dashboard/services.json', '/services?fields=components/ServiceComponentInfo,components/host_components,components/host_components/HostRoles,components/host_components/metrics/jvm/memHeapUsedM,components/host_components/metrics/jvm/memHeapCommittedM,components/host_components/metrics/mapred/jobtracker/trackers_decommissioned,components/host_components/metrics/cpu/cpu_wio,components/host_components/metrics/rpc/RpcQueueTime_avg_time'+conditionalFieldsString);
     var callback = callback || function (jqXHR, textStatus) {
       self.set('isUpdated', true);
     };