YARN-8594. [UI2] Display current logged in user. Contributed by Akhil PB.

(cherry picked from commit 1ea81169bad5bd6433348ef8e5e7ac12c5a9cb5e)

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-ui/src/main/webapp/app/adapters/cluster-user-info.js

@@ -0,0 +1,29 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import RESTAbstractAdapter from './restabstract';
+
+export default RESTAbstractAdapter.extend({
+  address: "rmWebAddress",
+  restNameSpace: "cluster",
+  serverName: "RM",
+
+  pathForType(/*modelName*/) {
+    return 'userinfo';
+  }
+});

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-ui/src/main/webapp/app/controllers/application.js

@@ -58,5 +58,13 @@ export default Ember.Controller.extend({
       return true;
     }
     return false;
-  }.property('currentPath')
+  }.property('currentPath'),
+
+  clusterInfo: function() {
+    return this.model.clusterInfo.get('firstObject');
+  }.property('model.clusterInfo'),
+
+  userInfo: function() {
+    return this.model.userInfo.get('firstObject');
+  }.property('model.userInfo'),
 });

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-ui/src/main/webapp/app/models/cluster-user-info.js

@@ -0,0 +1,24 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import DS from 'ember-data';
+
+export default DS.Model.extend({
+    rmLoginUser: DS.attr('string'),
+    requestedUser: DS.attr('string')
+});

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-ui/src/main/webapp/app/routes/application.js

@@ -21,7 +21,10 @@ import AbstractRoute from './abstract';
 
 export default AbstractRoute.extend({
   model() {
-    return this.store.findAll('ClusterInfo', {reload: true});
+    return Ember.RSVP.hash({
+      clusterInfo: this.store.findAll('ClusterInfo', {reload: true}),
+      userInfo: this.store.findAll('cluster-user-info', {reload: true})
+    });
   },
 
   actions: {
@@ -46,5 +49,6 @@ export default AbstractRoute.extend({
 
   unloadAll: function() {
     this.store.unloadAll('ClusterInfo');
+    this.store.unloadAll('cluster-user-info');
   },
 });

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-ui/src/main/webapp/app/serializers/cluster-user-info.js

@@ -0,0 +1,43 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import DS from 'ember-data';
+
+export default DS.JSONAPISerializer.extend({
+  normalizeSingleResponse(store, primaryModelClass, payload, id,
+    requestType) {
+    var fixedPayload = {
+      id: id,
+      type: primaryModelClass.modelName,
+      attributes: payload
+    };
+
+    return this._super(store, primaryModelClass, fixedPayload, id, requestType);
+  },
+
+  normalizeArrayResponse(store, primaryModelClass, payload, id,
+    requestType) {
+    // return expected is { data: [ {}, {} ] }
+    var normalizedArrayResponse = {};
+
+    normalizedArrayResponse.data = [
+      this.normalizeSingleResponse(store, primaryModelClass, payload, Date.now(), requestType)
+    ];
+    return normalizedArrayResponse;
+  }
+});

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-ui/src/main/webapp/app/styles/app.scss

@@ -472,7 +472,8 @@ div.attempt-info-panel table > tbody > tr > td:last-of-type {
 }
 .yarn-cluster-info {
   display: flex;
-  margin-left: auto
+  margin-left: auto;
+  margin-top: -7px;
 }
 
 .yarn-ui-footer {
@@ -729,6 +730,15 @@ div.service-action-mask img {
   overflow: scroll;
 }
 
+div.loggedin-user {
+  float: right;
+  padding: 15px 5px;
+  color: #555;
+  .username {
+    font-weight: bold;
+  }
+}
+
 .diagnostic-info {
   pre {
     margin-bottom: 0;

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-ui/src/main/webapp/app/templates/application.hbs

@@ -72,6 +72,11 @@
             {{/link-to}}
           {{/link-to}}
         </ul>
+        {{#if userInfo}}
+        <div class="loggedin-user">
+          Logged in as: <span class="username">{{userInfo.requestedUser}}</span>
+        </div>
+        {{/if}}
       </div><!-- /.navbar-collapse -->
     </div><!-- /.container-fluid -->
   </nav>
@@ -97,13 +102,15 @@
     </div>
   </div>
   <div class="yarn-cluster-info">
+    {{#if clusterInfo}}
     <div>
-      <strong>v{{model.firstObject.hadoopVersion}}</strong>
-      <span class="yarn-cluster-status yarn-tooltip" title="Hadoop Version: {{model.firstObject.getYARNBuildHash}} &#10;Started on: {{date-formatter model.firstObject.startedOn}}" data-toggle="tooltip" data-placement="top">
-        <i class={{lower model.firstObject.state}} />
+      <strong>v{{clusterInfo.hadoopVersion}}</strong>
+      <span class="yarn-cluster-status yarn-tooltip" title="Hadoop Version: {{clusterInfo.getYARNBuildHash}} &#10;Started on: {{date-formatter clusterInfo.startedOn}}" data-toggle="tooltip" data-placement="top">
+        <i class={{lower clusterInfo.state}} />
       </span>
-      <div>Started at {{date-formatter model.firstObject.startedOn}}</div>
+      <div>Started at {{date-formatter clusterInfo.startedOn}}</div>
     </div>
+    {{/if}}
   </div>
 </div>