MAPREDUCE-2987. Fixed display of logged user on RM Web-UI. Contributed by Thomas Graves.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1171901 13f79535-47bb-0310-9956-ffa450edef68

hadoop-mapreduce-project/CHANGES.txt

@@ -1336,6 +1336,9 @@ Release 0.23.0 - Unreleased
     MAPREDUCE-3007. Fixed Yarn Mapreduce client to be able to connect to 
     JobHistoryServer in secure mode. (vinodkv)
 
+    MAPREDUCE-2987. Fixed display of logged user on RM Web-UI. (Thomas Graves
+    via acmurthy)
+
 Release 0.22.0 - Unreleased
 
   INCOMPATIBLE CHANGES

hadoop-mapreduce-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/webapp/view/HeaderBlock.java

@@ -23,10 +23,14 @@ import static org.apache.hadoop.yarn.webapp.Params.*;
 public class HeaderBlock extends HtmlBlock {
 
   @Override protected void render(Block html) {
+    String loggedIn = ""; 
+    if (request().getRemoteUser() != null) {
+      loggedIn = "Logged in as: " + request().getRemoteUser();
+    }
     html.
       div("#header.ui-widget").
         div("#user").
-          _("Logged in as: "+ request().getRemoteUser())._().
+          _(loggedIn)._().
         div("#logo").
           img("/static/hadoop-st.png")._().
         h1($(TITLE))._();