YARN-3888. ApplicationMaster link is broken in RM WebUI when appstate is

NEW. Contributed by Bibin A Chundatt

hadoop-yarn-project/CHANGES.txt

@@ -607,6 +607,9 @@ Release 2.8.0 - UNRELEASED
     YARN-3892. Fixed NPE on RMStateStore#serviceStop when
     CapacityScheduler#serviceInit fails. (Bibin A Chundatt via jianhe)
 
+    YARN-3888. ApplicationMaster link is broken in RM WebUI when appstate is NEW.
+    (Bibin A Chundatt via xgong)
+
 Release 2.7.2 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/RMAppsBlock.java

@@ -131,13 +131,15 @@ public class RMAppsBlock extends AppsBlock {
 
       String trackingURL =
           app.getTrackingUrl() == null
-              || app.getTrackingUrl().equals(UNAVAILABLE) ? null : app
-            .getTrackingUrl();
+              || app.getTrackingUrl().equals(UNAVAILABLE)
+              || app.getAppState() == YarnApplicationState.NEW ? null : app
+              .getTrackingUrl();
 
       String trackingUI =
           app.getTrackingUrl() == null
-              || app.getTrackingUrl().equals(UNAVAILABLE) ? "Unassigned" : app
-            .getAppState() == YarnApplicationState.FINISHED
+              || app.getTrackingUrl().equals(UNAVAILABLE)
+              || app.getAppState() == YarnApplicationState.NEW ? "Unassigned"
+              : app.getAppState() == YarnApplicationState.FINISHED
               || app.getAppState() == YarnApplicationState.FAILED
               || app.getAppState() == YarnApplicationState.KILLED ? "History"
               : "ApplicationMaster";