YARN-2509. Enable Cross Origin Filter for timeline server only and not all Yarn servers (Mit Desai via jeagles)

(cherry picked from commit 91d45f0f01)

hadoop-yarn-project/CHANGES.txt

@@ -152,6 +152,9 @@ Release 2.6.0 - UNRELEASED
     YARN-1506. Changed RMNode/SchedulerNode to update resource with event
     notification. (Junping Du via jianhe)
 
+    YARN-2509. Enable Cross Origin Filter for timeline server only and not all
+    Yarn servers (Mit Desai via jeagles)
+
   OPTIMIZATIONS
 
   BUG FIXES

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/conf/YarnConfiguration.java

@@ -1239,6 +1239,14 @@ public class YarnConfiguration extends Configuration {
   public static final String TIMELINE_SERVICE_KEYTAB =
       TIMELINE_SERVICE_PREFIX + "keytab";
 
+  /** Enables cross origin support for timeline server.*/
+  public static final String TIMELINE_SERVICE_HTTP_CROSS_ORIGIN_ENABLED =
+      TIMELINE_SERVICE_PREFIX + "http-cross-origin.enabled";
+
+  /** Default value for cross origin support for timeline server.*/
+  public static final boolean
+      TIMELINE_SERVICE_HTTP_CROSS_ORIGIN_ENABLED_DEFAULT = false;
+
   ////////////////////////////////
   // Other Configs
   ////////////////////////////////

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-applicationhistoryservice/src/main/java/org/apache/hadoop/yarn/server/applicationhistoryservice/ApplicationHistoryServer.java

@@ -46,6 +46,7 @@ import org.apache.hadoop.yarn.server.timeline.TimelineStore;
 import org.apache.hadoop.yarn.server.timeline.security.TimelineACLsManager;
 import org.apache.hadoop.yarn.server.timeline.security.TimelineAuthenticationFilterInitializer;
 import org.apache.hadoop.yarn.server.timeline.security.TimelineDelegationTokenSecretManagerService;
+import org.apache.hadoop.yarn.server.timeline.webapp.CrossOriginFilterInitializer;
 import org.apache.hadoop.yarn.webapp.WebApp;
 import org.apache.hadoop.yarn.webapp.WebApps;
 import org.apache.hadoop.yarn.webapp.util.WebAppUtils;
@@ -197,17 +198,27 @@ public class ApplicationHistoryServer extends CompositeService {
     // the customized filter will be loaded by the timeline server to do Kerberos
     // + DT authentication.
     String initializers = conf.get("hadoop.http.filter.initializers");
-    boolean modifiedInitialiers = false;
+    boolean modifiedInitializers = false;
 
     initializers =
         initializers == null || initializers.length() == 0 ? "" : initializers;
 
+    if (!initializers.contains(CrossOriginFilterInitializer.class.getName())) {
+      if(conf.getBoolean(YarnConfiguration
+          .TIMELINE_SERVICE_HTTP_CROSS_ORIGIN_ENABLED, YarnConfiguration
+              .TIMELINE_SERVICE_HTTP_CROSS_ORIGIN_ENABLED_DEFAULT)) {
+        initializers = CrossOriginFilterInitializer.class.getName() + ","
+            + initializers;
+        modifiedInitializers = true;
+      }
+    }
+
     if (!initializers.contains(TimelineAuthenticationFilterInitializer.class
       .getName())) {
       initializers =
           TimelineAuthenticationFilterInitializer.class.getName() + ","
               + initializers;
-      modifiedInitialiers = true;
+      modifiedInitializers = true;
     }
 
     String[] parts = initializers.split(",");
@@ -216,14 +227,14 @@ public class ApplicationHistoryServer extends CompositeService {
       filterInitializer = filterInitializer.trim();
       if (filterInitializer.equals(AuthenticationFilterInitializer.class
         .getName())) {
-        modifiedInitialiers = true;
+        modifiedInitializers = true;
         continue;
       }
       target.add(filterInitializer);
     }
     String actualInitializers =
         org.apache.commons.lang.StringUtils.join(target, ",");
-    if (modifiedInitialiers) {
+    if (modifiedInitializers) {
       conf.set("hadoop.http.filter.initializers", actualInitializers);
     }
     String bindAddress = WebAppUtils.getWebAppBindURL(conf,