YARN-4392. ApplicationCreatedEvent event time resets after RM

restart/failover. Contributed by Naganarasimha G R and Xuan Gong

(cherry picked from commit 4546c7582b6762c18ba150d80a8976eb51a8290c)

Conflicts:
	hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/RMAppImpl.java
	hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/TestRMAppTransitions.java

hadoop-yarn-project/CHANGES.txt

@@ -1471,6 +1471,9 @@ Release 2.8.0 - UNRELEASED
     YARN-4565. Fix a bug that leads to AM resource limit not hornored when
     sizeBasedWeight enabled for FairOrderingPolicy. (wtan via jianhe)
 
+    YARN-4392. ApplicationCreatedEvent event time resets after RM restart/failover.
+    (Naganarasimha G R and Xuan Gong via xgong)
+
 Release 2.7.3 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/RMAppImpl.java

@@ -896,6 +896,9 @@ public class RMAppImpl implements RMApp, Recoverable {
     //TODO recover collector address.
     //this.collectorAddr = appState.getCollectorAddr();
 
+    // send the ATS create Event
+    sendATSCreateEvent(this, this.startTime);
+
     for(int i=0; i<appState.getAttemptCount(); ++i) {
       // create attempt
       createNewAttempt();
@@ -1838,16 +1841,20 @@ public class RMAppImpl implements RMApp, Recoverable {
     }
     return amNodeLabelExpression;
   }
+<<<<<<< 93f2f13bc1c25fa441a3819c98b7073fca45b07a
   
   @Override
   public CallerContext getCallerContext() {
     return callerContext;
   }
+=======
+>>>>>>> YARN-4392. ApplicationCreatedEvent event time resets after RM
 
   private void sendATSCreateEvent(RMApp app, long startTime) {
     rmContext.getRMApplicationHistoryWriter().applicationStarted(app);
     rmContext.getSystemMetricsPublisher().appCreated(app, startTime);
   }
+<<<<<<< 93f2f13bc1c25fa441a3819c98b7073fca45b07a
 
   @VisibleForTesting
   public boolean isAmBlacklistingEnabled() {
@@ -1858,4 +1865,6 @@ public class RMAppImpl implements RMApp, Recoverable {
   public float getAmBlacklistingDisableThreshold() {
     return blacklistDisableThreshold;
   }
+=======
+>>>>>>> YARN-4392. ApplicationCreatedEvent event time resets after RM
 }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/TestRMAppTransitions.java

@@ -18,8 +18,6 @@
 
 package org.apache.hadoop.yarn.server.resourcemanager.rmapp;
 
-import org.apache.hadoop.yarn.server.resourcemanager.recovery.records.ApplicationStateData;
-
 import static org.mockito.Matchers.any;
 import static org.mockito.Matchers.anyLong;
 import static org.mockito.Mockito.doReturn;