Reverting my accidental revert of MAPREDUCE-5059 in the previous commit of YARN-500 from branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1468743 13f79535-47bb-0310-9956-ffa450edef68

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/src/main/java/org/apache/hadoop/mapreduce/v2/hs/webapp/dao/JobInfo.java

@@ -287,7 +287,7 @@ public class JobInfo {
             avgShuffleTime += (attempt.getShuffleFinishTime() - attempt
                 .getLaunchTime());
             avgMergeTime += attempt.getSortFinishTime()
-                - attempt.getLaunchTime();
+                - attempt.getShuffleFinishTime();
             avgReduceTime += (attempt.getFinishTime() - attempt
                 .getShuffleFinishTime());
           }

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/src/test/java/org/apache/hadoop/mapreduce/v2/hs/TestJobHistoryEntities.java

@@ -94,11 +94,11 @@ public class TestJobHistoryEntities {
     assertEquals(1, completedJob.getAMInfos().size());
     assertEquals(10, completedJob.getCompletedMaps());
     assertEquals(1, completedJob.getCompletedReduces());
-    assertEquals(11, completedJob.getTasks().size());
+    assertEquals(12, completedJob.getTasks().size());
     //Verify tasks loaded at this point.
     assertEquals(true, completedJob.tasksLoaded.get());
     assertEquals(10, completedJob.getTasks(TaskType.MAP).size());
-    assertEquals(1, completedJob.getTasks(TaskType.REDUCE).size());
+    assertEquals(2, completedJob.getTasks(TaskType.REDUCE).size());
     assertEquals("user", completedJob.getUserName());
     assertEquals(JobState.SUCCEEDED, completedJob.getState());
     JobReport jobReport = completedJob.getReport();
@@ -119,7 +119,7 @@ public class TestJobHistoryEntities {
     Map<TaskId, Task> mapTasks = completedJob.getTasks(TaskType.MAP);
     Map<TaskId, Task> reduceTasks = completedJob.getTasks(TaskType.REDUCE);
     assertEquals(10, mapTasks.size());
-    assertEquals(1, reduceTasks.size());
+    assertEquals(2, reduceTasks.size());
     
     Task mt1 = mapTasks.get(mt1Id);
     assertEquals(1, mt1.getAttempts().size());
@@ -196,12 +196,12 @@ public class TestJobHistoryEntities {
     assertEquals("default",completedJob.getQueueName());
     // progress
     assertEquals(1.0, completedJob.getProgress(),0.001);
-    // 11 rows in answer
-    assertEquals(11,completedJob.getTaskAttemptCompletionEvents(0,1000).length);
+    // 12 rows in answer
+    assertEquals(12,completedJob.getTaskAttemptCompletionEvents(0,1000).length);
     // select first 10 rows
     assertEquals(10,completedJob.getTaskAttemptCompletionEvents(0,10).length);
     // select 5-10 rows include 5th
-    assertEquals(6,completedJob.getTaskAttemptCompletionEvents(5,10).length);
+    assertEquals(7,completedJob.getTaskAttemptCompletionEvents(5,10).length);
 
     // without errors
     assertEquals(1,completedJob.getDiagnostics().size());