MAPREDUCE-7064. Flaky test TestTaskAttempt#testReducerCustomResourceTypes. Contributed by Peter Bacsko

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/test/java/org/apache/hadoop/mapreduce/v2/app/job/impl/TestTaskAttempt.java

@@ -187,77 +187,103 @@ public class TestTaskAttempt{
 
   @Test
   public void testMRAppHistoryForMap() throws Exception {
-    MRApp app = new FailingAttemptsMRApp(1, 0);
+    MRApp app = null;
+    try {
+      app = new FailingAttemptsMRApp(1, 0);
       testMRAppHistory(app);
+    } finally {
+      app.close();
+    }
   }
 
   @Test
   public void testMRAppHistoryForReduce() throws Exception {
-    MRApp app = new FailingAttemptsMRApp(0, 1);
+    MRApp app = null;
+    try {
+      app = new FailingAttemptsMRApp(0, 1);
       testMRAppHistory(app);
+    } finally {
+      app.close();
+    }
   }
 
   @Test
   public void testMRAppHistoryForTAFailedInAssigned() throws Exception {
     // test TA_CONTAINER_LAUNCH_FAILED for map
-    FailingAttemptsDuringAssignedMRApp app =
+    FailingAttemptsDuringAssignedMRApp app = null;
+
+    try {
+      app =
           new FailingAttemptsDuringAssignedMRApp(1, 0,
               TaskAttemptEventType.TA_CONTAINER_LAUNCH_FAILED);
       testTaskAttemptAssignedFailHistory(app);
+      app.close();
 
       // test TA_CONTAINER_LAUNCH_FAILED for reduce
       app =
           new FailingAttemptsDuringAssignedMRApp(0, 1,
               TaskAttemptEventType.TA_CONTAINER_LAUNCH_FAILED);
       testTaskAttemptAssignedFailHistory(app);
+      app.close();
 
       // test TA_CONTAINER_COMPLETED for map
       app =
           new FailingAttemptsDuringAssignedMRApp(1, 0,
               TaskAttemptEventType.TA_CONTAINER_COMPLETED);
       testTaskAttemptAssignedFailHistory(app);
+      app.close();
 
       // test TA_CONTAINER_COMPLETED for reduce
       app =
           new FailingAttemptsDuringAssignedMRApp(0, 1,
               TaskAttemptEventType.TA_CONTAINER_COMPLETED);
       testTaskAttemptAssignedFailHistory(app);
+      app.close();
 
       // test TA_FAILMSG for map
       app =
           new FailingAttemptsDuringAssignedMRApp(1, 0,
               TaskAttemptEventType.TA_FAILMSG);
       testTaskAttemptAssignedFailHistory(app);
+      app.close();
 
       // test TA_FAILMSG for reduce
       app =
           new FailingAttemptsDuringAssignedMRApp(0, 1,
               TaskAttemptEventType.TA_FAILMSG);
       testTaskAttemptAssignedFailHistory(app);
+      app.close();
 
       // test TA_FAILMSG_BY_CLIENT for map
       app =
           new FailingAttemptsDuringAssignedMRApp(1, 0,
               TaskAttemptEventType.TA_FAILMSG_BY_CLIENT);
       testTaskAttemptAssignedFailHistory(app);
+      app.close();
 
       // test TA_FAILMSG_BY_CLIENT for reduce
       app =
           new FailingAttemptsDuringAssignedMRApp(0, 1,
               TaskAttemptEventType.TA_FAILMSG_BY_CLIENT);
       testTaskAttemptAssignedFailHistory(app);
+      app.close();
 
       // test TA_KILL for map
       app =
           new FailingAttemptsDuringAssignedMRApp(1, 0,
               TaskAttemptEventType.TA_KILL);
       testTaskAttemptAssignedKilledHistory(app);
+      app.close();
 
       // test TA_KILL for reduce
       app =
           new FailingAttemptsDuringAssignedMRApp(0, 1,
               TaskAttemptEventType.TA_KILL);
       testTaskAttemptAssignedKilledHistory(app);
+      app.close();
+    } finally {
+      app.close();
+    }
   }
 
   @Test