YARN-4546. ResourceManager crash due to scheduling opportunity overflow. Contributed by Jason Lowe.

(cherry picked from commit c1462a67ff7bb632df50e1c52de971cced56c6a3)
(cherry picked from commit 1cc001db4c3767072b5d065d161bc5c6d1c480d4)

Conflicts:

	hadoop-yarn-project/CHANGES.txt
	hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/TestSchedulerApplicationAttempt.java

hadoop-yarn-project/CHANGES.txt

@@ -50,6 +50,9 @@ Release 2.7.3 - UNRELEASED
 
     YARN-4452. NPE when submit Unmanaged application. (Naganarasimha G R
     via junping_du)
+    
+    YARN-4546. ResourceManager crash due to scheduling opportunity overflow.
+    (Jason Lowe via junping_du)
 
 Release 2.7.2 - UNRELEASED
 

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/SchedulerApplicationAttempt.java

@@ -57,6 +57,7 @@ import org.apache.hadoop.yarn.server.resourcemanager.rmcontainer.RMContainerStat
 import org.apache.hadoop.yarn.server.resourcemanager.rmnode.RMNodeCleanContainerEvent;
 import org.apache.hadoop.yarn.util.resource.Resources;
 
+import com.google.common.annotations.VisibleForTesting;
 import com.google.common.base.Preconditions;
 import com.google.common.collect.HashMultiset;
 import com.google.common.collect.Multiset;
@@ -488,8 +489,10 @@ public class SchedulerApplicationAttempt {
   }
 
   public synchronized void addSchedulingOpportunity(Priority priority) {
-    schedulingOpportunities.setCount(priority,
-        schedulingOpportunities.count(priority) + 1);
+    int count = schedulingOpportunities.count(priority);
+    if (count < Integer.MAX_VALUE) {
+      schedulingOpportunities.setCount(priority, count + 1);
+    }
   }
   
   public synchronized void subtractSchedulingOpportunity(Priority priority) {
@@ -523,6 +526,11 @@ public class SchedulerApplicationAttempt {
     schedulingOpportunities.setCount(priority, 0);
   }
 
+  @VisibleForTesting
+  void setSchedulingOpportunities(Priority priority, int count) {
+    schedulingOpportunities.setCount(priority, count);
+  }
+
   synchronized AggregateAppResourceUsage getRunningAggregateAppResourceUsage() {
     long currentTimeMillis = System.currentTimeMillis();
     // Don't walk the whole container list if the resources were computed

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/TestSchedulerApplicationAttempt.java

@@ -163,4 +163,26 @@ public class TestSchedulerApplicationAttempt {
         ApplicationAttemptId.newInstance(appIdImpl, attemptId);
     return attId;
   }
+
+  @Test
+  public void testSchedulingOpportunityOverflow() throws Exception {
+    ApplicationAttemptId attemptId = createAppAttemptId(0, 0);
+    Queue queue = createQueue("test", null);
+    RMContext rmContext = mock(RMContext.class);
+    when(rmContext.getEpoch()).thenReturn(3L);
+    SchedulerApplicationAttempt app = new SchedulerApplicationAttempt(
+        attemptId, "user", queue, queue.getActiveUsersManager(), rmContext);
+    Priority priority = Priority.newInstance(1);
+    assertEquals(0, app.getSchedulingOpportunities(priority));
+    app.addSchedulingOpportunity(priority);
+    assertEquals(1, app.getSchedulingOpportunities(priority));
+    // verify the count is capped at MAX_VALUE and does not overflow
+    app.setSchedulingOpportunities(priority, Integer.MAX_VALUE - 1);
+    assertEquals(Integer.MAX_VALUE - 1,
+        app.getSchedulingOpportunities(priority));
+    app.addSchedulingOpportunity(priority);
+    assertEquals(Integer.MAX_VALUE, app.getSchedulingOpportunities(priority));
+    app.addSchedulingOpportunity(priority);
+    assertEquals(Integer.MAX_VALUE, app.getSchedulingOpportunities(priority));
+  }
 }