YARN-7728. Expose container preemptions related information in Capacity Scheduler queue metrics. Contributed by Eric Payne.

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

@@ -68,6 +68,10 @@ public class QueueMetrics implements MetricsSource {
     MutableCounterLong aggregateOffSwitchContainersAllocated;
   @Metric("Aggregate # of preempted containers") MutableCounterLong
       aggregateContainersPreempted;
+  @Metric("Aggregate # of preempted memory seconds") MutableCounterLong
+      aggregateMemoryMBSecondsPreempted;
+  @Metric("Aggregate # of preempted vcore seconds") MutableCounterLong
+      aggregateVcoreSecondsPreempted;
   @Metric("# of active users") MutableGaugeInt activeUsers;
   @Metric("# of active applications") MutableGaugeInt activeApplications;
   @Metric("App Attempt First Container Allocation Delay")
@@ -534,6 +538,20 @@ public class QueueMetrics implements MetricsSource {
     }
   }
 
+  public void updatePreemptedMemoryMBSeconds(long mbSeconds) {
+    aggregateMemoryMBSecondsPreempted.incr(mbSeconds);
+    if (parent != null) {
+      parent.updatePreemptedMemoryMBSeconds(mbSeconds);
+    }
+  }
+
+  public void updatePreemptedVcoreSeconds(long vcoreSeconds) {
+    aggregateVcoreSecondsPreempted.incr(vcoreSeconds);
+    if (parent != null) {
+      parent.updatePreemptedVcoreSeconds(vcoreSeconds);
+    }
+  }
+
   public void reserveResource(String partition, String user, Resource res) {
     if(partition == null || partition.equals(RMNodeLabelsManager.NO_LABEL)) {
       reserveResource(user, res);

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

@@ -34,6 +34,7 @@ import java.util.concurrent.LinkedBlockingQueue;
 import java.util.concurrent.atomic.AtomicBoolean;
 
 import org.apache.commons.lang.StringUtils;
+import org.apache.commons.lang.time.DateUtils;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.classification.InterfaceAudience.LimitedPrivate;
@@ -46,6 +47,7 @@ import org.apache.hadoop.util.Time;
 import org.apache.hadoop.yarn.api.records.ApplicationAttemptId;
 import org.apache.hadoop.yarn.api.records.ApplicationId;
 import org.apache.hadoop.yarn.api.records.Container;
+import org.apache.hadoop.yarn.api.records.ContainerExitStatus;
 import org.apache.hadoop.yarn.api.records.ContainerId;
 import org.apache.hadoop.yarn.api.records.ContainerStatus;
 import org.apache.hadoop.yarn.api.records.NodeId;
@@ -1821,6 +1823,23 @@ public class CapacityScheduler extends
     LeafQueue queue = (LeafQueue) application.getQueue();
     queue.completedContainer(getClusterResource(), application, node,
         rmContainer, containerStatus, event, null, true);
+    if (ContainerExitStatus.PREEMPTED == containerStatus.getExitStatus()) {
+      updateQueuePreemptionMetrics(queue, rmContainer);
+    }
+  }
+
+  private void updateQueuePreemptionMetrics(
+      CSQueue queue, RMContainer rmc) {
+    QueueMetrics qMetrics = queue.getMetrics();
+    long usedMillis = rmc.getFinishTime() - rmc.getCreationTime();
+    Resource containerResource = rmc.getAllocatedResource();
+    qMetrics.preemptContainer();
+    long mbSeconds = (containerResource.getMemorySize() * usedMillis)
+        / DateUtils.MILLIS_PER_SECOND;
+    long vcSeconds = (containerResource.getVirtualCores() * usedMillis)
+        / DateUtils.MILLIS_PER_SECOND;
+    qMetrics.updatePreemptedMemoryMBSeconds(mbSeconds);
+    qMetrics.updatePreemptedVcoreSeconds(vcSeconds);
   }
 
   @Lock(Lock.NoLock.class)

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

@@ -171,6 +171,10 @@ public class TestCapacitySchedulerSurgicalPreemption
     waitNumberOfLiveContainersOnNodeFromApp(cs.getNode(rmNode2.getNodeID()),
         am1.getApplicationAttemptId(), 16);
 
+    // Ensure preemption metrics were recored.
+    Assert.assertEquals("Number of preempted containers incorrectly recorded:",
+        4, cs.getQueue("root").getMetrics().getAggregatePreemptedContainers());
+
     rm1.close();
   }